Prophylaxis and Management Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Prophylaxis and Management. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Prophylaxis and Management Indian Medical PG Question 1: 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
Prophylaxis and Management 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.
Prophylaxis and Management Indian Medical PG Question 2: What is the best way to control the MRSA infection in the ward?
- A. Fumigation of ward frequently
- B. Washing hand before and after attending patients (Correct Answer)
- C. Wearing masks during invasive procedures in ICU
- D. Vancomycin given empirically to all the patients
Prophylaxis and Management Explanation: **Washing hand before and after attending patients**
- **Hand hygiene** is the single most effective measure in preventing the transmission of **healthcare-associated infections**, including **MRSA**.
- **Healthcare workers' hands** are the primary vehicle for spreading pathogens from one patient to another.
*Fumigation of ward frequently*
- **Fumigation** is generally not recommended for routine infection control and has limited efficacy against resistant organisms like **MRSA** in this context.
- It does not address the primary mode of transmission, which is direct contact via **contaminated hands** or surfaces.
*Wearing masks during invasive procedures in ICU is important.*
- While important for preventing infections during **invasive procedures** and protecting against **aerosolized pathogens**, masks are not the primary strategy for controlling the spread of **MRSA** in routine ward settings.
- **MRSA transmission** is predominantly contact-based, not airborne.
*Vancomycin given empirically to all the patients*
- **Empirical broad-spectrum antibiotic use** for all patients is a significant driver of **antibiotic resistance**, including **MRSA**.
- It should be reserved for patients with suspected or confirmed **MRSA infections** based on clinical criteria and culture results, not as a general preventive measure.
Prophylaxis and Management Indian Medical PG Question 3: A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?
- A. Postoperative administration for 5 to 7 days of parenteral antibiotics effective against aerobes and anaerobes
- B. A single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes may provide initial coverage. (Correct Answer)
- C. Postoperative administration for 2 to 4 days of parenteral antibiotics effective against aerobes and anaerobes
- D. Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile
Prophylaxis and Management Explanation: ***Single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes***
- For **elective colorectal surgery**, a single dose of a **broad-spectrum parenteral antibiotic** administered within 60 minutes prior to incision is the standard of care to reduce surgical site infections.
- This approach ensures adequate drug levels in the tissues during the period of potential bacterial contamination and is a cornerstone of modern surgical prophylaxis.
- Current guidelines (WHO, SCIP) recommend a single preoperative dose, which may be redosed intraoperatively if the procedure is prolonged beyond 3-4 hours.
*Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile*
- This is **incorrect**. **Oral antibiotics** (such as neomycin and metronidazole) are routinely used preoperatively in conjunction with mechanical bowel preparation for colorectal surgery to reduce intraluminal bacterial load.
- The concern for *Clostridioides difficile* infection is generally low with short-term, targeted prophylactic antibiotic regimens compared to broad-spectrum, prolonged use.
- The combination of oral and parenteral antibiotics has been shown to further reduce surgical site infections.
*Postoperative administration for 5 to 7 days of parenteral antibiotics*
- **Prolonged postoperative antibiotic administration** beyond 24 hours in uncomplicated cases is not recommended as it increases the risk of **antibiotic resistance**, *C. difficile* infection, and adverse drug reactions without additional benefit.
- The goal of prophylactic antibiotics is to cover the period of contamination during surgery, not to treat presumed ongoing infection postoperatively.
*Postoperative administration for 2 to 4 days of parenteral antibiotics*
- While administration for up to 24 hours post-operatively may be considered in some high-risk cases, routine **prolonged postoperative antibiotics** (2-4 days) are unnecessary for most elective colorectal resections.
- Evidence suggests that continuing antibiotics beyond the immediate perioperative period does not further reduce the incidence of **surgical site infections** in clean-contaminated surgeries.
Prophylaxis and Management Indian Medical PG Question 4: A boil is due to staphylococcal infection of:
- A. Hair follicle (Correct Answer)
- B. Sweat gland
- C. Subcutaneous tissue
- D. Epidermis
Prophylaxis and Management Explanation: ***Hair follicle***
- A **boil**, also known as a **furuncle**, is a **deep bacterial infection** of a **hair follicle** and the surrounding tissue.
- It is most commonly caused by **Staphylococcus aureus**.
*Sweat gland*
- While sebaceous glands and apocrine sweat glands can be involved in other skin abscesses (e.g., **hidradenitis suppurativa**), a classic boil originates from a hair follicle.
- Infections of sweat glands alone are not typically classified as boils.
*Subcutaneous tissue*
- An infection primarily in the **subcutaneous tissue** is more characteristic of **cellulitis** or a **cutaneous abscess**, which is a broader term for a collection of pus.
- A boil starts specifically at a hair follicle and then extends into deeper tissues.
*Epidermis*
- The **epidermis** is the outermost layer of the skin, and infections limited to this layer are usually superficial, such as **impetigo**.
- A boil is a much deeper infection, involving structures beneath the epidermis.
Prophylaxis and Management Indian Medical PG Question 5: Which of the following disorders would be more likely associated with Staphylococcus saprophyticus rather than Staphylococcus aureus?
- A. Burns
- B. Tension pneumothorax
- C. Osteomyelitis
- D. Acute cystitis (Correct Answer)
Prophylaxis and Management Explanation: ***Acute cystitis***
- **Staphylococcus saprophyticus** is a common cause of **urinary tract infections (UTIs)**, particularly acute cystitis, in young sexually active women.
- This bacterium has a high affinity for **uroepithelial cells**, facilitating its colonization and subsequent infection of the bladder.
*Tension pneumothorax*
- A **tension pneumothorax** is a medical emergency characterized by air accumulation in the pleural space, leading to lung collapse and mediastinal shift.
- It is typically caused by trauma or iatrogenic factors, not directly by bacterial infection from either *Staphylococcus saprophyticus* or *Staphylococcus aureus*.
*Burns*
- Burn wounds are highly susceptible to bacterial colonization and infection, with **Staphylococcus aureus** being a primary pathogen in this context.
- *Staphylococcus saprophyticus* is rarely associated with burn wound infections.
*Osteomyelitis*
- **Osteomyelitis**, an infection of the bone, is most frequently caused by **Staphylococcus aureus** via hematogenous spread or direct inoculation.
- *Staphylococcus saprophyticus* is not a common pathogen in osteomyelitis.
Prophylaxis and Management Indian Medical PG Question 6: A diabetic patient developed cellulitis due to S. aureus, which was found to be methicillin resistant on the antibiotic sensitivity testing. All of the following antibiotics will be appropriate except ?
- A. Vancomycin
- B. Teicoplanin
- C. Linezolid
- D. Imipenem (Correct Answer)
Prophylaxis and Management Explanation: ***Imipenem***
- **Imipenem** is a carbapenem antibiotic that is effective against many Gram-positive and Gram-negative bacteria, but it is **not active against MRSA (methicillin-resistant *Staphylococcus aureus*)**.
- MRSA strains are resistant to all beta-lactam antibiotics, including penicillins, cephalosporins, and carbapenems like imipenem, due to the presence of the **mecA gene** which encodes for an altered penicillin-binding protein (PBP2a).
*Vancomycin*
- **Vancomycin** is a glycopeptide antibiotic that is a primary choice for treating **MRSA infections**, including cellulitis.
- It inhibits cell wall synthesis by binding to the D-Ala-D-Ala precursor, preventing cross-linking, and is specifically active against **Gram-positive bacteria**.
*Teicoplanin*
- **Teicoplanin** is another glycopeptide antibiotic, similar to vancomycin, and is also considered a suitable agent for treating **MRSA infections**.
- It works by inhibiting bacterial cell wall synthesis and has a **longer half-life** than vancomycin, allowing for less frequent dosing.
*Linezolid*
- **Linezolid** is an oxazolidinone antibiotic known for its activity against **Gram-positive bacteria**, including **MRSA** and vancomycin-resistant enterococci (VRE).
- It inhibits protein synthesis by binding to the 50S ribosomal subunit, preventing the formation of the initiation complex.
Prophylaxis and Management Indian Medical PG Question 7: Hyperkalemia management includes all except:
- A. Insulin drip
- B. MgSO4 (Correct Answer)
- C. Salbutamol nebulisation
- D. Calcium gluconate
Prophylaxis and Management Explanation: ***MgSO4***
- **Magnesium sulfate (MgSO4)** is primarily used to treat **hypomagnesemia** and certain arrhythmias like **Torsades de Pointes**, and for seizures in preeclampsia.
- It does **not have a direct role** in the acute management of hyperkalemia.
*Insulin drip*
- **Insulin** (often given with glucose) actively drives potassium **into cells**, thereby lowering serum potassium levels [1].
- This is a common and effective temporary measure for **hyperkalemia**, especially in urgent situations.
*Salbutamol nebulisation*
- **Salbutamol**, a **beta-2 agonist**, stimulates the cellular **Na-K ATPase pump**, leading to a shift of potassium from the extracellular to the intracellular space [1].
- It provides a **rapid, albeit temporary**, reduction in serum potassium levels.
*Calcium gluconate*
- **Calcium gluconate** does not lower serum potassium levels but rather **stabilizes the cardiac membrane**, protecting the heart from the adverse effects of hyperkalemia [1].
- It is crucial for preventing **life-threatening arrhythmias** in severe hyperkalemia [1].
Prophylaxis and Management Indian Medical PG Question 8: A 35-year-old obese woman presents with recurrent lesions in both axilla in summer season. Wood lamp examination is shown. The diagnosis is:
- A. Ecthyma
- B. Erythrasma (Correct Answer)
- C. Impetigo contagiosa
- D. Bullous impetigo
Prophylaxis and Management Explanation: ***Erythrasma***
- Erythrasma is a superficial bacterial infection caused by **Corynebacterium minutissimum**, which commonly presents as red-brown patches in intertriginous areas like the axilla, especially in obese individuals and warm, humid conditions (summer season).
- The distinctive **coral-red fluorescence under Wood's lamp** is due to porphyrin production by the bacteria, which is a classic diagnostic feature of erythrasma, as shown in the image.
*Ecthyma*
- Ecthyma is a deeper form of impetigo characterized by **ulcerative lesions with a thick, adherent crust** that extend into the dermis.
- It is typically caused by *Streptococcus pyogenes* and sometimes *Staphylococcus aureus*, and would not exhibit coral-red fluorescence under Wood's lamp.
*Impetigo contagiosa*
- Impetigo contagiosa (non-bullous impetigo) presents with **honey-colored crusted lesions**, usually on the face and extremities.
- While also a bacterial skin infection, it is typically caused by *Staphylococcus aureus* or *Streptococcus pyogenes* and does not show coral-red fluorescence under Wood's lamp.
*Bullous impetigo*
- Bullous impetigo is characterized by **flaccid bullae** (blisters) that rupture to form thin, varnish-like crusts, primarily caused by *Staphylococcus aureus* producing exfoliative toxins.
- Similar to other forms of impetigo, it does not produce the coral-red fluorescence under Wood's lamp.
Prophylaxis and Management Indian Medical PG Question 9: What is the treatment for granuloma inguinale?
- A. Tetracycline
- B. Azithromycin (Correct Answer)
- C. Clarithromycin
- D. Streptomycin
Prophylaxis and Management Explanation: ***Azithromycin***
- **Azithromycin** is the recommended first-line treatment for **granuloma inguinale** (donovanosis) caused by *Klebsiella granulomatis*.
- Current recommended regimens: **Azithromycin 1g orally once weekly** OR **500mg daily for at least 3 weeks** (until all lesions have completely healed).
- Preferred due to excellent tissue penetration, good efficacy, and convenient dosing that improves patient compliance.
*Tetracycline*
- **Tetracycline** (500mg four times daily) was historically used but has been largely replaced by **doxycycline** (100mg twice daily) as the preferred tetracycline-class antibiotic.
- While effective against *Klebsiella granulomatis*, it requires frequent dosing leading to poor adherence.
- **Doxycycline** (not listed here) is actually considered a co-first-line option alongside azithromycin in current CDC guidelines.
*Clarithromycin*
- **Clarithromycin** is a macrolide antibiotic but is not a recommended first-line agent for granuloma inguinale.
- Limited clinical data supports its use for this condition, and it is not included in standard treatment guidelines.
- Azithromycin from the same macrolide class is preferred due to better-established efficacy.
*Streptomycin*
- **Streptomycin** is an aminoglycoside antibiotic primarily used for mycobacterial infections (e.g., tuberculosis, plague).
- Not indicated for granuloma inguinale as *Klebsiella granulomatis* responds well to macrolides (azithromycin) and tetracyclines (doxycycline).
- Requires parenteral administration and has significant toxicity concerns (ototoxicity, nephrotoxicity).
Prophylaxis and Management Indian Medical PG Question 10: A child presents with grouped vesicles on an erythematous base on the buttocks. What is the most likely diagnosis?
- A. Bullous impetigo
- B. Dermatitis herpetiformis
- C. Pemphigus
- D. Herpes simplex (Correct Answer)
Prophylaxis and Management Explanation: ***Herpes simplex***
- Herpes simplex virus (HSV) classically presents with **grouped vesicles on an erythematous base**, which perfectly matches this clinical presentation.
- In **children**, HSV commonly affects the **buttocks** through autoinoculation or direct contact, especially in the diaper area.
- The lesions are typically **painful and pruritic**, and may be preceded by tingling or burning sensation.
- Diagnosis is confirmed by **Tzanck smear** (multinucleated giant cells), **PCR**, or **viral culture**.
- Treatment includes **acyclovir** or other antivirals, especially for severe or recurrent cases.
*Dermatitis herpetiformis*
- While DH does present with intensely pruritic, grouped vesicles on an erythematous base, it is **extremely rare in children** and typically presents in **adults (3rd-4th decade)**.
- Classic sites include **extensor surfaces** (elbows, knees), scalp, and buttocks, but the pediatric presentation makes this diagnosis unlikely.
- It is strongly associated with **celiac disease** and responds to **gluten-free diet** and **dapsone**.
*Bullous impetigo*
- Bullous impetigo presents with **flaccid bullae** that rupture to form **honey-colored crusts**, not grouped vesicles.
- It is a **bacterial infection** caused by *Staphylococcus aureus* producing exfoliative toxin.
- Common in **young children**, particularly in warm, humid conditions.
*Pemphigus*
- Pemphigus is **extremely rare in children** and causes **fragile bullae** that easily rupture, leading to erosions.
- Typically affects **mucous membranes first** (oral cavity), then skin.
- It is an **autoimmune blistering disease** with antibodies against desmoglein, causing intraepidermal acantholysis.
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