Alcoholic liver disease a brief insight- by Rxvichu! :)RxVichuZ
Hello my friends and peer readers.............................
With utmost humility and bliss, I present to you my 25th POWERPOINT PRESENTATION...published in GOOGLE SLIDESHARE..............................:) :)
Thanks to all readers and critics worldwide...for ur constant support................:)
Presenting infront of you all....my ppt on ALCOHOLIC LIVER DISEASE................
It contains precise information on the disease involved under ALD...Mainly CIRRHOSIS and STEATOSIS has been stressed upon.
Do go through the slides, and keep sharing your reviews and ideas....for better enhancement of my future works in the same......................
Keep reading well........
Always remember, that its more worthwhile to WORK SMART, than to WORK HARD!
Thank you!
Vishnu.R.Nair,
5th year pharm.D,
National College of Pharmacy,
Kerala University of Health Sciences(KUHS), Kerala, India.
:) :)
Alcoholic liver disease a brief insight- by Rxvichu! :)RxVichuZ
Hello my friends and peer readers.............................
With utmost humility and bliss, I present to you my 25th POWERPOINT PRESENTATION...published in GOOGLE SLIDESHARE..............................:) :)
Thanks to all readers and critics worldwide...for ur constant support................:)
Presenting infront of you all....my ppt on ALCOHOLIC LIVER DISEASE................
It contains precise information on the disease involved under ALD...Mainly CIRRHOSIS and STEATOSIS has been stressed upon.
Do go through the slides, and keep sharing your reviews and ideas....for better enhancement of my future works in the same......................
Keep reading well........
Always remember, that its more worthwhile to WORK SMART, than to WORK HARD!
Thank you!
Vishnu.R.Nair,
5th year pharm.D,
National College of Pharmacy,
Kerala University of Health Sciences(KUHS), Kerala, India.
:) :)
In this presentation i have tried to thoroughly discuss about the concept of Drug induced kidney disease or injury, the mechanism behind it, its classification and how to access it.
Gastroenteritis
One of the primary concerns related to gastrointestinal (GI)infection, regardless of the cause, is dehydration, which is the second leading cause of worldwide morbidity and mortality.
Worldwide, dehydration is especially problematic for children younger than age 5.
However, the highest rate of death occurs among the elderly.
Rehydration is the foundation of therapy for GI infections, and oral rehydration therapy (ORT) is usually preferred.
Gastroenteritis, also known as infectious diarrhea and gastro, is inflammation of the gastrointestinal tract—the stomach and intestine.
Diarrhea is defined as the production of stool of abnormally loose consistency, usually associated with excessive frequency of defecation and excessive stool output.
Acute Diarrhea lasts 14 days or less.
Persistent Diarrhea lasts more than 14 days.
Chronic Diarrhea lasts more than 1 month.
In this presentation i have tried to thoroughly discuss about the concept of Drug induced kidney disease or injury, the mechanism behind it, its classification and how to access it.
Gastroenteritis
One of the primary concerns related to gastrointestinal (GI)infection, regardless of the cause, is dehydration, which is the second leading cause of worldwide morbidity and mortality.
Worldwide, dehydration is especially problematic for children younger than age 5.
However, the highest rate of death occurs among the elderly.
Rehydration is the foundation of therapy for GI infections, and oral rehydration therapy (ORT) is usually preferred.
Gastroenteritis, also known as infectious diarrhea and gastro, is inflammation of the gastrointestinal tract—the stomach and intestine.
Diarrhea is defined as the production of stool of abnormally loose consistency, usually associated with excessive frequency of defecation and excessive stool output.
Acute Diarrhea lasts 14 days or less.
Persistent Diarrhea lasts more than 14 days.
Chronic Diarrhea lasts more than 1 month.
Microbiology of E coli giving basic of Escherichia coli, its morphology, cultural and biochemical characteristics, Antigenic character, pathogenesis, laboratory diagnosis, prevention and control
Defined as inflammation of the mucous membrane of stomach and intestine usually causing nausea ,vomiting and diarrhea.
Gastro-intestinal infections represent a major public health and clinical problem worldwide. Many species of bacteria, viruses and protozoa cause gastro-intestinal infection.
• Amoebiasis is an infection of small intestine, which is caused by an protozoan called Entamoeba histolytica. It is simply called – Amoebic dysentery.
Basic discussion on Clinical and Microbiological Aspects of Food Poisoning caused by various bacteria, viruses, protozoa, and Fungi along with their clinical and laboratory diagnosis and basic management.
1- Understand the pathophysiologic mechanisms involved in chronic diarrhea.
2. Classification the causes of chronic diarrhea in resource-rich and resource-limited countries
3- Know how to evaluate a child who has chronic diarrhea
4. Know the therapies for the many causes of chronic diarrhea
"Diarrhoea-This is characterized by 3 or more watery schools per day or having more stools than is normal for that person. Almost everybody has diarrhoea at some point in their lives. Diarrhoea may be a cause of concern because it may cause the more life threatening dehydration. Mindheal homeopathy can help in the treatment of diarrhoea."/>
"Diarrhoea-This is characterized by 3 or more watery schools per day or having more stools than is normal for that person. Almost everybody has diarrhoea at some point in their lives. Diarrhoea may be a cause of concern because it may cause the more life threatening dehydration. Mindheal homeopathy can help in the treatment of diarrhoea."/>
"Diarrhoea-This is characterized by 3 or more watery schools per day or having more stools than is normal for that person. Almost everybody has diarrhoea at some point in their lives. Diarrhoea may be a cause of concern because it may cause the more life threatening dehydration. Mindheal homeopathy can help in the treatment of diarrhoea."/>
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
2. Definition
Gastroenteritis is
inflammation of the
gastrointestinal tract,
involving the stomach,
intestines, or both; usually
resulting in diarrhoea,
abdominal cramps, nausea
and possibly vomiting.
Gastroenteritis is frequently
termed "stomach flu" or
"gastric flu" because the
most frequent cause of
gastroenteritis is viral, but
influenza viruses (flu
viruses) do not cause
3. EPIDEMIOLOGY
Occurs worldwide
Fecal-oral route of transmission
Water common reservoir
Overcrowding & poor sanitation are risk
factors
Animals, insects may be source of infection
4. Diarrheal illnesses may be classified as
follows:
1. Osmotic diarrhoea, retention of water
in the large intestine as a result of an
accumulation of non-absorbable, water
soluble compounds. Ceases with
fasting, discontinue oral agents.
Causes – Purgatives like Magnesium
sulfate or Mg containing antacids
Especially associated with
excessive intake of Sorbitol and
Mannitol.
Generalised malabsorption
5. 2. Inflammatory (or mucosal) diarrhoea, damage to
intestinal mucosal cell leading to a loss of fluids and
blood.
Causes- Immunodeficiency
Shigella dysentery
Inflammatory conditions like UC and CD
3. Secretory diarrhoea, active intestinal secretion of fluids
and electrolytes as well as decreased absorption.
Large volume, painless, persists with fasting
Causes- Cholera enterotoxin, thermolabile E. coli
enterotoxin
Laxatives like docusate sodium
6. 4. Motility diarrhoea, increases
frequency of defecation due to
underlying diseases. Large volume,
signs of Malabsorption
Causes- DM – autonomic neuropathy
Hyperthyroid diarrhoea
IBS
8. ETIOLOGY
Etiologies include bacteria, viruses,
parasites, toxins, and drugs. (eg, metals,
plant substances).
Viruses
Four categories of viruses cause most
gastroenteritis:
rotavirus and calicivirus
(predominantly the norovirus [formerly
Norwalk virus]) cause the majority of viral
gastroenteritis, followed by astrovirus
and enteric adenovirus.
9. Rotavirus
is the most common cause of sporadic,
severe, dehydrating diarrhoea in young
children (peak incidence, 3 to 15 mo).
Rotavirus is highly contagious; most
infections occur by the fecal-oral route.
Adults may be infected after close
contact with an infected infant.
The illness in adults is generally mild.
Incubation is 1 to 3 days.
10. Astrovirus
Can infect people of all ages but
usually infects infants and young
children.
Infection is most common in winter.
Transmission is by the fecal-oral
route.
Incubation is 3 to 4 days.
11. Adenoviruses
Are the 4th most common cause of
childhood viral gastroenteritis.
Infections occur year-round, with a slight
increase in summer.
Children < 2 yr are primarily affected.
Transmission is by the fecal-oral route.
Incubation is 3 to 10 days.
In immunocompromised patients,
additional viruses (eg, cytomegalovirus,
enterovirus) can cause gastroenteritis.
12. Bacteria
The bacteria most commonly implicated
are
Salmonella
Campylobacter
Shigella
Escherichia coli (especially serotype
O157:H7)
13. Bacteria cause gastroenteritis by several mechanisms.
Certain species (eg, Vibrio cholerae, enterotoxigenic strains
of E. coli) adhere to intestinal mucosa without invading and
produce enterotoxins.
These toxins impair intestinal absorption and cause secretion
of electrolytes and water by stimulating adenylate cyclase,
resulting in watery diarrhoea.
Clostridium difficile produces a similar toxin when overgrowth
follows antibiotic use.
Some bacteria (eg, Staphylococcus aureus, Bacillus cereus,
Clostridium perfringens) produce an exotoxin that is ingested
in contaminated food. The exotoxin can cause gastroenteritis
without bacterial infection.
These toxins generally cause acute nausea, vomiting, and
diarrhoea within 12 h of ingestion of contaminated food.
Symptoms abate within 36 h.
14. Other bacteria (eg, Shigella, Salmonella, Campylobacter,
some E. coli subtypes) invade the mucosa of the small bowel
or colon and cause microscopic ulceration, bleeding,
exudation of protein-rich fluid, and secretion of electrolytes
and water.
The invasive process and its results can occur whether or not
the organism produces an enterotoxin. The resulting
diarrhoea contains WBCs and RBCs and sometimes gross
blood.
Salmonella and Campylobacter acquired through
undercooked poultry; unpasteurized milk is also a possible
source.
Campylobacter is occasionally transmitted from dogs or cats
with diarrhea.
Salmonella can be transmitted by undercooked eggs and by
contact with reptiles.
Shigella dysenteriae type 1 (not present in the US) produces
15. Several different subtypes of E. coli cause
diarrhoea.
Enterohemorrhagic E. coli
It produces Shiga toxin, which causes bloody
diarrhoea (hemorrhagic colitis).
Undercooked ground beef, unpasteurized milk and
juice, and contaminated water are possible
sources.
Person-to-person transmission is common in the
day care setting.
Hemolytic-uremic syndrome is a serious
complication.
16. Enterotoxigenic E. coli
produces two toxins (one similar to cholera toxin)
that cause watery diarrhoea.
This subtype is the most common cause of
traveler's diarrhoea.
Enteropathogenic E. coli
causes watery diarrhoea.
Once a common cause of diarrhoea outbreaks
in nurseries, this subtype is now rare.
17. Enteroinvasive E. coli
causes bloody or nonbloody diarrhoea,
Yersinia enterocolitica can cause
gastroenteritis or a syndrome that
mimics appendicitis.
It is transmitted by undercooked pork,
unpasteurized milk, or contaminated
water.
Several Vibrio species (eg.
V. parahaemolyticus) cause diarrhoea
after ingestion of undercooked seafood.
18. V. cholerae sometimes causes severe
dehydrating diarrhoea in the developing
world.
Listeria causes food-borne gastroenteritis.
Aeromonas is acquired from swimming in or
drinking contaminated fresh or brackish
water.
Plesiomonas shigelloides can cause
diarrhoea in patients who have eaten raw
shellfish or traveled to tropical regions of the
21. 1. Mucosal adherence
Most bacteria causing diarrhoea must first adhere to specific
receptors on the gut mucosa.
A number of different molecular adhesion mechanisms have been
elaborated; for example, adhesions at the tip of the pili or fimbriae
which protrude from the bacterial surface aid adhesion.
For some pathogens this is merely the prelude to invasion or toxin
production but others such as enteropathogenic Escherichia coli
(EPEC) cause attachment-effacement mucosal lesions on electron
microscopy (EM) and produce a secretory diarrhoea directly as a
result of adherence.
Adhere in an aggregative pattern with the bacteria clumping on the
cell surface and its toxin causes persistent diarrhoea.
Diffusely adhering E. coli (DAEC) adheres in a uniform manner
and may also cause diarrhoea seen in children.
22. 2. Mucosal invasion:
Invasive pathogens such as Shigella sp.,
enteroinvasive E. coli (EIEC) and
Campylobacter sp. penetrate into the intestinal
mucosa.
Initial entry into the mucosal cells is facilitated
by the production of ‘invasins’, which disrupt the
host cell cytoskeleton.
Subsequent destruction of the epithelial cells
allows further bacterial entry, which also causes
the typical symptoms of dysentery: low-volume
bloody diarrhoea, with abdominal pain.
23. 3. Toxin production :
Gastroenteritis can be caused by different types of
bacterial toxins:
Enterotoxins, produced by the bacteria adhering to
the intestinal epithelium, induce excessive fluid
secretion into the bowel lumen, leading to watery
diarrhoea, without physically damaging the mucosa,
e.g. cholera, enterotoxigenic E. coli (ETEC).
Some enterotoxins preformed in the food primarily
cause vomiting, e.g. Staph. aureus and Bacillus
cereus.
A typical example of this is ‘fried rice poisoning’, in
which B. cereus toxin is present in cooked rice left
standing overnight at room temperature.
Cytotoxins damage the intestinal mucosa and, in
some cases, vascular endothelium as well (e.g. E. coli)
24.
25. Viral pathophysiology
Viral spread from person to person occurs by fecal-oral
transmission of contaminated food and water.
Some viruses, like noroviruses, may be transmitted by an
airborne route.
Clinical manifestations are related to intestinal infection, but
the exact mechanism of the induction of diarrhoea is not
clear.
The most extensive studies have been done with rotavirus.
Rotaviruses attach and enter mature enterocytes at the tips of
small intestinal villi.
They cause structural changes to the small bowel mucosa,
including villus shortening and mononuclear inflammatory
infiltrate in the lamina propria
26. Rotavirus infections induce maldigestion of
carbohydrates, and their accumulation in the
intestinal lumen, as well as a malabsorption of
nutrients and a concomitant inhibition of water
reabsorption, can lead to a malabsorption
component of diarrhoea.
Rotavirus secretes an enterotoxin, NSP4, which
leads to a Ca2+ -dependent Cl- secretory
mechanism.
Morphologic abnormalities can be minimal, and
studies demonstrate that rotavirus can be
released from infected epithelial cells without
destroying them.
27. Pathophysiology of Parasite ind.
GE
Certain intestinal parasites, notably Giardia intestinalis
adhere to or invade the intestinal mucosa, causing
nausea, vomiting, diarrhoea, and general malaise.
The infection can become chronic and cause a
malabsorption syndrome.
It is usually acquired via person-to-person transmission
(often in day care centers) or from contaminated water.
Cryptosporidium parvum causes watery diarrhoea
sometimes accompanied by abdominal cramps,
nausea, and vomiting.
In healthy people, the illness is self-limited, lasting
about 2 wk.
In immunocompromised patients, illness may be
severe, causing substantial electrolyte and fluid loss.
Cryptosporidium is usually acquired through
contaminated water.
28. Other parasites that can cause
symptoms similar to those of
cryptosporidiosis include Cyclospora
cayetanensis and, in
immunocompromised patients, Isospora
belli, and a collection of organisms
referred to as microsporidia (eg,
Enterocytozoon bieneusi,
Encephalitozoon intestinalis).
Entamoeba histolytica (amebiasis) is a
common cause of subacute bloody
30. SYMPTOMS AND SIGNS
The condition is usually of acute onset,
normally lasting 1–6 days, and is self-
limiting.
◦ Nausea and vomiting
◦ Diarrhoea
◦ Anorexia
◦ Fever
◦ Headaches
◦ Abnormal flatulence
◦ Abdominal pain
◦ Abdominal cramps
◦ Melena
◦ Fainting and Weakness
◦ Heartburn
31. DIAGNOSIS
1. Clinical evaluation (MHx, Physical
examination)
◦ Findings suggestive of gastroenteritis
include
copious, watery diarrhoea
ingestion of potentially contaminated food
(particularly during a known outbreak)
untreated surface water
known GI irritant; recent travel;
or contact with similarly ill people.
32. 2. Stool testing in select cases
If a rectal examination shows occult blood or if watery
diarrhoea persists > 48 h, stool examination (fecal
WBCs, ova, parasites) and culture are indicated.
However, for the diagnosis of giardiasis or
cryptosporidiosis, stool antigen detection using an
enzyme immunoassay has a higher sensitivity.
Rotavirus and enteric adenovirus infections can be
diagnosed using commercially available rapid assays
that detect viral antigen in the stool, but these are
usually done only to document an outbreak.
All patients with grossly bloody diarrhoea should be
tested for E. coli O157:H7, as should patients with non
bloody diarrhoea during a known outbreak.
33. Specific cultures must be requested
because this organism (E.coli) is not
detected on standard stool culture
media.
Adults with grossly bloody diarrhoea
should usually have sigmoidoscopy with
cultures and biopsy.
Appearance of the colonic mucosa may
help diagnose amebic dysentery,
shigellosis, and E. coli O157:H7
infection, although ulcerative colitis may
cause similar lesions.
Patients with recent antibiotic use should
have a stool assay for C. difficile toxin.
34. GENERAL TESTS
Serum electrolytes
Blood Urea Nitrogen (BUN)
Creatinine should be obtained to
evaluate hydration and acid-base
status in patients who appear
seriously ill.
Complete Blood Picture (CBP) is
nonspecific, although eosinophilia may
indicate parasitic infection.
35. Treatment -
REHYDRATION
The treatment of cholera and other dehydrating diarrheal
diseases was revolutionized by the promotion of oral
rehydration solutions.
The efficacy of which depends on the fact that glucose-
facilitated absorption of sodium and water in the small
intestine remains intact in the presence of cholera toxin.
The World Health Organization recommends a solution
containing 3.5 g sodium chloride, 2.5 g sodium bicarbonate,
1.5 g potassium chloride, and 20 g glucose (or 40 g sucrose)
per liter of water.
Oral rehydration solutions containing rice or cereal as the
carbohydrate source may be even more effective than
glucose-based solutions, and the addition of L-histidine may
reduce the frequency and volume of stool output.
Patients who are severely dehydrated or in whom vomiting
precludes the use of oral therapy should receive IV solutions
such as Ringer's lactate.
36. Although most secretory forms of traveler's diarrhea—
usually due to enterotoxigenic and enteroaggregative E.
coli—can be treated effectively with rehydration,
bismuth subsalicylate, or antiperistaltic agents,
antimicrobial agents can shorten the duration of illness
from 3–4 days to 24–36 h.
Antibiotic treatment for children who present with
bloody diarrhea raises special concerns.
Laboratory studies of enterohemorrhagic E. coli strains
have demonstrated that a number of antibiotics induce
replication of Shiga toxin–producing lambdoid
bacteriophages, significantly increasing toxin production
by these strains.
Clinical studies have supported these laboratory results,
and antibiotics are not recommended for the
treatment of enterohemorrhagic E. coli infections in
children.
37. Loperamide should not be used by patients with fever
or dysentery; its use may prolong diarrhea in patients
with infection due to Shigella or other invasive
organisms.
The recommended antibacterial drugs are as follows:
Adults:
(1) A fluoroquinolone such as ciprofloxacin,
750 mg as a single dose or 500 mg bid for 3 days;
levofloxacin, 500 mg as a single dose or 500 mg qd for
3 days; or norfloxacin, 800 mg as a single dose or 400
mg bid for 3 days.
(2) Azithromycin, 1000 mg as a single dose
or 500 mg qd for 3 days.
(3) Rifaximin, 200 mg tid or 400 mg bid for 3
days (not recommended for use in dysentery).
38. Children:
Azithromycin, 10 mg/kg on day 1, 5
mg/kg on days 2 and 3 if diarrhea persists.
Alternative agent: furazolidone, 7.5
mg/kg per day in four divided doses for 5
days.
All patients should take oral fluids
(Electrolyte sachets, or flavored mineral
water) plus saltine crackers.
If diarrhea becomes moderate or severe, if
fever persists, or if bloody stools or
dehydration develops, the patient should
seek medical attention.