Wound Care and Dressings — MCQs
Which anatomical structure is most commonly the target of incisions during major gynecological surgical procedures?
A 60-year-old person who completed treatment for leprosy many years ago now presents with a punched-out, painless ulcer on the sole of his foot. What is the most appropriate management?
A patient with grossly contaminated wound presents 12 hours after an accident. His wound should be managed by -
Following injury to a blood vessel, immediate hemostasis is achieved by:
All of the following statements regarding Dracunculiasis are true except -
The image shows a Negative Pressure Wound Therapy (NPWT) dressing applied to a patient's wound. What is the ideal negative pressure range commonly used for NPWT to promote wound healing?
Unna boot is used for the treatment of which condition?
Which of the following is NOT true regarding patch testing?
A 45-year-old farmer presents with a 3-year history of itchy, erythematous papular lesions on the face, neck, 'V' area of the chest, and the dorsum of the hands and forearms. The lesions are more severe in the summer and improve significantly in the winter. What is the most appropriate diagnostic test for this condition?
Patch test is done to document which type of hypersensitivity?
Wound Care and Dressings Indian Medical PG Practice Questions and MCQs
Question 1: Which anatomical structure is most commonly the target of incisions during major gynecological surgical procedures?
- A. Ovary
- B. Cervix
- C. Fallopian tube
- D. Uterus (Correct Answer)
Explanation: ***Uterus*** - The **uterus** is the primary anatomical target for many major gynecological procedures, such as **hysterectomy** (removal of the uterus) and **myomectomy** (removal of fibroids from the uterus). - These are among the most commonly performed major gynecological surgeries, making the uterus the most frequent target for incisions in gynecological practice. - In obstetric procedures, the uterus is also incised during **cesarean sections**, highlighting its central role in both obstetric and gynecologic surgery. *Ovary* - While ovaries are involved in gynecological surgery (e.g., **oophorectomy**, cystectomy), they are not as frequently the *primary* target for incisions as the uterus in the context of major procedures. - Ovarian surgeries are often performed for **cysts**, **tumors**, or in conjunction with hysterectomy, but are less common than uterine procedures. - Many ovarian procedures can be managed laparoscopically without major incisions. *Cervix* - The **cervix** is incised in procedures like **trachelectomy** for cervical cancer or during specific cervical cerclage procedures, but these are less frequent compared to surgeries involving the uterine body itself. - Many cervical procedures are considered minor (e.g., LEEP, cone biopsy) or are part of a larger uterine surgery. *Fallopian tube* - The **fallopian tubes** are primarily targeted for procedures like **salpingectomy** (removal of the tube, often for ectopic pregnancy or sterilization) or salpingostomy. - While significant, these procedures are generally less common than those involving the uterus and overall less frequently associated with major incisions compared to uterine procedures.
Question 2: A 60-year-old person who completed treatment for leprosy many years ago now presents with a punched-out, painless ulcer on the sole of his foot. What is the most appropriate management?
- A. Restart MDT
- B. Amputation
- C. Intense debridement and intravenous antibiotics (Correct Answer)
- D. Offloading and comprehensive wound care
Explanation: ***Intense debridement and intravenous antibiotics*** - The presence of a **punched-out, painless ulcer** in a patient with a history of leprosy suggests a **neuropathic ulcer** that has likely become infected due to compromised sensation and foot care [3]. - **Intense debridement** is crucial to remove necrotic tissue and reduce bacterial load, while **intravenous antibiotics** are necessary to treat the deep-seated infection often associated with such ulcers, especially given the poor vascularity and compromised healing in leprosy [2]. *Restart MDT* - The patient completed **leprosy treatment many years ago**, indicating that the current ulcer is not an active leprosy lesion requiring multidrug therapy (MDT). - Restarting MDT would be inappropriate as there is no evidence of **active Mycobacterium leprae infection**. *Amputation* - Amputation is a **last resort** for severe, uncontrolled infections or extensive tissue damage that cannot be salvaged. - While neuropathic ulcers can lead to amputation, it is not the initial or most appropriate management unless there are signs of **irreversible ischemia or overwhelming sepsis** that are not mentioned here. *Offloading and comprehensive wound care* - While **offloading** and comprehensive wound care are essential components of long-term management and prevention for neuropathic ulcers, they are insufficient as the primary treatment for an already **infected, deep ulcer** [2]. - **Debridement** and **antibiotics** are critical initial steps to control the infection before offloading and routine wound care can effectively promote healing [1].
Question 3: A patient with grossly contaminated wound presents 12 hours after an accident. His wound should be managed by -
- A. Thorough cleaning with debridement of all dead and devitalised tissue without primary closure (Correct Answer)
- B. Primary closure over a drain
- C. Covering the defect with split skin graft after cleaning
- D. Thorough cleaning and primary repair
Explanation: ***Thorough cleaning with debridement of all dead and devitalised tissue without primary closure*** - For a **grossly contaminated wound** presenting 12 hours after injury, thorough **wound lavage** and **debridement** of all non-viable tissue are crucial to reduce bacterial load. - **Delayed primary closure** or **secondary intention healing** is preferred over primary closure in such cases to prevent infection spread. *Primary closure over a drain* - **Primary closure** of a grossly contaminated wound significantly increases the risk of **wound infection**, even with a drain. - Drains may help with fluid collection but do not sufficiently mitigate the risk of infection in a dirty wound. *Covering the defect with split skin graft after cleaning* - Applying a **skin graft** to a potentially infected wound is contraindicated as it will likely fail due to the **bacterial burden**. - Grafting is typically performed on clean, well-vascularized wound beds. *Thorough cleaning and primary repair* - While **thorough cleaning** is essential, **primary repair** (closure) of a grossly contaminated wound is associated with a high risk of **surgical site infection**. - **Delayed closure** allows for observation and further debridement if necessary.
Question 4: Following injury to a blood vessel, immediate hemostasis is achieved by:
- A. Fibrin deposition
- B. Vasoconstriction (Correct Answer)
- C. Platelet adhesion
- D. Thrombosis
Explanation: ***Vasoconstriction*** - Following blood vessel injury, **vasoconstriction** occurs immediately, reducing blood flow and minimizing blood loss. - It is a **reflex response** mediated by local factors and neural mechanisms aiming to maintain hemostasis. *Fibrin deposition* - **Fibrin deposition** occurs later in the hemostatic process, primarily during the **coagulation phase** after initial vascular responses. - It is not an immediate response; rather, it's part of the **clot stabilization** process, requiring activation of the clotting cascade. *Thrombosis* - Thrombosis refers to the formation of a **blood clot** within a vessel, which happens after initial hemostatic mechanisms are activated. - It is not the **immediate** response post-injury; there is a sequence of events that lead to thrombosis after vasoconstriction and platelet activation. *Platelet adhesion* - Although platelet adhesion is crucial in hemostasis, it occurs following **vasoconstriction** and is not an immediate response to vessel injury [1][2]. - This process is part of the **primary hemostasis** phase, which cannot occur efficiently without prior initial vasoconstriction. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 581-582. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 128.
Question 5: All of the following statements regarding Dracunculiasis are true except -
- A. The disease is limited to tropical and subtropical regions
- B. India has eradicated this disease
- C. No animal reservoir has been identified
- D. Niridazole is effective in treating the disease. (Correct Answer)
Explanation: ***Niridazole is effective in treating the disease.*** - There are currently **no effective antiparasitic drugs** to treat Dracunculiasis. - Treatment focuses on **manual extraction of the worm** and symptom management, not chemotherapy. - Niridazole and other antiparasitic agents have been tried but are **not effective** for curing the infection. *The disease is limited to tropical and subtropical regions* - Dracunculiasis is predominantly found in **arid and semi-arid regions** of Africa, particularly those with poor access to safe drinking water. - Its geographical distribution is indeed restricted to **tropical and subtropical areas**, matching the environmental needs of its lifecycle. *India has eradicated this disease* - India successfully **eradicated Dracunculiasis in 2000**, a significant public health achievement. - This demonstrates that elimination is possible through sustained public health interventions focused on providing safe drinking water and community education. *No animal reservoir has been identified* - Humans have traditionally been considered the **primary definitive host** for *Dracunculus medinensis*. - While dogs and other animals can occasionally be infected, they play a **minimal role in transmission**, and the disease is primarily sustained through the human-cyclops-human cycle. - The statement is essentially **correct** from a classical epidemiological perspective where humans are the main reservoir.
Question 6: The image shows a Negative Pressure Wound Therapy (NPWT) dressing applied to a patient's wound. What is the ideal negative pressure range commonly used for NPWT to promote wound healing?
- A. -125 mm Hg (Correct Answer)
- B. 60-80 mm Hg
- C. 130 mm Hg
- D. 80-100 mm Hg
Explanation: ***-125 mm Hg*** - **Negative Pressure Wound Therapy (NPWT)** uses controlled subatmospheric (negative) pressure to promote wound healing. - The most commonly used pressure setting is **-125 mm Hg**, which has been extensively validated in clinical studies. - This pressure level effectively promotes granulation tissue formation, reduces edema, removes exudate, and increases blood flow to the wound bed. - **-75 to -125 mm Hg** is the typical therapeutic range, with -125 mm Hg being the standard setting for most wound types. *60-80 mm Hg* - This represents **positive pressure**, not negative pressure used in NPWT. - NPWT requires subatmospheric (below atmospheric) pressure, denoted by the negative sign. - Positive pressures in this range would be used in compression therapy for venous insufficiency, not vacuum-assisted wound closure. *130 mm Hg* - This is a **positive pressure** value and does not apply to NPWT. - NPWT uses negative (suction) pressure, not positive compression. - If interpreted as -130 mm Hg, this would be at the higher end and might increase patient discomfort without additional benefit over -125 mm Hg. *80-100 mm Hg* - These are **positive pressure** values not used in NPWT. - NPWT specifically requires negative pressure (vacuum/suction) to work effectively. - This range would be excessively high even for compression therapy and inappropriate for NPWT.
Question 7: Unna boot is used for the treatment of which condition?
- A. Diabetic foot ulcer
- B. Varicose ulcers (Correct Answer)
- C. Ankle instability
- D. Calcaneum fracture
Explanation: **Explanation:** The **Unna boot** is a specialized compression dressing used primarily for the management of **venous stasis ulcers (varicose ulcers)**. It consists of a zinc oxide-impregnated bandage, often containing calamine and glycerin, which is wrapped around the lower leg from the base of the toes to just below the knee. **Why it is the correct answer:** The mechanism of action is based on **compression therapy**. As the bandage dries, it becomes semi-rigid. When the patient walks, the calf muscles contract against this rigid barrier, significantly enhancing the **musculovenous pump** efficiency. This reduces venous hypertension, decreases edema, and promotes the healing of chronic venous ulcers. **Analysis of Incorrect Options:** * **Diabetic foot ulcer:** These are primarily neuropathic or ischemic. Treatment focuses on offloading pressure (e.g., total contact casts) and revascularization, rather than the semi-rigid compression provided by an Unna boot. * **Ankle instability:** This requires mechanical stabilization via braces, taping, or surgical intervention to protect ligaments, not a medicated compression wrap. * **Calcaneum fracture:** Fractures require rigid immobilization (plaster casts) or surgical fixation. An Unna boot does not provide sufficient structural support for bone healing. **High-Yield Clinical Pearls for NEET-PG:** * **Composition:** Zinc oxide (promotes healing), Calamine (soothes skin), and Glycerin. * **Contraindication:** It should **not** be used in patients with severe Peripheral Arterial Disease (ABI < 0.5) as compression can worsen ischemia. * **Application:** It is typically changed once a week. * **Gold Standard:** While Unna boots are classic, multilayer compression wraps are now often considered the gold standard for venous ulcers.
Question 8: Which of the following is NOT true regarding patch testing?
- A. Used to diagnose allergic contact dermatitis
- B. Readings are typically taken after 48 hours
- C. False negative results can occur in patients with angry back syndrome (Correct Answer)
- D. The T.R.U.E. test is a type of patch test
Explanation: **Explanation:** **1. Why Option C is the correct answer (The False Statement):** **Angry Back Syndrome** (also known as **Excited Skin Syndrome**) refers to a state of skin hyper-reactivity where a strong positive reaction at one patch test site triggers non-specific positive reactions at other sites. Therefore, it leads to **false-positive** results, not false-negative results. This occurs because the skin's threshold for irritation is lowered globally due to a localized severe inflammatory response. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** Patch testing is the **gold standard** for diagnosing Type IV (delayed-type) hypersensitivity reactions, specifically **Allergic Contact Dermatitis (ACD)**. * **Option B:** In a standard protocol, patches are applied for **48 hours**, removed, and the first reading is taken. a second reading is typically taken at **72–96 hours** to identify delayed reactions. * **Option D:** The **T.R.U.E. test** (Thin-layer Rapid Use Epicutaneous test) is a widely used, standardized, ready-to-use patch testing system containing common allergens impregnated into polyester patches. **3. High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Type IV Hypersensitivity (Cell-mediated). * **Prick Test vs. Patch Test:** Prick tests are for Type I (IgE-mediated) reactions (e.g., asthma, urticaria), while Patch tests are for Type IV. * **Grading (ICDRG):** * **+:** Weak (non-vesicular) reaction (erythema, infiltration). * **++:** Strong (vesicular) reaction. * **+++:** Extreme (bullous) reaction. * **IR:** Irritant reaction (usually sharply demarcated, "burned" appearance). * **Contraindication:** Testing should not be done during an acute flare-up of dermatitis or if the patient is on high-dose systemic corticosteroids (usually >15-20mg prednisolone).
Question 9: A 45-year-old farmer presents with a 3-year history of itchy, erythematous papular lesions on the face, neck, 'V' area of the chest, and the dorsum of the hands and forearms. The lesions are more severe in the summer and improve significantly in the winter. What is the most appropriate diagnostic test for this condition?
- A. Patch test (Correct Answer)
- B. Skin biopsy
- C. Intradermal prick test
- D. Estimation of IgE levels in blood
Explanation: ### Explanation **Diagnosis: Parthenium Dermatitis (Airborne Contact Dermatitis)** The clinical presentation of itchy, erythematous papules in a "photo-distributed" pattern (face, neck, 'V' area of chest, and dorsum of hands/forearms) in a farmer, with seasonal exacerbation in summer, is classic for **Parthenium Dermatitis**. This is a type of **Airborne Contact Dermatitis (ABCD)** caused by the weed *Parthenium hysterophorus*. **1. Why Patch Test is the Correct Answer:** Parthenium dermatitis is a **Type IV (Delayed-type) Hypersensitivity reaction**. The gold standard for diagnosing Type IV hypersensitivity is the **Patch Test**. It identifies the specific allergen (usually the sesquiterpene lactone in Parthenium) responsible for the T-cell mediated allergic response. **2. Why Other Options are Incorrect:** * **Skin Biopsy:** While it may show features of eczematous dermatitis (spongiosis), it is non-specific and cannot identify the causative allergen. * **Intradermal Prick Test:** This is used to diagnose **Type I (Immediate) Hypersensitivity** (e.g., asthma, allergic rhinitis). It is not used for contact dermatitis. * **Estimation of IgE levels:** IgE is a marker for Type I hypersensitivity and atopic conditions. It has no diagnostic value in Type IV hypersensitivity reactions like ABCD. **Clinical Pearls for NEET-PG:** * **Distribution:** Unlike true photodermatitis, ABCD often involves the **upper eyelids, nasolabial folds, and retroauricular areas** (the "shadow regions"), as pollen/dust can settle there. * **Common Allergen:** In India, *Parthenium hysterophorus* (Congress grass) is the most common cause. * **Management:** Avoidance of the allergen is key. Topical steroids and sun protection are used for symptomatic relief. In chronic cases, azathioprine may be used as a steroid-sparing agent.
Question 10: Patch test is done to document which type of hypersensitivity?
- A. Type I hypersensitivity
- B. Delayed type hypersensitivity (Correct Answer)
- C. Autoimmune disease
- D. Immunocomplex deposition
Explanation: ### Explanation **Correct Answer: B. Delayed type hypersensitivity** The **Patch Test** is the gold standard diagnostic tool for **Allergic Contact Dermatitis (ACD)**. ACD is a classic example of **Type IV Hypersensitivity** (also known as Delayed-type Hypersensitivity). * **Mechanism:** This reaction is **T-cell mediated** (specifically Th1 cells) rather than antibody-mediated. When an allergen contacts the skin of a sensitized individual, memory T-cells recognize the antigen, leading to the release of cytokines and subsequent inflammation. * **Timing:** Because it takes time for T-cell recruitment and cytokine production, the reaction typically peaks at **48 to 72 hours**, which is why patch test readings are performed at these intervals. --- ### Why other options are incorrect: * **A. Type I Hypersensitivity:** This is an immediate, IgE-mediated reaction (e.g., Anaphylaxis, Urticaria). It is tested using the **Skin Prick Test**, not the Patch Test. * **C. Autoimmune Disease:** While some autoimmune skin diseases (like Pemphigus) are diagnosed via Immunofluorescence (DIF/IIF), the patch test specifically identifies external allergens, not auto-antibodies against self-antigens. * **D. Immunocomplex Deposition:** This refers to **Type III Hypersensitivity** (e.g., SLE, Vasculitis). These are typically diagnosed via skin biopsy and direct immunofluorescence showing granular deposits (e.g., Lumpy-bumpy pattern). --- ### High-Yield Facts for NEET-PG: * **Standard Series:** The most commonly used series globally is the **European Standard Series**; in India, it is the **ISDR (Indian Standard Series)**. * **Commonest Allergen:** Globally, **Nickel** (found in artificial jewelry) is the most common allergen. In India, **Parthenium** (Congress grass) is a frequent cause of airborne contact dermatitis. * **Reading Schedule:** Readings are usually taken at **48 hours** (removal of patches) and **72 or 96 hours** (delayed reading). * **Open Patch Test:** Used for substances with potential irritancy or volatile compounds.
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