Erythromycin dose of 70 mg accelerates gastric emptying as effectively as 200 mg in the critically ill

To compare the effectiveness of 70-mg and 200-mg doses of intravenous erythromycin in improving gastric emptying in critically ill patients. Gastric emptying was measured on consecutive days; day 1 (pre-treatment), day 2 (post-treatment) after an intravenous infusion of either 70 or 200 mg erythromycin or saline placebo (0.9%), in a randomized double-blind fashion. Mixed medical/surgical intensive care unit, tertiary referral. Thirty-five randomly selected, mechanically ventilated, enterally fed critically ill patients (median APACHE II score 19 on admission). On day 2 either 70 or 200 mg erythromycin or saline was administered intravenously over 20 min. Gastric emptying was measured using the [13C]octanoic acid breath test. The gastric emptying coefficient (GEC) and half-emptying time (t1/2) were calculated from the area under the 13CO2-recovery curve. Pre-treatment gastric emptying measurements were similar in all three patient groups. Treatment with both doses of erythromycin significantly reduced the gastric t1/2: 70 mg, 98 min (IQR 88-112); 200 mg, 86 min (75-104); vs. placebo, 122 min (102-190) (p