Preoperative and Postoperative Care — MCQs

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?

Q60Medium

Which of the following intravenous fluids should not be administered in the first 24 hours after surgery?

Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 51: 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?

A. Left lower lobe consolidation (Correct Answer)
B. Surgical site infection
C. Intra-abdominal collection
D. Urine specimen showing pyuria

Explanation: **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*.

Question 52: What is the commonest symptom observed post-operatively?

A. Depression
B. Psychosis
C. Euphoria
D. None of the above (Correct Answer)

Explanation: ### Explanation The correct answer is **None of the above** because the most common psychological symptom observed post-operatively is **Anxiety**, followed closely by **Insomnia**. #### 1. Why "None of the above" is correct: Post-operative psychological disturbances are common due to surgical stress, pain, and the effects of anesthesia. However, the most frequent manifestation is **anxiety** (related to recovery, pain, or prognosis). If the question refers to the most common *physical* symptom, the answer would be **Pain** or **Nausea/Vomiting**. Since none of the provided options (Depression, Psychosis, Euphoria) represent the most frequent post-operative state, "None of the above" is the most accurate choice. #### 2. Analysis of Incorrect Options: * **A. Depression:** While post-operative depression can occur (especially after major life-altering surgeries like amputations or stoma formation), it is not the most common symptom. It usually manifests later in the recovery phase rather than the immediate post-operative period. * **B. Psychosis:** Post-operative psychosis (or delirium) is a significant complication, particularly in the elderly (Post-operative Cognitive Dysfunction - POCD), but it is a pathological state rather than a common symptom. It is often triggered by hypoxia, electrolyte imbalances, or medications. * **C. Euphoria:** This is rarely seen post-operatively. While it may occur briefly during emergence from certain anesthetic agents (like Ketamine or Nitrous Oxide), it is not a standard post-operative symptom. #### 3. NEET-PG High-Yield Pearls: * **Most common post-operative symptom (General):** Pain. * **Most common post-operative psychological symptom:** Anxiety. * **Post-operative Delirium:** Most common in elderly patients; "Lucid intervals" are characteristic. Always rule out hypoxia and hypoglycemia first. * **Post-operative Shivering:** Most commonly due to hypothermia; treated with **Pethidine** (Meperidine). * **Day 1 Post-op Fever:** Usually due to **Atelectasis** (most common cause of fever in the first 24-48 hours).

Question 53: 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?

A. Half normal saline
B. Normal saline (Correct Answer)
C. Potassium bolus
D. Hypertonic saline

Explanation: ### Explanation The clinical presentation of profuse vomiting due to gastric outlet obstruction (pyloric stenosis) leads to a classic metabolic derangement: **Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria.** **1. Why Normal Saline (0.9% NaCl) is the Correct Choice:** The primary driver of this metabolic state is the loss of gastric hydrochloric acid (HCl). This results in: * **Volume depletion:** Activating the Renin-Angiotensin-Aldosterone System (RAAS). * **Chloride depletion:** Forcing the kidneys to reabsorb Bicarbonate ($HCO_3^-$) to maintain anionic balance. * **Hypokalemia:** Due to both vomiting and renal exchange for Na+ under aldosterone influence. **Normal Saline** is the fluid of choice because it addresses the two most critical deficits: **Volume and Chloride.** By providing a high concentration of Chloride (154 mEq/L), it allows the kidneys to excrete excess bicarbonate, thereby correcting the alkalosis. Once urine output is established, potassium is added to the saline to correct the hypokalemia. **2. Why Other Options are Incorrect:** * **Half Normal Saline (0.45% NaCl):** Provides insufficient sodium and chloride to rapidly correct the severe contraction alkalosis and volume deficit. * **Potassium Bolus:** Intravenous potassium must *never* be given as a bolus due to the risk of fatal cardiac arrest. It must be diluted and infused slowly after ensuring adequate renal function (urine output). * **Hypertonic Saline (3% NaCl):** Reserved for symptomatic hyponatremia or emergency neurosurgical cases. It does not address the underlying chloride-sensitive alkalosis. **Clinical Pearls for NEET-PG:** * **Paradoxical Aciduria:** In severe dehydration, the kidney prioritizes volume (Na+ reabsorption) over pH. It exchanges H+ for Na+ in the distal tubule, leading to acidic urine despite systemic alkalosis. * **Initial Fluid:** Always start with 0.9% Normal Saline. * **Definitive Treatment:** Surgery (e.g., Gastrojejunostomy or Pyloroplasty) is only performed *after* correcting the electrolyte and acid-base imbalances.

Question 54: 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?

A. Excessive mediastinal bleeding
B. Ventricular dysfunction
C. Congestive cardiac failure
D. Cardiac tamponade (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Cardiac tamponade** The clinical triad of **sudden hypotension**, **raised Central Venous Pressure (CVP)**, and **pulsus paradoxus** in a post-cardiac surgery patient is the classic presentation of **Cardiac Tamponade**. In the postoperative setting, this usually occurs due to the accumulation of blood or clots in the pericardial space. This fluid increases intrapericardial pressure, which restricts diastolic filling of the ventricles. The raised CVP reflects the heart's inability to accept venous return (impaired filling), while the hypotension results from decreased stroke volume. **Pulsus paradoxus** (an exaggerated drop in systolic blood pressure >10 mmHg during inspiration) is a hallmark sign caused by ventricular interdependence within a fixed space. **Why other options are incorrect:** * **A. Excessive mediastinal bleeding:** While bleeding often leads to tamponade, "bleeding" itself typically presents with **low CVP** (hypovolemia) unless the blood is trapped within the pericardium causing compression. * **B. Ventricular dysfunction:** While this causes hypotension and raised CVP, it does not typically cause **pulsus paradoxus**, which is a mechanical restrictive phenomenon. * **C. Congestive cardiac failure (CCF):** CCF presents with raised CVP and pulmonary edema, but it develops more gradually and lacks the specific sign of pulsus paradoxus seen in acute tamponade. **NEET-PG High-Yield Pearls:** * **Beck’s Triad:** Hypotension, Jugular Venous Distension (raised CVP), and Muffled heart sounds (though muffled sounds are often absent in post-surgical tamponade due to localized clots). * **Kussmaul’s Sign:** A paradoxical rise in JVP on inspiration; more common in constrictive pericarditis but can be seen in tamponade. * **Echocardiography:** The gold standard for diagnosis (shows diastolic collapse of the right atrium/ventricle). * **Management:** Immediate surgical re-exploration or pericardiocentesis.

Question 55: What is the most common electrolyte imbalance that causes paralytic ileus?

A. Hyponatremia
B. Hypernatremia
C. Hypokalemia (Correct Answer)
D. Hyperkalemia

Explanation: **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).

Question 56: Complications of hemithyroidectomy include all of the following, except?

A. Hypocalcemia (Correct Answer)
B. Wound hematoma
C. Recurrent laryngeal nerve palsy
D. External branch of superior laryngeal nerve palsy

Explanation: **Explanation:** The correct answer is **Hypocalcemia**. **1. Why Hypocalcemia is the correct answer:** Hypocalcemia occurs due to accidental removal or devascularization of the parathyroid glands. There are four parathyroid glands (two on each side). In a **hemithyroidectomy**, only one lobe of the thyroid is removed, leaving the two contralateral parathyroid glands intact. These remaining glands are sufficient to maintain normal calcium homeostasis. Therefore, clinically significant hypocalcemia is a complication of total or subtotal thyroidectomy, but not hemithyroidectomy. **2. Analysis of incorrect options:** * **Wound Hematoma:** This is a potential complication of *any* neck surgery. A tension hematoma can cause life-threatening airway obstruction and requires immediate bedside evacuation. * **Recurrent Laryngeal Nerve (RLN) Palsy:** The RLN runs in the tracheoesophageal groove on both sides. Even in a unilateral procedure, the nerve on the operative side is at risk during dissection, leading to hoarseness of voice. * **External Branch of Superior Laryngeal Nerve (EBSLN) Palsy:** This nerve lies close to the superior thyroid artery. Damage during ligation of the superior pole vessels (on the operative side) results in loss of high-pitched voice and vocal fatigue. **NEET-PG High-Yield Pearls:** * **Most common cause of hypocalcemia post-thyroidectomy:** Accidental injury to parathyroid glands or their blood supply (Inferior Thyroid Artery). * **Chvostek’s and Trousseau’s signs:** Clinical indicators of latent tetany due to hypocalcemia. * **Nerve most commonly injured:** EBSLN (due to its proximity to the superior thyroid artery). * **Nerve injury causing "Bovine Cough":** Unilateral RLN palsy. * **Emergency Management:** For post-op respiratory distress due to hematoma, the first step is to **open the wound sutures at the bedside** to relieve pressure.

Question 57: 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?

A. Change the central venous catheter tube every two weeks routinely. (Correct Answer)
B. Liver function tests and blood urea nitrogen must be done weekly.
C. Electrolytes must be checked every 2-3 days.
D. Sudden glucose intolerance is an early sign of sepsis.

Explanation: ### Explanation **1. Why Option A is the Correct Answer (The "NOT" practice):** Routine replacement of central venous catheters (CVCs) at fixed intervals is **not recommended**. Evidence shows that scheduled changes do not reduce the incidence of Catheter-Related Bloodstream Infections (CRBSI) and may actually increase the risk of mechanical complications (like pneumothorax or arterial puncture) during re-insertion. A CVC should only be replaced if there is a clinical suspicion of infection, catheter malfunction, or if the site is compromised. **2. Analysis of Incorrect Options (Standard Practices):** * **Option B (LFTs and BUN):** Long-term TPN can cause hepatobiliary complications (e.g., steatosis, cholestasis). Weekly monitoring of LFTs and BUN is essential to detect TPN-induced liver dysfunction and monitor protein metabolism/renal clearance. * **Option C (Electrolytes):** During the maintenance phase of TPN, electrolytes (Sodium, Potassium, Calcium, Magnesium, Phosphorus) must be checked 2–3 times a week to prevent imbalances, especially Refeeding Syndrome. * **Option D (Glucose Intolerance):** This is a high-yield clinical sign. A sudden, unexplained increase in blood glucose levels in a previously stable TPN patient is often the **earliest metabolic indicator of occult sepsis**, occurring even before fever or leukocytosis. **3. Clinical Pearls for NEET-PG:** * **Preferred Site:** The **Subclavian vein** is preferred over the Internal Jugular or Femoral vein for long-term TPN due to a lower risk of infection and better patient comfort. * **Gold Standard for Diagnosis:** The most accurate way to diagnose CRBSI is a **semi-quantitative culture** of the catheter tip (Maki’s roll-plate technique) showing >15 CFU. * **Refeeding Syndrome:** Characterized by profound **Hypophosphatemia**, Hypomagnesemia, and Hypokalemia upon initiating TPN in malnourished patients.

Question 58: On the 7th postoperative day after laparoscopic cholecystectomy, a patient developed upper abdominal pain and a 10 cm x 8 cm collection. What is the recommended initial treatment?

A. Immediate laparotomy
B. Percutaneous drainage (Correct Answer)
C. Laparotomy and surgical exploration of the bile duct with T-tube insertion
D. All of the above

Explanation: ### Explanation The patient presents with a localized fluid collection (likely a biloma or hematoma) on the 7th postoperative day following a laparoscopic cholecystectomy. In a hemodynamically stable patient with a localized collection, the management follows the principle of **"Step-up Approach."** **1. Why Percutaneous Drainage (Option B) is Correct:** Percutaneous drainage (usually ultrasound or CT-guided) is the **initial treatment of choice**. It serves two purposes: * **Therapeutic:** It decompresses the collection, relieves pain, and prevents sepsis. * **Diagnostic:** Analysis of the fluid (bilirubin levels, culture) helps differentiate between a biloma, seroma, or abscess. Once the collection is drained and the patient is stabilized, further imaging like **MRCP or ERCP** is performed to identify the source (e.g., a cystic duct leak or a minor bile duct injury). **2. Why Other Options are Incorrect:** * **Option A & C (Laparotomy/Surgical Exploration):** Immediate surgery is contraindicated in a stable patient with a localized collection. Early re-operation in an inflamed, "friable" abdomen increases the risk of further biliary injury and morbidity. Surgery is reserved for patients with generalized peritonitis or those who fail minimally invasive management. * **Option D:** Since surgical options are not the first-line treatment, "All of the above" is incorrect. **Clinical Pearls for NEET-PG:** * **Most common cause of post-cholecystectomy biloma:** Leak from the **Cystic duct stump** or the **Duct of Luschka**. * **Gold standard for diagnosing the site of bile leak:** ERCP (which is also therapeutic as stenting lowers intraductal pressure, allowing the leak to heal). * **Timing:** Post-laparoscopic bile duct injuries typically present between day 3 and day 7. * **Initial Investigation of choice:** Ultrasound (to detect collection); **Most accurate investigation:** MRCP/ERCP.

Question 59: 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?

A. Impaction of a gallstone in the ileum
B. Adhesions following the surgery
C. Prolonged postoperative ileus (Correct Answer)
D. Absence of bile storage reservoir

Explanation: ### Explanation **Correct Option: C. Prolonged postoperative ileus** Postoperative ileus (POI) is a transient impairment of gastrointestinal motility after surgery. While "physiologic" ileus typically resolves within 3 days (24h for small bowel, 48h for stomach, 72h for colon), **prolonged POI** is defined as ileus lasting 5–7 days or more. In this patient, the diagnosis is supported by: 1. **Timeline:** Symptoms persisting to Postoperative Day (POD) 6. 2. **Clinical Features:** Bloating, lack of flatus/stools, and hypoactive bowel sounds (suggesting an adynamic state rather than mechanical obstruction). 3. **Exacerbating Factors:** The use of **Morphine** (opioids significantly inhibit gut motility) is a classic trigger for prolonged ileus. --- ### Why the other options are incorrect: * **A. Impaction of a gallstone (Gallstone Ileus):** This typically occurs due to a cholecystenteric fistula (usually between the gallbladder and duodenum), not as a routine complication of elective cholecystectomy. It presents with mechanical obstruction (hyperactive sounds initially, then "tinkling"). * **B. Adhesions:** While adhesions are the #1 cause of mechanical Small Bowel Obstruction (SBO), they usually present with colicky pain and **hyperactive/high-pitched** bowel sounds. POD 6 is also quite early for dense adhesions to cause complete obstruction. * **D. Absence of bile storage reservoir:** The absence of the gallbladder (post-cholecystectomy state) may cause mild diarrhea or dyspepsia in some patients, but it does not cause an adynamic ileus or cessation of flatus. --- ### NEET-PG High-Yield Pearls: * **Order of Motility Return:** Small Intestine (0–24h) → Stomach (24–48h) → Colon (48–72h). * **Most common cause of POI:** Surgical manipulation and activation of inhibitory neural reflexes. * **Electrolyte Imbalance:** Hypokalemia is a major metabolic contributor to ileus. * **Management:** "Drip and Suck" (IV fluids and Nasogastric decompression), correction of electrolytes, and minimizing opioids (using NSAIDs/Epidurals instead). * **Alvimopan:** A peripherally acting mu-opioid receptor antagonist used specifically to accelerate recovery of bowel function.

Question 60: Which of the following intravenous fluids should not be administered in the first 24 hours after surgery?

A. 5% dextrose
B. 0.9% NaCl solution (Correct Answer)
C. Lactated Ringer's solution
D. Darrow's solution

Explanation: The correct answer is **0.9% NaCl solution**. ### **Explanation** The primary reason for avoiding 0.9% Normal Saline (NS) in the immediate postoperative period (first 24 hours) is the **surgical stress response**. Surgery triggers the release of ADH (Antidiuretic Hormone) and Aldosterone, leading to the retention of water and sodium by the kidneys. 1. **Hyperchloremic Acidosis:** 0.9% NaCl contains supra-physiological levels of Chloride (154 mEq/L). Large volumes can lead to hyperchloremic metabolic acidosis, which impairs renal perfusion and gastrointestinal motility. 2. **Sodium Overload:** Since the body is already conserving sodium post-surgery, administering isotonic saline increases the risk of interstitial edema, pulmonary congestion, and delayed wound healing. ### **Analysis of Other Options** * **5% Dextrose (A):** Often used as part of maintenance fluid (e.g., Dextrose-Saline) to provide calories and prevent ketosis. However, pure 5% Dextrose is rarely used alone as it becomes free water once glucose is metabolized. * **Lactated Ringer’s (C):** This is the **fluid of choice** for perioperative replacement. It is "balanced," containing electrolyte concentrations closer to plasma and a buffer (lactate) that prevents acidosis. * **Darrow’s Solution (D):** A balanced salt solution containing Potassium and Lactate, historically used to treat dehydration with potassium loss. While less common now, it does not carry the high chloride risk of 0.9% NS. ### **NEET-PG High-Yield Pearls** * **Standard Post-op Fluid:** Balanced Salt Solutions (like Ringer’s Lactate or Hartmann's) are preferred over Normal Saline. * **The "Chloride" Rule:** High chloride intake (from NS) causes renal afferent arteriolar vasoconstriction, reducing GFR. * **Potassium Caution:** Potassium is generally avoided in the first 24 hours post-op unless there is a documented deficit, due to the release of intracellular potassium from surgical tissue trauma.

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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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