Androgenetic Alopecia Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Androgenetic Alopecia. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Androgenetic Alopecia Indian Medical PG Question 1: What is the primary mechanism of action of 5-α reductase?
- A. Reduction of C4-C5 double bond (Correct Answer)
- B. Breakage of amide bond
- C. Breakage of C-N bond
- D. Breakage of N-N bond
Androgenetic Alopecia Explanation: ***Reduction of C4-C5 double bond***
- 5-α reductase is a **NADPH-dependent reductase enzyme** that catalyzes the **reduction (saturation) of the C4-C5 double bond** in the A-ring of testosterone to form **dihydrotestosterone (DHT)**.
- This reduction involves **adding two hydrogen atoms** across the double bond, converting it to a single bond with **5-α stereochemistry**.
- DHT is a more potent androgen crucial for **prostate development, external genitalia formation, and male pattern baldness**, making 5-α reductase inhibitors (like finasteride) clinically important for treating benign prostatic hyperplasia and androgenetic alopecia.
*Breakage of amide bond*
- Breaking **amide bonds (C-N bonds with a carbonyl)** is the function of **proteases and amidases**, not reductases.
- This process involves **hydrolysis** and is fundamental to protein degradation and peptide metabolism.
*Breakage of C-N bond*
- **Carbon-nitrogen bond cleavage** occurs in reactions like **deamination** (catalyzed by deaminases) or metabolism of nitrogenous compounds.
- Reductases perform **electron transfer reactions**, not bond cleavage reactions.
*Breakage of N-N bond*
- **Nitrogen-nitrogen bond** cleavage is rare in human biochemistry and may occur in hydrazine metabolism or by specialized enzymes.
- Steroid hormones do not contain N-N bonds, making this mechanism irrelevant to 5-α reductase function.
Androgenetic Alopecia Indian Medical PG Question 2: Which of the following are treatment options for acne vulgaris?
- A. Isotretinoin
- B. All of the options (Correct Answer)
- C. Topical erythromycin
- D. Oral Minocycline
Androgenetic Alopecia Explanation: ***All of the options***
- All listed options (Isotretinoin, Topical erythromycin, and Oral Minocycline) are well-established and commonly used **treatment options for acne vulgaris**, depending on the severity and type of acne.
- The choice of treatment often follows a stepped approach, starting with topical agents for mild to moderate acne and progressing to oral medications like antibiotics or isotretinoin for more severe or resistant cases.
*Isotretinoin*
- **Isotretinoin** is a powerful oral retinoid primarily used for **severe, recalcitrant nodular acne** that has not responded to other treatments.
- It works by reducing sebum production, follicular hyperkeratinization, inflammation, and the growth of *P. acnes*.
*Topical erythromycin*
- **Topical erythromycin** is an **antibiotic** used to treat mild to moderate inflammatory acne by reducing the growth of *Cutibacterium acnes* (formerly *Propionibacterium acnes*) and decreasing inflammation.
- It is often combined with other topical agents like benzoyl peroxide to minimize the development of **antibiotic resistance**.
*Oral Minocycline*
- **Oral minocycline** is a **tetracycline antibiotic** used for moderate to severe inflammatory acne.
- It reduces bacterial populations on the skin and exhibits **anti-inflammatory properties**, making it effective for widespread or deeper lesions.
Androgenetic Alopecia Indian Medical PG Question 3: Which antihypertensive agent is used topically to treat alopecia and should be used with caution in young females?
- A. Hydralazine
- B. Prazosin
- C. Minoxidil (Correct Answer)
- D. Indapamide
Androgenetic Alopecia Explanation: ***Minoxidil***
- **Minoxidil** is a direct **vasodilator** that, when applied topically, stimulates hair growth and is commonly used for **androgenetic alopecia**.
- It should be used with caution in young females due to the potential for **hypertrichosis** (unwanted hair growth) outside the scalp if not applied precisely.
*Hydralazine*
- **Hydralazine** is a direct-acting **vasodilator** primarily used orally or intravenously to treat moderate to severe hypertension and heart failure.
- It is not used topically for alopecia and acts differently on blood vessels than minoxidil.
*Prazosin*
- **Prazosin** is an **alpha-1 adrenergic blocker** used orally to treat hypertension, benign prostatic hyperplasia, and sometimes PTSD.
- It is not indicated for topical use in alopecia.
*Indapamide*
- **Indapamide** is a **thiazide-like diuretic** that acts by increasing the excretion of sodium and water, primarily used to treat hypertension and edema.
- It has no known role in the topical treatment of alopecia.
Androgenetic Alopecia Indian Medical PG Question 4: A male presents with alopecia and exclamation mark hairs. Diagnosis?
- A. Telogen effluvium
- B. Androgenic alopecia
- C. Alopecia areata (Correct Answer)
- D. Tinea capitis
Androgenetic Alopecia Explanation: ***Alopecia areata***
- The presence of **exclamation mark hairs** (hairs that are narrower closer to the scalp and wider at the distal end) is a classic dermatoscopic finding specifically associated with **alopecia areata**.
- **Alopecia areata** is an autoimmune condition characterized by patchy hair loss and often presents with these peculiar hair shaft abnormalities.
*Telogen effluvium*
- This condition involves diffuse thinning of hair, often triggered by stress, illness, or hormonal changes, but does not typically present with **exclamation mark hairs**.
- It is characterized by an increased shedding of **telogen (resting phase)** hairs, with no specific hair shaft abnormalities like exclamation marks.
*Androgenic alopecia*
- This is the most common type of hair loss, characterized by a patterned balding (receding hairline, thinning crown), due to the effect of androgens on genetically susceptible hair follicles.
- While it causes hair miniaturization, it does not involve the formation of **exclamation mark hairs**.
*Tinea capitis*
- This is a **fungal infection** of the scalp that typically causes scaly patches, broken hairs, and sometimes inflammation or painful lesions, often with associated **lymphadenopathy**.
- The distinctive **exclamation mark hairs** are not a feature of **tinea capitis**; instead, broken-off hairs or "black dots" may be observed.
Androgenetic Alopecia Indian Medical PG Question 5: Rapid, diffuse, excessive hair loss occurring 3 months after childbirth is due to?
- A. Telogen effluvium (Correct Answer)
- B. Anagen effluvium
- C. Alopecia areata
- D. Androgenetic alopecia
Androgenetic Alopecia Explanation: ***Telogen effluvium***
- This condition is characterized by an excessive shedding of **club hairs** from the hair follicle, typically occurring 2-4 months after a significant stressor such as **pregnancy and childbirth**.
- During pregnancy, high estrogen levels increase the number of follicles in the anagen (growth) phase; after delivery, estrogen drops, and many follicles simultaneously enter the **telogen (resting) phase**, leading to synchronized shedding.
*Anagen effluvium*
- This type of hair loss is rapid and severe, occurring when a significant percentage of **hair follicles** in the **anagen phase** are abruptly stopped from growing.
- It is often seen with **chemotherapy, radiation therapy**, or exposure to toxins, which damage actively dividing hair matrix cells.
*Alopecia areata*
- This is an **autoimmune condition** where the body's immune system attacks hair follicles, leading to distinct, typically **round patches of hair loss**.
- It can affect any hair-bearing area and is not directly linked to hormonal changes post-pregnancy.
*Androgenetic alopecia*
- Commonly known as **male or female pattern baldness**, this is a genetic condition influenced by androgens, characterized by a progressive **miniaturization of hair follicles**.
- It presents as a characteristic pattern of thinning, such as a receding hairline or thinning at the crown, and is not typically a rapid, diffuse postpartum event.
Androgenetic Alopecia Indian Medical PG Question 6: Swarm of bees appearance seen in?
- A. Telogen effluvium
- B. Alopecia areata (Correct Answer)
- C. Androgenetic alopecia
- D. Anagen effluvium
Androgenetic Alopecia Explanation: ***Alopecia areata***
- The "swarm of bees" appearance refers to the characteristic **peribulbar lymphocytic inflammation** seen on scalp biopsy in active alopecia areata.
- This finding represents an **immune response targeting the hair follicles**, leading to non-scarring hair loss.
*Telogen effluvium*
- Histologically, telogen effluvium is characterized by a high proportion of **telogen hairs** in the hair counts and **no significant inflammation** around the follicles.
- The "swarm of bees" peribulbar infiltrate is not a feature of telogen effluvium, which is typically a reaction to a systemic stressor.
*Androgenetic alopecia*
- Androgenetic alopecia is characterized by **follicular miniaturization**, where vellus hairs replace terminal hairs, and a **decrease in the number of hair follicles**.
- It does not show the "swarm of bees" peribulbar lymphocytic infiltrate; instead, there might be subtle inflammation or fibrosis in advanced stages but not the dense peribulbar type.
*Anagen effluvium*
- Anagen effluvium is characterized by the **sudden shedding of hairs in the anagen phase** due to a toxic or inflammatory insult disrupting hair matrix keratinocyte proliferation.
- Histology often shows **dystrophic anagen hairs** and damaged hair shafts, but not the specific "swarm of bees" lymphocytic infiltrate seen in alopecia areata.
Androgenetic Alopecia Indian Medical PG Question 7: A male presents with alopecia and exclamation mark hairs. Diagnosis?
- A. Alopecia areata (Correct Answer)
- B. Tinea capitis
- C. Telogen effluvium
- D. Androgenic alopecia
Androgenetic Alopecia Explanation: ***Alopecia areata***
- **Alopecia areata** is characterized by sudden, non-scarring hair loss that can affect any hair-bearing area, including the scalp.
- The presence of **exclamation mark hairs** (hairs that are narrower closer to the scalp) is a classic dermatoscopic finding in alopecia areata and is highly suggestive of the diagnosis.
*Tinea capitis*
- **Tinea capitis** is a fungal infection of the scalp often presenting with scaling, erythema, and broken hairs, but typically not "exclamation mark hairs."
- It may cause **patchy alopecia** but is usually associated with inflammation and sometimes pustules.
*Telogen effluvium*
- **Telogen effluvium** is a diffuse, non-scarring hair shedding that occurs after a stressful event, leading to widespread thinning rather than localized patches.
- It primarily involves an increase in the number of hairs in the **telogen (resting) phase** and does not typically feature exclamation mark hairs.
*Androgenic alopecia*
- **Androgenic alopecia**, or male/female pattern baldness, is characterized by a gradual, patterned hair loss due to genetic and hormonal factors.
- It involves the miniaturization of hair follicles and progressive thinning, but it does not present with **exclamation mark hairs** or discrete patches of complete hair loss.
Androgenetic Alopecia Indian Medical PG Question 8: Non-scarring alopecia is associated with all except?
- A. Telogen effluvium
- B. Androgenetic alopecia
- C. Alopecia areata
- D. Frontal fibrosing alopecia (Correct Answer)
Androgenetic Alopecia Explanation: ***Frontal fibrosing alopecia***
- This condition is a form of **lichen planopilaris**, which causes **scarring alopecia** due to destruction of hair follicles and replacement with fibrous tissue.
- It results in a **receding hairline** and eyebrow loss, with irreversible hair loss.
*Telogen effluvium*
- This is a common cause of **non-scarring alopecia**, characterized by diffuse hair shedding triggered by various stressors like illness, stress, or medications.
- The hair follicles enter the **telogen phase** prematurely, leading to increased shedding but typically regrowth once the trigger is removed.
*Androgenetic alopecia*
- Often referred to as **male or female pattern baldness**, this is a form of **non-scarring alopecia** driven by genetic predisposition and androgens.
- It causes a progressive miniaturization of hair follicles, leading to thinning hair, but the follicles remain present and capable of producing hair.
*Alopecia areata*
- This is an **autoimmune condition** that causes **non-scarring hair loss** in patches on the scalp or other parts of the body.
- The hair follicles are attacked by the immune system but are not permanently destroyed, allowing for potential regrowth.
Androgenetic Alopecia Indian Medical PG Question 9: Consider the following causes of alopecia: 1. Androgenetic alopecia 2. Alopecia areata 3. Telogen effluvium 4. Lichen planopilaris. Which among the following causes non-scarring alopecia?
- A. 1, 2 and 3 (Correct Answer)
- B. Only 4
- C. 3 and 4
- D. 2, 3 and 4
Androgenetic Alopecia Explanation: **1, 2, and 3**
- **Androgenetic alopecia**, **alopecia areata**, and **telogen effluvium** are all forms of **non-scarring alopecia**, meaning the hair follicles are primarily affected without permanent destruction.
- In these conditions, there is potential for hair regrowth as the follicular structures remain intact.
*Only 4*
- **Lichen planopilaris** is a type of **scarring alopecia**, characterized by permanent destruction of hair follicles and replacement with fibrous tissue.
- This leads to irreversible hair loss in the affected areas.
*3 and 4*
- While **telogen effluvium** causes non-scarring alopecia, **lichen planopilaris** is a scarring alopecia.
- Therefore, this option incorrectly groups a non-scarring and a scarring condition.
*2, 3, and 4*
- This option correctly identifies **alopecia areata** and **telogen effluvium** as non-scarring but incorrectly includes **lichen planopilaris**, which results in scarring alopecia.
- **Lichen planopilaris** has inflammatory infiltrates that lead to permanent follicular damage.
Androgenetic Alopecia Indian Medical PG Question 10: Pitting of nails is seen in:
- A. Psoriasis and Alopecia areata (Correct Answer)
- B. Psoriasis only
- C. Psoriasis and Lichen planus
- D. Alopecia areata and Eczema
Androgenetic Alopecia Explanation: ***Psoriasis and Alopecia areata***
- **Nail pitting** is a very common and characteristic finding in **psoriasis**, resulting from defective keratinization of the nail matrix.
- While less common, nail pitting can also occur in **alopecia areata**, typically due to inflammation affecting the nail matrix.
*Psoriasis only*
- While **psoriasis** is a primary cause of nail pitting, stating it as "only" is incorrect as other conditions also present with this sign.
- This option incorrectly limits the differential diagnosis for nail pitting.
*Psoriasis and Lichen planus*
- **Psoriasis** does cause nail pitting, but **lichen planus** typically causes **longitudinal ridging**, splitting, subungual hyperkeratosis, and sometimes pterygium formation, rather than classic pitting.
- This option includes a condition that usually manifests with different nail changes.
*Alopecia areata and Eczema*
- **Alopecia areata** can cause nail pitting, but **eczema** of the hands or fingers more commonly leads to **nail plate dystrophy**, discoloration, ridging, or thickening, rather than distinct pitting.
- While eczema can affect nails, pitting is not its characteristic nail manifestation.
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