Assessment of 24-hour gastric pH measurements in trauma patients receiving intravenous famotidine by intermittent bolus versus continuous infusion administration

OBJECTIVE: To compare the effects of intermittent bolus versus continuous infusion intravenous famotidine on gastric pH in critically ill trauma patients. DESIGN: Twenty patients were randomized to receive famotidine by intermittent bolus or continuous infusion for 24 hours. Patients fasted during the study period. Hourly gastric pH measurements were made using an indwelling sensor/sump tube. SETIING: The study was conducted in a university teaching hospital. PARTICIPANTS: Adult patients admitted to the neurosurgical or surgical/trauma intensive care unit within 72 hours of traumatic injury were enrolled in the study if they had two consecutive hourly gastric pH readings of 2-antagonists. MAIN OUTCOME MEASURES: Groups were compared with regard to (1) total dose of famotidine received/24 hours, and (2) number of dosage changes required to maintain a gastric pH value of ≥4. RESULTS: The median dose of famotidine required to maintain a gastric pH ≥4 was 50 mg/24 h (25th–75th percentiles = 40–55 mg) in the intermittent bolus group compared with 42 mg/24 h (25th–75th percentiles = 42–52 mg) in the continuous infusion group (p=0.9577). A dosage increase was required by 5 of 8 patients (62 percent) receiving intermittent bolus therapy, whereas only 2 of 8 patients (25 percent) in the continuous infusion group required a dosage adjustment (p=0.315, power=0.318). CONCLUSIONS: Intravenous famotidine (40–50 mg/d) effectively controlled gastric pH in critically ill trauma patients. Patients treated with intermittent bolus therapy required slightly more drug and more frequent dosage adjustments to achieve a gastric pH ≥4. These differences did not reach statistical significance.