Preoperative and Postoperative Care Practice Questions

Q: What is the amount of potassium (K+) in Ringer's Lactate solution?

4 mEq/L. **Explanation:** Ringer’s Lactate (RL), also known as Hartmann’s solution, is a balanced crystalloid solution designed to closely mimic the electrolyte composition of human plasma. It is the fluid of choice for resuscitation in trauma, burns, and intraoperative maintenance. **Why 4 mEq/L is correct:** The standard composition of Ringer’s Lactate includes **4 mEq/L of Potassium**. This concentration is physiological, matching the normal range of potassium in human extracellular fluid (3.5–5.0 mEq/L). Because it contains potassium, RL must be used with caution in patients with renal failure or hyperkalemia. **Analysis of Incorrect Options:** * **A (2 mEq/L):** This is too low and does not represent the standard formulation of any common isotonic crystalloid. * **C (5 mEq/L):** While 5 mEq/L is within the normal range for plasma, it is higher than the specific concentration manufactured in RL. * **D (6 mEq/L):** This concentration would be considered hyperkalemic and is not found in standard RL. **High-Yield Clinical Pearls for NEET-PG:** * **Composition of RL:** Sodium (130–131 mEq/L), Chloride (109–111 mEq/L), Potassium (4 mEq/L), Calcium (3 mEq/L), and Lactate (28 mEq/L). * **Metabolism:** Lactate is converted into **bicarbonate** in the liver; hence, RL is used to treat metabolic acidosis. * **Contraindications:** Avoid RL in patients receiving blood transfusions (Calcium can cause clotting in the tubing if Citrate is present) and in patients with severe liver disease (inability to metabolize lactate). * **Osmolarity:** RL is slightly hypotonic (approx. 273 mOsm/L) compared to plasma (285–295 mOsm/L).

Q: Fever increases water losses by how many mL per degree Celsius?

200 mL. **Explanation:** The correct answer is **200 mL (Option B)**. This question pertains to the calculation of **insensible water loss**, which is critical for managing fluid balance in surgical patients. **1. Why 200 mL is correct:** Under normal physiological conditions, an adult loses approximately 600–900 mL of water daily through insensible routes (skin and lungs). However, fever significantly increases this loss due to increased metabolic rate and respiratory rate (tachypnea). For every **1°C rise** in body temperature above 37°C, the insensible water loss increases by approximately **200 mL/day**. In clinical practice, this must be added to the maintenance fluid requirements to prevent dehydration. **2. Why other options are incorrect:** * **100 mL (Option A):** This is an underestimation. While some older texts mention 10% of total insensible loss, the standard surgical teaching (Bailey & Love) and clinical guidelines recognize 200 mL as the standard replacement volume per degree. * **400 mL & 800 mL (Options C & D):** These values are too high for a single degree Celsius rise. Such volumes are more characteristic of losses seen in severe hyperventilation or significant diaphoresis (sweating), rather than just the baseline increase from fever. **High-Yield Clinical Pearls for NEET-PG:** * **Total Insensible Loss:** Roughly 10–12 mL/kg/day. * **Sweating:** Unlike insensible loss (pure water), sweat is a hypotonic fluid containing sodium (~30–50 mEq/L). * **Hypermetabolic states:** Fever also increases the Basal Metabolic Rate (BMR) by approximately **13% per degree Celsius**. * **Formula for Maintenance:** Remember the **4-2-1 rule** for hourly fluid maintenance (4 mL/kg for first 10kg, 2 mL/kg for next 10kg, 1 mL/kg for remaining weight).

Q: Which of the following is NOT a complication of total parenteral nutrition?

Hyperphosphatemia. **Explanation:** The correct answer is **C. Hyperphosphatemia**. Total Parenteral Nutrition (TPN) is more commonly associated with **Hypophosphatemia**, particularly as a hallmark of **Refeeding Syndrome**. When a malnourished patient receives concentrated glucose, insulin release shifts phosphate from the extracellular to the intracellular compartment to facilitate glycolysis and ATP production, leading to dangerously low serum phosphate levels. **Analysis of Options:** * **Hyperammonemia (A):** This can occur due to an excessive protein load or deficiencies in specific amino acids (like arginine) required for the urea cycle, especially in patients with underlying hepatic impairment. * **Neutrophil dysfunction (B):** Hyperglycemia (common in TPN) and certain lipid emulsions can impair chemotaxis and the phagocytic activity of neutrophils, increasing the risk of catheter-related bloodstream infections (CRBSI). * **Hypercholesterolemia (D):** Prolonged TPN, especially with high-lipid formulations, can lead to hyperlipidemia and hepatic steatosis (TPN-associated liver disease). **High-Yield Clinical Pearls for NEET-PG:** * **Refeeding Syndrome:** Characterized by "Low Phos, Low Mag, Low K" (Hypophosphatemia, Hypomagnesemia, and Hypokalemia) plus Thiamine deficiency. * **Most common complication of TPN:** Catheter-related sepsis (usually *Staph. epidermidis*). * **Most common metabolic complication:** Hyperglycemia. * **Hepatobiliary complications:** Acalculous cholecystitis and biliary sludge are common due to lack of enteral stimulation and gallbladder stasis. * **Monitoring:** Check serum electrolytes daily and liver function tests weekly during the initiation phase.

Q: Postoperative pancreatitis is most commonly seen following which type of surgery?

Splenectomy. **Explanation:** **Correct Answer: B. Splenectomy** Postoperative pancreatitis is a recognized complication of abdominal surgeries, but it is most frequently associated with **Splenectomy**. The underlying medical concept is the **intimate anatomical relationship** between the splenic hilum and the **tail of the pancreas**. During the mobilization of the spleen and the ligation of the splenic vessels, the pancreatic tail—which often lies within the splenorenal ligament—is highly susceptible to direct mechanical trauma, ischemia, or accidental devascularization. This leads to the leakage of pancreatic enzymes and subsequent localized or systemic inflammation. **Analysis of Incorrect Options:** * **A. Billroth type I:** While gastroduodenal surgeries involve the head of the pancreas, the risk of direct injury is lower compared to the direct proximity involved in a splenectomy. * **C. Nephrectomy:** Although the left kidney is posterior to the pancreas, the surgical plane is usually retroperitoneal, making direct pancreatic injury less common than during splenic hilar dissection. * **D. Roux-en-Y hepaticojejunostomy:** This procedure involves the biliary tree and jejunum. While it can cause "afferent loop syndrome" leading to secondary pancreatitis, it is not the most common cause compared to direct trauma during splenectomy. **Clinical Pearls for NEET-PG:** * **The "Tail" Danger:** The tail of the pancreas is the most common site of injury during splenectomy, often leading to a **pancreatic fistula** or a **pseudocyst** postoperatively. * **ERCP:** Outside of direct abdominal surgery, **ERCP** remains the most common *procedural* cause of postoperative/post-instrumentation pancreatitis. * **Biochemical Marker:** A routine postoperative rise in serum amylase is common after abdominal surgery, but clinical pancreatitis requires the presence of characteristic pain and significantly elevated enzymes.

Q: Following resection of the left colon, a 67-year-old obese woman develops left-sided leg edema due to deep-vein thrombosis. She is placed on anticoagulants, but after 2 weeks of warfarin (Coumadin), she develops a pulmonary embolus with slight hypoxemia. What should the next step in management involve?

Use of an inferior vena cava (IVC) filter. ### **Explanation** The correct management for this patient is the **insertion of an Inferior Vena Cava (IVC) filter**. **Why Option C is Correct:** The primary indication for an IVC filter is the **failure of anticoagulation** (as seen in this patient who developed a pulmonary embolism [PE] despite being on therapeutic warfarin for 2 weeks) or a **contraindication to anticoagulation** (e.g., active bleeding). Since the patient developed a new PE while on adequate therapy, the filter is necessary to mechanically prevent further life-threatening emboli from reaching the pulmonary circulation. **Why Other Options are Incorrect:** * **Option A:** Increasing the dose of anticoagulants is dangerous and ineffective. If a patient "breaks through" therapeutic levels, simply increasing the dose increases the risk of major hemorrhage without addressing the underlying failure. * **Option B:** Discontinuing anticoagulants would leave the patient unprotected against further clot propagation and recurrent PE, significantly increasing mortality. * **Option C:** A CT scan is diagnostic but not therapeutic. The diagnosis of PE is already clinically evident/implied, and the priority is immediate prevention of further embolization. **Clinical Pearls for NEET-PG:** * **Indications for IVC Filter:** 1. Failure of anticoagulation (recurrent PE despite therapy). 2. Contraindications to anticoagulation (e.g., recent neurosurgery, active GI bleed). 3. Complications of anticoagulation (e.g., heparin-induced thrombocytopenia). 4. Prophylaxis in very high-risk patients (e.g., massive pelvic fractures). * **Placement:** The filter is typically placed in the **infrarenal IVC** via the femoral or internal jugular vein. * **Gold Standard Diagnosis:** While CT Pulmonary Angiography (CTPA) is the investigation of choice for PE, **Pulmonary Angiography** remains the gold standard.

Question 1

What is true regarding wound dehiscence?

Accepted Answer

The management of wound dehiscence depends on the degree of evisceration and the condition of the bowel.

Answer

If dehiscence is suspected, close with continuous sutures of non-absorbable material.

Answer

Dehiscence typically occurs on the 2nd postoperative day.

Answer

A sudden gush of fluid may precede wound dehiscence.

Question 2

What is the amount of potassium (K+) in Ringer's Lactate solution?

Accepted Answer

4 mEq/L

Answer

2 mEq/L

Answer

5 mEq/L

Answer

6 mEq/L

Question 3

Fever increases water losses by how many mL per degree Celsius?

Accepted Answer

200 mL

Answer

100 mL

Answer

400 mL

Answer

800 mL

Question 4

Which of the following is a side effect of Total Parenteral Nutrition?

Accepted Answer

Fluid overload

Answer

Hyperglycemia

Answer

Fat embolism

Answer

Fractures of bones

Question 5

A 39-year-old woman with a known history of von Willebrand disease has a ventral hernia after a previous cesarean section and desires to undergo elective repair. Which of the following should be administered preoperatively?

Accepted Answer

Cryoprecipitate

Answer

High-purity factor VIII: C concentrates

Answer

Low-molecular-weight dextran

Answer

Fresh-frozen plasma (FFP)

Question 6

Which of the following is NOT a complication of total parenteral nutrition?

Accepted Answer

Hyperphosphatemia

Answer

Hyperammonemia

Answer

Neutrophil dysfunction

Answer

Hypercholesterolemia

Question 7

Postoperative pancreatitis is most commonly seen following which type of surgery?

Accepted Answer

Splenectomy

Answer

Billroth type I

Answer

Nephrectomy

Answer

Roux-en-Y hepaticojejunostomy

Question 8

Following resection of the left colon, a 67-year-old obese woman develops left-sided leg edema due to deep-vein thrombosis. She is placed on anticoagulants, but after 2 weeks of warfarin (Coumadin), she develops a pulmonary embolus with slight hypoxemia. What should the next step in management involve?

Accepted Answer

Use of an inferior vena cava (IVC) filter

Answer

Increasing the dose of anticoagulants

Answer

Discontinuing anticoagulants

Answer

CT scan of the leg and abdomen

Question 9

For which of the following patients is a home total parenteral nutrition (TPN) program most likely to be useful?

Accepted Answer

Short bowel syndrome

Answer

An untreatable disease

Answer

A short-term requirement for nutrition (less than 1 week)

Answer

Neoplasms with bowel obstruction

Question 10

A patient develops serous discharge from a surgical wound on the 6th postoperative day after a hemicolectomy. Which of the following actions should be taken?

Accepted Answer

Perform an urgent laparotomy.

Answer

Dress the wound only.

Answer

Start IV fluids.

Answer

Perform a barium enema to check for anastomotic leak.

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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