Inflammation is defined as the body's response to injury or infection. It can be caused by infectious agents like bacteria, viruses, and parasites, or non-infectious agents like physical trauma, chemicals, or foreign bodies. The signs of inflammation are redness, swelling, heat, pain, and loss of function. Acute inflammation involves vascular changes like increased blood flow and permeability, as well as cellular events like exudation of leukocytes and phagocytosis of microbes. The type and severity of inflammatory response depends on factors related to the infectious agent, host defenses, and type of tissue involved.
This document provides an overview of acute and chronic inflammation. It defines inflammation and outlines the main types, including acute and chronic inflammation. Acute inflammation is defined as a rapid, transient response and its stages are described as transient vasoconstriction, persistent vasodilation, increased permeability, fluid exudate formation, cellular exudate accumulation, and resolution or progression. Chronic inflammation is defined as prolonged inflammation that involves attempts at repair. Its causes include persisting infections or irritants and autoimmune reactions. The document outlines the cells involved in chronic inflammation and types of mixed acute and chronic inflammation.
Inflammation is the body's response to injury or infection and is characterized by redness, swelling, heat, pain, and loss of function. There are three main phases of inflammation - alteration, exudation, and proliferation. The type of inflammatory response depends on factors of the organism causing it and factors of the host, and can be classified as either exudative (involving fluid exudates) or proliferative (involving cell proliferation). Exudative inflammation includes serous, fibrinous, purulent, hemorrhagic, and catarrhal types defined by the character of exudates produced and their location.
Purulent inflammation, also known as suppurative inflammation, results from bacterial infection and is characterized by large amounts of pus consisting of neutrophils, dead cells, and fluid. Abscesses form when pus accumulates in enclosed tissue spaces. Examples given include suppurative appendicitis, pyelonephritis, and purulent meningitis. Suppurative appendicitis specifically involves obstruction of the appendix leading to bacterial infection, swelling, and eventual rupture and abscess formation. Pyelonephritis is a urinary tract infection of the kidneys that can cause interstitial abscesses and suppuration if severe. Purulent meningitis is an infectious inflammation of the meninges often involving the brain and
The document summarizes inflammation and its outcomes. It discusses:
1) The possible outcomes of acute inflammation are resolution, scarring (fibrosis), abscess formation, or progression to chronic inflammation.
2) Morphologic patterns of acute inflammation include non-suppurative (serous, fibrinous) and suppurative (localized like abscesses, boils, and diffuse like cellulitis) types.
3) Key cell types and processes in acute and chronic inflammation are described.
This document defines inflammation and describes its historical understanding and cardinal signs. Inflammation is defined as the host response to local injury and is fundamentally a vascular phenomenon. The four cardinal signs described by Celsus in the 1st century AD are redness, heat, swelling, and pain. Rudolf Virchow later added a fifth sign of loss of function. The document outlines the stimuli that can cause inflammation including physical, chemical, biological, and immunological factors. It describes the key cells involved in acute and chronic inflammation such as neutrophils, macrophages, lymphocytes, and plasma cells. It distinguishes between acute inflammation which has a rapid onset and involves neutrophils and chronic inflammation which has a slower onset and involves lymphocytes and macrophages.
Inflammation is the body's complex protective reaction to injury caused by various stimuli. It involves the destruction, dilution, or walling off of injurious agents. The mechanisms of inflammation include local alterations, exudation of fluid and cells, and proliferation of new tissue. Acute inflammation is characterized by classical symptoms of heat, redness, swelling, pain, and loss of function, as well as systemic responses like fever and increased white blood cell count. It involves vascular changes, cellular events like leukocyte migration, and outcomes like resolution, healing by scar tissue, or progression to chronic inflammation. Chronic inflammation is driven by lymphocytes, plasma cells, macrophages and involves distinctive patterns like granulomatous inflammation seen in tuberculosis.
The document discusses the outcomes of acute inflammation and their morphological patterns. There are three potential outcomes of acute inflammation: 1) complete resolution, 2) healing by fibrosis, or 3) chronic inflammation. It also describes four main morphological patterns of acute inflammation: serous, fibrinous, suppurative (abscess formation), and ulcerative. Each pattern is associated with different clinical presentations and histological features.
The document summarizes key aspects of acute and chronic inflammation. Acute inflammation is triggered by various stimuli and involves increased blood flow, vascular permeability, and leukocyte migration. It aims to eliminate injurious agents. Chronic inflammation arises from persistent infections, toxins, or autoimmunity and is characterized by mononuclear cell infiltration and attempts at repair through fibrosis. Nutrition can impact inflammation through deficiencies, essential fatty acids, antioxidants, and factors related to over-nutrition like obesity.
This document provides an overview of acute and chronic inflammation. It defines inflammation and outlines the main types, including acute and chronic inflammation. Acute inflammation is defined as a rapid, transient response and its stages are described as transient vasoconstriction, persistent vasodilation, increased permeability, fluid exudate formation, cellular exudate accumulation, and resolution or progression. Chronic inflammation is defined as prolonged inflammation that involves attempts at repair. Its causes include persisting infections or irritants and autoimmune reactions. The document outlines the cells involved in chronic inflammation and types of mixed acute and chronic inflammation.
Inflammation is the body's response to injury or infection and is characterized by redness, swelling, heat, pain, and loss of function. There are three main phases of inflammation - alteration, exudation, and proliferation. The type of inflammatory response depends on factors of the organism causing it and factors of the host, and can be classified as either exudative (involving fluid exudates) or proliferative (involving cell proliferation). Exudative inflammation includes serous, fibrinous, purulent, hemorrhagic, and catarrhal types defined by the character of exudates produced and their location.
Purulent inflammation, also known as suppurative inflammation, results from bacterial infection and is characterized by large amounts of pus consisting of neutrophils, dead cells, and fluid. Abscesses form when pus accumulates in enclosed tissue spaces. Examples given include suppurative appendicitis, pyelonephritis, and purulent meningitis. Suppurative appendicitis specifically involves obstruction of the appendix leading to bacterial infection, swelling, and eventual rupture and abscess formation. Pyelonephritis is a urinary tract infection of the kidneys that can cause interstitial abscesses and suppuration if severe. Purulent meningitis is an infectious inflammation of the meninges often involving the brain and
The document summarizes inflammation and its outcomes. It discusses:
1) The possible outcomes of acute inflammation are resolution, scarring (fibrosis), abscess formation, or progression to chronic inflammation.
2) Morphologic patterns of acute inflammation include non-suppurative (serous, fibrinous) and suppurative (localized like abscesses, boils, and diffuse like cellulitis) types.
3) Key cell types and processes in acute and chronic inflammation are described.
This document defines inflammation and describes its historical understanding and cardinal signs. Inflammation is defined as the host response to local injury and is fundamentally a vascular phenomenon. The four cardinal signs described by Celsus in the 1st century AD are redness, heat, swelling, and pain. Rudolf Virchow later added a fifth sign of loss of function. The document outlines the stimuli that can cause inflammation including physical, chemical, biological, and immunological factors. It describes the key cells involved in acute and chronic inflammation such as neutrophils, macrophages, lymphocytes, and plasma cells. It distinguishes between acute inflammation which has a rapid onset and involves neutrophils and chronic inflammation which has a slower onset and involves lymphocytes and macrophages.
Inflammation is the body's complex protective reaction to injury caused by various stimuli. It involves the destruction, dilution, or walling off of injurious agents. The mechanisms of inflammation include local alterations, exudation of fluid and cells, and proliferation of new tissue. Acute inflammation is characterized by classical symptoms of heat, redness, swelling, pain, and loss of function, as well as systemic responses like fever and increased white blood cell count. It involves vascular changes, cellular events like leukocyte migration, and outcomes like resolution, healing by scar tissue, or progression to chronic inflammation. Chronic inflammation is driven by lymphocytes, plasma cells, macrophages and involves distinctive patterns like granulomatous inflammation seen in tuberculosis.
The document discusses the outcomes of acute inflammation and their morphological patterns. There are three potential outcomes of acute inflammation: 1) complete resolution, 2) healing by fibrosis, or 3) chronic inflammation. It also describes four main morphological patterns of acute inflammation: serous, fibrinous, suppurative (abscess formation), and ulcerative. Each pattern is associated with different clinical presentations and histological features.
The document summarizes key aspects of acute and chronic inflammation. Acute inflammation is triggered by various stimuli and involves increased blood flow, vascular permeability, and leukocyte migration. It aims to eliminate injurious agents. Chronic inflammation arises from persistent infections, toxins, or autoimmunity and is characterized by mononuclear cell infiltration and attempts at repair through fibrosis. Nutrition can impact inflammation through deficiencies, essential fatty acids, antioxidants, and factors related to over-nutrition like obesity.
Inflammation by Dr. Amit T. Suryawanshi, Oral Surgeon, Pune All Good Things
Hi. This is Dr. Amit T. Suryawanshi. Oral & Maxillofacial surgeon from Pune, India. I am here on slideshare.com to share some of my own presentations presented at various levels in the field of OMFS. Hope this would somehow be helpful to you making your presentations. All the best.
1. Inflammation is defined as the local response to injury characterized by fluid and leukocyte movement into tissues. Acute inflammation has a rapid onset and short duration dominated by neutrophils, while chronic inflammation has a long duration dominated by mononuclear cells.
2. The classical signs of acute inflammation are redness, heat, swelling, pain, and loss of function. Systemic effects include fever, leukocytosis, lymphadenopathy, and acute phase protein production by the liver.
3. Exudative inflammation can be serous, lymphoplasmocytic, purulent, fibrinous, or gangrenous depending on the characteristics and cellular composition of the exudate and tendency for
Acute inflammation is the early response of tissues to injury and involves vascular and cellular events. The vascular events include vasodilation, increased vascular permeability allowing plasma proteins to leave circulation, and accumulation of leukocytes from the blood vessels into tissues. The principal leukocytes in acute inflammation are neutrophils. The cellular events in acute inflammation help destroy, dilute or isolate injurious agents. Mediators of acute inflammation include histamine, prostaglandins, nitric oxide, complement factors and cytokines. Acute inflammation is rapid in onset, relatively short in duration and aims to return tissues to normal function.
Chronic inflammation is a prolonged inflammatory response characterized by three key features: greater tissue destruction than acute inflammation, mononuclear infiltrates including lymphocytes and macrophages, and granulation tissue formation and scarring. Chronic inflammation can be caused by persistent infections like tuberculosis or prolonged exposure to toxic agents like silica. Macroscopically, chronic inflammation presents as chronic ulcers, abscesses, thickening of hollow organs, granulomatous lesions, and fibrosis. A granuloma is a distinctive lesion of chronic inflammation containing activated macrophages that fuse to form multinucleated giant cells.
Inflammation is the body's protective response to injury or infection that is characterized by redness, swelling, heat, pain, and loss of function. The cardinal signs result from increased blood flow, increased vascular permeability, and leukocyte infiltration at the site of injury or infection. Acute inflammation resolves within a few days, while chronic inflammation persists for weeks or longer. The outcome of acute inflammation is either resolution, progression to chronic inflammation, or repair through scarring or fibrosis.
Inflammation is the body's response to injury or infection and is marked by redness, swelling, heat, and pain. It involves both vascular and cellular events. The vascular events include vasodilation, increased blood flow, and increased vascular permeability, allowing fluid protein exudation. The cellular events involve leukocyte migration from blood vessels to infected/injured tissues, mainly neutrophils in acute inflammation. This document discusses the history, definitions, signs, and components of the acute inflammatory response.
This document defines inflammation and describes the key cellular and vascular events involved. Inflammation is the body's response to injury or infection, and involves vascular changes such as increased blood flow and permeability, as well as cellular events like the migration of white blood cells. These events are mediated by chemical signaling molecules called mediators, which help regulate the inflammatory response. The document outlines the major mediators involved and their roles in vascular changes, cellular recruitment, and resolution of inflammation.
Acute inflammation / dental implant courses by Indian dental academy Indian dental academy
The document discusses the different types of inflammation. It describes serous inflammation as characterized by a watery fluid accumulation within or beneath the epidermis. Fibrinous inflammation results from severe injuries and allows large molecules to pass through blood vessels, forming fibrin exudate in body cavities. Suppurative inflammation is characterized by pus consisting of neutrophils, dead cells, and fluid. Ulceration involves necrosis of cells and shedding of tissue, resulting in a local defect on the surface.
Inflammation is the body's response to infection, injury, or irritation. The cardinal signs of inflammation are redness, swelling, heat, pain, and loss of function. Acute inflammation occurs rapidly and is short-lived, while chronic inflammation persists over a longer period of time. Mediators of inflammation such as histamine, prostaglandins, and cytokines are released from platelets, neutrophils, monocytes, and mast cells to regulate the inflammatory response. Defective or excessive inflammation can lead to increased susceptibility to infection or disease.
Inflammation is the body's response to irritation or injury. There are two main types: acute and chronic. Acute inflammation occurs rapidly in response to a short-term irritant and is characterized by the five signs of redness, heat, swelling, pain, and loss of function. The response involves increased blood flow, exudation of fluid, and migration of white blood cells. Chronic inflammation lasts longer in response to a prolonged irritant and is characterized by lymphocytes, plasma cells, and fibrosis. Specific types of inflammation include suppurative (with pus), catarrhal, membranous, and granulomatous inflammation seen in diseases like tuberculosis.
Inflammation is the protective response to eliminate the cause of cell injury and damaged tissue. It is characterized by redness, heat, swelling, pain, and loss of function. The signs are caused by increased blood flow and vascular permeability. Inflammation can be acute, lasting minutes to days, or chronic, lasting weeks or months. Acute inflammation involves recruitment of leukocytes from the bloodstream to fight infection at the site of injury. Chronic inflammation is prolonged and involves tissue destruction by mononuclear cells and attempts at healing through fibrosis. Mediators like cytokines prolong the inflammatory response.
This document discusses chronic and granulomatous inflammation. Chronic inflammation is prolonged inflammation that involves simultaneous active inflammation, tissue injury, and healing over weeks to months. It is characterized by mononuclear cell infiltration including macrophages, lymphocytes, and plasma cells. Macrophages secrete products that can cause tissue damage if unchecked. Granulomatous inflammation forms nodules called granulomas composed of epithelioid macrophages surrounded by lymphocytes. Common causes that elicit granulomatous inflammation include bacteria like Mycobacterium tuberculosis, fungi, parasites, and foreign materials.
1. Acute inflammation is a short-term process lasting from a few minutes to a few days that is characterized by redness, heat, swelling, pain, and loss of function. It involves vasodilation, increased vascular permeability, and cellular changes.
2. The cellular changes in acute inflammation include the migration of neutrophils, macrophages, and other white blood cells to the site of injury to remove foreign substances and damaged tissue through phagocytosis.
3. There are two main types of acute inflammation - suppurative inflammation, which involves pus formation caused by pyogenic bacteria, and non-suppurative inflammation, which does not involve pus formation and can be catarrhal, fibrinous,
Definition of inflammation, Causes, Signs of inflammation, Types of inflammation, Triple response, Phagocytosis, Transudate or Exudate, Difference between transudate and exudate, Granuloma and Granulomatous inflammation
Inflammation (Acute and Chronic) Prof Mulazim Hussain BukhariMulazim Bukhari
This document discusses acute inflammation. It defines inflammation, outlines the causes and molecular events of inflammation including vasodilation, vascular leakage, and leukocyte recruitment. It describes the cardinal signs of inflammation and summarizes the mechanisms of increased vascular permeability and leukocyte extravasation through selectin-mediated rolling, integrin-mediated adhesion, and transmigration across endothelial cells.
Inflammation is the body's protective response to eliminate the initial cause of cell injury and initiate repair. It can be classified as acute or chronic based on duration, and by the type of exudate or cause. The classic signs of inflammation are redness, pain, swelling, heat, and loss of function. Acute appendicitis shows a swollen, reddish appendix on gross examination. Acute meningitis presents as a grayish-white exudate over the brain surface and prominent blood vessels on gross examination. Microscopy shows extensive necrosis surrounded by inflammatory cells in pyemic abscesses of the lung, kidney, and other organs. Pericarditis appears as an irregular, shaggy fibrinous ex
Inflammation is the protective response of tissues to injury or infection. The document outlines the key aspects of acute and chronic inflammation including:
1) The mediators of acute inflammation such as histamine, prostaglandins, and cytokines which cause redness, swelling, heat and pain.
2) Chronic inflammation is characterized by persistence of the inflammatory response and attempts at repair/regeneration. It involves lymphocytes, plasma cells and macrophages.
3) Granulomatous inflammation forms distinct nodules or granulomas that wall off chronic infections or foreign materials.
This document provides an overview of inflammation and healing. It defines inflammation as the body's response to injury, discussing the causes, signs, and types (acute and chronic) of inflammation. Acute inflammation involves vascular changes like increased blood flow and permeability, as well as cellular events like leukocyte migration and phagocytosis. Chemical mediators released from cells and plasma regulate these inflammatory responses. Healing is defined as the process of tissue regeneration and repair after injury or inflammation.
Inflammation and Healing (wound healing)Rajat Nanda
This document provides information on inflammation and healing in 3 sections. The first section defines inflammation, describes the causes and signs of inflammation, and outlines the types, features, and chemical mediators involved in acute and chronic inflammation. The second section defines healing and describes the processes of regeneration, repair, and wound healing. The third section focuses specifically on chronic inflammation, defining it, outlining its causes and general features including mononuclear cell infiltration, tissue destruction by activated macrophages, and proliferative changes involved in the healing process.
This document provides an overview of inflammation. It begins with an introduction that defines inflammation and discusses its purpose. The document then covers the history of inflammation, the causes of inflammation including both exogenous and endogenous factors. It describes the classification of inflammation as either acute or chronic. The document discusses the vascular and cellular events of acute inflammation in detail. It explains the role of chemical mediators in inflammation and lists some of the major mediators. Finally, it briefly mentions chronic inflammation and inflammatory diseases.
Inflammation by Dr. Amit T. Suryawanshi, Oral Surgeon, Pune All Good Things
Hi. This is Dr. Amit T. Suryawanshi. Oral & Maxillofacial surgeon from Pune, India. I am here on slideshare.com to share some of my own presentations presented at various levels in the field of OMFS. Hope this would somehow be helpful to you making your presentations. All the best.
1. Inflammation is defined as the local response to injury characterized by fluid and leukocyte movement into tissues. Acute inflammation has a rapid onset and short duration dominated by neutrophils, while chronic inflammation has a long duration dominated by mononuclear cells.
2. The classical signs of acute inflammation are redness, heat, swelling, pain, and loss of function. Systemic effects include fever, leukocytosis, lymphadenopathy, and acute phase protein production by the liver.
3. Exudative inflammation can be serous, lymphoplasmocytic, purulent, fibrinous, or gangrenous depending on the characteristics and cellular composition of the exudate and tendency for
Acute inflammation is the early response of tissues to injury and involves vascular and cellular events. The vascular events include vasodilation, increased vascular permeability allowing plasma proteins to leave circulation, and accumulation of leukocytes from the blood vessels into tissues. The principal leukocytes in acute inflammation are neutrophils. The cellular events in acute inflammation help destroy, dilute or isolate injurious agents. Mediators of acute inflammation include histamine, prostaglandins, nitric oxide, complement factors and cytokines. Acute inflammation is rapid in onset, relatively short in duration and aims to return tissues to normal function.
Chronic inflammation is a prolonged inflammatory response characterized by three key features: greater tissue destruction than acute inflammation, mononuclear infiltrates including lymphocytes and macrophages, and granulation tissue formation and scarring. Chronic inflammation can be caused by persistent infections like tuberculosis or prolonged exposure to toxic agents like silica. Macroscopically, chronic inflammation presents as chronic ulcers, abscesses, thickening of hollow organs, granulomatous lesions, and fibrosis. A granuloma is a distinctive lesion of chronic inflammation containing activated macrophages that fuse to form multinucleated giant cells.
Inflammation is the body's protective response to injury or infection that is characterized by redness, swelling, heat, pain, and loss of function. The cardinal signs result from increased blood flow, increased vascular permeability, and leukocyte infiltration at the site of injury or infection. Acute inflammation resolves within a few days, while chronic inflammation persists for weeks or longer. The outcome of acute inflammation is either resolution, progression to chronic inflammation, or repair through scarring or fibrosis.
Inflammation is the body's response to injury or infection and is marked by redness, swelling, heat, and pain. It involves both vascular and cellular events. The vascular events include vasodilation, increased blood flow, and increased vascular permeability, allowing fluid protein exudation. The cellular events involve leukocyte migration from blood vessels to infected/injured tissues, mainly neutrophils in acute inflammation. This document discusses the history, definitions, signs, and components of the acute inflammatory response.
This document defines inflammation and describes the key cellular and vascular events involved. Inflammation is the body's response to injury or infection, and involves vascular changes such as increased blood flow and permeability, as well as cellular events like the migration of white blood cells. These events are mediated by chemical signaling molecules called mediators, which help regulate the inflammatory response. The document outlines the major mediators involved and their roles in vascular changes, cellular recruitment, and resolution of inflammation.
Acute inflammation / dental implant courses by Indian dental academy Indian dental academy
The document discusses the different types of inflammation. It describes serous inflammation as characterized by a watery fluid accumulation within or beneath the epidermis. Fibrinous inflammation results from severe injuries and allows large molecules to pass through blood vessels, forming fibrin exudate in body cavities. Suppurative inflammation is characterized by pus consisting of neutrophils, dead cells, and fluid. Ulceration involves necrosis of cells and shedding of tissue, resulting in a local defect on the surface.
Inflammation is the body's response to infection, injury, or irritation. The cardinal signs of inflammation are redness, swelling, heat, pain, and loss of function. Acute inflammation occurs rapidly and is short-lived, while chronic inflammation persists over a longer period of time. Mediators of inflammation such as histamine, prostaglandins, and cytokines are released from platelets, neutrophils, monocytes, and mast cells to regulate the inflammatory response. Defective or excessive inflammation can lead to increased susceptibility to infection or disease.
Inflammation is the body's response to irritation or injury. There are two main types: acute and chronic. Acute inflammation occurs rapidly in response to a short-term irritant and is characterized by the five signs of redness, heat, swelling, pain, and loss of function. The response involves increased blood flow, exudation of fluid, and migration of white blood cells. Chronic inflammation lasts longer in response to a prolonged irritant and is characterized by lymphocytes, plasma cells, and fibrosis. Specific types of inflammation include suppurative (with pus), catarrhal, membranous, and granulomatous inflammation seen in diseases like tuberculosis.
Inflammation is the protective response to eliminate the cause of cell injury and damaged tissue. It is characterized by redness, heat, swelling, pain, and loss of function. The signs are caused by increased blood flow and vascular permeability. Inflammation can be acute, lasting minutes to days, or chronic, lasting weeks or months. Acute inflammation involves recruitment of leukocytes from the bloodstream to fight infection at the site of injury. Chronic inflammation is prolonged and involves tissue destruction by mononuclear cells and attempts at healing through fibrosis. Mediators like cytokines prolong the inflammatory response.
This document discusses chronic and granulomatous inflammation. Chronic inflammation is prolonged inflammation that involves simultaneous active inflammation, tissue injury, and healing over weeks to months. It is characterized by mononuclear cell infiltration including macrophages, lymphocytes, and plasma cells. Macrophages secrete products that can cause tissue damage if unchecked. Granulomatous inflammation forms nodules called granulomas composed of epithelioid macrophages surrounded by lymphocytes. Common causes that elicit granulomatous inflammation include bacteria like Mycobacterium tuberculosis, fungi, parasites, and foreign materials.
1. Acute inflammation is a short-term process lasting from a few minutes to a few days that is characterized by redness, heat, swelling, pain, and loss of function. It involves vasodilation, increased vascular permeability, and cellular changes.
2. The cellular changes in acute inflammation include the migration of neutrophils, macrophages, and other white blood cells to the site of injury to remove foreign substances and damaged tissue through phagocytosis.
3. There are two main types of acute inflammation - suppurative inflammation, which involves pus formation caused by pyogenic bacteria, and non-suppurative inflammation, which does not involve pus formation and can be catarrhal, fibrinous,
Definition of inflammation, Causes, Signs of inflammation, Types of inflammation, Triple response, Phagocytosis, Transudate or Exudate, Difference between transudate and exudate, Granuloma and Granulomatous inflammation
Inflammation (Acute and Chronic) Prof Mulazim Hussain BukhariMulazim Bukhari
This document discusses acute inflammation. It defines inflammation, outlines the causes and molecular events of inflammation including vasodilation, vascular leakage, and leukocyte recruitment. It describes the cardinal signs of inflammation and summarizes the mechanisms of increased vascular permeability and leukocyte extravasation through selectin-mediated rolling, integrin-mediated adhesion, and transmigration across endothelial cells.
Inflammation is the body's protective response to eliminate the initial cause of cell injury and initiate repair. It can be classified as acute or chronic based on duration, and by the type of exudate or cause. The classic signs of inflammation are redness, pain, swelling, heat, and loss of function. Acute appendicitis shows a swollen, reddish appendix on gross examination. Acute meningitis presents as a grayish-white exudate over the brain surface and prominent blood vessels on gross examination. Microscopy shows extensive necrosis surrounded by inflammatory cells in pyemic abscesses of the lung, kidney, and other organs. Pericarditis appears as an irregular, shaggy fibrinous ex
Inflammation is the protective response of tissues to injury or infection. The document outlines the key aspects of acute and chronic inflammation including:
1) The mediators of acute inflammation such as histamine, prostaglandins, and cytokines which cause redness, swelling, heat and pain.
2) Chronic inflammation is characterized by persistence of the inflammatory response and attempts at repair/regeneration. It involves lymphocytes, plasma cells and macrophages.
3) Granulomatous inflammation forms distinct nodules or granulomas that wall off chronic infections or foreign materials.
This document provides an overview of inflammation and healing. It defines inflammation as the body's response to injury, discussing the causes, signs, and types (acute and chronic) of inflammation. Acute inflammation involves vascular changes like increased blood flow and permeability, as well as cellular events like leukocyte migration and phagocytosis. Chemical mediators released from cells and plasma regulate these inflammatory responses. Healing is defined as the process of tissue regeneration and repair after injury or inflammation.
Inflammation and Healing (wound healing)Rajat Nanda
This document provides information on inflammation and healing in 3 sections. The first section defines inflammation, describes the causes and signs of inflammation, and outlines the types, features, and chemical mediators involved in acute and chronic inflammation. The second section defines healing and describes the processes of regeneration, repair, and wound healing. The third section focuses specifically on chronic inflammation, defining it, outlining its causes and general features including mononuclear cell infiltration, tissue destruction by activated macrophages, and proliferative changes involved in the healing process.
This document provides an overview of inflammation. It begins with an introduction that defines inflammation and discusses its purpose. The document then covers the history of inflammation, the causes of inflammation including both exogenous and endogenous factors. It describes the classification of inflammation as either acute or chronic. The document discusses the vascular and cellular events of acute inflammation in detail. It explains the role of chemical mediators in inflammation and lists some of the major mediators. Finally, it briefly mentions chronic inflammation and inflammatory diseases.
This document summarizes a seminar on the cascade of inflammation. It discusses the signs of inflammation, inflammatory cells and mediators, types of inflammation including acute and chronic, and the mechanisms and cellular events of acute inflammation. Specifically, it outlines the vascular events of acute inflammation including changes in blood flow and vascular permeability, as well as the cellular events of leucocyte exudation and phagocytosis.
This document discusses inflammation. It begins by defining inflammation as the body's response to injury or infection where it aims to eliminate the cause and initiate repair. It then discusses the different causes of inflammation including physical, chemical, biological, and immunological factors. The key events of acute inflammation are also summarized, including vascular changes that cause increased blood flow and permeability, cellular events like leukocyte recruitment and phagocytosis, and the typical signs of inflammation. Chronic inflammation is described as a prolonged response where tissue injury and healing occur simultaneously.
Inflammation is the body's response to injury or infection that involves increased blood flow, swelling, heat, and pain. It is caused by infectious agents like bacteria or viruses, physical trauma, chemicals, or foreign materials. The signs of inflammation are redness, swelling, heat, pain, and loss of function. Acute inflammation resolves within 2 weeks while chronic inflammation persists longer. In acute inflammation, blood vessels dilate, increasing blood flow and permeability, which causes fluid leakage. This is followed by the migration of white blood cells like neutrophils from blood vessels into tissues. The white blood cells are then activated to perform functions like phagocytosis to help resolve the inflammatory response and initiate healing.
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The document provides an overview of inflammation, including its definition, etiology, cardinal signs, types (acute and chronic), vascular and cellular events in acute inflammation, mediators, regulation, inflammatory cells, factors affecting acute inflammation, and the fate of acute inflammation. It also discusses chronic inflammation, granulomatous inflammation, comparing acute and chronic inflammation, and dental implications including pulpal infections, periapical infections/inflammation, gingival inflammation, and periodontal inflammation.
Inflammation is the body's response to injury or infection and involves increased blood flow, swelling, redness, heat, and pain. It is caused by agents like bacteria, viruses, toxins, or physical/chemical/immunological insults. The signs of acute inflammation include increased vascular permeability, exudation of fluid, and migration of leukocytes. Chronic inflammation differs in that it persists over a long period of time, involves mononuclear cells, and can cause tissue destruction and fibrosis. Periodontal inflammation specifically refers to the inflammatory response of tissues surrounding and supporting the teeth.
- Inflammation is the body's response to injury and involves both vascular and cellular events.
- Vascular events include increased blood flow, vascular permeability and fluid leakage, causing redness, swelling and heat.
- Cellular events involve the migration of white blood cells (leukocytes) from blood vessels to tissues through a process of rolling, adhesion and emigration.
- Leukocytes then help fight infection through phagocytosis of microbes and debris clearance as part of the inflammatory response and healing process.
Inflammation and wound healing is a complex process involving several steps. It begins with an acute inflammatory response triggered by injury or infection, characterized by redness, swelling, heat and pain. This response involves increased vascular permeability, migration of white blood cells, and release of chemical mediators. Over time, the inflammatory response transitions to a chronic phase involving lymphocytes and macrophages. Wound healing occurs through regeneration or repair, involving re-epithelialization, granulation tissue formation, collagen deposition and wound contraction. Primary healing closes wounds through direct apposition of wound edges, while secondary healing relies on granulation tissue to fill open wounds.
This document defines inflammation and provides details about the types, causes, and features of acute and chronic inflammation. It discusses:
- The definition of inflammation as the body's protective response to rid itself of injurious stimuli and damaged cells.
- The two main types of inflammation - acute, which is short-term and resolves quickly, and chronic, which is long-lasting and occurs when the stimulus persists.
- The key cellular and vascular events in acute inflammation, including increased vascular permeability, exudation of leukocytes, and phagocytosis by neutrophils and macrophages.
- The various chemical mediators that regulate acute inflammation.
- The potential outcomes of acute inflammation and features of chronic inflammation
Acute and chronic inflammation can be summarized as follows:
1. Acute inflammation is an initial rapid response to infection or tissue damage characterized by vascular changes like vasodilation and increased permeability, cellular events like leukocyte extravasation, and aims to eliminate the cause and promote healing.
2. Chronic inflammation is prolonged inflammation that can last weeks or months, features mononuclear cell infiltration, ongoing tissue destruction and attempts at repair simultaneously, and can lead to fibrosis or scarring.
3. Causes of chronic inflammation include persistent infections, hypersensitivity reactions, exposure to toxic agents, and autoimmunity. Granulomatous inflammation is a distinctive chronic pattern featuring macrophage aggregation. Systemic effects include fever
This document summarizes the key aspects of inflammation. It begins by defining inflammation and describing the cardinal signs. It then discusses the etiological factors, types of inflammation (acute vs chronic), and the haemodynamic and cellular events in acute inflammation. Specifically, it outlines the vascular changes, increased permeability, exudation of leukocytes, and process of phagocytosis. It also discusses the chemical mediators of inflammation like histamine, kinins, cytokines, prostaglandins, and the resolution of inflammation. Finally, it concludes that inflammation is an important immune response but better understanding its pathways could aid in treating diseases.
This document discusses inflammation and healing. It defines inflammation as the local response of living tissues to injury. The causes of inflammation can be exogenous, such as physical or chemical agents, or endogenous like circulation disorders or metabolic products. The classic signs of inflammation are redness, swelling, heat, and pain. Acute inflammation involves rapid onset and short duration, while chronic inflammation has insidious onset and longer duration. Acute inflammation is characterized by increased blood flow, vascular permeability, and leukocyte infiltration. Chronic inflammation features infiltration by mononuclear cells like macrophages and lymphocytes, along with simultaneous tissue destruction and healing.
Inflammation can be acute or chronic. Acute inflammation is characterized by rapid onset, short duration, and neutrophil infiltration. The classic signs are redness, swelling, heat, pain, and loss of function. Chemotactic factors recruit neutrophils from the bloodstream into tissues through a multi-step process. Neutrophils then phagocytose pathogens and debris. Chemical mediators like histamine, bradykinin, prostaglandins, and cytokines are released to increase vascular permeability and perpetuate the inflammatory response. Chronic inflammation is long-lasting with lymphocyte and macrophage involvement, potentially progressing to tissue damage if unresolved.
The document provides information about inflammation including its causes, classification, and mechanisms. It discusses how inflammation is the body's response to harmful stimuli and can be either acute or chronic. Acute inflammation develops rapidly in response to injury and involves innate immune responses, while chronic inflammation can last months to years and involves adaptive immunity. The key events of acute inflammation are increased blood flow, vascular permeability, and migration of immune cells to the site of injury.
This document provides an overview of inflammation. It defines inflammation and divides it into acute and chronic types. The components of inflammation include vascular reactions and cellular reactions. Acute inflammation is characterized by neutrophil accumulation and lasts for a short period, while chronic inflammation involves lymphocytes and macrophages and lasts longer. The document further describes the stimuli, vascular changes, and cellular events involved in acute inflammation, including leukocyte margination, rolling, adhesion, transmigration, and phagocytosis. It also discusses the chemical mediators and outcomes of acute inflammation.
Acute inflammation is the body's initial protective response to harmful stimuli or damaged tissue. It is characterized by vascular changes such as increased blood flow and vascular permeability, as well as the recruitment of immune cells like neutrophils to the site of injury. A variety of chemical mediators are involved in regulating the inflammatory response, including histamine, prostaglandins, cytokines, free radicals, and components of the complement system. Acute inflammation can resolve with repair of the damaged tissue, result in fibrosis or scarring if damage is extensive, or progress to a chronic inflammatory state.
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2. INTRODUCTION
DEFINITION AND CAUSES Inflammation is defined as the local response of
living mammalian tissues to injury from any agent. It is a body defense
reaction in order to eliminate or limit the spread of injurious agent, followed
by removal of thE cells and tissues.
The injurious agents causing inflammation may be as under:
1. Infective agents like bacteria, viruses and their toxins, fungi,
parasites.
2. Immunological agents like cell-mediated and antigen antibody
reactions.
3. Physical agents like heat, cold, radiation, mechanical
trauma.
4. Chemical agents like organic and inorganic poisons.
5. Inert materials such as foreign bodies.
3. Thus, inflammation is distinct from infection—inflammationis a protective
response by the body to variety of etiologic agents (infectious or non-
infectious), while infectiois invasion into the body by harmful microbes and
theirresultant ill-effects by toxins.
Inflammation involves 2 basic
processes with some overlapping, viz. early inflammatory
response and later followed by healing.
Though both these processes generally have protective role against
injurious agents, inflammation and healing may cause considerable harm
to the body as well e.g. anaphylaxis to bites by insects or reptiles, drugs,
toxins, atherosclerosis, chronic rheumatoid arthritis, fibrous bands.
4. SIGNS OF INFLAMMATION:
4 cardinal signs of
inflammation as:
i) rubor (redness);
ii) tumor (swelling);
iii) calor (heat); and
iv) dolor (pain).
To these, fifth sign functio laesa (loss of function/immobility)
Vi)Exudation(escape of fluid from vascular system to intestinal space)
Vi) Transudation (escape of fluid with less protin content)
Vii)edema (accumulation of fluid)
Viii)pusformation/
6. CLASSIFICATION OF ACUTE INFLAMATION
I)VASCULAREVENTS
II) CELLUAR EVENTS
( TWO CHANGES ) ALTERED VASCULAR PERMIABILITY
PHAGOCYTOSIS
HEAMODYNAMIC EXUDATION(ESCAPE
CHANGES(EARLIEST EVENT) OF FLUID)
7. ACUTE INFLAMMATION
Acute inflammatory response by the host process
but for the purpose of discussion it can be divided
in to two types
Vascular events
Cellular events
Intimately linked to these two process is the release of mediators of acute
inflammation
8. VASCULAREVENTS :
Alternation in the microvasculature is the earliest response to cell injury.
This alternations includes haemodynamic changes and changes in
vascular permeability .
9. HAEMODYNAMIC CHANGES
Irrespective of the type of cell injury immediate vascular response is of translent
vasoconstriction of arterioles. With mild form of injury the blood flow may be re-established in
3-5sec while with more severe injury the vasoconstriction may last for about 5min.
Next follow persistent progressive vasodilation which involves mainly arterioles but to a lesser
extent affects other components of the microcirculation like venules and the capillaries.This
changes is obvious within half a hr of the injury. Vasodilation results in the increased blood
volume in the microvascular bed of the area which is responsible for the redness andwarmth
at the site of acute inflammation.
Progressive vasodilation in the turn may elevate the local hydrostatic pressure resulting in
transudation of fluid in to the extracellular space . This is responsible for the swelling at the
local site of acute inflammation.
Slowing or stasis of microcirculation follows which causes increased concentration of red cells
and thus raised blood viscosity.
Stasis or slowing is followed by leucocytic margination or peripheral orientation of leucocytes
along the vascular endothelium . This process is known as emigration .
10. TRIPLE RESPONSE
Lewis induced the changes in the skin of inner aspect of forearm by
firm stroking with a blunt point . The reaction so elicited is known as
triple response or red line response.
Red line appears within a few sec after stroking and is due to local
vasodilatation of capillaries and venules.
Flare is the bright reddish appearance or flush surrounding the red
line and results from vasodilatation of the adjacent arterioles.
Wheals is the swelling or oedema of the surrounding skin occurring
due to transudation of fluid in to the extravascular space .
11. PATHOGENESIS
The appearance of inflammatory oedema due to increased vascular
permeability of microvascular bed is explained on the basis of
starling’s hypothesis.
Force that cause outwards movement of the fluid from microcirculation
.
Forces that causes inward movement of the fluid in to the
microcirculation.
forces are intravascular hydrostatic pressure and colloidal osmotic
pressure .
12. PATTERNS OF INCREASED VASCULAR PERMEABILITY
Endothelial cell contraction
Contraction or mild endothelial injury
Direct endothelial cell injury
Leucocyte-mediated endothelial injury
Neovascularisation .
16. II]CELLULAR EVENTS
The cellular phase of inflammation consist of 2 processes :
exudation of leucocytes
1. Exudation
2. Phagocytosis
1.exudation of leucocytes :
1.Changes in the formed elements of blood
2.Rolling and adhesion
3.Emigration
4.Chemotaxis
17. 2.Phagocytosis:
Phagocytosis is defined as the process of engulfment of solidparticulate
material by the cells (cell-eating). The cellsperforming this function are called
phagocytes. There are 2 main types of phagocytic cells.
i) Polymorphonuclear neutrophils (PMNs) which appearearly in acute
inflammatory response, sometimes called as MICROPHAGES.
II)Circulating monocytes and fixed tissue mononuclearphagocytes, commonly
called as macrophages.
18. THE MICROBE UNDERGOES THE PROCESS OF
PHAGOCYTOSIS BY POLYMORPHS AND MACROPHAGES AND INVOLVES
THE FOLLOWING 3 STEPS
1. Recognition and attachment:
2. Engulfment
3. Killing and degradation
19. A. INTRACELLULARMECHANISMS
i) Oxidative bactericidal mechanism by oxygen free
radicals. An important mechanism of microbicidal killing is
by oxidative damage by the production of reactive oxygen
metabolites (O’2 H2O2, OH’, HOCl, HOI, HOBr).A phase of increased oxygen
consumption (‘respiratoryburst’) by activated phagocytic leucocytes requires
theessential presence of NADPH oxidase.
NADPH-oxidase present in the cell membrane ofphagosome reduces oxygen to
superoxide ion (O’2):2O2 2O’2NADPH (Superoxideoxidase anion)NADPH NADP
+ H+
Superoxide is subsequently converted into H2O2 whichhas bactericidal
properties:
2O’2 + 2H+ H2O2
(Hydrogen peroxide)This type of bactericidal activity is carried out either
viaenzyme myeloperoxidase (MPO) present in the azurophilicgranules of
neutrophils and monocytes, or independent ofenzyme MPO, as under:
20. a) MPO-dependent killing. In this mechanism, the enzyme :MPO acts on H2O2 in the presence of
halides (chloride, iodideor bromide) to form hypohalous acid (HOCl, HOI, HOBr).
This is called H2O2-MPO-halide system and is more potent antibacterial system in polymorphs than
H2O2 alone:
MPO: H2O2 HOCl + H2O {Cl’, Br’, I’ (Hypochlorous acid)
b) MPO-independent killing. Mature macrophages lack the enzyme MPO and they carry out
bactericidal activity by producing OH– ions and superoxide singlet oxygen (O’) from
H2O2 in the presence of O’2 (Haber-Weiss reaction) or in the presence of Fe++ (Fenton reaction):
Reactive oxygen metabolites are particularly useful in eliminating microbial organisms that grow
withinphagocytes e.g. M. tuberculosis, Histoplasma capsulatum.
ii) Oxidative bactericidal mechanism by lysosomal
granules. In this mechanism, the preformed granule-stored products of neutrophils and
macrophages are discharged orsecreted into the phagosome and the extracellularenvironment.
While the role of MPO is already highlighted above, others liberated by degranulation of macrophages
andneutrophils are protease, trypsinase, phospholipase, and alkaline phosphatase.
Progressive degranulation of neutrophils and macrophages along with oxygen free radicals
degrades proteins i.e. induces proteolysis.
21. iii) Non-oxidative bactericidal mechanism. Some agentsreleased from
the granules of phagocytic cells do not require oxygen for bactericidal
activity.
These include the following:
a) Granules. Some of liberated lysosomal granules do not kill by oxidative
damage but cause lysis of within phagosome.
These are lysosomal hydrolases, permeability increasing factors, cationic
proteins (defensins), lipases, ptoteases, DNAases.
b) Nitric oxide. Nitric oxide reactive free radicals similar to oxygen free
radicals are formed by nitric oxide synthase and is a potent mechanism of
microbial killing.
Nitric oxide isproduced by endothelial cells as well as by activated
macrophages.
22. B. EXTRACELLULARMECHANISMS
i) Granules. Degranulation of macrophages and neutrophils explained
above continues to exert its effects of proteolysis outside the cells as well.
ii) Immune mechanisms. :immune-mediated lysis of microbes takes
place outside the cells by mechanisms of cytolysis, antibody-mediated
lysis and by cell-mediated cytotoxicity
23. FACTORS DETERMINING VARIATION IN
INFLAMMATORYRESPONSE
1. Factors Involving the Organisms
i to herpes simplex infection by
formation of vesicle and to streptococcal infection by formation of boil; lung reacts to
pneumococci by occurrence of lobar pneumonia while to tubercle bacilli it reacts by
granulomatous inflammation.
ii) Virulence. Many species and strains of organisms may have varying virulence e.g. the
three strains of c.diphtheria(gravis,intermedius and mitis) produce the same diphtherial
exotoxin but in different amount.
iii) Dose. The concentration of organism in small doses produces usually local lesions
while larger dose results inmore severe spreading infections.
iv) Portal of entry. Some organisms are infective only if
administered by particular route e.g. Vibrio cholerae is not pathogenic if injected
subcutaneously but causes cholera if swallowed.
v) Product of organisms. Some organisms produce enzymes
that help in spread of infections e.g. hyaluronidase by Clostridium welchii, streptokinase by
streptococci, staphylokinase and coagulase by staphylococci
24. 2. Factors Involving the Host
i) Systemic diseases. Certain acquired systemic diseases
in the host are associated with impaired inflammatory response e.g. diabetes mellitus,
chronic renal failure, cirrhosis of the liver, chronic alcoholism, bone marrow suppression
from various causes (drugs, radiation, idiopathic). These conditions render the host more
susceptible to infections.
ii) Immune status of host. Patients who are immunosuppressed from congenital or
acquired immunodeficiency have lowered inflammatory response and spread of
infections occurs rapidly e.g. in AIDS, congenital immunodeficiency diseases, protein
calorie malnutrition, starvation.
iii) Congenital neutrophil defects. Congenital defects in neutrophil structure and
functions result in reduced
inflammatory response.
iv) Leukopenia. Patients with low WBC count with neutropenia or agranulocytosis
develop spreading infection.
v) Site or type of tissue involved. For example, the lung has loose texture as
compared to bone and, thus, both tissues react differently to acute inflammation.
vi) Local host factors. For instance, ischaemia, presence of foreign bodies and
chemicals cause necrosis and are thuscause more harm.
25. 3. Type of Exudation
The appearance of escaped plasma determines the morphologic type of
inflammation as under:
i) Serous, when the fluid exudate resembles serum or is watery e.g.
pleural effusion in tuberculosis, blister formation in burns.
ii) Fibrinous, when the fibrin content of the fluid exudate is high e.g. in
pneumococcal and rheumatic pericarditis.
iii) Purulent or suppurative exudate is formation of creamy pus as
seen in infection with pyogenic bacteria e.g. abscess, acute appendicitis.
iv) Haemorrhagic, when there is vascular damage e.g. acute
haemorrhagic pneumonia in influenza.
v) Catarrhal, when the surface inflammation of epithelium produces
increased secretion of mucous e.g. common cold
26. MORPHOLOGY OF ACUTE INFLAMMATION
1. PSEUDOMEMBRANOUS INFLAMMATION. It is inflammatory response
of mucous surface (oral, respiratory,bowel) to toxins of diphtheria or irritant
gases. plasma exudes on the surfacewhere it coagulates, and together with
necrosed epithelium,forms false
2. ULCER. Ulcers are local defects on the surface of an organ produced by
inflammation. Common sites for ulcerations are the stomach, duodenum,
intestinal ulcers in typhoid fever, intestinal tuberculosis, bacillary and amoebic
dysentery,ulcers of legs due to varicose veins etc.
3. SUPPURATION (ABSCESS FORMATION). When acute bacterial
infection is accompanied by intense neutrophilic infiltrate in the inflamed
tissue, it results in tissuenecrosis. A cavity is formed which is called an
abscess and contains purulent exudate or pus and the process of abscess
formation is known as suppuration.
The bacteria which cause suppuration are called pyogenic.
27. An abscess may be discharged to the surface due to increased pressure
inside or may require drainage by thesurgeon. Due to tissue destruction,
resolution does not occur but instead healing by fibrous scarring takes
place.
i) Boil or furruncle which is an acute inflammation via hair follicles in the
dermal tissues.
ii) Carbuncle is seen in untreated diabetics and occurs as a loculated
abscess in the dermis and soft tissues of the neck.
28. 4. CELLULITIS. It is a diffuse inflammation of soft tissues resulting from
spreading effects of substances like hyaluronidase released by some bacteria.
5. BACTERIAL INFECTION OF THE BLOOD. This includes the following 3
conditions:
i) Bacteraemia is defined as presence of small number of bacteria in the
blood which do not multiply significantly.
They are commonly not detected by direct microscopy. Blood culture is done for
their detection e.g. infection with Salmonella typhi, Escherichia coli,
Streptococcus viridans.
ii) Septicaemia means presence of rapidly multiplying, highly pathogenic
bacteria in the blood e.g. pyogenic cocci, bacilli of plague etc. Septicaemia is
generally accompanied by systemic effects like toxaemia, multiple
smallhaemorrhages, neutrophilic leucocytosis and disseminatedintravascular
coagulation (DIC).
29. iii) Pyaemia is the dissemination of small septic thrombi in the blood
which cause their effects at the site where they arelodged. This can result
in pyaemic abscesses or septic infarcts.
a) Pyaemic abscesses are multiple small abscesses in various organs
such as in cerebral cortex, myocardium, lungs and renal cortex, resulting
from very small emboli fragmented from septic thrombus. Microscopy of
pyaemic abscess shows a central zone of necrosis containing numerous
bacteria, surrounded by a zone of suppuration and an outer zone of acute
inflammatory cells.
b) Septic infarcts result from lodgement of larger fragments of septic
thrombi in the arteries with relatively larger foci of necrosis, suppuration
and acute inflammation e.g. septic infarcts of the lungs, liver, brain, and
kidneys from septic thrombi of leg veins or from acute bacterial
endocarditis
30. SYSTEMICEFFECTSOF ACUTE INFLAMMATION
1. Fever occurs due to bacteraemia. It is thought to be mediated through
release of factors like prostaglandins,interleukin-1 and TNF-α in response to
infection.
2. Leucocytosis commonly accompanies the acute inflammatory reactions,
usually in the range of 15,000- 20,000/μl. When the counts are higher than this
with ‘shift to left’ of myeloid cells, the blood picture is described as leukaemoid
reaction.
3. Lymphangitis-lymphadenitis is the important manifestations of
localised inflammatory injury. The lymphatics and lymph nodes that drain the
inflamed tissue show reactive inflammatory changes in the form of
lymphangitis and lymphadenitis.
31. 4. Shock may occur in severe cases. Massive release of cytokine TNF-
α, a mediator of inflammation, in response to severe tissue injury or
infection results in profusesystemic vasodilatation, increased vascular
permeability and intravascular volume loss.
32. FATE OF ACUTE INFLAMMATION
1. Resolution. It means complete return to normal tissue following acute inflammation.
This occurs when tissue changes are slight and the cellular changes are reversible e.g.
resolution in lobar pneumonia.
2. Healing. Healing by fibrosis takes place when the tissue destruction in acute
inflammation is extensive so that there is no tissue regeneration. But when tissue loss is
superficial,it is restored by regeneration.
3. Suppuration. When the pyogenic bacteria causing acute inflammation result in
severe tissue necrosis, the process progresses to suppuration. Initially, there is intense
neutrophilic infiltration. Subsequently, mixture of neutrophils,bacteria, fragments of
necrotic tissue, cell debris and fibrin comprise pus which is contained in a cavity to form
an abscess.
The abscess, if not drained, may get organised by dense fibrous tissue, and in time, get
calcified.
4. Chronic inflammation. Persisting or recurrent acute inflammation may progress to
chronic inflammation in which the processes of inflammation and healing proceed side by
side.
35. CHRONIC INFLAMMATION:-
Defined as prolonged process in which tissue destruction and
inflammation occurs at the same time.
Chronic inflammation following acute inflammation:-
Tissue destruction is extensive or bacteria survive and persist in small
numbers at site of inflammation. Eg:-osteomyletis
Recurrent attacks of acute inflammation:-
When recurrent attacks of acute inflammation culminate to chronic
inflammation. Eg:-recurrent urinary tract infection leads to chronic
pyleronephritis.
Chronic inflammation starting denovo:-when the infection with
organisms persist from beginning eg:-infection with M.tubercle
36. GENERAL FEATURES OF CHRONIC INFLAMMATION:-
Mononuclear cell infiltration:-
Chronic inflammatory leison are infiltrated by mononuclear inflammatory
cells like phagocytes and lymphoid cells.
Phagocytes are represented by circulating monocytes
tissue macrophages
epitheloid cells
Macrophages comprise the most important cells of inflammation from
1.Chemotactic factors and adhesion molecules
2.Local proliferation of macrophages
3.Longer survival of macrophages at site of inflammation.
37. Blood monocytes reaching the extravascular space
transform into tissue macrophages
These macrophages may also get activated upon cytokines and bacterial
endotoxins.
On activation macrophages release cytokines,oxygen derived reactive metabolites
etc.
Tissue destruction or necrosis:-
This is brought by activated macrophages release biologically
active compounds
proteases elastases collagenses
38. Proliferative changes:-
As a result of necrosis proliferation of small blood vessels & fibroblasts
are stimulated and resulting in
formation of inflammatory granulation tissue
41. TYPES OF CHRONIC INFLAMMATION
Chronic non specific
inflammation
When the irritant substance
produces non specific chronic
inflammatory reaction with the
formation of granulation tissue
and healing of fibrosis.
Eg:-osteomyletis
Chronic granulomatous
inflammation
In this injurious agent causes
characteristic histolytic tissue
response by formation of
granules.
Eg:-Tuberculosis,leprosy etc.
42. GRANULOMATOUS INFLAMMATION
Granuloma is defined as tiny leision composed of collection of
modified macrophages called epitheloid cells and lymphoid cells.
Granule=circumscribed granule like leision
Oma=tumours
43.
44. PATHOGENESIS
1.engulfment by macrophages:-
Macrophages,monocytes are engulfed by antigen and destroy it.
But antigen poorly degradable
these cells fail to digest
and they transform into epitheloid cell.
45. 2.CD4+T cells:-
Macrophages present the antigen to CD4+T lymphocytes
these lymphocytes gets activated and release cytokines
{IL-1,IL-2,Interferon etc.}
46. Cytokines:-
Different cytokines formed perform different function:-
IL-1,IL-2 Stimulate proliferation of more T-cells.
INF-gamma activate macrophages.
TNF-alpha promotes fibroblast proliferation,activate
endothelium to secrete prostaglandin
Growth factors:- stimulate fibroblast growth.
47. COMPOSITION OF GRANULOMA
Epitheloid cells:-modified macrophages,elongated cells with slipper
like nucleus.
Nuclear chromatin is vesicular,cytoplasm becomes abundant,and they
are weakly phagocytic.
Multinucleate giant cells:-formed by fusion of abjacent eitheloid
cells.
Commonly seen in TB.
Lymphoid cells:-as a cell mediated immune reaction to antigen host
response is done by leukocyte. For humoral response it is done by
plasma cells.
48. Necrosis:-feature of granulomatous inflammation
Eg:-central casseous necrosis in TB.
Fibrosis:-feature of healing by proliferating fibroblast at periphery of
granuloma.