Preoperative Fasting and Dehydration in Elderly Patients: A Concerning Correlation

We must acknowledge our role in contributing to patient dehydration through prolonged preoperative fasting. It is common practice to fast patients overnight before surgery, but this often leads to dehydration. Many patients arrive at the operating theatre with a urine or serum osmolality exceeding 800, a clear indicator of dehydration.

However, if we allow patients to drink fluids until 2 hours before their scheduled surgery, they typically maintain normal urine or serum osmolality and remain in a state of euvolemia. This simple change can significantly reduce the risk of complications.

Furthermore, bowel preparation, a common procedure before abdominal surgery, can exacerbate dehydration by causing fluid deficits and impairing renal function.

A study conducted on 200 elderly patients admitted to medical wards for emergency surgery revealed that 37% were dehydrated. These findings highlight the prevalence of dehydration in this vulnerable population and underscore the need for improved preoperative care protocols.

By modifying current practices to include shorter fasting periods and careful monitoring of fluid balance, we can minimize the risk of dehydration and its associated complications in elderly surgical patients.