Vesiculobullous Disorders Overview

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Questions and Answers

Which of the following is the most common subepidermal autoimmune blistering disease?

  • Bullous pemphigoid (correct)
  • Epidermolysis bullosa acquisita
  • Pemphigoid gestationis
  • Linear IgA disease

Which antibody is considered to be pathogenic in bullous pemphigoid?

  • Antibodies to BP230/BPAG1
  • Antibodies to type IV collagen
  • IgG antibodies to BP180/BPAG2/type XVII collagen (correct)
  • IgA antibodies

What is the typical age demographic affected by bullous pemphigoid?

  • Children under 10 years of age
  • Young adults between 20-30 years of age
  • Individuals with a family history of the condition
  • Older adults, typically over 60 years of age (correct)

Which of the following is a common clinical presentation of non-bullous bullous pemphigoid?

<p>Pruritus and eczematous lesions (A)</p> Signup and view all the answers

What is a typical characteristic of the bullae in the classic presentation of bullous pemphigoid?

<p>Tense bullae on normal or erythematous skin (A)</p> Signup and view all the answers

What is a common symptom associated with bullous pemphigoid?

<p>Severe Pruritus (A)</p> Signup and view all the answers

When does pemphigoid gestationis typically begin during pregnancy?

<p>Second trimester (C)</p> Signup and view all the answers

Which of the following is considered a standard initial therapy for moderate to severe Pemphigus vulgaris?

<p>Rituximab in combination with oral steroids (B)</p> Signup and view all the answers

Besides pregnancy, what other factors can cause a flare-up of pemphigoid gestationis?

<p>Menstruation and oral contraceptive use (D)</p> Signup and view all the answers

What is the primary role of oral immunosuppressants in the treatment of Pemphigus vulgaris?

<p>To provide steroid-sparing long-term therapy and induce remission. (A)</p> Signup and view all the answers

What was the life expectancy of a patient with Pemphigus Vulgaris before prednisone treatment was available?

<p>Less than or equal to 5 years (D)</p> Signup and view all the answers

Which of these is NOT classified as a subtype of pemphigus?

<p>Pemphigus gangrenosum (D)</p> Signup and view all the answers

What is the primary enzyme associated with Dermatitis Herpetiformis (DH)?

<p>Tissue transglutaminase 3 (D)</p> Signup and view all the answers

What percentage of patients treated with Rituximab achieve remission off steroids after 2 years of treatment?

<p>90% (D)</p> Signup and view all the answers

Which of the following is the most common presenting symptom in patients newly diagnosed with DH?

<p>Symmetric grouped/herpetiform lesions (C)</p> Signup and view all the answers

What is the typical distribution pattern of skin lesions in Dermatitis Herpetiformis (DH)?

<p>Elbows, knees, extensor forearms, back &amp; buttocks (B)</p> Signup and view all the answers

Which of the following is considered a very long-term side effect of Oral steroid use?

<p>Erosion of bone (C)</p> Signup and view all the answers

What is the most direct treatment for patients with pemphigus that are only showing minimal symptoms?

<p>Ultra-potent topical steroids (D)</p> Signup and view all the answers

Which blood test is most specific for diagnosing DH?

<p>IgA anti-endomysial antibodies (B)</p> Signup and view all the answers

Which is most associated with Pemphigus Vulgaris?

<p>Pemphigus vegetans (C)</p> Signup and view all the answers

What is the primary treatment for the underlying cause of Dermatitis Herpetiformis (DH)?

<p>Gluten-free diet (B)</p> Signup and view all the answers

Which medication provides rapid relief from pruritus associated with Dermatitis Herpetiformis (DH)?

<p>Dapsone (C)</p> Signup and view all the answers

What is a crucial prerequisite to assess before beginning treatment with dapsone for Dermatitis Herpetiformis?

<p>G6PD deficiency (B)</p> Signup and view all the answers

What best describes the nature of intestinal symptoms in Dermatitis Herpetiformis (DH)?

<p>They are present in a minority of patients at diagnosis. (A)</p> Signup and view all the answers

Which of the following is the most common variant of pemphigus?

<p>Pemphigus vulgaris (D)</p> Signup and view all the answers

Pemphigus vulgaris is characterized by autoantibodies targeting which of the following?

<p>Desmoglein 3 ± desmoglein 1 (D)</p> Signup and view all the answers

Which of the following is a typical clinical presentation of pemphigus vulgaris?

<p>Painful oral erosions and flaccid bullae that rupture easily (C)</p> Signup and view all the answers

Which of the following is the most appropriate medium to send a biopsy for direct immunofluorescence in the diagnosis of pemphigus?

<p>Michel's medium (D)</p> Signup and view all the answers

Which of the following serological tests is highly sensitive and specific for circulating desmoglein 3 antibodies, often used in the diagnosis of pemphigus vulgaris?

<p>Enzyme-linked immunosorbent assay (ELISA) (A)</p> Signup and view all the answers

Which of the following is a medication that is more likely to induce pemphigus foliaceus?

<p>Penicillamine (B)</p> Signup and view all the answers

Which of the following best describes the demographic at highest risk of developing pemphigus vulgaris?

<p>Older adults (50-60s) with Jewish ancestry (D)</p> Signup and view all the answers

Which of the following statements regarding skin findings in pemphigus vulgaris is correct?

<p>The skin has non-scarring erosions from ruptured vesicles. (D)</p> Signup and view all the answers

A mother with bullous pemphigoid may have an increased risk for which of the following conditions?

<p>Graves' disease (B)</p> Signup and view all the answers

Which of the following is a common medication associated with bullous pemphigoid?

<p>Lisinopril (D)</p> Signup and view all the answers

What is the preferred medium to transport a skin biopsy for direct immunofluorescence (DIF) in the diagnosis of bullous pemphigoid?

<p>Michel's medium (B)</p> Signup and view all the answers

Which of the following statements about ELISA testing for bullous pemphigoid is correct?

<p>ELISA has a high specificity of ≥ 90%. (B)</p> Signup and view all the answers

For mild and localized bullous pemphigoid, what is generally considered the first-line treatment?

<p>Topical steroids (A)</p> Signup and view all the answers

What is a common risk factor for relapse of bullous pemphigoid after cessation of treatment?

<p>High-titer ELISA at time of therapy cessation (C)</p> Signup and view all the answers

Which of the following best describes the typical course of bullous pemphigoid?

<p>Marked by spontaneous exacerbations and remissions. (B)</p> Signup and view all the answers

Dermatitis herpetiformis is associated with which underlying condition?

<p>Celiac disease (C)</p> Signup and view all the answers

Flashcards

Bullous Pemphigoid

A common subepidermal blistering disease affecting older adults and is frequently associated with neurological issues.

What are the primary target antigens in Bullous Pemphigoid?

Autoantibodies mainly against BP180 and BP230 are characteristic of this disease.

Pemphigoid Gestationis

A blistering disease affecting pregnant women, often starting during the second trimester.

What are the clinical features of Pemphigoid Gestationis?

This disease is characterized by pruritic urticarial plaques and tense bullae, often flaring around delivery or during menstruation.

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Which antibody is primarily responsible for the pathogenesis of Bullous Pemphigoid?

Anti-BP180 antibodies trigger the pathogenic mechanisms of Bullous Pemphigoid.

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Can Bullous Pemphigoid be medication-induced?

This disease can be triggered by certain medications, highlighting the importance of considering medication history.

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Which HLA allele is associated with Bullous Pemphigoid?

HLA-DQB1*0301 is associated with increased risk of developing Bullous Pemphigoid.

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Describe the classic presentation of Bullous Pemphigoid.

Bullous Pemphigoid often presents with tense blisters on normal or erythematous skin and may involve the oral mucosa.

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Pemphigus Vulgaris

Autoimmune blistering disease targeting desmoglein 3, a protein that holds skin cells together.

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Nikolsky's Sign

A sign of pemphigus vulgaris where a gentle pressure on the skin causes blistering due to the loss of cell-to-cell adhesion.

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Asboe-Hansen Sign

A sign of pemphigus vulgaris where a gentle pressure on the mucous membrane causes blistering due to the loss of cell-to-cell adhesion.

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Indirect Immunofluorescence (IIF)

A test where a patient's serum is exposed to a monkey esophagus, and a fluorescent dye is used to detect antibodies against desmoglein 3. This helps diagnose pemphigus vulgaris.

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ELISA (Enzyme-linked Immunosorbent Assay)

A blood test that measures the amount of antibodies against desmoglein 3 in the blood. This helps monitor disease activity in pemphigus vulgaris.

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Biopsy

A method of preparing a sample of skin for microscopic examination. This helps diagnose pemphigus vulgaris.

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Direct Immunofluorescence (DIF)

A technique used to detect antibodies against desmoglein 3 in the skin. This helps diagnose pemphigus vulgaris.

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Pemphigus Foliaceus

A type of pemphigus where the antibodies target desmoglein 1, the protein that holds cells in the outer layer of the skin together. This results in scaly, red lesions mainly on the skin.

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What is the cause of Bullous Pemphigoid?

Immune system mistakenly targets the basement membrane of the skin, causing separation and blister formation.

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What are the clinical features of Bullous Pemphigoid?

Commonly observed in elderly individuals, and symptoms include large fluid-filled blisters, often starting near the umbilicus.

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What is H&E biopsy in Bullous Pemphigoid diagnosis?

A type of skin biopsy that involves staining with hematoxylin and eosin. Used to examine tissue structure.

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What is Indirect Immunofluorescence (IIF)?

A test that uses fluorescent antibodies to detect specific antibodies in the blood. Used to diagnose Bullous Pemphigoid.

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What is the first-line treatment for mild to moderate Bullous Pemphigoid?

First-line treatment for mild to moderate Bullous Pemphigoid involves topical corticosteroids.

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What are second-line treatments for Bullous Pemphigoid?

Second-line treatments for Bullous Pemphigoid include oral steroids, immunosuppressants, and intravenous immunoglobulin (IVIg).

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Dermatitis Herpetiformis

A chronic skin condition that causes itchy, blistering, and papular eruptions. Commonly associated with Celiac disease.

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IgA anti-endomysial antibodies

A specific type of antibody found in the blood of most people with Dermatitis Herpetiformis and Celiac Disease.

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IgA anti-tissue transglutaminase 2 antibodies

A type of antibody that can be tested for in the blood, but not always present in people with Dermatitis Herpetiformis.

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IgA anti-tissue transglutaminase 3 antibodies

A type of antibody specific to the skin condition Dermatitis Herpetiformis, detected in the blood.

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Dapsone

A medication used to treat the skin symptoms of Dermatitis Herpetiformis. It provides quick relief from itching.

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Gluten-free diet

A vital step in managing Dermatitis Herpetiformis. It often takes several months to see improvements.

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Skin biopsy with direct immunofluorescence

The gold standard for diagnosing Dermatitis Herpetiformis. It involves examining a skin sample under a microscope.

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Extensor surfaces of the body

The most common site for Dermatitis Herpetiformis lesions, often seen on the elbows, knees, and back.

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Pemphigus Vulgaris Treatment: Initial Therapy

Oral corticosteroid therapy (usually prednisone) is the standard of care for Pemphigus Vulgaris, typically in doses around 1 mg/kg per day.

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Pemphigus Vulgaris Treatment: Long-Term Management

Immunosuppressants like mycophenolate, azathioprine, or cyclophosphamide are often used to reduce steroid dependence and maintain remission in Pemphigus Vulgaris. These drugs help control the immune system's attack on skin cells.

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Pemphigus Vulgaris Treatment: Rituximab

Rituximab, an antibody that targets B-cells, is a standard initial treatment for moderate to severe Pemphigus Vulgaris when the disease is refractory (doesn't respond to other treatments), rapidly progressing, or a threat to organ function. It often works alongside oral steroids.

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Pemphigus Vulgaris Prognosis: Impact of Treatment

Pemphigus Vulgaris is a serious disease. Before the advent of prednisone, people with this condition had a life expectancy of less than 5 years. Now, thanks to effective treatments, the mortality rate is much lower (5-15%).

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Types of Pemphigus: Classification

Pemphigus Vulgaris is the most common form of pemphigus, but there are other types as well. These include Pemphigus vegetans, Pemphigus foliaceus, Pemphigus erythematosus, Fogo selvagem, drug-induced pemphigus, paraneoplastic pemphigus, and IgA pemphigus.

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Pemphigus Vegetans

Pemphigus vegetans is a unique variant of Pemphigus Vulgaris characterized by vegetating plaques, often in the groin and axillae.

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Fogo Selvagem

Fogo selvagem is a type of Pemphigus foliaceus that predominantly occurs in Brazil.

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Study Notes

Vesiculobullous Disorders

  • Vesiculobullous disorders are a group of skin conditions characterized by blisters.
  • Adherens junctions and desmosomes are cell-to-cell junctions, important for skin integrity. Desmosomes use keratin, cadherin, plakoglobin, desmoglein, desmocollin, plakophilin, and desmoplakin.
  • Pemphigus is an autoimmune blistering disease. Different types exist, including vulgaris, vegetans, foliaceus, erythematosus, fogo selvagem, drug-induced, paraneoplastic, and IgA pemphigus.
  • Pemphigus vulgaris is the most common type. It is an autoimmune blistering disease with antibodies directed toward desmoglein 3. Older adults (50-60s) are affected, with a 10-fold increased risk in individuals of Jewish ancestry. Symptoms include painful oral and/or other mucosal sites, potentially life-threatening.
  • Pemphigus vulgaris diagnosis involves biopsy (H&E and DIF), and blood tests (IIF and ELISA). ELISA is highly sensitive and specific for desmoglein 3 antibodies.

Classification of Pemphigus

  • Pemphigus vulgaris
  • Pemphigus vegetans
  • Pemphigus foliaceus
  • Pemphigus erythematosus
  • Fogo selvagem
  • Drug-induced pemphigus
  • Paraneoplastic pemphigus
  • IgA pemphigus

Pemphigus Vulgaris - Clinical

  • Characterized by painful oral and other mucosal erosions, sometimes with flaccid skin blisters.
  • Mucosal erosions are irregular, and painful. Oral, esophageal, conjunctival, vaginal, penile, and anal mucosa can be involved.
  • Skin blisters are easily ruptured and heal slowly, or not at all.
  • Nikolsky and Asboe-Hansen signs are often present.
  • Secondary infections (e.g., HSV, staph, strep) are common.
  • Non-scarring lesions are a hallmark.

Pemphigus Vulgaris - Diagnosis

  • Diagnosis requires biopsy (H&E and DIF).
  • Indirect immunofluorescence (IIF) and enzyme-linked immunosorbent assay (ELISA) on blood are used. IIF uses monkey esophagus, ELISA tests for desmoglein 3 antibodies. Antibody levels can predict disease activity.

Pemphigus Vulgaris - Treatment

  • Prednisone is a cornerstone treatment.
  • Immunosuppressants (e.g., mycophenolate, azathioprine, cyclophosphamide) can also be used.
  • Rituximab is sometimes used, particularly in severe cases.
  • Initial treatment varies from mild to moderate or severe pemphigus. Often includes oral steroids and, potentially, rituximab. Disease control can lead to tapering doses. Relapses may require increasing doses or additional treatment.
  • Prognosis is influenced by steroid use before treatment. Without treatment, life expectancy was limited.

Subpidermal Bullous Diseases

  • Includes bullous pemphigoid, pemphigoid gestationis, cicatricial pemphigoid, linear IgA disease, chronic bullous disease of childhood, dermatitis herpetiformis, bullous lupus, and epidermolysis bullosa acquisita.
  • Bullous pemphigoid is the most common subepidermal autoimmune blistering disorder. It impacts older adults (age > 60).
  • Characteristics include non-bullous or bullous presentation. Pruritus, excoriations, eczematous, papular or urticarial form are symptoms. Tense blisters on normal or erythematous skin. Oral involvement is present in about 10–30% of patients. Associated with peripheral eosinophilia.
  • Diagnosis involves blood tests (ELISA, IIF) and biopsy (H&E and DIF). Topical or oral steroids, immunosuppressants, IVIg, or rituximab are treatment options.

Pemphigoid Gestationis

  • Also known as "Herpes Gestationis."
  • Starts during the second trimester of pregnancy. Often flares at delivery.
  • Recurs during future pregnancies and periods of menstruation.
  • Symptoms include pruritic, urticarial plaques and tense bullae, starting around the umbilicus and spreading.
  • Risk to the baby includes prematurity or small size at birth.
  • Maternal complications include an increased risk of Graves disease. There is a 10% risk to the infant of skin disease, but it usually resolves spontaneously.

Dermatitis Herpetiformis

  • Cutaneous manifestation of celiac disease.
  • Associated with northern European heritage and a mean age of around 40 years.
  • Strong association with HLA-DQ2 (and celiac disease) and thyroid disorders (particularly Hashimoto thyroiditis)
  • Characterized by symmetric grouped or herpetiform papulovesicles on an inflamed base, along with urticarial plaques and papules/vesicles.
  • Areas affected include elbows, knees, extensor forearms, back, and buttocks. Severe pruritus (itching) is common. Lesions often rupture or erode, leaving crusted areas.
  • Diagnosis requires biopsy (H&E and DIF) and blood tests (total serum IgA, IgA anti-endomysial, and anti-tissue transglutaminase antibodies).
  • Treatment focuses on a gluten-free diet, supplemented by dapsone, a medication for quick relief of pruritus. No effect on intestinal disease, but lesions return within 24-48 hours of stopping if the patient continues to eat gluten.

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