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Randomized Controlled Trial
. 2018 Nov-Dec;68(6):584-590.
doi: 10.1016/j.bjan.2018.06.008. Epub 2018 Sep 6.

[Ultrasound dynamics of gastric content volumes after the ingestion of coconut water or a meat sandwich. A randomized controlled crossover study in healthy volunteers]

[Article in Portuguese]
Bruno Mendes Carmona  1 , Clauber Claudino Alves Almeida  2 , Waldônio de Brito Vieira  3 , Mario de Nazareth Chaves Fascio  2 , Lídia Raquel de Carvalho  4 , Luiz Antonio Vane  5 , Fabiano Timbó Barbosa  6 , Paulo do Nascimento Junior  5 , Norma Sueli Pinheiro Módolo  5
Affiliations
Randomized Controlled Trial

[Ultrasound dynamics of gastric content volumes after the ingestion of coconut water or a meat sandwich. A randomized controlled crossover study in healthy volunteers]

[Article in Portuguese]
Bruno Mendes Carmona et al. Braz J Anesthesiol. 2018 Nov-Dec.

Abstract

Background: Adequate preoperative fasting is critical in preventing pulmonary aspiration of gastric content. We proposed to study the sonographic gastric content dynamics after the ingestion of liquid or solid food in healthy volunteers and confront it with current guidelines for preoperative fasting times.

Methods: We performed a prospective, crossover, evaluator-blinded study involving 17 healthy volunteers of both sexes. Each participant fasted for 10 h and was subjected to a baseline gastric ultrasound, intake of 400 mL of coconut water or a 145 g, 355 kcal meat sandwich, and sonographic gastric evaluations after 10 min and every hour until the stomach was completely empty.

Results: At baseline, all subjects had an empty stomach. At 10 min, gastric content [mean + standard deviation (SD)] was 240.4 + 69.3 and 248.2 + 119.2 mL for liquid and solid foods, respectively (p > 0.05). Mean + SD gastric emptying times were 2.5 + 0.7 and 4.5 + 0.9 h for liquid and solid foods, respectively (p < 0.001). For the drink, the stomach was completely empty in 59% and 100% of the subjects after two and four hours, and for the sandwich, 65% and 100% of the subjects after four and seven hours, respectively.

Conclusions: Sonographic gastric dynamics for coconut water and a meat sandwich resulted in complete gastric emptying times higher and lower, respectively, than those suggested by current guidelines for preoperative fasting.

Keywords: Conteúdo gástrico; Dinâmica gástrica; Gastric content; Gastric dynamics; Jejum pré‐operatório; Preoperative fasting; Ultrasound; Ultrassom.

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Figures

Figure 1
Figure 1
Gastric volume (mL) after the ingestion of coconut water, 400 mL, according to ultrasonographic evaluation in 17 health volunteers.
Figure 2
Figure 2
Gastric volume (mL) after the ingestion of a standard meat sandwich according to ultrasonographic evaluation in 17 health volunteers.
See this image and copyright information in PMC

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