New technology called Electromagnetic Navigation Bronchoscopy® (ENB) that uses virtual bronchoscopy and real time 3-dimensional CT images that enable me to localize these peripheral lung nodules for diagnosis and treatment. This outpatient procedure is minimally invasive and therefore has a small risk of pneumothorax (2-3%) and its published diagnostic yield rates range from 67% - 86%
New technology called Electromagnetic Navigation Bronchoscopy® (ENB) that uses virtual bronchoscopy and real time 3-dimensional CT images that enable me to localize these peripheral lung nodules for diagnosis and treatment. This outpatient procedure is minimally invasive and therefore has a small risk of pneumothorax (2-3%) and its published diagnostic yield rates range from 67% - 86%
by
Dr. Khairul Hassan Jessy
MD (Chest Diseases)
Associate Professor, Respiratory Medicine
National Institute of Diseases of the Chest and Hospital (NIDCH)
Mohakhali, Dhaka.
A detailed discussion and description on fungal diseases and management. The focus is kept on those facts which frequently come across an intensivist but it is also important for the Internist.
by
Dr. Khairul Hassan Jessy
MD (Chest Diseases)
Associate Professor, Respiratory Medicine
National Institute of Diseases of the Chest and Hospital (NIDCH)
Mohakhali, Dhaka.
A detailed discussion and description on fungal diseases and management. The focus is kept on those facts which frequently come across an intensivist but it is also important for the Internist.
Management of Chronic Pulmonary Aspergillosis and IgE for the LaypersonGraham Atherton
Professor Denning summarises how we manage CPA at the National Aspergillosis Centre, what we have learned, what we are still learning.
Graham Atherton describes IgE and how it affects Aspergillosis
Impact of Aerosols on Respiratory Health of Dairy Workers and Residents Livin...LPE Learning Center
The full proceedings paper is at: http://www.extension.org/72843
Recent studies of large modern dairies have found that respiratory disease remains an important problem for dairy workers, contributing to lost time and high turnover. Exposure to high levels of organic dusts generated during milking, moving cows, feeding and other tasks has been associated with increased inflammation and decreased lung function resulting in chronic obstructive pulmonary disease (COPD) and asthma-like diseases. Much research into the cause of respiratory disease in agriculture has focused on the role of endotoxins - a chemical component of Gram-negative bacteria. Recent research suggests that other components of these dusts such as Gram-positive bacteria and fungi are also important. Many new workers adapt to these exposures, and new evidence suggests that individual behavior and genetic factors play a key role in explaining why some workers are more susceptible. In addition several new studies of communities living in the vicinity of dairies and other livestock operations have shown that low level exposure to bioaerosols containing endotoxins and other microbial components at a very young age may be protective against the development of asthma later in life, possibly through priming of the immune system. Dairy producers are faced with interpreting complex research that may appear to show conflicting results. This presentation will review and discuss research into the impact of aerosols on respiratory health of dairy workers and residents living near dairies - the findings and implications for dairy producers.
Analysis in to the Epidemiology and Pathophysiology of Respiratory Syncytial ...Pırıl Erel
Respiratory Syncytial Virus (RSV) places the heaviest clinical burden on paediatric wards in the UK and the US. It is in fact, a global issue with 3.4 million hospitalisations and approximately 66,000 deaths worldwide per annum (Bush et al., 2007) (Lambert et al., 2014). RSV is the leading cause, especially during the winter months, of severe respiratory infections in infants resulting in a rise in hospital admissions where 0.5-1% of infected babies die from respiratory failure. It is also a significant respiratory concern in the elderly population. (Agoti et al., 2014)
RSV has shown to have a willful ability to enter the host resulting in illness both by viral mechanisms and proteins encoded by RSV, dysregulating the synthesis of systemic immune response of the host. Alongside the infiltration of RSV, the heath status and genotype of the host will be a key factor in predetermining disease susceptibility and severity.
It is important to understand RSV has been implicated with further acute and chronic illnesses therefore by considering the epidemiology and pathophysiology of RSV treatment may be implicated during early stages which can influence possible outcomes in the future.
The Future of Allergy and Clinical Immunology Prof. G. Walter Canonica - Con...Juan Carlos Ivancevich
Prof.G.Walter Canonica
Allergy and Respiratory Diseases Clinic
DIMI-‐University of Genoa
Italy
Presidente Congreso SLaai 2015: Dr. Alfonso Cepeda Sarabia
Allergen Skin Test Reactivity and Eosinophilia in Adult Bronchial Asthmatic P...MatiaAhmed
Asthma affects more than 100 million people worldwide. lncreased morbidrty
include increased exposure to indoor allergens and environmental pollutants
agonist, under-use of anti-inflammatory mediators and limited education about healu' care
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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
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.
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
263778731218 Abortion Clinic /Pills In Harare ,sisternakatoto
263778731218 Abortion Clinic /Pills In Harare ,ABORTION WOMEN’S CLINIC +27730423979 IN women clinic we believe that every woman should be able to make choices in her pregnancy. Our job is to provide compassionate care, safety,affordable and confidential services. That’s why we have won the trust from all generations of women all over the world. we use non surgical method(Abortion pills) to terminate…Dr.LISA +27730423979women Clinic is committed to providing the highest quality of obstetrical and gynecological care to women of all ages. Our dedicated staff aim to treat each patient and her health concerns with compassion and respect.Our dedicated group ABORTION WOMEN’S CLINIC +27730423979 IN women clinic we believe that every woman should be able to make choices in her pregnancy. Our job is to provide compassionate care, safety,affordable and confidential services. That’s why we have won the trust from all generations of women all over the world. we use non surgical method(Abortion pills) to terminate…Dr.LISA +27730423979women Clinic is committed to providing the highest quality of obstetrical and gynecological care to women of all ages. Our dedicated staff aim to treat each patient and her health concerns with compassion and respect.Our dedicated group of receptionists, nurses, and physicians have worked together as a teamof receptionists, nurses, and physicians have worked together as a team wwww.lisywomensclinic.co.za/
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
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
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
2. OUTLINE
• HISTORICAL PERSPECTIVE
• EPIDEMIOLOGY
• PATHOGENESIS AND ETIOLOGY
• CLINICAL FEATURES
• DIAGNOSIS
• TREATMENT
3. HISTORICAL PERSPECTIVE
• Asthma and “aspergillosis” were first associated
by Renon in 1897
• 1st report of ABPA was published in 1952 by
Hinson and colleagues described 3 pts with
-recurrent episodes of “wheezy bronchitis”
-serum eosinophilia
-sputum production
-fever
-infiltrates on chest x-ray films.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
7. EPIDEMIOLOGY
• Later, Agarwal and associates estimated
overall prevalence of ABPA in asthmatic
populations at 12.9% (95% confidence interval
[CI] 7.9 to 18.9)
• Most authors appear to agree that
approximately 2% of asthmatic patients
• And 1% to 15% of CF patients develop ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
8. EPIDEMIOLOGY
• Usually manifesting between the third and
fourth decades of life.
• No gender predilection.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
9. Pathogenesis And Etiology
-Aspergillus is a ubiquitous fungus
-Widely in nature
-Decaying vegetable matter
-An opportunistic pathogen
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
11. Pathogenesis And Etiology
Aspergillus species
• Saprobic habitat
-Soil
-Plants
-Water
-Pepper
-Air
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
12. Pathogenesis And Etiology
Aspergillus species
• Mode of infection
-Inhalation of conidia
-Transfer to wound via contaminate tape
/bandages
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
13. Pathogenesis And Etiology
• Aspergillus species
• Growth at 37 C
• Binding to fibrinogen and laminin
• Secretion of elastase and proteases
• Catalase
• Gliotoxin(?)
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
14. Pathogenesis And Etiology
• Aspergillus species
• ABPA
• Sinusitis
• Aspergilloma
• Invasive aspergillosis
• Lung
• Brain
• Skin
• GI
• Heart
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
15. Oppotunistic mycosis
Aspergillus fumigatus
Aspergillus flavus
Aspergillus niger
Aspergillus terreus
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
17. the colonies of
Aspergillus
may be black,
brown, green,
yellow, white,
or other colors,
depending
upon the
species
Original uploader was Jankaan at nl.wikipedia
18. Aspergillus fumigatus.
Lactophenol cotton blue
preparation show conidial
head
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
19. Aspergillus terreus.
Lactophenol cotton
blue preparation
show conidial head
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
20. Aspergillus niger.in
lung lesion showing
both hyphae and
conidial head
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
21. Aspergillus in tissue showing
acute angle branching
septate hyphae
Dr. Patrick R. Murray et al Medical Microbiology;7 th edition 2012
22. Pathogenesis And Etiology
•Fungal spors(conidia) 2.5-3.5mm
are inhale in to the lower airway
& alveoli
• Aspergillus grows through the product
of hyphae from sprout
conidiophores
• Aspergillus secrete proteolytic enz.
•Adherence of conidia to resp. epith.
cells
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
23. Pathogenesis And Etiology
Adherence of conidia to respiratory epithelial cells
Cellular dysfunction
Initially cilial disruption
The fungal colony grows,
Hyphae are produced invade between & through
epithelial cells
Leading to substantial tissue disruption
• JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
24. Schematic representation of components of the host response to inhaled Aspergillus conidia.
Park S J , and Mehrad B Clin. Microbiol. Rev. 2009;22:535-551
25. Pathogenesis And Etiology
• Inhalation of fungal spores is ubiquitous
• Aspergillus colonization and infection only occur in some
patients
• Predisposing factors must enable Aspergillus proliferation
up to a high antigen burden.
• First, the breakdown of local nonspecific immunity (e.g.,
mucociliary clearance mechanisms) will likely render an
individual more susceptible to the adherence of spores to
the airway epithelium.
• Preexisting lung disease such as bronchiectasis, as occurs in
CF
• Other factors may include the viscous mucus layer present
in the airways of these patients.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
26. Figure 61-1 Pathogenesis of allergic bronchopulmonary aspergillosis
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
27. Figure 3 | Balancing protection and immunopathology in fungal infections:
a cooperative effort of the innate and adaptive immune systems
Luigina Romani,Nature Reviews Immunology 4, 11-24 (January) 2004)
29. Immune responses:Innate immune
response
• TLRs2, 4, and 9 are considered important for
immunity to Aspergillus species
• Chronic fungal sensitization model:mouse
• Human studies comparing ABPA patients with
healthy controls and asthma with fungal infection
did not support a TLR2 allele
• A single-nucleotide polymorphism (SNP) in TLR9,
a receptor-binding nonmethylated CpG motif,
was associated with an odds ratio of 2.5 for ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
31. Immune responses:Innate immune
response
• TLRs2, 4, and 9 are considered important for
immunity to Aspergillus species
• Chronic fungal sensitization model:mouse
• Human studies comparing ABPA patients with
healthy controls and asthma with fungal infection
did not support a TLR2 allele
• A single-nucleotide polymorphism (SNP) in TLR9,
a receptor-binding nonmethylated CpG motif,
was associated with an odds ratio of 2.5 for ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
32. Chronic fungal sensitization model
Wild type TLR2-def
delayed and attenuated bronchial hyperresponsiveness
to Aspergillus airway colonization,
with persistence of fungi longer than
delayed and attenuated bronchial
hyperresponsiveness to Aspergillus airway
colonization,
with persistence of fungi shorter than
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
33. Immune responses:Innate immune
response
• TLRs2, 4, and 9 are considered important for
immunity to Aspergillus species
• Chronic fungal sensitization model:mouse
• Human studies comparing ABPA patients with
healthy controls and asthma with fungal infection
did not support a TLR2 allele
• A single-nucleotide polymorphism (SNP) in TLR9,
a receptor-binding nonmethylated CpG motif,
was associated with an odds ratio of 2.5 for ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
34. SNP in TLR9, a
receptor-binding
nonmethylated CpG
motif, was associated
with an odds ratio of
2.5 for ABPA
Abul K. Abbas et al.Cellular&Molecular immunology;9 edition2012:55-88
35. Immune responses:Innate immune
response
-Responses to fungi may also be influenced by certain serum acute phase
reactants, the pentraxins.
-In particular in a mouse model of fungal asthma
“ in vitro stimulation of macrophages by serum amyloid protein (SAP) &
reinfusion”
“improved pulmonary outcomes ”
“modulation of macrophage function may be achieved by regulation
through SAP”
improved outcomes of Aspergillus infections.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
36. Table 4-3 Pattern Recognition Molecules of the Innate Immune System
Abul K. Abbas et al.Cellular&Molecular immunology;9 edition2012:55-88
37. Immune responses
• Some results suggest this may translate to
humans where specific SNPs in surfactant
proteins and mannose-binding lectin (MBL)
have been associated with both presence of
and protection from ABPA
• Depending on the distinct alleles and
genotype combinations of surfactant protein
A2 and MBL
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
38. Table 4-3 Pattern Recognition Molecules of the Innate Immune System
Abul K. Abbas et al.Cellular&Molecular immunology;9 edition2012:55-88
40. Figure 3 | Balancing protection and immunopathology in fungal infections:
a cooperative effort of the innate and adaptive immune systems
Luigina Romani,Nature Reviews Immunology 4, 11-24 (January) 2004)
42. Immune responses:Cellular immune
response
Garcia and colleagues
-Demonstrated different patterns of T cell
chemokine receptor expression
ABPA allergic asthmatic
patients
Non-ABPA allergic asthmatic
patients
After Aspergillus antigen
exposure
After Aspergillus antigen
exposure
Proliferating allergen-specific CD4+ T cells
downregulated the expression of CCR4 and
CXCR3 in vitro
T cell chemokine receptor were
upregulated in stimulated allergen-specific
T cells
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
43. Immune responses: Specific antibody
responses
• Gautum and associates used proteomics to
identify 16 allergens associated with Aspergillus
infection
• Another study demonstrated the relevance of the
Aspergillus antigen Asp f 34, showing that
#94% of the ABPA
#46% of the A. fumigatus–sensitized
individuals
***Asp f 34–specific serum IgE.***
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
44. Genetic associations with ABPA
Miller and coworkers
#demonstrated a higher prevalence of cystic
fibrosis transmembrane conductance regulator
(CFTR) mutations in ABPA patients than healthy
controls.
• In transgenic mice models the HLA-DR2
genotype, particularly DRB1 1503, appears to
convey enhanced susceptibility to the pulmonary
eosinophilic inflammation associated with ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
45. Genetic associations with ABPA
• Other specific associations with ABPA have
been found in
-IL-4 receptor polymorphisms
-IL-13 polymorphisms
-tumor necrosis factor-α polymorphisms
-IL-10 polymorphisms
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
46. CLINICAL FEATURES
• The first descriptions of the clinical
presentation of ABPA were of patients with
-severe asthma
-radiographic findings of pulmonary
consolidation or segmental lung collapse
- fever, malaise, and cough productive of
brown sputum.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
47. CLINICAL FEATURES
• Diagnosis of asthma is reported to occur in more than
90% of patients with ABPA, most with asthma for over
a decade
• Not all patients with ABPA will have asthma
• ABPA being highly prevalent in CF patients.
• Overall, ABPA occurs most often in patients with
-difficult-to-control asthma
-CF and atopy.
• Patients with asthma or CF who develop ABPA will
present with deterioration of the disease with
worsening of wheezing.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
48. CLINICAL FEATURES
• Typically, cough occurs with thick,brown
sputum or plugs of mucus with histologic
evidence of eosinophilic debris and Aspergillus
hyphae.
• Although rarely severe, hemoptysis is also
described.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
50. CLINICAL FEATURES
• Fever, weight loss, and fatigue are common in
individuals who develop ABPA
• Fever, weight loss, and fatigue should raise
suspicion of its presence when seen in
patients with asthma and CF.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
51. CLINICAL FEATURES
• Clinical picture is often accompanied by
typical radiologic findings
****central bronchiectasis****
• Not all patients develop permanent
pulmonary lesions
• Pulmonary parenchymal infiltrates on chest
radiography may disappear with treatment
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
52. CLINICAL FEATURES
• ABPA serologic (ABPA-S)
#milder form of the disease
#diagnosed in the absence of radiologic
abnormalities
• The range of lung features vary from the
presence
#clinical features with no pulmonary opacities
#clinical features with classic, dominantly central
bronchiectasis or end-stage fibrosis with
associated respiratory failure
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
54. a.Rosenberg M,
Patterson R,
Mintzer R, et al
1977
b.Schwartz HJ,
Greenberger PA
1991
c.Greenberger PA.
1994
d.Agarwal R,
Khan A, Gupta
D, et al
2010
55. BOX 61-1 DIAGNOSTIC CLASSIFICATIONS FOR ALLERGIC
BRONCHOPULMONARY ASPERGILLOSIS (ABPA)
PRIMARY AND SECONDARY CRITERIA
Primary
Asthma
Serum eosinophilia
Immediate skin reactivity to Aspergillus
Precipitins to Aspergillus
Elevated IgE
Pulmonary infiltrates (transient or fixed) Central bronchiectasis
• Secondary
Aspergillus fumigatus in sputum
Expectoration of brown plugs
Late skin reactivity to Aspergillus
Rosenberg M, Patterson R, Mintzer R, et al. Clinical and immunologic
criteria for the diagnosis of allergic bronchopulmonary aspergillosis. Ann
Intern Med 1977;86:405-14;
56. BOX 61-1 DIAGNOSTIC CLASSIFICATIONS FOR ALLERGIC
BRONCHOPULMONARY ASPERGILLOSIS (ABPA)
ABPA-CB/-S CLASSIFICATION
ABPA-CB: Minimal Essential Criteria ABPA-S: Minimal Essential Criteria
Asthma Asthma
Immediate skin test reactivity to Aspergillus Immediate skin test reactivity to Aspergillus
Elevated total IgE (1000 ng/mL) Elevated total IgE (1000 ng/mL)
Proximal bronchiectasis Elevated Aspergillus-specific IgE and/or IgG
Additional Criteria
Current or previous pulmonary infiltrates
Mucus plugs
Presence of Aspergillus in sputum
Precipitins to Aspergillus
Delayed skin test positive
Eosinophilia (>1000/μL)
Schwartz HJ, Greenberger PA. The prevalence of allergic bronchopulmonary aspergillosis in patients
with asthma, determined by serologic and radiologic criteria in patients at risk. J Lab Clin Med
1991;117:138-42;
Greenberger PA. Diagnosis and management of allergic bronchopulmonary aspergillosis. Allergy
Proc 1994;15:335-9;
57. BOX 61-1 DIAGNOSTIC CLASSIFICATIONS FOR ALLERGIC
BRONCHOPULMONARY ASPERGILLOSIS (ABPA)
AGARWAL CLASSIFICATION
Patients Diagnosed with ABPA if They Meet Both of the
Following Criteria:
1. Total IgE levels >1000 ng/mL
2. Aspergillus fumigatus–specific IgE levels >0.35 kUA/L
And Two of the Following Criteria:
1. Presence of serum precipitins against A. fumigatus
2. Radiographic pulmonary opacities (fixed/transient)
3. Absolute blood eosinophil count >1000 cells/μL
4. Central bronchiectasis on HRCT
Agarwal R, Khan A, Gupta D, et al. An alternate method of classifying
allergic bronchopulmonary aspergillosis based on high-attenuation mucus.
PLoS One 2010;5
58. DIAGNOSIS
-Fungal airways disease caused by Aspergillus
may represent a continuum
colonization of the
airway severe fibrosis
airway immunologic
reactions to the fungus
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
59. DIAGNOSIS
Differential Diagnosis
• Severe asthma with fungal sensitization”
(SAFS)
• Pulmonary infiltrates from bacterial or viral
pneumonia in the setting of SAFS
• Impaired lung function in those with severe
asthma who have coexistent fungal
sensitization
60. DIAGNOSIS
Differential Diagnosis
• Serum total IgE is higher than 1000 ng/mL
(417 IU/mL) in ABPA patients.
• The levels between 500 and 1000 ng/mL
should be closely monitored for development
of ABPA, with follow-up IgE levels monitored
every 6 weeks.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
61. DIAGNOSIS
Cystic fibrosis
-Recognition of ABPA is complicated by the usual
concomitant bronchiectasis, with variable
presence of asthma.
-Frequent colonization of airways with
Aspergillus species elevation of serum
total IgE and problems with coexistent fungal
sensitization
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
62. JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
63.
64. Skin Testing&Laboratory Investigations
• Absence of sensitivity to Aspergillus effectively
excludes ABPA, except in rare individuals
• Absence of reactivity to Aspergillus antigens
makes a diagnosis of ABPA extremely unlikely,
• Prevalence of fungal sensitization has been
reported as high as 66% in severely asthmatic
patients, with sensitivity to Aspergillus of 45%.
• Indicating that both blood and skin testing should
be performed to ascertain fungal sensitization.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
65. Skin Testing&Laboratory Investigations
Aspergillus Skin Test:
• The Aspergillus skin test is performed using
an A fumigatus antigen
-Commercial (eg, Aspergillin; Hollister-Stier
Laboratories; Spokane, WA)
-Locally prepared.
Ritesh Agarwal, CHEST / 135 / 3 / MARCH, 2009
66. Skin Testing&Laboratory Investigations
Aspergillus Skin Test:
The test is read every 15 min for 1 h, and then after 6 to 8 h.
** The reactions are classified as**
Type I reaction
if a wheal and erythema developed within 1 min, reaches a
maximum after 10 to 20 min, and resolves within 1 to 2 h.
Type III reaction
read after 6 h, and any amount of subcutaneous edema is
considered a positive result.
Ritesh Agarwal, CHEST / 135 / 3 / MARCH, 2009
67. Skin Testing&Laboratory Investigations
Aspergillus Skin Test:
An immediate cutaneous hypersensitivity to A fumigatus antigens
“ is a characteristic finding of ABPA and represents the presence A
fumigatus specific IgE antibodies”
A type III skin reaction
“probably represents the immune complex hypersensitivity
reaction, although its exact significance remains unclear. “
Ritesh Agarwal, CHEST / 135 / 3 / MARCH, 2009
68. Skin Testing&Laboratory Investigations
• More than 80 allergens of Aspergillus have been
identified in humans.
• Asthma & CF, reactivity to the antigens Asp f 1, 3, 4 & 6
• Pts with asthma appear to recognize Asp f 1 and 3,
• Both asthma & CF Pts, the presence of antibodies to
either Asp f 4 or Asp f 6 has been associated with high
sensitivity and specificity for ABPA.
• The use of recombinant antigens for testing
#not currently routine
#but may improved diagnostic rigor.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
69. Skin Testing&Laboratory Investigations
• ABPA is highly elevated serum total IgE level.
• Agawal and coworkers proposed a threshold
of 1000 IU/mL as a criterion for ABPA
diagnosis.
• Not all agree with such a high threshold
• Total IgE may be even lower in some patients,
(being treated with corticosteroids.)
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
70. Skin Testing&Laboratory Investigations
• Many patients have very high levels of total IgE, (>10,000
IU/mL).
• The most sensitive indicator of disease progression is serial
measurements of total IgE showing increasing levels of IgE.
• A decline in serum total IgE of 35% is considered diagnostic
of achieving remission of ABPA.
• A doubling of serum total IgE is considered diagnostic of
relapse of ABPA, especially in CF patients.
• Oral corticosteroids will reduce blood IgE levels and also
need consideration.
71. Skin Testing&Laboratory Investigations
• Precipitating antibodies to Aspergillus by gel
diffusion
#Predominantly of the IgG class
#Occasionally IgE and IgA
• Precipitating antibodies may also be
detectable in several fungal pulmonary
dis.:Aspergilloma
73. Skin Testing&Laboratory Investigations
• The presence of Aspergillus, particularly hyphae in the
sputum, also suggests ABPA.
• Aspergillus colonization of the airways may occur without
sufficient criteria to diagnose ABPA and is also present in
invasive fungal infections in the lung.
• Curschmann spirals and eosinophilic debris (e.g., Charcot-
Leyden crystals) may be found in the sputum of ABPA
patients, indicating inflammatory airway response
• These findings can be seen in asthmatic patients without
ABPA as well.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
76. Radiologic Findings
**Fleeting parenchymal pulmonary opacities**
*Pulmonary opacities frequently manifest in
those with ABPA-S but without overt evidence
of symptoms*
*May be confused with persistent pneumonia*
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
77. Radiologic Findings
•Once large airways are
involved
• Transitory opacities
•Thickened airway walls
•Central bronchiectasis
•Mucus plugging
atelectasis
•More significant
pulmonary collapse
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
79. Radiologic Findings
HRCT:Lung Parenchymal Changes
lung opacity Lung collapse Parenchymal
Transient parenchymal
scaring
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
80. Radiologic Findings
HRCT:Airways Changes
Bronchiectasis involving large central airways with a predilection for the upper
lobes are diagnostic of ABPA.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
81. Radiologic Findings
-Bronchiectasis at lobar & segmental levels and
involving the majority of airways is characteristic.
-Severe asthma can also be associated with
bronchiectasis on CT
( not exceed two lobes, as typically occurs in ABPA)
-Mucoid impaction leading to airway collapse
-“Tree-in-bud” opacities is also described.
-Severe central bronchectasis will also give rise to
more peripheral bronchiectasis & the fibrosis
associated with end-stage disease.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
82. JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
83. Histopathologic Findings
• Inflammatory infiltration of the airways by
eosinophils and lymphocytes
• Globlet cell hyperplasia
• Granulomas with distal exudative bronchiolitis
• Mucoid impaction
• End-stage disease:fibrosis
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
84. Histopathologic Findings
• Pathologic samples are not required for the
diagnosis of ABPA
• The detection of Aspergillus in lung tissue
when lung biopsy is performed is useful
because it supports the diagnosis.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
85. The bronchi of this resected lobe are markedly distended with mucous. This is a
manifestation of allergic bronchopulmonary aspergillosis
86. Mucin admixed with degenerating eosinophiles (allergic mucin) with
multiple Charcot-Leyden crystals. This is a manifestation of allergic
bronchopulmonary aspergillosis
87. The bronchi are markedly distended with mucous. This is a manifestation of allergic
bronchopulmonary aspergillosis
88. This bronchus is markedly distended with mucous. This
is a manifestation of allergic bronchopulmonary
aspergillosis
89. Fig. 6. Protocol for investigating allergic bronchopulmonary aspergillosis(ABPA) in patients with asthma.
Ritesh Agarwal et al, Clinical & Experimental Allergy,2013; 43 : 850–873
93. TREATMENT
• Corticosteroid
• Antifungal Agents
• Anti-IgE Biologics
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
94. AIM
• Improve clinical symptoms of disease
• Reduce exacerbations
• Prevent progression of disease to central
bronchiectasis.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
95. CORTICOSTEROID
• Oral corticosteroids are the basis of therapy
for patients with ABPA.
• Serum total IgE is used to monitor disease
activity.
• Initial recommended treatments for ABPA
were at least 3 months.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
96. CORTICOSTEROID
Prednisone 0.5 mg/kg every day
for 2 weeks
Prednisone 0.5 mg/kg alternate days
for 3 months
Staging of disease &
Repeat level of serum total IgE
for monitor disease activity
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
97. CORTICOSTEROID
• Larger cohorts indicated use of higher doses of
corticosteroids for longer duration to prevent
disease relapse.
• No controlled data compare dosage regimens.
• More recent studies
-higher-dose regimens
-with duration of treatment determined by
serologic and clinical response
-in particular aiming for a 35% reduction in
serum total IgE to reduce the risk of relapse
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
98. CORTICOSTEROID
0.75 mg/kg/day for 6 weeks
0.5 mg/kg/day for 6 weeks
then reduction of 5 mg/day every 6
weeks, with 6 to 12 mnth of tx
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
99. CORTICOSTEROID
• Lung damage can occur even in the absence of
symptoms.Monitor serum total IgE levels
every 1 to 2 months
• Increase corticosteroid dosing if IgE levels
double from the baseline values obtained
after stability on the maintenance dose.
• Alternate-day regimens may be an option for
subjects who cannot be tapered off
corticosteroids completely.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
100. CORTICOSTEROID
• Acute exacerbations should be treated with
Prednisone 0.5 to 1.0 mg/kg/day for 1
to 2 weeks
Prednisolone 0.5 mg/kg/day for 6 to
12 weeks on clinical remission
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
101. CORTICOSTEROID
*Monthly pulsed methylprednisolone regimen*
3 days of 10 to 15 mg/kg/day repeated every
month
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
102. CORTICOSTEROID
• Methyl prednisolone with itraconazole
demonstrated effective reduction of serum
total IgE and improvement in symptoms.
• Methylprednisolone with itraconazole has
been used in patients with CF as well.
• High-dose intravenous corticosteroid
treatments have also been used in life-threatening
situations involving ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
103. CORTICOSTEROID
• A study of budesonide and formoterol
inhalation therapy in 21 patients with ABPA-S
ABPA-s with Progressive elevation
of serum IgE
Responded to oral corticosteroids,
with reduction in
total IgE levels
budesonide &formoterol
6 months
no pt used
antifungal therapy
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 2013:1000-13
105. 19%
46%
Stevens and associates showed symptomatic improvement
decreased corticosteroid requirement in 46% of those receiving 200 mg of itraconazole
twice daily
versus 19% in the placebo group.
Steven DA,et al N Engl J Med 2000;342:756-62
106. Placebo
Itraconazole
Wark and colleagues
showed reduced sputum eosinophil counts in both patients with ABPA-S and
patients with ABPA-CB in remission, using daily itraconazole(400 mg/day for 16
wks)
Wark PAB et al, J Allergy Clin Immunol 2003;111:952-7
107.
108. Limper AH et al .An official American Thoracic Society statement: treatment of fungal infections in adult pulmonary and critical care patients. Am J Respir Crit Care Med 2011;183:96-12
Limper AH et al .An official American Thoracic Society statement: treatment of fungal infections in adult pulmonary Limper AH et al .An official American Thoracic Society statement: treatment of fungal
infections in adult pulmonary and critical care patients. Am J Respir Crit Care Med
2011;183:96-128
109. Limper AH et al .An official American Thoracic Society statement: treatment of fungal infections in adult pulmonary and critical care patients. Am J Respir Crit Care Med 2011;183:96-12
The apparent consensus is that itraconazole, 200 mg twice
daily for 6 months, should be offered for these patients
Limper AH et al .An official American Thoracic Society statement: treatment of fungal infections in adult pulmonary Limper AH et al .An official American Thoracic Society statement: treatment of fungal
infections in adult pulmonary and critical care patients. Am J Respir Crit Care Med
2011;183:96-128
110. Antifungal Agents
• Voriconazole has been used as an alternative
antifungal agent and was effective in a case
series.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
111. Antifungal Agents
• Azoles are strong inhibitors of the cytochrome
P450–dependent CYP3A4 enzyme involved in the
metabolism of budesonide and other
corticosteroids.
• Adrenal suppression has been demonstrated by
the ACTH stimulation test in pts receiving inhaled
corticosteroids and itraconazole.
• Some of the benefit of adjunctive azole therapy in
ABPA might be caused by the relatively higher
dose of bioavailable corticosteroid.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
112. Anti-IgE Biologics
• Key role of IgE in the pathology of ABPA
• Effectiveness of anti-IgE treatments in asthma
• Anti-IgE therapy has been tried in ABPA.
• Recommended dose range of IgE for which
omalizumab has proved effective is frequently
exceeded in patients with ABPA
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
113. Anti-IgE Biologics
• Uncontrolled case series report effective use
of omalizumab in
#ABPA patients
#Corticosteroid-dependent CF patients
• Others report the effective use of omalizumab
with corticosteroids in life-threatening
respiratory failure caused by ABPA.
• Second-line option for ABPA in patients with
and without CF.
JO A. DOUGLASS et al .Middleton’s allergy ; 8th edition 013:1000-13
114. Take home message
• Patients with well-treated but uncontrolled asthma should
be screened for allergic bronchopulmonary aspergillosis.
• Diagnostic criteria for ABPA include asthma, increased total
IgE levels, positive skin testing to Aspergillus fumigatus,
increased specific IgE to Aspergillus, and central
bronchiectasis (may be absent in ABPA serologic).
• First-line therapy for ABPA is systemic corticosteroids; the
antifungal itraconazole or voriconazole may be considered
as an alternative, corticosteroid-sparing agent.
Schematic representation of components of the host response to inhaled Aspergillus conidia. PMN, polymorphonuclear leukocytes.
Most fungi are detected and destroyed within hours by innate defence mechanisms mediated by phagocytes and
opsonins through the involvement of distinct pattern-recognition receptors (PRRs). These mechanisms act immediately and are
followed some hours later by an early induced inflammatory response, which must be activated by infection but does not generate
lasting protective immunity. These early phases help to keep infection under control. In vertebrates, however, if the infectious organism
can breach these early lines of defence, an adaptive immune response will ensue, with the generation of antigen-specific T helper (TH)
effector cells, regulatory T (TReg) cells and B cells that specifically target the pathogen and induce memory cells that prevent subsequent
infection with the same microorganism. Dendritic cells sample fungi at the site of colonization/infection, transport them to the draining
lymph nodes and activate disparate TH and TReg cells in a morphotype- and tissue-dependent manner. As the different TH-cell subsets
release a distinct panel of cytokines, capable of delivering activating and inhibitory feedback signals to effector phagocytes, the
activation of the appropriate TH-cell subset is instrumental in the generation of a successful immune response to fungi. Counterregulatory
TReg cells might serve to dampen the excessive inflammatory reactions and contribute to the development of memory
antifungal immunity. Solid and broken lines refer to positive and negative signals, respectively. IFN-γ, interferon-γ; IL, interleukin; TCR,
T-cell receptor; TGF-β, transforming growth factor-β; TNF, tumour-necrosis factor
Charcot–Leyden crystals are microscopic crystals found in people who have allergic diseases such as asthma or parasitic infections such as parasitic pneumonia or ascariasis.
The Charcot-Leyden crystal protein interacts with eosinophil lysophospholipases.[1]