Ondansetron-associated hypokalemia in a 2-year-old with pre-B-cell ALL

Severe Ondansetron-associated Hypokalemia in a Patient Diagnosed with Aspiration Pneumonia

This case report aims to introduce a patient with severe hypokalemia as one of the rare complications of ondansetron injection. The stroke patient was 56 years old and hospitalized in the emergency department with and purulent sputum. The symptoms and lung computed tomography scan confirmed the diagnosis of aspiration pneumonia. A nasogastric tube was inserted, and food gavage was performed for the patient. The treatment was started with meropenem to manage aspiration pneumonia. The patient could not tolerate the gavage. Consequently, ondansetron was prescribed, but severe hypokalemia of 2.5 mEq/l was developed. The causes of hypokalemia were evaluated. The hematological, biochemical, and liver function tests were done, and the potassium level was measured daily. Afterward, causes of hypokalemia was ruled out and with discontinuation of ondansetron the hypokalemia was resolved. Hypokalemia may be caused by ondansetron. It is required that potassium monitoring be always considered during administrating of this medicine.

Assessment of Ondansetron-Associated Hypokalemia in Pediatric Oncology Patients

Objectives. Ondansetron is a 5-hydroxytryptamine (5-HT3, serotonin) receptor antagonist used as antiemetic prophylaxis preceding chemotherapy administration. Hypokalemia is a rare complication of ondansetron, which may be underreported due to confounding emesis and chemotherapy-induced tubulopathy. We performed a prospective cohort study to determine if ondansetron caused significant hypokalemia independently as a result of renal potassium wasting. Methods. Twelve patients were recruited, with ten completing the study. Blood and urine samples were collected before and after ondansetron administration in patients admitted for intravenous (IV) hydration and chemotherapy. Dietary histories and IV records were analyzed to calculate sodium and potassium balances. Results. We observed an expected drop in urine osmolality, an increase in urine sodium, but no statistically significant change in sodium or potassium balance before and after ondansetron. Conclusion. Ondansetron does not cause significant potassium wasting in appropriately hydrated and nutritionally replete patients. Careful monitoring of serum potassium is recommended in patients with chronic nutritional or volume status deficiencies receiving this medication.