Post-operative Hemoglobin Trends for Patients Undergoing Bariatric Surgery: A Retrospective Observational Study

Area of Science:

• Bariatric Surgery Outcomes
• Gastrointestinal Surgery Safety
• Postoperative Hemorrhage Detection

Background:

• Same day bariatric surgery programs are increasing, but early detection of post-operative bleeding remains uncertain.
• Observational studies suggest similar outcomes for same day vs. inpatient bariatric surgery, but bleeding risks require further investigation.

Purpose of the Study:

• To compare hemoglobin trends between patients who did and did not develop post-operative bleeding after bariatric surgery.
• To determine if hemoglobin values can predict early post-operative bleeding in same day surgery patients.

Main Methods:

• A retrospective study compared hemoglobin values (pre-operative, 4-hour post-operative, and post-operative day 1 morning) in 1,457 patients undergoing sleeve gastrectomy or gastric bypass.
• Patients were stratified into groups based on the development of bleeding requiring transfusion or intervention.
• Time to bleeding signs and intervention were analyzed for patients with clinically significant bleeding.

Main Results:

• Of 1,457 patients, 39 (2.7%) developed bleeding. Pre-operative and 4-hour post-operative hemoglobin levels were similar between groups.
• Post-operative day 1 morning hemoglobin levels were significantly lower in patients who bled (10.7 g/dL vs. 12.5 g/dL; p < 0.001).
• The median time to the first clinical sign of bleeding was 9 hours, and the median time to intervention was 23 hours.

Conclusions:

• Hemoglobin trends did not diverge until the morning of post-operative day 1, after the typical same day surgery discharge window.
• Clinical signs of bleeding often manifest after the standard observation period for same day bariatric surgery.
• These findings suggest that next-day discharge may be a safer alternative for bariatric surgery patients to allow for adequate bleeding detection.