• Isabel Pinto Amorim das Virgens, CarvalhoAna Lúcia Miranda deALM0000-0002-6597-1102MSc. Dietitian, Surgical Oncology Department, Luiz Antônio Hospital, Liga Norteriograndense Contra o Câncer, Natal (RN), Brazil., Yasmim Guerreiro Nagashima, Flavia Moraes Silva, and FayhAna Paula TrussardiAPT0000-0002-9130-9630PhD. Dietitian and Associated Professor, Department of Nutrition, Universidade Federal do Rio Grande do Norte (UFRN), Natal (RN), Brazil..
• BSc. Dietitian and Master's student, Postgraduate Program on Health Sciences, Universidade Federal do Rio Grande do Norte (UFRN), Natal (RN), Brazil.
• Sao Paulo Med J. 2020 Sep 1; 138 (5): 407413407-413.

BackgroundDuring a surgical procedure, patients are often subjected to fasting for times that are more prolonged than the ideal, which may lead to complications.ObjectiveTo evaluate the duration of perioperative fasting and its association with postoperative complications, length of hospital stay (LOS) and mortality among gastric and colorectal cancer patients.Design And SettingCohort study developed in a surgical oncology hospital in the city of Natal (Rio Grande do Norte, Brazil).MethodsPatients aged over 18 years were included. The Clavien-Dindo surgical complication scale was used to evaluate occurrences of postoperative complications. LOS was defined as the number of days for which patients stayed in the hospital after surgery, or until the day of death.ResultsSeventy-seven patients participated (59.8 ± 11.8 years; 54.5% females; 70.1% with bowel tumor). The incidences of postoperative complications and death were 59.7% and 3.9%, respectively. The duration of perioperative fasting was 59.0 ± 21.4 hours, and it was higher among non-survivors and among patients with prolonged hospital stay (≥ 6 days). For each one-hour increase in the durations of perioperative and postoperative fasting, the odds of prolonged hospitalization increased by 12% (odds ratio, OR = 1.12; 95% confidence interval, CI 1.04-1.20) and 5% (OR = 1.05; 95% CI 1.02-1.08), respectively.ConclusionProlonged perioperative fasting, especially in the postoperative period, was observed in a sample of patients with gastric and colorectal cancer, and this was an independent predictor of LOS.

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