Preoperative and Postoperative Care Practice Questions

Q: A female patient with steroid-resistant ITP underwent laparoscopic splenectomy. On postoperative day 3, she developed a fever. Which of the following is the most likely cause?

Left lower lobe consolidation. **Explanation:** Postoperative fever is categorized by the timing of its onset. In the early postoperative period (Days 1–3), pulmonary complications are the most common cause. **1. Why Option A is correct:** Following a splenectomy, especially via the laparoscopic route, the left diaphragm is often irritated or manipulated. This leads to splinting (reduced movement of the diaphragm due to pain) and shallow breathing, resulting in **atelectasis** or **consolidation** of the left lower lobe. On postoperative day 3, pulmonary issues (the "Wind" in the 5 W's of post-op fever) are the most frequent etiology. **2. Why the other options are incorrect:** * **Surgical Site Infection (B):** Typically presents between postoperative days 5 and 7 ("Wound"). It is unlikely to manifest as early as day 3 unless caused by *Clostridium* or *Group A Strep*. * **Intra-abdominal collection (C):** While a subphrenic abscess is a known complication of splenectomy, it usually presents later (Day 5–10) with a swinging pyrexia. * **Urinary Tract Infection (D):** UTIs ("Water") usually occur between days 3 and 5, often related to catheterization, but pulmonary causes remain statistically more likely on day 3 post-upper abdominal surgery. **Clinical Pearls for NEET-PG:** * **The 5 W’s of Post-op Fever:** **W**ind (Atelectasis/Pneumonia, Days 1-2), **W**ater (UTI, Days 3-5), **W**alking (DVT/PE, Days 4-6), **W**ound (Infection, Days 5-7), **W**onder drugs (Drug fever/IV lines, Day 7+). * **Splenectomy Specifics:** Left-sided pleural effusion or basal atelectasis is a classic "hidden" source of fever post-splenectomy. * **OPSI:** Overwhelming Post-Splenectomy Infection is a late, life-threatening complication, most commonly due to *Streptococcus pneumoniae*.

Q: What is the most common electrolyte imbalance that causes paralytic ileus?

Hypokalemia. **Explanation:** **Hypokalemia (Option C)** is the most common electrolyte abnormality leading to paralytic ileus. Potassium is essential for maintaining the resting membrane potential of smooth muscle cells. Low extracellular potassium levels cause hyperpolarization of these membranes, making it significantly harder for smooth muscle cells in the gastrointestinal tract to reach the threshold required for an action potential. This results in decreased or absent peristalsis, leading to the clinical presentation of abdominal distension, absent bowel sounds, and inability to pass flatus. **Analysis of Incorrect Options:** * **Hyponatremia (Option A):** While severe hyponatremia can cause neurological symptoms like confusion or seizures, it does not directly impair intestinal smooth muscle contractility. * **Hypernatremia (Option B):** Typically presents with signs of dehydration and CNS irritability rather than gastrointestinal paralysis. * **Hyperkalemia (Option D):** High potassium levels increase cell excitability and are more closely associated with life-threatening cardiac arrhythmias (e.g., peaked T-waves) rather than ileus. **Clinical Pearls for NEET-PG:** * **The "Big Three" of Ileus:** The most common causes of postoperative ileus are **Surgical Handling** of the bowel, **Opioid Analgesics**, and **Hypokalemia**. * **Management:** The first step in managing suspected paralytic ileus is checking the serum electrolyte panel and correcting any deficits, particularly potassium and magnesium. * **Associated Electrolyte:** **Hypomagnesemia** often coexists with hypokalemia and can also contribute to refractory ileus; potassium cannot be effectively corrected until magnesium levels are normalized. * **Radiology:** X-ray typically shows uniform dilatation of both the small and large bowels with gas present in the rectum (unlike mechanical obstruction).

Q: In which of the following conditions is non-hepatic surgery associated with the most adverse outcome?

Child-Pugh score C. **Explanation:** The perioperative risk in patients with liver disease is determined by the severity of hepatic dysfunction and the urgency of the procedure. **Why Child-Pugh Score C is the Correct Answer:** The **Child-Pugh Classification** is the gold standard for predicting surgical mortality in cirrhotic patients. * **Class A:** 10% mortality (Safe for surgery). * **Class B:** 30% mortality (Proceed with caution). * **Class C:** **75-80% mortality.** Due to the extremely high risk of multi-organ failure, encephalopathy, and intractable coagulopathy, elective non-hepatic surgery is generally **contraindicated** in Child-Pugh Class C patients. **Analysis of Incorrect Options:** * **Child-Pugh Score B:** While associated with significant risk, the mortality rate (30%) is substantially lower than Class C. * **Acute Viral Hepatitis:** While surgery should be postponed until liver function tests normalize, the mortality risk is generally lower (approx. 10%) compared to decompensated cirrhosis (Class C). * **Acute Alcoholic Hepatitis:** This carries a very high surgical risk (up to 50% mortality), but statistically, Child-Pugh C remains the most lethal predictor for surgical outcomes in chronic liver disease. **High-Yield Clinical Pearls for NEET-PG:** 1. **MELD Score:** Now frequently used alongside Child-Pugh; a MELD score **>15** is a contraindication for elective surgery. 2. **Most common cause of post-op death** in cirrhotics: Liver failure followed by infection/sepsis. 3. **Contraindications for Elective Surgery:** Child-Pugh C, MELD >15, Acute Hepatitis, ASA Class V, and Severe Coagulopathy (PT >2.5s beyond control). 4. **Best predictor of survival** in patients undergoing portosystemic shunts is the Child-Pugh score.

Q: What is the minimum daily nitrogen requirement for an adult with dynamic tissue turnover to maintain a positive nitrogen balance?

5.5-6.5 g. **Explanation:** The nitrogen balance is a clinical measure of protein metabolism, calculated as the difference between nitrogen intake and nitrogen loss. In a healthy adult with dynamic tissue turnover, the goal is to maintain a **positive nitrogen balance** to support tissue repair and cellular function. **1. Why Option B is Correct:** The standard protein requirement for a healthy adult is approximately **0.8 to 1.0 g/kg/day**. Since protein contains roughly 16% nitrogen, 1 gram of nitrogen is equivalent to 6.25 grams of protein. For an average 70 kg adult, the daily protein requirement is ~70g. Dividing this by 6.25 yields approximately **11-12g of nitrogen** for total replacement. However, the **minimum** requirement to prevent a negative balance and sustain dynamic turnover in a resting state is lower, typically cited in surgical literature as **5.5 to 6.5 g of nitrogen per day**. **2. Analysis of Incorrect Options:** * **Option A (3.5-4.5 g):** This is insufficient for an average adult. Such low intake would lead to a negative nitrogen balance, resulting in muscle wasting and impaired wound healing. * **Options C & D (7.5-10.5 g):** While these values are closer to the "optimal" daily intake for an active individual or a patient in a mild hypermetabolic state, they exceed the "minimum" threshold required to maintain basic balance in a standard adult. **3. High-Yield Clinical Pearls for NEET-PG:** * **Nitrogen-to-Protein Ratio:** 1 g Nitrogen = 6.25 g Protein. * **Calorie-to-Nitrogen Ratio:** In parenteral nutrition, the ideal ratio for a stressed surgical patient is **100:1 to 150:1** (non-protein calories to grams of nitrogen). * **Negative Nitrogen Balance:** Common in burns, sepsis, and major trauma due to excessive catabolism. * **Urine Urea Nitrogen (UUN):** The most common method to measure nitrogen loss clinically.

Question 1

A female patient with steroid-resistant ITP underwent laparoscopic splenectomy. On postoperative day 3, she developed a fever. Which of the following is the most likely cause?

Accepted Answer

Left lower lobe consolidation

Answer

Surgical site infection

Answer

Intra-abdominal collection

Answer

Urine specimen showing pyuria

Question 2

A patient with pyloric stenosis secondary to peptic ulcer complains of profuse vomiting, and has Na+ of 125 meq/L, K+ of 2.3 meq/L, and Cl- of 85 meq/L. Which intravenous fluid should be administered?

Accepted Answer

Normal saline

Answer

Half normal saline

Answer

Potassium bolus

Answer

Hypertonic saline

Question 3

A 65-year-old man diagnosed with adenocarcinoma of the distal esophagus experienced a 25-lb weight loss over the previous 6 months. He underwent a transhiatal esophagectomy complicated by a cervical leak and is receiving enteral feeds through a jejunostomy tube. After one week, his physicians wish to assess his nutritional resuscitation. Which of the following is the most accurate measure of the adequacy of his nutritional support?

Accepted Answer

Serum albumin level

Answer

Urinary nitrogen excretion level

Answer

Total serum protein level

Answer

Serum transferrin level

Question 4

A postoperative cardiac surgery patient developed sudden hypotension, raised Central Venous Pressure (CVP), and pulsus paradoxus at the 4th postoperative hour. What is the most probable diagnosis?

Accepted Answer

Cardiac tamponade

Answer

Excessive mediastinal bleeding

Answer

Ventricular dysfunction

Answer

Congestive cardiac failure

Question 5

What is the most common electrolyte imbalance that causes paralytic ileus?

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypernatremia

Answer

Hyperkalemia

Question 6

After undergoing a left pneumonectomy, a female patient has a chest tube in place for drainage. When caring for this patient, what is an essential nursing intervention?

Accepted Answer

Encourage coughing and deep breathing

Answer

Monitor fluctuations in the water-seal chamber

Answer

Clamp the chest tube once every shift

Answer

Milk the chest tube every 2 hours

Question 7

In which of the following conditions is non-hepatic surgery associated with the most adverse outcome?

Accepted Answer

Child-Pugh score C

Answer

Child-Pugh score B

Answer

Acute viral hepatitis

Answer

Acute alcoholic hepatitis

Question 8

A patient requires total parenteral nutrition for more than a month via a central venous catheter. Which of the following is NOT a standard management practice?

Accepted Answer

Change the central venous catheter tube every two weeks routinely.

Answer

Liver function tests and blood urea nitrogen must be done weekly.

Answer

Electrolytes must be checked every 2-3 days.

Answer

Sudden glucose intolerance is an early sign of sepsis.

Question 9

What is the minimum daily nitrogen requirement for an adult with dynamic tissue turnover to maintain a positive nitrogen balance?

Accepted Answer

5.5-6.5 g

Answer

3.5-4.5 g

Answer

7.5-8.5 g

Answer

9.5-10.5 g

Question 10

A 55-year-old woman undergoes elective cholecystectomy. On postoperative day 6, she has mild abdominal discomfort and bloating. She has received antibiotics, morphine for pain, and metoclopramide for nausea. She has not passed flatus or stools since the surgery. On auscultation, bowel sounds are hypoactive. An abdominal x-ray is ordered. What is the most possible cause for her symptoms?

Accepted Answer

Prolonged postoperative ileus

Answer

Impaction of a gallstone in the ileum

Answer

Adhesions following the surgery

Answer

Absence of bile storage reservoir

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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