Background. Limited evidence exists regarding post-operative diet upgrade post-abdominal aortic aneurysm (AAA) repair and periods of nil by mouth and clear fluids are commonly seen. Prolonged nutrient inadequacy leads to weight loss in an already at-risk population. Aim. To evaluate associations between diet upgrade and gastrointestinal function and determine alignment with current surgical practices which requests bowels open prior to diet upgrade. Methods. A retrospective chart review of patients admitted for AAA repair between October 2018 and March 2019 was performed (n=19). The review included open repair and excluded endovascular repair. Data were collected on the following outcomes: number of days spent nil by mouth (NBM), clear fluids (CF) and free fluids (FF); number of days between bowels opening and full diet commencement; and% weight loss from admission to discharge. Results. Mean duration (days) of prescribed diets were: 1.37 (NBM), 1.79 (CF) and 1.11 (FF). The median time from bowels...

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