A 58-year-old man with type 2 diabetes mellitus is scheduled for emergency appendicectomy. He consumed a light breakfast 3 hours ago. Regarding pre-operative fasting and aspiration risk reduction, all of the following are appropriate measures EXCEPT:

Question

Accepted Answer

D. Delay surgery by 6 hours to allow complete gastric emptying before proceeding with anesthesia. ## Aspiration Risk Reduction in Emergency Surgery

**Key Point:** When emergency surgery cannot be delayed for adequate fasting, pharmacological and airway management strategies are used to reduce aspiration risk. However, delaying emergency surgery by 6 hours to achieve fasting is **not appropriate** — emergency cases proceed with aspiration precautions regardless of fasting status.

### Appropriate Aspiration Prophylaxis Measures

| Intervention | Mechanism | Timing | Evidence |
|---|---|---|---|
| Sodium citrate 30 mL (0.3 M) | Raises gastric pH > 2.5 (neutralizes acid) | 15–20 min before induction | Standard prophylaxis |
| Metoclopramide 10 mg IV | Enhances gastric motility & emptying | 30 min before induction | Reduces gastric volume |
| H₂ blockers (ranitidine) | Reduces gastric acid secretion | 60–90 min before induction | Adjunct to sodium citrate |
| Rapid sequence intubation (RSI) | Minimizes time with unprotected airway | At induction | Gold standard for high-risk patients |
| Cricoid pressure (Sellick maneuver) | Occludes esophageal lumen; prevents regurgitation | During RSI | Reduces aspiration incidence |

**High-Yield:** In **emergency surgery**, the principle is: **do not delay for fasting**. Instead, apply aspiration precautions (RSI, cricoid pressure, antacids, prokinetics). Delaying a surgical emergency by 6 hours to achieve fasting is clinically inappropriate and may worsen the patient's condition.

**Clinical Pearl:** The diabetic patient has additional aspiration risk due to gastroparesis (delayed gastric emptying from autonomic neuropathy). Metoclopramide is especially valuable in this population.

**Mnemonic:** **RSI-ACE** for emergency aspiration prophylaxis:
- **R**apid Sequence Intubation
- **S**odium citrate
- **I**V access secured
- **A**ntacids (H₂ blockers)
- **C**ricoid pressure
- **E**mergency airway equipment ready

**Warning:** Do not confuse emergency and elective surgery fasting rules. In elective cases, delay surgery if fasting is inadequate. In emergency cases, proceed with aspiration precautions — do not delay.

Answer

A. Administer metoclopramide 10 mg IV 30 minutes before induction to enhance gastric emptying

Answer

B. Perform rapid sequence intubation with cricoid pressure as the patient is at high risk of aspiration

Answer

C. Administer sodium citrate 30 mL (0.3 M) orally 15–20 minutes before induction to raise gastric pH above 2.5

A 58-year-old man with type 2 diabetes mellitus is scheduled for emergency appendicectomy. He consumed a light breakfast 3 hours ago. Regarding pre-operative fasting and aspiration risk reduction, all of the following are appropriate measures EXCEPT:

Explanation

Aspiration Risk Reduction in Emergency Surgery

Appropriate Aspiration Prophylaxis Measures

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Intervention	Mechanism	Timing	Evidence
Sodium citrate 30 mL (0.3 M)	Raises gastric pH > 2.5 (neutralizes acid)	15–20 min before induction	Standard prophylaxis
Metoclopramide 10 mg IV	Enhances gastric motility & emptying	30 min before induction	Reduces gastric volume
H₂ blockers (ranitidine)	Reduces gastric acid secretion	60–90 min before induction	Adjunct to sodium citrate
Rapid sequence intubation (RSI)	Minimizes time with unprotected airway	At induction	Gold standard for high-risk patients
Cricoid pressure (Sellick maneuver)	Occludes esophageal lumen; prevents regurgitation	During RSI	Reduces aspiration incidence