Gastrointestinal Surgery Practice Questions

Q: Aaron's sign is seen in which of the following conditions?

Acute appendicitis. **Explanation:** **Aaron’s sign** is a clinical sign characterized by referred pain or distress in the epigastrium or precordial region upon continuous firm pressure over **McBurney’s point**. It is a classic physical finding in **Acute Appendicitis**. **Why it occurs:** The underlying mechanism is related to visceral hyperesthesia. When pressure is applied to the inflamed appendix (or the overlying peritoneum), the sensory impulses travel via visceral afferent fibers to the T10 spinal segment. The brain interprets this irritation as pain originating from the epigastrium, which shares similar embryonic dermatomal origins. **Analysis of Incorrect Options:** * **Achalasia Cardia:** Characterized by dysphagia and "bird-beak" appearance on barium swallow; it does not present with abdominal wall signs. * **Hiatus Hernia:** Presents with GERD symptoms or retrosternal pain; signs like **Saint’s Triad** (Hiatus hernia, gallstones, diverticulosis) are more relevant here. * **Mediastinal Emphysema:** Associated with **Hamman’s sign** (a crunching sound heard over the heart during systole), not abdominal signs. **NEET-PG High-Yield Pearls (Appendicitis Signs):** * **Rovsing’s Sign:** Pain in the RIF when the LIF is palpated. * **Psoas Sign:** Pain on extension of the right hip (suggests retrocecal appendix). * **Obturator Sign:** Pain on internal rotation of the flexed right hip (suggests pelvic appendix). * **Blumberg Sign:** Rebound tenderness (indicates peritonitis). * **Ten Horn Sign:** Pain caused by gentle traction on the right spermatic cord.

Q: In which of the following conditions is operative repair favored over conservative management?

Boerhaave's syndrome. **Explanation:** The management of esophageal perforation depends on the mechanism, location, and degree of contamination. **Boerhaave’s syndrome** (post-emetic barogenic rupture) is a surgical emergency because it typically involves a full-thickness longitudinal tear in the distal esophagus, leading to massive contamination of the pleural cavity with gastric contents, enzymes, and bacteria. This results in rapid-onset mediastinitis and sepsis, making **early operative repair** (within 24 hours) the gold standard to prevent high mortality. **Analysis of Options:** * **Perforation of cervical esophagus (B):** These are often small and contained within the neck tissues. If the patient is stable and there is no systemic sepsis, they are frequently managed conservatively with NPO, IV fluids, and antibiotics. * **Esophageal rupture confined to mediastinum (C):** If the perforation is "contained" (demonstrated by contrast remaining within the mediastinum on esophagogram) and the patient is hemodynamically stable without signs of sepsis, conservative management (the Cameron-Mucha criteria) can be attempted. * **Flexible endoscopic perforation (D):** These are "clean" perforations occurring in a fasted patient. If recognized early and the defect is small, they can often be managed conservatively or via endoscopic clipping. **NEET-PG Clinical Pearls:** * **Mackler’s Triad (Boerhaave’s):** Vomiting, chest pain, and subcutaneous emphysema. * **Diagnosis:** Gastrografin swallow is the initial investigation of choice (less irritating than Barium if a leak is present). * **Site:** Most common site for Boerhaave’s is the **left posterolateral aspect** of the distal esophagus (3–5 cm above the diaphragm). * **Time Factor:** Surgery within 24 hours has a significantly better prognosis; beyond 24 hours, primary repair is risky due to friable tissues, often requiring diversion or T-tube drainage.

Q: All of the following are true about carcinoma of the esophagus except?

The incidence of squamous cell carcinoma is increasing.. **Explanation:** The correct answer is **B**, as the statement is false. While Squamous Cell Carcinoma (SCC) remains the most common type of esophageal cancer globally, its **incidence is actually decreasing** in Western countries and urban populations due to better nutrition and reduced smoking. Conversely, the incidence of **Adenocarcinoma is rapidly increasing**, primarily due to the rising prevalence of obesity, GERD, and Barrett’s esophagus. **Analysis of Options:** * **Option A:** Globally, SCC accounts for approximately 90% of esophageal cancer cases, making it the most common histological type overall. * **Option C:** SCC typically arises from the squamous lining of the **upper and middle thirds** of the esophagus. It is strongly associated with alcohol consumption, smoking, and dietary deficiencies. * **Option D:** Adenocarcinoma almost exclusively occurs in the **lower third** of the esophagus, arising from intestinal metaplasia (Barrett’s esophagus) in the setting of chronic acid reflux. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site (Global):** Middle third (SCC). * **Most common site (Increasing trend in West):** Lower third (Adenocarcinoma). * **Risk Factors for SCC:** Tylosis (100% risk), Achalasia cardia, Plummer-Vinson syndrome, and corrosive strictures. * **Investigation of Choice:** Upper GI Endoscopy with biopsy. * **Staging:** Endoscopic Ultrasound (EUS) is the most accurate for 'T' and 'N' staging; PET-CT is best for distant metastasis. * **Lymphatic Spread:** The esophagus lacks a serosa, leading to early mediastinal spread.

Q: Paradoxical aciduria is seen in:

Pyloric obstruction. **Explanation:** **Paradoxical Aciduria** is a classic metabolic derangement seen in **Infantile Hypertrophic Pyloric Stenosis (IHPS)** or adult gastric outlet obstruction. **Pathophysiology:** 1. **Initial Insult:** Persistent vomiting leads to loss of HCl, resulting in **Hypochloremic Hypokalemic Metabolic Alkalosis**. 2. **Renal Compensation:** Initially, the kidney tries to excrete excess bicarbonate ($HCO_3^-$). To maintain electrical neutrality, it excretes Sodium ($Na^+$) along with it. 3. **Dehydration:** As vomiting continues, the body becomes volume-depleted. The Renin-Angiotensin-Aldosterone System (RAAS) is activated to conserve $Na^+$. 4. **The "Paradox":** In the distal tubule, the kidney must reabsorb $Na^+$. Normally, it exchanges $Na^+$ for $K^+$. However, due to chronic vomiting, the body is already **hypokalemic**. To save the remaining $K^+$, the kidney is forced to exchange $Na^+$ for Hydrogen ions ($H^+$) instead. 5. **Result:** Despite the systemic state being alkalotic, the urine becomes acidic. **Analysis of Incorrect Options:** * **A & D (Intestinal/Enterocutaneous Fistula):** These typically result in the loss of alkaline succus entericus (bicarbonate-rich fluid), leading to **Metabolic Acidosis**, not alkalosis. * **B (Vesico-vaginal fistula):** This is a structural communication between the bladder and vagina causing urinary incontinence; it does not cause systemic electrolyte or acid-base disturbances. **High-Yield Clinical Pearls for NEET-PG:** * **The "Vicious Cycle":** Paradoxical aciduria signifies severe, late-stage dehydration and electrolyte depletion. * **Treatment Priority:** Never rush to surgery. Correct dehydration with **0.9% Normal Saline** (to provide $Cl^-$) and add **Potassium** once urine output is established. * **Key Electrolyte Finding:** Low $Cl^-$, Low $K^+$, High $pH$ (Systemic), Low $pH$ (Urine).

Q: A patient recently underwent an endoscopic procedure, following which esophageal perforation occurred. What is the most common site of esophageal perforation in this scenario?

Cervical region. **Explanation:** The most common cause of esophageal perforation is **iatrogenic injury** (instrumentation), accounting for nearly 60-70% of cases. During endoscopic procedures, the most common site of perforation is the **Cervical Esophagus (Option A)**, specifically at the level of the **Cricopharyngeus muscle** (the narrowest part of the esophagus). This area, known as **Killian’s Dehiscence**, is a site of potential weakness between the thyropharyngeus and cricopharyngeus muscles, making it highly susceptible to injury during the initial insertion of the endoscope. **Analysis of Incorrect Options:** * **Option B (Cardiac region):** While the gastroesophageal junction is a site of pathology (like achalasia), it is not the most common site for iatrogenic trauma. * **Option C (Mid esophagus):** Perforations here are usually due to foreign bodies or malignancy, rather than routine endoscopic insertion. * **Option D (Lower esophagus):** This is the most common site for **spontaneous perforation (Boerhaave Syndrome)**, typically occurring in the left posterolateral aspect, 2-3 cm above the diaphragm. It is less common in iatrogenic cases unless a specific intervention (like balloon dilation) is performed. **NEET-PG High-Yield Pearls:** * **Most common site (Overall/Iatrogenic):** Cervical esophagus (Cricopharyngeus). * **Most common site (Spontaneous/Boerhaave):** Distal 1/3rd (Lower esophagus). * **Diagnosis:** Gastrografin swallow is the initial investigation of choice (water-soluble contrast); CT scan is the most sensitive for detecting extraluminal air. * **Mackler’s Triad (Boerhaave):** Vomiting, chest pain, and subcutaneous emphysema.

Q: Which of the following is NOT a cause of non-healing of an enterocutaneous fistula?

Track length greater than 3 cm. To understand why an enterocutaneous fistula (ECF) fails to heal spontaneously, we use the classic mnemonic **FRIEND**. This acronym lists the factors that prevent closure: **F**oreign body, **R**adiation, **I**nfection/Inflammation, **E**pithelialization, **N**eoplasia, and **D**istal obstruction. ### Explanation of the Correct Answer **B. Track length greater than 3 cm:** This is the correct answer because a **long track (>2 cm)** actually **favors** spontaneous healing. Conversely, a short track (<2 cm) is a risk factor for non-healing because it allows the intestinal mucosa to easily reach the skin surface, leading to epithelialization. ### Why the Other Options are Wrong * **A. Epithelialization of the track:** Once the fistula track is lined with epithelium (mucocutaneous continuity), it behaves like a stoma. It will never close spontaneously and requires surgical intervention. * **C. Acute inflammatory disease:** Active inflammation (e.g., Crohn’s disease or local abscess) prevents the deposition of collagen and the contraction of the track, leading to persistence. * **D. Radiation enteritis:** Radiation causes endarteritis obliterans and chronic ischemia of the bowel wall. Poor blood supply significantly impairs the tissue's ability to heal. ### NEET-PG High-Yield Pearls * **FRIEND Mnemonic:** **F**oreign body, **R**adiation, **I**nfection/IBD, **E**pithelialization, **N**eoplasia, **D**istal obstruction. * **Anatomical Factors for Non-healing:** Short track ( 500 ml/day), large defect (>1 cm), and lateral duodenal or gastric fistulae. * **Electrolyte Imbalance:** High-output fistulae most commonly lead to **hypokalemic metabolic acidosis** (due to loss of bicarbonate and potassium). * **Management Priority:** The first step in management is always **stabilization** (fluid resuscitation and skin protection), not immediate surgery.

Question 1

Aaron's sign is seen in which of the following conditions?

Accepted Answer

Acute appendicitis

Answer

Achalasia cardia

Answer

Hiatus hernia

Answer

Mediastinum emphysema

Question 2

Which of the following conditions are associated with an increased risk of post-splenectomy sepsis?

Accepted Answer

Thalassemia

Answer

Idiopathic thrombocytopenic purpura (ITP)

Answer

Hereditary spherocytosis

Answer

Trauma

Question 3

In which of the following conditions is operative repair favored over conservative management?

Accepted Answer

Boerhaave's syndrome

Answer

Perforation of cervical esophagus

Answer

Esophageal rupture confined to mediastinum

Answer

Flexible endoscopic perforation of esophagus

Question 4

In a patient, excision rather than bypass is preferred for surgical treatment of small intestinal Crohn's disease because why?

Accepted Answer

The risk of small intestine cancer is reduced.

Answer

Excision is safer.

Answer

Bypass does not relieve symptoms.

Answer

Excision cures the patient of Crohn's disease, whereas bypass does not.

Question 5

All of the following are true about carcinoma of the esophagus except?

Accepted Answer

The incidence of squamous cell carcinoma is increasing.

Answer

Squamous cell carcinoma is the most common type of esophageal cancer.

Answer

Squamous cell carcinoma is more common in the upper two-thirds of the esophagus.

Answer

Adenocarcinoma is common in the lower third of the esophagus.

Question 6

Which of the following are components of the management of a perforated peptic ulcer?

Accepted Answer

Intravenous fluids, Immediate surgery, Intravenous pantoprazole

Answer

Intravenous fluids, Antacids, Intravenous pantoprazole

Answer

Drainage of paracolic gutter, Antacids, Intravenous pantoprazole

Answer

Intravenous fluids, Antacids, Drainage of paracolic gutter

Question 7

Paradoxical aciduria is seen in:

Accepted Answer

Pyloric obstruction

Answer

Intestinal obstruction

Answer

Vesico-vaginal fistula

Answer

Enterocutaneous fistula

Question 8

A patient recently underwent an endoscopic procedure, following which esophageal perforation occurred. What is the most common site of esophageal perforation in this scenario?

Accepted Answer

Cervical region

Answer

Cardiac region

Answer

Mid esophagus

Answer

Lower esophagus

Question 9

A previously healthy 55-year-old man undergoes elective right hemicolectomy for a stage I (T2N0M0) cancer of the cecum. His postoperative ileus is somewhat prolonged, and on the fifth postoperative day his nasogastric tube is still in place. Physical examination reveals diminished skin turgor, dry mucous membranes, and orthostatic hypotension. Pertinent laboratory values are as follows: Arterial blood gases: pH 7.56, PCO2 50 mm Hg, PO2 85 mm Hg. Serum electrolytes (mEq/L): Na+ 132, K+ 3.1, Cl- 80; HCO3- 42. Urine electrolytes (mEq/L): Na+ 2, K+ 5, Cl- 6. What is the patient's acid-base abnormality?

Accepted Answer

Metabolic alkalosis with respiratory compensation

Answer

Uncompensated metabolic alkalosis

Answer

Respiratory acidosis with metabolic compensation

Answer

Combined metabolic and respiratory alkalosis

Question 10

Which of the following is NOT a cause of non-healing of an enterocutaneous fistula?

Accepted Answer

Track length greater than 3 cm

Answer

Epithelialization of the track

Answer

Acute inflammatory disease

Answer

Radiation enteritis

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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