Pneumatosis Intestinalis and Pneumoperitoneum After Lung Transplantation: Single-Center Experience and Systematic Review.

Background: Pneumatosis intestinalis (PI) and pneumoperitoneum are some of the complications after lung transplantation (LT). But only limited reports are published. The purpose of this study is to review our experience and perform a systematic review to discuss the possible causes, risk factors, and management. Methods: We reviewed the characteristics, management, and outcome of the patients who developed PI or pneumoperitoneum after LT in our institution from 2013 to 2022. We also performed a systematic review to discuss the management and outcome. Results: PI and pneumoperitoneum were found in 15 out of 729 patients (2.06%) in our institution. We also found 50 patients in the systematic review. Tracheostomy was performed in 40% and gastrointestinal procedures were performed in 55.6%. Laparotomy was performed in 23.4%. A total of 44.6% of patients had benign physical exams or no symptoms. Rejection was seen in 42.9%. A total of 28.6% of patients died during follow-up periods. Conclusions: This report has the largest number of patients so far with PI and pneumoperitoneum after LT. These conditions have a high rejection and high mortality rate. Mechanical ventilation, tracheostomy, gastrointestinal procedure, CMV infection, Clostridium difficile (C. difficile) infection, and immunosuppression can be the risk factors, and the management includes laparotomy or conservative management. It is generally recommended to proceed with laparotomy if patients have portal venous gas, elevated white blood cell count, elevated lactic acid level, decreased bicarbonate level, elevated amylase level, metabolic acidosis, abdominal tenderness, or abdominal distension. Otherwise, most of the patients recover with conservative management with nil per os (NPO), metronidazole, ganciclovir, antibiotics, high-flow oxygen, and holding mycophenolate mofetil (MMF).