Flora Margarida Barra Bisinotto1, Aline de Araújo Naves2, Hellen Moreira de Lima3, Ana Cristina Abdu Peixoto4, Gisele Caetano Maia5, Paulo Pacheco Resende Junior5, Laura Bisinotto Martins6, Luciano A Matias da Silveira5. 1. Sociedade Brasileira de Anestesiologia, Rio de Janeiro, RJ, Brasil; Universidade Federal do Triângulo Mineiro (UFTM), Hospital de Clínicas, Uberaba, MG, Brasil; Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Botucatu, SP, Brasil; Universidade Federal do Triângulo Mineiro (UFTM), Disciplina de Anestesiologia, Uberaba, MG, Brasil. Electronic address: flora@mednet.com.br. 2. Universidade Federal do Triângulo Mineiro (UFTM), Serviço de Radiologia e Diagnóstico, Uberaba, MG, Brasil. 3. Universidade Federal do Triângulo Mineiro (UFTM), Curso de Graduação em Medicina, Uberaba, MG, Brasil; Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), Belo Horizonte, MG, Brasil. 4. Universidade Federal do Triângulo Mineiro (UFTM), Serviço de Radiologia e Diagnóstico, Uberaba, MG, Brasil; Universidade Federal do Triângulo Mineiro (UFTM), Programa de Pós-Graduação em Ciências da Saúde, Uberaba, MG, Brasil. 5. Universidade Federal do Triângulo Mineiro (UFTM), Hospital de Clínicas, Uberaba, MG, Brasil. 6. Universidade de Ribeirão Preto (UNAERP), Curso de Graduação em Medicina, Ribeirão Preto, SP, Brasil.
Abstract
BACKGROUND AND OBJECTIVES: The current preoperative fasting guidelines allow fluid intake up to 2hours before surgery. The aim of this study was to evaluate the gastric volume of volunteers after an overnight fast and compare it with the gastric volume 2hours after ingestion of 200 and 500mL of isotonic solution, by means of ultrasound assessment. METHOD: Eighty volunteers underwent gastric ultrasound at three times: after 8hours of fasting; 2hours after ingestion of 200mL isotonic saline, followed by the first scan; and on another day, 2hours after ingestion of 500mL of the same solution after an overnight fast. The evaluation was quantitative (antrum area and gastric volume, and the ratio of participants' gastric volume/weight) and qualitative (absence or presence of gastric contents on right lateral decubitus and supine positions. A p-value<0.05 was considered significant). RESULTS: There was no difference in quantitative variables at measurement times (p>0.05). Five volunteers (6.25%) had a volume/weight over 1.5mL.kg-1 at fasting and 2hours after ingestion of 200mL and 6 (7.5%) after 500mL. Qualitatively, the presence of gastric fluid occurred in more volunteers after fluid ingestion, especially 500mL (18.7%), although not statistically significant. CONCLUSION: Ultrasound assessment of gastric volume showed no significant difference, both qualitative and quantitative, 2h after ingestion of 200mL or 500mL of isotonic solution compared to fasting, although gastric fluid content has been identified in more volunteers, especially after ingestion of 500mL isotonic solution.
BACKGROUND AND OBJECTIVES: The current preoperative fasting guidelines allow fluid intake up to 2hours before surgery. The aim of this study was to evaluate the gastric volume of volunteers after an overnight fast and compare it with the gastric volume 2hours after ingestion of 200 and 500mL of isotonic solution, by means of ultrasound assessment. METHOD: Eighty volunteers underwent gastric ultrasound at three times: after 8hours of fasting; 2hours after ingestion of 200mL isotonic saline, followed by the first scan; and on another day, 2hours after ingestion of 500mL of the same solution after an overnight fast. The evaluation was quantitative (antrum area and gastric volume, and the ratio of participants' gastric volume/weight) and qualitative (absence or presence of gastric contents on right lateral decubitus and supine positions. A p-value<0.05 was considered significant). RESULTS: There was no difference in quantitative variables at measurement times (p>0.05). Five volunteers (6.25%) had a volume/weight over 1.5mL.kg-1 at fasting and 2hours after ingestion of 200mL and 6 (7.5%) after 500mL. Qualitatively, the presence of gastric fluid occurred in more volunteers after fluid ingestion, especially 500mL (18.7%), although not statistically significant. CONCLUSION: Ultrasound assessment of gastric volume showed no significant difference, both qualitative and quantitative, 2h after ingestion of 200mL or 500mL of isotonic solution compared to fasting, although gastric fluid content has been identified in more volunteers, especially after ingestion of 500mL isotonic solution.
Authors: Sayali S Khandekar; Jeson R Doctor; Shilpa K Awaskar; Nidhin K Alex; Lipika R Medha; Priya Ranganathan Journal: Indian J Anaesth Date: 2022-04-20