Which medications may be used to increase GI motility in patients with increased gastric residual volumes?

Which medications may be used to increase GI motility in patients with increased gastric residual volumes?

• A. Metoclopramide and Erythromycin
• B. Cisapride
• C. Loperamide
• D. Ondansetron

Answer: (A)

When gastric residuals are high, the goal is to speed up gastric emptying with prokinetic agents. Metoclopramide works by blocking dopamine receptors in the gut and increasing acetylcholine release, which strengthens stomach contractions and accelerates gastric emptying. It also has antiemetic effects, helping with nausea that often accompanies delayed emptying. Erythromycin acts as a motilin receptor agonist, stimulating motor activity in the stomach and small intestine and promoting phase III–type contractions that propel contents forward. Together, these meds directly enhance GI motility and reduce residual volumes, improving tolerance to feeding. Cisapride is a prokinetic but carries safety concerns (notably QT prolongation), so it’s not as favorable. Loperamide slows motility, not increases it. Ondansetron is an antiemetic and does not enhance motility.

When gastric residuals are high, the goal is to speed up gastric emptying with prokinetic agents. Metoclopramide works by blocking dopamine receptors in the gut and increasing acetylcholine release, which strengthens stomach contractions and accelerates gastric emptying. It also has antiemetic effects, helping with nausea that often accompanies delayed emptying. Erythromycin acts as a motilin receptor agonist, stimulating motor activity in the stomach and small intestine and promoting phase III–type contractions that propel contents forward. Together, these meds directly enhance GI motility and reduce residual volumes, improving tolerance to feeding.

Cisapride is a prokinetic but carries safety concerns (notably QT prolongation), so it’s not as favorable. Loperamide slows motility, not increases it. Ondansetron is an antiemetic and does not enhance motility.