Incidence and outcome of gastrointestinal complications after cardiopulmonary bypass

Area of Science:

• Cardiovascular Surgery
• Gastroenterology
• Critical Care Medicine

Background:

• Gastrointestinal complications (GI-complications) following cardiopulmonary bypass (CPB) are infrequent but linked to significant mortality and increased healthcare expenses.
• Understanding the incidence and characteristics of these complications is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the incidence, patient demographics, and post-operative course of GI-complications after CPB.
• To identify risk factors and patterns associated with GI-complications in patients undergoing CPB.

Main Methods:

• Retrospective analysis of 8869 adult patients who underwent CPB between 1995 and 2002.
• Comparison of patients with post-operative GI-complications to a control group of 1057 patients operated on CPB between 05/2000 and 04/2001.
• Review of patient charts for incidence, type of GI-complication, timing of diagnosis, and pre-operative factors.

Main Results:

• The incidence of GI-complications was 0.79%, with a mortality rate of 21.5% compared to 3% in the control group (P<0.05).
• Most common complications included upper GI-tract bleeding (58%), pancreatitis (11%), and cholecystitis (10%), diagnosed on average 9.2 days post-surgery.
• Patients with GI-complications had more frequent thoracic aorta surgery, prolonged CPB time, and required re-thoracotomy, with no significant differences in pre-operative comorbidity or EuroSCORE.

Conclusions:

• GI-complications after CPB are rare but severe, carrying a high mortality risk.
• A high degree of clinical vigilance is necessary for early diagnosis, as most complications arise after an initially uneventful post-operative period.
• While age, comorbidity, and EuroSCORE were similar between groups, specific surgical factors like prolonged CPB time and re-thoracotomy were associated with increased risk.