Oral supplements (OS) containing carbohydrates are being used 2h before anesthesia. The addition of a nitrogen source would improve these drinks designed for the abbreviation of preoperative fasting. The gastric emptying of an oral supplement containing whey protein in addition to carbohydrates was investigated. This is a randomized crossover study including six healthy young volunteers who were submitted to abdominal MRI in 3 phases: 1) after a overnight fast, 2) after drank 200 mL of an OS containing whey protein and carbohydrates (no lipids), and 3) 3h after ingestion of the mentioned OS. The gastric residual volume (GRV) will be evaluate by MRI. The overall findings would allow us to conclude whether the GRV, assessed by MRI, in healthy young volunteers after three hours of the ingestion of 200 ml of an oral supplement containing carbohydrates associated with whey proteins is similar to the GRV found after an overnight fast. This pilot study will add important information to allow future randomized trials including an arm with patients undergoing elective surgical procedures with a 3h fasting after the ingestion of an OS containing whey protein and carbohydrates.
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Gastric Residual Volume
Timeframe: 3 hours