A 58-year-old man with type 2 diabetes mellitus is scheduled for emergency appendicectomy. He consumed a heavy meal (chicken biryani with ghee) at 18:00 hours the previous evening. He presents to the hospital at 06:00 AM the next morning. His blood glucose is 280 mg/dL. What is the most appropriate fasting assessment and recommendation regarding his readiness for anesthesia?

Explanation

## Fasting in High-Risk Patients: Diabetes and Delayed Gastric Emptying **Key Point:** Although the patient has fasted for 12 hours (exceeding the standard 8-hour requirement for a heavy meal), **delayed gastric emptying in hyperglycemia significantly increases aspiration risk** and mandates additional precautions. ### Factors Affecting Gastric Emptying in Diabetic Patients | Factor | Effect on Gastric Emptying | |---|---| | Hyperglycemia (>200 mg/dL) | Delayed (impaired antral contractions) | | Diabetic neuropathy | Delayed | | Autonomic dysfunction | Delayed | | Acute illness/stress | Delayed | | Heavy/fatty meal | Delayed | **High-Yield:** In diabetic patients with **acute hyperglycemia (>200 mg/dL)**, gastric emptying is significantly prolonged regardless of the fasting duration. A blood glucose of 280 mg/dL in this patient is a red flag for impaired gastric motility. ### Management Strategy for High-Risk Fasting 1. **Nasogastric (NG) tube placement** — Consider preoperative NG aspiration to empty residual gastric contents, especially if the patient is symptomatic or has signs of gastric distension 2. **Acid aspiration prophylaxis** — Administer: - H₂-receptor antagonist (e.g., ranitidine 50 mg IV) OR - Proton pump inhibitor (e.g., omeprazole 40 mg IV) 3. **Rapid sequence intubation (RSI)** — Use cricoid pressure and succinylcholine to minimize aspiration risk during induction 4. **Blood glucose optimization** — Initiate insulin therapy to reduce hyperglycemia and improve gastric motility **Clinical Pearl:** The combination of a heavy meal, prolonged fasting duration, and acute hyperglycemia creates a paradoxical situation: while the fasting time appears adequate, the gastric contents may still be present due to impaired emptying. This is a classic trap in preoperative assessment. **Warning:** Do not assume that fasting duration alone is sufficient in diabetic patients with hyperglycemia. The **quality of fasting** (i.e., whether the stomach is actually empty) is more important than the **quantity of time** fasted. ### Why This Patient Remains at High Aspiration Risk - Blood glucose 280 mg/dL → delayed gastric emptying - Heavy meal (biryani with ghee) → intrinsically slow to empty - Emergency surgery → stress-induced delayed gastric emptying - Possible diabetic autonomic neuropathy → impaired gastric motility