Elevations in serum lithium levels postcystectomy and ileal conduit

Area of Science:

• Nephrology
• Psychiatry
• Urology

Background:

• Robot-assisted radical cystectomy with ileal conduit is a surgical option for muscle-invasive bladder cancer.
• Lithium is a mood stabilizer commonly used for bipolar disorder type 1.
• Patients with urinary diversion may experience altered drug pharmacokinetics.

Purpose of the Study:

• To report a case of elevated lithium levels in a patient with bipolar disorder type 1 after robot-assisted radical cystectomy with ileal conduit.
• To highlight the potential for altered lithium reabsorption in patients with ileal conduits.
• To provide recommendations for managing lithium therapy in this patient population.

Main Methods:

• A case report of a female patient in her 60s with bipolar disorder type 1 undergoing robot-assisted radical cystectomy.
• Monitoring of serum lithium levels postoperatively.
• Adjustment of lithium dosage based on serum levels and clinical response.

Main Results:

• The patient's lithium level increased to 1.38 mmol/L by postoperative day 4, requiring temporary discontinuation.
• Lithium was restarted at a reduced dose (300 mg nightly) on postoperative day 12, achieving therapeutic levels within 3 weeks.
• The patient remained psychiatrically and medically stable during 3 months of follow-up.

Conclusions:

• Ileal conduit formation may contribute to increased lithium reabsorption, necessitating dose reduction and careful monitoring.
• There is a need for clinical guidelines regarding lithium management in patients with urinary diversion.
• Recommendations include increased lithium monitoring, consideration of prophylactic dose reduction, and close psychiatric follow-up.