Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 1171: Which is the most common site for iatrogenic esophageal perforation?

A. Abdominal perforation (Correct Answer)
B. Cervical perforation
C. Above arch of aorta
D. Below arch of aorta

Explanation: ***Abdominal perforation*** - The **distal esophagus** near the **gastroesophageal (GE) junction** is the most common site for iatrogenic perforation, accounting for the majority of cases. - Most perforations occur during **pneumatic or bougie dilation** for achalasia, strictures, or during **endoscopic procedures** at the GE junction. - This area is vulnerable due to its **thin wall**, lack of serosal covering, and frequent instrumentation during therapeutic procedures. - The distal esophagus is subjected to more forceful interventions (dilations, stent placements) compared to other segments. *Cervical perforation* - While cervical perforations do occur (often during passage through the **cricopharyngeus muscle** or **upper esophageal sphincter**), they are **less common** than distal esophageal perforations. - The cervical esophagus is more accessible and procedures here tend to be less aggressive than distal therapeutic interventions. - Cervical perforations have a better prognosis due to **easier drainage** into the neck rather than mediastinum. *Above arch of aorta* - This segment of the mid-thoracic esophagus at the level of the **aortic arch** represents a point of anatomic narrowing. - Perforations here are less common than at the GE junction but can occur during difficult intubations or foreign body removal. *Below arch of aorta* - The **lower thoracic esophagus** below the aortic arch but above the GE junction is relatively less commonly perforated. - While this area can be injured, the highest risk zone remains the **distal-most esophagus** at the GE junction where most therapeutic procedures are performed.

Question 1172: In the context of surgical procedures, gastrojejunostomy is classified as which type of wound?

A. Clean contaminated wound (Correct Answer)
B. Dirty/Infected wound
C. Clean wound
D. Contaminated wound

Explanation: ***Clean contaminated wound*** - A **clean contaminated wound** involves entry into body cavities that contain normal flora, such as the gastrointestinal (GI) tract. - While there is **controlled entry into a hollow viscus** (stomach and jejunum in this case), there is no unusual contamination, making it a clean contaminated wound. *Clean wound* - A **clean wound** does not involve entry into a hollow viscus or body cavity containing normal flora; it primarily involves only skin or muscle. - Procedures like a hernia repair without bowel resection or a thyroidectomy are examples of clean wounds. *Dirty/Infected wound* - A **dirty/infected wound** is characterized by the presence of frank pus, tissue necrosis, or a perforated viscus, indicating existing infection. - A gastrojejunostomy is not typically performed in the presence of an active, established infection within the surgical field unless there are specific complications. *Contaminated wound* - A **contaminated wound** involves gross spillage from the GI tract (e.g., colonic injury), major breaks in sterile technique, or severe inflammation without pus. - While gastrojejunostomy involves the GI tract, it is generally performed with controlled entry and without significant spillage or existing macroscopic infection.

Question 1173: What is the investigation of choice in peptic ulcer perforation?

A. X-Ray abdomen (Correct Answer)
B. Paracentesis
C. CT scan
D. USG

Explanation: ***X-Ray abdomen*** - An **X-ray of the abdomen in erect position** (or an **erect chest X-ray**) is the initial and often diagnostic investigation for a perforated peptic ulcer due to the presence of **free air under the diaphragm**. - The visualization of **subdiaphragmatic free air** (pneumoperitoneum) indicates a breach in the gastrointestinal tract. - **Erect positioning** is essential as it allows gas to rise and accumulate under the diaphragm, making it visible on the radiograph. *USG* - **Ultrasound (USG)** can sometimes detect free fluid or signs of perforation, but it is less sensitive and specific for detecting free air when compared to a plain X-ray. - Its utility is more in detecting **intra-abdominal fluid collections** or assessing solid organs, rather than pneumoperitoneum. *Paracentesis* - **Paracentesis** involves aspirating fluid from the peritoneal cavity for analysis and is primarily used to diagnose **ascites** or **spontaneous bacterial peritonitis**. - It is not the initial diagnostic test for peptic ulcer perforation, nor does it directly visualize free air. *CT scan* - A **CT scan** is highly sensitive and can detect even small amounts of **free air** or fluid, making it the most definitive imaging study for perforation. - However, it is typically performed if the diagnosis is ambiguous after a plain X-ray or when surgical planning requires more detailed anatomical information, not as the first-line investigation due to higher cost and radiation exposure.

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