Preoperative Fasting Time and Selected Postoperative Outcomes among Patients Undergoing Abdominal Surgeries: Correlation Study

Amel Gomaa Abd El-Naby, Zeinab M. El-Sayed


Background: Prolonged preoperative fasting time had a negative impact on the recovery of the patient in the postoperative period. Aim of the study: was to determine the relationship between the preoperative fasting time and selected postoperative outcomes among patients undergoing abdominal surgeries at one of the University Hospitals Cairo-Egypt. Research question: What is the relationship between the preoperative fasting time and the selected postoperative outcomes (patients' blood glucose levels, blood pressure and vomiting frequency) among patients undergoing abdominal surgeries? Design: Descriptive-correlation design was utilized. Setting: The study was conducted on waiting areas of general surgery operating room at 2nd and 3rd floor in addition to the general surgical wards at one of the University Hospitals. Subjects: A convenience sample of 60 female & male adult patients with the following inclusion criteria: 1- undergoing abdominal surgeries, 2- have no diabetes or hypertension were recruited in the current study Tools: Two tools were utilized to collect data pertinent to the study; I- A semi-structured interview questionnaire, it contained two parts: 1: Demographic data 2: Surgical patient’s clinical data.  II - Postoperative outcomes data sheet: It included measurement of the three selected postoperative outcomes. Results: The current study findings revealed that nearly three quarters of the study sample fasted for longer than required time with a mean+ SD= 11.1 + 2.5 and more than two third of the study sample had waiting time between 3->6 hrs. There was a significance difference between pre-operative & post-operative, post-operative & baseline readings regarding the systolic blood pressure and between the baseline and the pre-operative diastolic blood pressure. There was a positive moderate correlation between the pre-operative fasting time and the post-operative blood glucose results r=0.41. Also, there was a strong correlation between baseline and preoperative blood glucose results r=0.77, while, There was no correlation  between frequency of vomiting post operatively and age, preoperative fasting time, waiting time, blood glucose, and blood pressure.  Conclusion: There was a correlation between preoperative fasting time and blood glucose level followed by blood pressure while no correlation with vomiting frequency postoperatively. Recommendations: Awareness of heath care team regarding updating evidence-based preoperative fasting guidelines, nurse should measure blood glucose level and blood pressure for the non-diabetic as well as the diabetic patients before the surgical procedure and further studies are needed to determine the optimal fasting time and its effect on postoperative outcomes.

Keywords: Preoperative fasting time, waiting time, abdominal surgery, blood glucose level, blood pressure, postoperative vomiting.

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