Preoperative and Postoperative Care Practice Questions

Q: In cholecystectomy, when should fresh plasma be administered?

Just before operation. **Explanation:** In patients undergoing cholecystectomy who have underlying liver dysfunction or obstructive jaundice, the synthesis of vitamin K-dependent clotting factors (II, VII, IX, and X) is often impaired. **Fresh Frozen Plasma (FFP)** is administered to provide these essential clotting factors and prevent intraoperative hemorrhage. **Why "Just before operation" is correct:** The primary reason for this timing is the **short half-life of clotting factors**, particularly **Factor VII**, which has a half-life of only **4 to 6 hours**. If FFP is administered too early (e.g., 6 or 12 hours before), the concentration of these factors will drop below the therapeutic level by the time the surgeon makes the first incision. Administering it "on-call" to the operating theater ensures peak hemostatic efficacy during the most critical period of the surgery. **Analysis of Incorrect Options:** * **6 hours before operation:** By the time the surgery begins, the activity of Factor VII would have already diminished by half, increasing the risk of bleeding. * **12 hours after operation:** This is reactive rather than prophylactic. While it may help with post-operative oozing, it fails to prevent the primary risk of intraoperative hemorrhage. **Clinical Pearls for NEET-PG:** * **Vitamin K vs. FFP:** In elective cases with deranged PT/INR, Vitamin K is given parenterally for 3 days. If the surgery is **emergency** or the INR remains high despite Vitamin K, FFP is the treatment of choice. * **Dosage:** The standard dose of FFP is **10–15 mL/kg**. * **Indication:** FFP is generally indicated when the **Prothrombin Time (PT)** is >1.5 times the control or the **INR** is >1.5. * **Storage:** FFP is stored at **-18°C or colder** and must be used within 24 hours of thawing to maintain factor activity.

Q: What is the preferred route for administering total parenteral nutrition (TPN) for a patient requiring it for less than 14 days?

Peripheral vein. ### Explanation The choice of access for Total Parenteral Nutrition (TPN) is primarily determined by the **duration of therapy** and the **osmolarity** of the solution. **1. Why Peripheral Vein is Correct:** For short-term nutritional support (typically **<14 days**), **Peripheral Parenteral Nutrition (PPN)** is preferred. It avoids the risks associated with central venous catheterization (e.g., pneumothorax, central line-associated bloodstream infections). However, to prevent thrombophlebitis, PPN solutions must have a lower osmolarity (usually ** 14 days**) or when highly hypertonic solutions (>900 mOsm/L) are required to meet high caloric demands. Using the IJV for short-term needs unnecessarily increases the risk of major complications. * **External Jugular Vein (EJV):** While more superficial than the IJV, it is still considered a route for central access if the catheter tip reaches the superior vena cava. It is technically difficult to maintain for TPN and is not the standard "preferred" route for short-term peripheral administration. **3. High-Yield Clinical Pearls for NEET-PG:** * **Osmolarity Limit:** The maximum osmolarity tolerated by a peripheral vein is **900 mOsm/L**. Solutions exceeding this must be given via a central line to ensure rapid dilution in high-flow vessels. * **Most Common Complication of TPN:** Catheter-related sepsis (infection). * **Most Common Metabolic Complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by **Hypophosphatemia** (most common), hypokalemia, and hypomagnesemia upon restarting nutrition in a starved patient. * **Duration Rule:** 2 weeks = Central (CVC/PICC).

Q: A patient undergoes surgery in the pelvic region. Which vein is most likely to result in thrombosis?

Calf vein. **Explanation:** The correct answer is **Calf vein (Option C)**. Deep Vein Thrombosis (DVT) is a major postoperative complication, especially in pelvic and orthopedic surgeries. According to Virchow’s Triad (stasis, endothelial injury, and hypercoagulability), venous stasis is the primary driver during surgery due to immobilization and the effects of anesthesia. **Why Calf Veins?** Statistically, the **deep veins of the calf (soleal and gastrocnemius sinuses)** are the most common site for the initiation of thrombus formation. These veins are large, thin-walled, and lack valves, making them highly susceptible to blood pooling (stasis) when the calf muscle pump is inactive during surgery. While many calf thrombi are asymptomatic and resolve spontaneously, they serve as the precursor for proximal extension. **Analysis of Incorrect Options:** * **Iliac Vein (A) & Femoral Vein (B):** While these are "proximal" veins and carry a much higher risk of causing Pulmonary Embolism (PE) if they thrombose, they are **not** the most common initial site. Most iliofemoral thrombi actually originate in the calf and propagate upwards. * **Inferior Vena Cava (D):** Primary IVC thrombosis is rare and usually associated with congenital anomalies, tumors (like RCC), or long-term indwelling filters/catheters. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for DVT initiation:** Calf veins (Soleal plexus). * **Most common source of clinically significant Pulmonary Embolism:** Iliofemoral veins (proximal DVT). * **Gold Standard Investigation for DVT:** Contrast Venography (rarely used now). * **Investigation of Choice (Initial):** Duplex Ultrasonography. * **Prophylaxis:** Early ambulation is the most effective physiological measure; LMWH is the pharmacological gold standard.

Q: A 63-year-old man with a 40-pack per year smoking history undergoes a low anterior resection for rectal cancer and on postoperative day 5 develops a fever, new infiltrate on chest x-ray, and leukocytosis. He is transferred to the ICU for treatment of his pneumonia because of clinical deterioration. Which of the following is a sign of early sepsis?

Peripheral vasodilation. **Explanation** The clinical presentation of fever, new pulmonary infiltrate, and leukocytosis in a postoperative patient suggests **Hospital-Acquired Pneumonia (HAP)** progressing to **Sepsis**. **1. Why Peripheral Vasodilation is Correct:** In the early stages of sepsis (often called **"Warm Shock"** or Hyperdynamic phase), the body releases inflammatory mediators (such as Nitric Oxide, Prostaglandins, and Cytokines). These mediators cause significant **peripheral vasodilation** and a decrease in systemic vascular resistance (SVR). To compensate for this drop in SVR and maintain tissue perfusion, the heart increases its rate and stroke volume, leading to a high cardiac output and warm, flushed extremities. **2. Why the Other Options are Incorrect:** * **Respiratory Acidosis:** Early sepsis typically presents with **Respiratory Alkalosis**. The inflammatory response and fever stimulate the respiratory center, causing tachypnea and "blowing off" CO₂, leading to a rise in pH. * **Decreased Cardiac Output:** This is a feature of **late sepsis** (Cold Shock) or cardiogenic shock. In early sepsis, the cardiac output is characteristically **increased** (Hyperdynamic state). * **Hypoglycemia:** Sepsis is a stress state that triggers the release of cortisol and catecholamines, which promote gluconeogenesis and glycogenolysis. Therefore, **hyperglycemia** (stress-induced) is the common finding. Hypoglycemia is rare and usually signifies hepatic failure or exhaustion of glycogen stores in end-stage sepsis. **Clinical Pearls for NEET-PG:** * **Hemodynamic Profile of Early Sepsis:** ↓ SVR, ↑ Cardiac Output, ↑ Mixed Venous Oxygen Saturation (SvO₂). * **qSOFA Score:** A quick bedside tool for sepsis—1. Altered mental status (GCS <15), 2. Systolic BP ≤100 mmHg, 3. Respiratory rate ≥22/min. * **Postoperative Fever (The 5 W's):** This patient (POD 5) fits the timeline for **W**ind (Pneumonia) or **W**ound (Infection).

Q: Which of the following is not usually a post-operative complication?

Hyponatremia. The metabolic response to surgical stress is characterized by a neuroendocrine surge designed to maintain circulatory volume and mobilize energy. **Explanation of the Correct Answer:** **A. Hyponatremia:** This is **not** a typical physiological response to surgery. Following surgery, there is an increased secretion of **Aldosterone** (via the Renin-Angiotensin-Aldosterone System) and **ADH** (Vasopressin) due to stress and perceived volume loss. Aldosterone causes **sodium retention** and water reabsorption. While "dilutional hyponatremia" can occur if excessive hypotonic fluids are administered iatrogenically, the body’s primary physiological drive post-surgery is to conserve sodium. **Explanation of Incorrect Options:** * **B. Hypokalemia:** Aldosterone acts on the distal renal tubules to reabsorb sodium in exchange for **potassium excretion**. This leads to increased urinary potassium loss, making hypokalemia a common post-operative finding. * **C. Glucose Intolerance:** Surgical stress triggers the release of "counter-regulatory hormones" (Cortisol, Catecholamines, Glucagon, and Growth Hormone). these promote glycogenolysis and gluconeogenesis while inducing peripheral **insulin resistance**, leading to post-operative hyperglycemia. * **D. Negative N2 Balance:** Surgery induces a **catabolic state**. Skeletal muscle protein is broken down into amino acids to provide substrates for gluconeogenesis and acute-phase protein synthesis. This results in increased nitrogen excretion in urine, exceeding intake (Negative Nitrogen Balance). **NEET-PG High-Yield Pearls:** * **Phase of Injury:** The initial period after surgery is called the **"Ebb Phase"** (decreased BMR), followed by the **"Flow Phase"** (hypermetabolism). * **Most common electrolyte abnormality** post-operatively is often hypokalemia. * **ADH secretion** persists for 2–3 days post-op, making patients prone to fluid overload if not monitored.

Q: What is the most common postoperative complication in polycythemia vera?

Cardiopulmonary complication. ### Explanation Polycythemia Vera (PV) is a myeloproliferative neoplasm characterized by an uncontrolled increase in red blood cell mass. This leads to **hyperviscosity** and an increased risk of both thrombosis and hemorrhage. **Why Cardiopulmonary Complications are Correct:** In the postoperative period, patients with PV are at a significantly high risk (up to 30%) of vascular complications. Hyperviscosity leads to sluggish blood flow, which, combined with the prothrombotic state of surgery, results in **thromboembolic events**. The most common and serious manifestations are **congestive heart failure (CHF)**, **myocardial infarction (MI)**, and **pulmonary embolism (PE)**. These are collectively categorized as cardiopulmonary complications. **Analysis of Incorrect Options:** * **A. Infection:** While any surgical patient is at risk for infection, it is not specifically increased by the pathophysiology of PV compared to the general population. * **C. Hemolysis:** PV involves the overproduction of cells, not their premature destruction. Hemolysis is more characteristic of conditions like G6PD deficiency or autoimmune hemolytic anemia. * **D. Uremia:** While hyperuricemia is common in PV (due to high cell turnover), frank uremia (renal failure) is not a primary or most common postoperative complication. **High-Yield Clinical Pearls for NEET-PG:** * **Preoperative Goal:** The most important step to reduce surgical morbidity in PV is to bring the **Hematocrit (Hct) below 45%** (ideally <42%) for at least 3–4 months prior to elective surgery. * **Management:** This is achieved through repeated **phlebotomy** and sometimes myelosuppressive agents (e.g., Hydroxyurea). * **Paradox:** Patients with PV are also at risk for **postoperative hemorrhage** due to qualitative platelet dysfunction, despite having high platelet counts.

Question 1

In cholecystectomy, when should fresh plasma be administered?

Accepted Answer

Just before operation

Answer

6 hours before operation

Answer

6 hours before operation

Answer

12 hours after operation

Question 2

What is the preferred route for administering total parenteral nutrition (TPN) for a patient requiring it for less than 14 days?

Accepted Answer

Peripheral vein

Answer

Internal jugular vein (IJV)

Answer

External jugular vein (EJV)

Answer

None of the above

Question 3

A patient undergoes surgery in the pelvic region. Which vein is most likely to result in thrombosis?

Accepted Answer

Calf vein

Answer

Iliac vein

Answer

Femoral vein

Answer

Inferior vena cava (IVC)

Question 4

A patient with Crohn's disease underwent resection anastomosis. On the 7th postoperative day, the patient presents with an anastomotic site leak forming a fistula, with a daily leakage volume of 150-200 ml. There is no intra-abdominal collection, and the patient is hemodynamically stable without any other complaints. What is the next line of management?

Accepted Answer

Conservative treatment with observation for spontaneous resolution.

Answer

Laparotomy to inspect the leakage site and assess tissue margins.

Answer

Laparotomy to completely exteriorize the fistula.

Answer

Laparotomy with placement of lateral drains and observation.

Question 5

A 63-year-old man with a 40-pack per year smoking history undergoes a low anterior resection for rectal cancer and on postoperative day 5 develops a fever, new infiltrate on chest x-ray, and leukocytosis. He is transferred to the ICU for treatment of his pneumonia because of clinical deterioration. Which of the following is a sign of early sepsis?

Accepted Answer

Peripheral vasodilation

Answer

Respiratory acidosis

Answer

Decreased cardiac output

Answer

Hypoglycemia

Question 6

A 62-year-old woman undergoes a pancreaticoduodenectomy for a pancreatic head cancer. A jejunostomy is placed to facilitate nutritional repletion as she is expected to have a prolonged recovery. What is the best method for delivering postoperative nutrition?

Accepted Answer

Institution of enteral feeding via the jejunostomy tube within 24 hours postoperatively.

Answer

Institution of enteral feeding via the jejunostomy tube after return of bowel function as evidenced by passage of flatus or a bowel movement.

Answer

Institution of supplemental enteral feeding via the jejunostomy tube only if oral intake is inadequate after return of bowel function.

Answer

Institution of a combination of immediate trophic (15 mL/h) enteral feeds via the jejunostomy tube and parenteral nutrition to provide total nutritional support.

Question 7

A 62-year-old woman with a history of coronary artery disease presents with a pancreatic head tumor and undergoes a pancreaticoduodenectomy. Postoperatively, she develops a leak from the pancreaticojejunostomy anastomosis and becomes septic. A Swan-Ganz catheter is placed, which demonstrates an increased cardiac output and decreased systemic vascular resistance. She also develops acute renal failure and oliguria. Which of the following is an indication to start dopamine?

Accepted Answer

To increase coronary flow

Answer

To increase splanchnic flow

Answer

To decrease heart rate

Answer

To lower peripheral vascular resistance

Question 8

A 52-year-old man with gastric outlet obstruction secondary to a duodenal ulcer presents with hypochloremic, hypokalemic metabolic alkalosis. Which of the following is the most appropriate therapy for this patient?

Accepted Answer

Infusion of 0.9% NaCl with supplemental KCl until clinical signs of volume depletion are eliminated

Answer

Infusion of isotonic (0.15 N) HCl via a central venous catheter

Answer

Clamping the nasogastric tube to prevent further acid losses

Answer

Administration of acetazolamide to promote renal excretion of bicarbonate

Question 9

Which of the following is not usually a post-operative complication?

Accepted Answer

Hyponatremia

Answer

Hypokalemia

Answer

Glucose intolerance

Answer

Negative N2 balance

Question 10

What is the most common postoperative complication in polycythemia vera?

Accepted Answer

Cardiopulmonary complication

Answer

Infection

Answer

Hemolysis

Answer

Uremia

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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