Fatal hyperammonemia after orthotopic lung transplantation

Area of Science:

• Transplantation Medicine
• Gastroenterology
• Critical Care Medicine

Background:

• A previous report detailed a fatal case of hyperammonemia after orthotopic lung transplantation.
• This study investigates hyperammonemia as a complication of orthotopic lung transplantation.

Purpose of the Study:

• To determine the incidence of hyperammonemia in orthotopic lung transplant recipients.
• To characterize the clinical features and associated risk factors of post-transplant hyperammonemia.
• To assess the impact of hyperammonemia on mortality following lung transplantation.

Main Methods:

• Retrospective cohort analysis of 145 adult patients undergoing orthotopic lung transplantation.
• Monitoring of plasma ammonium levels post-transplantation.
• Analysis of clinical data, including gastrointestinal complications, nutritional support, and underlying diagnoses.

Main Results:

• Six of 145 patients (4.1%) developed hyperammonemia within 26 days post-transplantation.
• Hyperammonemia was associated with a significantly higher 30-day mortality rate (67% vs. 17%, P = 0.01).
• Risk factors included major gastrointestinal complications, total parenteral nutrition, and transplantation for primary pulmonary hypertension.

Conclusions:

• Hyperammonemia is a significant and potentially fatal complication following orthotopic lung transplantation.
• Associated factors include high nitrogen load, medical stressors, primary pulmonary hypertension, and hepatic glutamine synthetase deficiency.
• Prompt recognition and management are vital for improving survival rates in lung transplant recipients.