Bariatric Surgery — MCQs

Q: Which of the following is NOT a component of the Obesity Surgery-Mortality Risk Score (OS-MRS)?

Type-2 Diabetes Mellitus. The **Obesity Surgery-Mortality Risk Score (OS-MRS)** is a validated clinical tool used to predict the risk of 90-day mortality following gastric bypass surgery. It categorizes patients into low (Class A), intermediate (Class B), and high-risk (Class C) groups. ### **Explanation of the Correct Answer** **Type-2 Diabetes Mellitus (Option B)** is the correct answer because it is **not** a component of the OS-MRS. While diabetes is a common comorbidity in bariatric patients and influences long-term metabolic outcomes, it has not been found to be an independent predictor of perioperative mortality in this specific scoring system. ### **Analysis of the OS-MRS Components** The OS-MRS consists of **five** specific clinical variables, each assigned 1 point: 1. **Age ≥ 45 years (Option A):** Older age is associated with decreased physiological reserve. 2. **Hypertension (Option C):** A marker of cardiovascular strain. 3. **Male Gender (Option D):** Men tend to have more android (visceral) fat, making surgery technically more challenging. 4. **BMI ≥ 50 kg/m²:** Extreme obesity increases the risk of surgical complications. 5. **Risk factors for Pulmonary Embolism (PE):** This includes a history of previous DVT/PE, presence of a Vena Cava filter, or signs of pulmonary hypertension/obstructive sleep apnea. ### **High-Yield Clinical Pearls for NEET-PG** * **Risk Stratification:** * **Class A (0-1 point):** Low risk (0.2% mortality) * **Class B (2-3 points):** Intermediate risk (1.1% mortality) * **Class C (4-5 points):** High risk (2.4% mortality) * **Most Common Cause of Death:** Historically, pulmonary embolism was the leading cause of death after bariatric surgery, followed by anastomotic leaks. * **Indications for Surgery:** Remember the updated IFSO/ASMBS 2022 guidelines: BMI ≥35 kg/m² regardless of comorbidities, or BMI 30–34.9 kg/m² with metabolic disease.

Practice by Chapter

Pathophysiology of Obesity

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Patient Selection and Preoperative Evaluation

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Restrictive Procedures

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Malabsorptive Procedures

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Sleeve Gastrectomy

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Roux-en-Y Gastric Bypass

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Biliopancreatic Diversion

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Adjustable Gastric Banding

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Revisional Bariatric Surgery

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Postoperative Management

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Nutritional Considerations

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Metabolic Effects of Bariatric Surgery

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