Minimally Invasive Surgery — MCQs

Q: Laparoscopy is best avoided in patients with:

COPD. **Explanation:** The correct answer is **COPD (Chronic Obstructive Pulmonary Disease)**. **1. Why COPD is the correct answer:** Laparoscopy requires the creation of a **pneumoperitoneum**, typically using Carbon Dioxide ($CO_2$). The physiological consequences of this procedure are particularly hazardous for COPD patients: * **Hypercapnia:** $CO_2$ is absorbed across the peritoneum into the bloodstream. Patients with COPD already have impaired gas exchange and may be "CO2 retainers." They cannot effectively compensate by increasing minute ventilation, leading to respiratory acidosis. * **Reduced Compliance:** The pressure of the pneumoperitoneum pushes the diaphragm cranially, reducing functional residual capacity (FRC) and increasing peak airway pressures. This can further compromise ventilation-perfusion ($V/Q$) matching in diseased lungs. **2. Why the other options are incorrect:** * **Hypertension & Diabetes:** These are common comorbidities and are **not contraindications**. In fact, the minimally invasive nature of laparoscopy (less pain, faster mobilization) often benefits these patients by reducing the surgical stress response and wound complications. * **Obesity:** Obesity was once considered a relative contraindication, but it is now a **strong indication** for laparoscopy. It significantly reduces the risk of wound dehiscence, infections, and incisional hernias, which are common in obese patients undergoing open surgery. **Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Uncorrected coagulopathy, increased intracranial pressure (ICP), and severe hemodynamic instability (e.g., septic or hypovolemic shock). * **Cardiac Effect:** Pneumoperitoneum decreases venous return (preload) and increases systemic vascular resistance (afterload), which can decrease cardiac output. * **Gas of Choice:** $CO_2$ is used because it is non-combustible, highly soluble in blood (reducing air embolism risk), and inexpensive.

Practice by Chapter

Laparoscopic Equipment and Instrumentation

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Physiological Changes in Laparoscopy

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Laparoscopic Access Techniques

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Laparoscopic Cholecystectomy

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Laparoscopic Appendectomy

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Laparoscopic Hernia Repair

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Laparoscopic Colorectal Surgery

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Laparoscopic Upper GI Surgery

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Robotic Surgery

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Single Incision Laparoscopic Surgery

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NOTES (Natural Orifice Transluminal Endoscopic Surgery)

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Complications of Minimally Invasive Surgery

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