Objective To discuss the feasibility of preoperative
diet by measuring
gastric emptying time of
carbohydrate and
protein nutrient solutions in
healthy volunteers.
Methods A total of 20
healthy volunteers were collected from August 2013 to May 2014.On the morning of the trial,baseline gastric
residual volume of each
volunteer was measured with
magnetic resonance imaging at 8 a.m.,then each of the 20
healthy volunteers took 12.5%
carbohydrate solution 400 ml (containing 40 g of maltodextrin and 10 g of
sucrose) or 12.5%
whey protein solution (containing 50 g
whey protein) in 5 minutes.
Magnetic resonance imaging was conducted to
measure the gastric
residual volume every 25 minutes.The
volunteers were shifted to the other
nutrient solution after a 1-week interval.The
gastric emptying time of both
nutrient solutions was calculated to generate the curves illustrating the process of
gastric emptying.Results The baseline gastric
residual volume of the
volunteers was (14.90 ± 9.39) ml.The total
gastric emptying time of
carbohydrate solution was (104.90 ± 27.98) min (95 % CI 98.64-111.16 min),while that of
whey protein solution was (199.6 ± 34.17) min (95% CI 184.47-214.73 min).There was a significant difference between these two types of
nutrient solution in terms of
gastric emptying time (P < 0.000 1).Conclusions The induction of
anesthesia could be performed 2 hours after
carbohydrate administration,and at least 4 hours after
whey protein administration.