High-Normal Preoperative Potassium Level Is Associated with Reduced 30-Day Morbidity and Shorter Hospital Stay after Radical Cystectomy.

High-normal preoperative potassium level was associated with better clinical (lower 30-day morbidity) and economical (shorter hospital stay) outcomes in patients undergoing radical cystectomy. We recommend that a randomized controlled trial be performed to investigate whether there is a causal relationship between preoperative potassium supplementation and postoperative complications and length of hospital stay.