Preoperative and Postoperative Care — MCQs
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On the 7th post-operative day, an abdominal wound shows pink serosanguinous discharge. What does this suggest?
A 72-year-old woman with atrial fibrillation is on warfarin and is scheduled for ventral hernia repair. She was advised to stop warfarin several days before surgery and was hospitalized for heparinization. During her hospital stay, she developed severe abdominal and flank pain. Her prothrombin time (PT) is normal, but her activated partial thromboplastin time (aPTT) is elevated. An abdominal CT scan revealed a large retroperitoneal hematoma. Which of the following should be administered to reverse the effects of heparin?
Massive blood transfusion is defined as?
All electrolyte abnormalities are seen in the immediate postoperative period, except:
Which of the following statements is true regarding the biochemical changes that occur in burns?
Four days after undergoing subtotal gastrectomy for stomach cancer, a 58-year-old woman complains of right leg and thigh pain, swelling, redness, and tenderness on examination. Deep vein thrombosis is suspected. What is the initial test to establish the diagnosis?
A significant increase in energy expenditure, approximately 100% over normal or two times greater than normal, is typically observed in patients with which of the following conditions?
What is the most important consideration in a patient with borderline pulmonary function undergoing lung resection?
A 65-year-old man undergoes a low anterior resection for rectal cancer. On the fifth day in hospital, his physical examination shows a temperature of 39°C (102°F), blood pressure of 150/90 mm Hg, pulse of 110 beats per minute and regular, and respiratory rate of 28 breaths per minute. A computed tomography (CT) scan of the abdomen reveals an abscess in the pelvis. Which of the following most accurately describes his present condition?
A patient with meningioma and an inflammatory edematous lesion is scheduled for surgery. Which of the following represents a mistake in the junior resident's pre-operative notes?
Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs
Question 71: On the 7th post-operative day, an abdominal wound shows pink serosanguinous discharge. What does this suggest?
- A. Impending wound dehiscence (Correct Answer)
- B. Infection in the abdomen
- C. Stitch abscess
- D. Healing wound
Explanation: ### Explanation **Correct Option: A. Impending wound dehiscence** The appearance of **pink, serosanguinous discharge** (often described as "salmon-colored" fluid) from an abdominal wound between the 5th and 10th postoperative days is the **pathognomonic sign** of impending wound dehiscence (burst abdomen). This fluid is actually peritoneal fluid leaking through a defect in the deep fascial layer that has already separated. While the skin may still appear intact, the discharge indicates that the underlying rectus sheath has given way, and evisceration may be imminent. **Analysis of Incorrect Options:** * **B. Infection in the abdomen:** Intra-abdominal infection or a wound infection typically presents with purulent discharge (pus), localized erythema, warmth, and systemic signs like fever and leucocytosis, rather than thin serosanguinous fluid. * **C. Stitch abscess:** This is a localized infection around a suture track. It presents as a small, painful pustule or boil at the suture site, not a profuse discharge of peritoneal fluid. * **D. Healing wound:** A normally healing wound should be dry or have minimal serous crusting by the 7th day. Active discharge of pink fluid is always pathological at this stage. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Wound dehiscence most commonly occurs between **6 to 10 days** post-surgery. * **The "Gush" Sign:** Patients often report a sudden "gush" of fluid after coughing or straining. * **Management:** * **Immediate:** Cover the wound with sterile saline-soaked gauze. * **Definitive:** Urgent re-operation and secondary closure using **tension sutures** (interrupted heavy non-absorbable sutures). * **Risk Factors:** Malnutrition (hypoalbuminemia), Vitamin C deficiency, chronic cough, obesity, and emergency surgeries.
Question 72: A 72-year-old woman with atrial fibrillation is on warfarin and is scheduled for ventral hernia repair. She was advised to stop warfarin several days before surgery and was hospitalized for heparinization. During her hospital stay, she developed severe abdominal and flank pain. Her prothrombin time (PT) is normal, but her activated partial thromboplastin time (aPTT) is elevated. An abdominal CT scan revealed a large retroperitoneal hematoma. Which of the following should be administered to reverse the effects of heparin?
- A. Thrombin
- B. Vitamin K
- C. Protamine sulfate (Correct Answer)
- D. Aprotinin
Explanation: **Explanation:** The patient is experiencing a **retroperitoneal hematoma**, a known complication of heparin therapy. Heparin acts by binding to antithrombin III, which inactivates thrombin and Factor Xa. The clinical scenario shows an elevated aPTT (which monitors the intrinsic pathway affected by heparin) and a normal PT (indicating warfarin has been successfully cleared). **1. Why Protamine Sulfate is correct:** Protamine sulfate is the specific antidote for heparin. It is a highly alkaline (positive charge) protein that binds to the strongly acidic (negative charge) heparin molecule to form a stable, inactive **salt complex** through ionic bonding. This neutralization occurs rapidly. * **Dosing:** 1 mg of protamine neutralizes approximately 100 units of heparin. **2. Why other options are incorrect:** * **Thrombin (Option A):** This is a topical hemostatic agent used for surface bleeding; it cannot be used systemically to reverse heparin. * **Vitamin K (Option B):** This is the reversal agent for **Warfarin**. It acts by promoting the hepatic synthesis of Factors II, VII, IX, and X. It has no effect on heparin and takes hours to work. * **Aprotinin (Option D):** An antifibrinolytic agent (plasmin inhibitor) formerly used to reduce bleeding in cardiac surgery, but it does not neutralize heparin. **Clinical Pearls for NEET-PG:** * **Monitoring:** Heparin is monitored by **aPTT**, while Warfarin is monitored by **PT/INR**. * **LMWH Reversal:** Protamine only partially reverses Low Molecular Weight Heparin (LMWH) (approx. 60-75%). * **Side Effect:** Rapid administration of protamine can cause **hypotension**, bradycardia, and anaphylaxis (especially in patients with fish allergies or those using NPH insulin). * **Half-life:** Heparin has a short half-life (approx. 60-90 mins); if bleeding is minor, simply stopping the infusion may suffice. In this case, the hematoma necessitates active reversal.
Question 73: Massive blood transfusion is defined as?
- A. 350 ml in 5 minutes
- B. 500 ml in 5 minutes
- C. 1 liter in 5 minutes
- D. Replacement of the entire blood volume (Correct Answer)
Explanation: **Explanation:** Massive Blood Transfusion (MBT) is clinically defined based on the volume of blood replaced within a specific timeframe, reflecting a life-threatening hemorrhagic state. **Why the Correct Answer is Right:** The most widely accepted definition of MBT is the **replacement of a patient’s total blood volume within 24 hours**. In an average adult, this equates to approximately 10 units of packed red blood cells (PRBCs). Other definitions include the replacement of 50% of the total blood volume within 3 hours or a rate of loss exceeding 150 ml/min. The goal of identifying MBT is to trigger "Massive Transfusion Protocols" (MTP) to prevent the "Lethal Triad" of trauma. **Why the Incorrect Options are Wrong:** * **Options A, B, and C:** These options describe specific rates of infusion (e.g., 1 liter in 5 minutes). While these represent rapid resuscitation in hemorrhagic shock, they do not meet the standardized definition of MBT, which focuses on the **cumulative volume** relative to the patient's total circulatory capacity rather than a single 5-minute bolus. **High-Yield Clinical Pearls for NEET-PG:** * **The Lethal Triad:** MBT aims to combat **Acidosis, Hypothermia, and Coagulopathy**. * **MTP Ratio:** Modern protocols recommend a **1:1:1 ratio** (1 unit PRBC : 1 unit FFP : 1 unit Platelets) to mimic whole blood and prevent dilutional coagulopathy. * **Complications of MBT:** * **Hypocalcemia:** Due to citrate toxicity (citrate binds calcium). * **Hyperkalemia:** Due to RBC lysis in stored blood. * **Hypothermia:** If blood is not warmed. * **TRALI:** Transfusion-Related Acute Lung Injury (most common cause of transfusion-related death).
Question 74: All electrolyte abnormalities are seen in the immediate postoperative period, except:
- A. Negative Nitrogen balance
- B. Hypokalemia
- C. Glucose intolerance
- D. Hyponatremia (Correct Answer)
Explanation: **Explanation:** The metabolic response to surgical stress is characterized by a surge in "stress hormones" (Catecholamines, Cortisol, Glucagon, and Growth Hormone) and the activation of the Renin-Angiotensin-Aldosterone System (RAAS). **Why Hyponatremia is the correct answer:** In the immediate postoperative period, there is a significant increase in **Antidiuretic Hormone (ADH)** secretion. ADH causes water retention in the distal tubules. Additionally, Aldosterone causes **sodium retention** and potassium excretion. While "dilutional hyponatremia" can occur if excessive hypotonic fluids are given, the primary physiological response to stress is the **retention of sodium**. Therefore, absolute hyponatremia is not a standard physiological feature of the surgical stress response. **Analysis of Incorrect Options:** * **Negative Nitrogen Balance:** Surgical stress triggers a catabolic state. Muscle protein is broken down into amino acids for gluconeogenesis, leading to increased nitrogen excretion in urine, resulting in a negative nitrogen balance. * **Hypokalemia:** Increased Aldosterone levels act on the kidneys to reabsorb sodium in exchange for potassium and hydrogen ions. This leads to increased urinary potassium loss, commonly causing hypokalemia. * **Glucose Intolerance:** Cortisol and Catecholamines induce peripheral insulin resistance and stimulate hepatic glycogenolysis and gluconeogenesis. This results in "stress-induced hyperglycemia" or glucose intolerance. **NEET-PG High-Yield Pearls:** * **Phase of Injury:** The immediate period is the "Ebb phase" (decreased BMR), followed by the "Flow phase" (increased BMR/catabolism). * **Most common electrolyte abnormality post-op:** Hypokalemia (due to RAAS activation). * **ADH Secretion:** Post-op ADH elevation usually lasts for 3–5 days; hence, fluid overload must be avoided during this window. * **Modification:** The metabolic response can be blunted by effective analgesia (epidural anesthesia) and minimally invasive surgery.
Question 75: Which of the following statements is true regarding the biochemical changes that occur in burns?
- A. Lipogenesis
- B. Glutamine release (Correct Answer)
- C. Decreased catecholamines
- D. Protein synthesis
Explanation: **Explanation:** Burns trigger a profound **hypermetabolic response**, characterized by a massive systemic inflammatory reaction and a state of extreme catabolism. **Why Glutamine Release is Correct:** During major trauma or burns, the body enters a state of negative nitrogen balance. Skeletal muscle undergoes significant proteolysis to provide amino acids for gluconeogenesis and acute-phase protein synthesis. **Glutamine** and alanine are the primary amino acids released from skeletal muscle into the circulation. Glutamine is essential as it serves as a primary fuel source for rapidly dividing cells like enterocytes and immune cells (lymphocytes/macrophages). Because the body’s demand exceeds its production capacity during burns, glutamine is considered a "conditionally essential" amino acid. **Analysis of Incorrect Options:** * **A & D. Lipogenesis and Protein Synthesis:** These are **anabolic** processes. In the flow phase of burn injury, the body is in a **catabolic** state. Instead of synthesis, there is massive **lipolysis** (breakdown of fats into free fatty acids) and **proteolysis** (breakdown of muscle protein) to meet the increased energy demands. * **C. Decreased Catecholamines:** Burn injury causes a massive surge in "stress hormones," including **catecholamines (epinephrine/norepinephrine)**, glucagon, and cortisol. These hormones drive the hypermetabolic state, tachycardia, and increased basal metabolic rate (BMR). **High-Yield Clinical Pearls for NEET-PG:** * **Hypermetabolism:** A major burn can increase the BMR by up to **100% (double)**. * **Insulin Resistance:** Burns induce a state of "stress diabetes" due to high catecholamines and cortisol. * **Preferred Fuel:** While the body breaks down protein, the primary fuel source for the hypermetabolic response is **glucose** (via gluconeogenesis). * **Temperature:** The hypothalamic set-point is increased in burn patients, leading to a higher core body temperature (hyperthermia).
Question 76: Four days after undergoing subtotal gastrectomy for stomach cancer, a 58-year-old woman complains of right leg and thigh pain, swelling, redness, and tenderness on examination. Deep vein thrombosis is suspected. What is the initial test to establish the diagnosis?
- A. Venography
- B. Venous duplex ultrasound (Correct Answer)
- C. Impedance plethysmography
- D. Radio-labeled fibrinogen
Explanation: **Explanation:** The clinical presentation of unilateral leg pain, swelling, redness, and tenderness in a post-operative patient (especially after major abdominal surgery like gastrectomy) is highly suggestive of **Deep Vein Thrombosis (DVT)**. **1. Why Venous Duplex Ultrasound is correct:** Venous duplex ultrasound (combining B-mode imaging and Doppler) is the **initial and preferred diagnostic test** for suspected DVT. It is non-invasive, highly sensitive (>95%), and specific for proximal DVT. The primary diagnostic criterion is the **lack of compressibility** of the vein under the ultrasound probe. It has replaced more invasive or less accurate tests in standard clinical practice. **2. Why the other options are incorrect:** * **Venography (Option A):** Historically the "Gold Standard," it involves injecting contrast into the venous system. It is now rarely used because it is invasive, carries a risk of contrast-induced nephropathy/allergy, and may actually trigger thrombosis. * **Impedance Plethysmography (Option C):** This measures changes in electrical resistance to detect blood flow obstruction. It is less sensitive than ultrasound, especially for non-occlusive or calf thrombi, and is largely obsolete. * **Radio-labeled Fibrinogen (Option D):** This test detects active fibrin deposition. It is time-consuming (takes 24–72 hours), involves radiation, and is no longer used in acute clinical settings. **Clinical Pearls for NEET-PG:** * **Virchow’s Triad:** Stasis, endothelial injury, and hypercoagulability (all present in post-op cancer patients). * **Wells Score:** Used to determine the pre-test probability of DVT before ordering imaging. * **D-dimer:** Has a high **negative predictive value**; it is used to rule out DVT in low-risk patients but is often non-specifically elevated in post-operative patients. * **Gold Standard:** Contrast Venography (though Duplex US is the "Initial/Best" test).
Question 77: A significant increase in energy expenditure, approximately 100% over normal or two times greater than normal, is typically observed in patients with which of the following conditions?
- A. Pyloric obstruction due to a chronic duodenal ulcer
- B. Fracture of the femur
- C. Perforated diverticulitis of the colon
- D. Severe thermal burns involving more than 30% of the total body surface area (BSA) (Correct Answer)
Explanation: ### Explanation The metabolic response to injury is characterized by a "hypermetabolic state" where the **Basal Metabolic Rate (BMR)** increases in proportion to the severity of the insult. This is driven by the release of catecholamines, cortisol, and inflammatory cytokines. **1. Why Option D is Correct:** Severe thermal burns (>30-40% TBSA) represent the most extreme form of metabolic stress. In these patients, the Resting Energy Expenditure (REE) can increase by **100% or more (2x normal)**. This is due to massive heat loss from evaporation, systemic inflammation, and the high energy demand required for tissue repair and thermoregulation. **2. Why Other Options are Incorrect:** * **Option A (Pyloric Obstruction):** This condition typically leads to starvation and dehydration rather than hypermetabolism. In states of uncomplicated starvation, the BMR actually **decreases** (by about 10-15%) as the body conserves energy. * **Option B (Fracture of Femur):** A long bone fracture causes a mild to moderate increase in energy expenditure, typically around **15-25%** above baseline. * **Option C (Perforated Diverticulitis):** Severe sepsis or peritonitis increases the metabolic rate significantly, but usually in the range of **20-50%**, which is substantially lower than the surge seen in major burns. **3. High-Yield Clinical Pearls for NEET-PG:** * **Cuthbertson’s Phases:** Remember the **Ebb phase** (initial 24-48 hours; ↓ BMR, ↓ Cardiac Output) followed by the **Flow phase** (Hypermetabolic state; ↑ BMR, ↑ Glucose, ↑ CO). * **Hierarchy of Hypermetabolism:** Burns (>100%) > Sepsis (20-50%) > Skeletal Trauma (15-30%) > Elective Surgery (5-10%) > Starvation (-10%). * **Preferred Fuel:** In the hypermetabolic flow phase, the body primarily utilizes **lipids and amino acids** (proteolysis) for energy, leading to significant muscle wasting if not managed.
Question 78: What is the most important consideration in a patient with borderline pulmonary function undergoing lung resection?
- A. The amount of nonfunctioning lung tissue to be removed
- B. The amount of functioning lung tissue to be removed
- C. Experience of the surgical team
- D. Elevated pulmonary artery pressure (Correct Answer)
Explanation: **Explanation:** In patients undergoing lung resection, the primary physiological challenge is the sudden reduction in the pulmonary vascular bed. While the loss of ventilatory volume is significant, the **hemodynamic impact** on the right heart is the most critical determinant of perioperative mortality. **Why "Elevated Pulmonary Artery Pressure" is the correct answer:** In a patient with borderline pulmonary function, the remaining pulmonary vasculature must accommodate the entire cardiac output. If the patient already has **Pulmonary Hypertension (PH)** or elevated pulmonary artery pressure, the resection further reduces the vascular cross-sectional area. This leads to a sharp increase in right ventricular afterload, potentially causing acute right heart failure (cor pulmonale), which is the leading cause of death following major lung resection. A mean pulmonary artery pressure >25 mmHg is often considered a high-risk contraindication. **Analysis of Incorrect Options:** * **A & B (Amount of lung tissue):** While the volume of functioning lung tissue (FEV1 and DLCO) is vital for assessing postoperative respiratory failure, it is secondary to the hemodynamic stability of the pulmonary circuit. Removing nonfunctioning tissue (Option A) is actually better tolerated than removing functioning tissue (Option B), but neither is as critical as the baseline pulmonary pressure. * **C (Experience of the surgical team):** While surgical skill reduces complication rates, it is a subjective factor and not a physiological "consideration" or contraindication for the patient’s fitness. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Assessment:** Preoperative FEV1 and DLCO are the best predictors of respiratory reserve. A **predicted postoperative (ppo) FEV1 >40%** is generally considered safe. * **The "Stair Climbing" Test:** A simple bedside test; the ability to climb 3 flights of stairs correlates with an FEV1 >1.75L. * **Split Function Study:** If FEV1 is borderline, a **V/Q scan** is performed to calculate the contribution of the specific lobe/lung to be removed. * **Absolute Contraindication:** A PaCO2 >45 mmHg or PaO2 <50 mmHg on room air indicates severe compromise.
Question 79: A 65-year-old man undergoes a low anterior resection for rectal cancer. On the fifth day in hospital, his physical examination shows a temperature of 39°C (102°F), blood pressure of 150/90 mm Hg, pulse of 110 beats per minute and regular, and respiratory rate of 28 breaths per minute. A computed tomography (CT) scan of the abdomen reveals an abscess in the pelvis. Which of the following most accurately describes his present condition?
- A. Systemic inflammatory response syndrome (SIRS)
- B. Sepsis (Correct Answer)
- C. Severe sepsis
- D. Septic shock
Explanation: ### Explanation The patient is presenting with a postoperative complication (pelvic abscess) following a major abdominal surgery. To identify the correct stage of the inflammatory response, we must apply the **SIRS and Sepsis criteria**. **1. Why Sepsis is Correct:** Sepsis is defined as **SIRS + a documented or suspected source of infection**. This patient meets the SIRS criteria by having: * **Temperature:** 39°C (>38°C) * **Heart Rate:** 110 bpm (>90 bpm) * **Respiratory Rate:** 28 breaths/min (>20 breaths/min) Additionally, the CT scan confirms a **pelvic abscess**, providing a definitive source of infection. Therefore, SIRS + Infection = **Sepsis**. **2. Why the Other Options are Incorrect:** * **SIRS (Systemic Inflammatory Response Syndrome):** This is a non-specific clinical response to a variety of insults (trauma, burns, pancreatitis). While the patient has SIRS, the presence of a confirmed infection (abscess) upgrades the diagnosis to Sepsis. * **Severe Sepsis:** Historically defined as sepsis associated with **organ dysfunction** (e.g., oliguria, altered mental status, lactic acidosis) or hypotension that responds to fluids. This patient’s BP is 150/90 mm Hg, and no organ failure is mentioned. * **Septic Shock:** Defined as sepsis with **persistent hypotension** (MAP <65 mmHg) despite adequate fluid resuscitation, requiring vasopressors. This patient is currently hypertensive/stable. **Clinical Pearls for NEET-PG:** * **SIRS Criteria (Need 2/4):** Temp >38°C or <36°C; HR >90; RR >20 or PaCO2 <32 mmHg; WBC >12,000 or <4,000 (or >10% bands). * **qSOFA Score:** In modern practice (Sepsis-3), the qSOFA (Quick SOFA) is used bedside: RR ≥22, Altered Mentation (GCS <15), and Systolic BP ≤100 mmHg. * **Post-op Fever Timeline:** Fever on Day 5 ("Walking") is classically associated with Wound infection or deep-seated abscesses (like in this case).
Question 80: A patient with meningioma and an inflammatory edematous lesion is scheduled for surgery. Which of the following represents a mistake in the junior resident's pre-operative notes?
- A. Discontinue steroids (Correct Answer)
- B. Wash head with shampoo
- C. Check antibiotic sensitivity
- D. Continue antiepileptic drugs
Explanation: **Explanation:** The correct answer is **A. Discontinue steroids**. In neurosurgery, specifically for tumors like meningiomas associated with "inflammatory edematous lesions" (peritumoral edema), steroids (typically Dexamethasone) are a cornerstone of preoperative management. They stabilize the blood-brain barrier and reduce vasogenic edema, thereby lowering intracranial pressure (ICP) and improving the surgical field. Discontinuing them preoperatively would be a clinical mistake as it could lead to neurological deterioration or herniation. **Analysis of other options:** * **B. Wash head with shampoo:** This is a standard preoperative protocol to reduce the microbial load on the scalp, minimizing the risk of Surgical Site Infections (SSI). * **C. Check antibiotic sensitivity:** Preoperative prophylaxis is mandatory in neurosurgery. Ensuring the patient is not allergic and that the chosen antibiotic is appropriate is a vital safety step. * **D. Continue antiepileptic drugs (AEDs):** Patients with intracranial tumors are at high risk for seizures. AEDs must be continued perioperatively (often switched to IV formulations) to prevent intraoperative or postoperative status epilepticus. **Clinical Pearls for NEET-PG:** * **Steroid of Choice:** Dexamethasone is preferred in neurosurgery due to its high potency, long half-life, and minimal mineralocorticoid (salt-retaining) activity. * **Vasogenic vs. Cytotoxic Edema:** Steroids are highly effective for **vasogenic edema** (seen in tumors/abscesses) but have little to no role in **cytotoxic edema** (seen in acute ischemic stroke). * **Pre-op Fasting (ASA Guidelines):** 2 hours for clear liquids, 6 hours for a light meal, and 8 hours for fatty foods.
Practice by Chapter
Preoperative Risk Assessment
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Perioperative Management of Comorbidities
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Preparation of Patient for Surgery
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Informed Consent Process
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Post-Anesthesia Care
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Pain Management
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Wound Care and Dressings
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Drain Management
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Postoperative Complications Detection
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Early Ambulation and Rehabilitation
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Enhanced Recovery After Surgery (ERAS) Protocols
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Discharge Planning and Follow-up
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