Postdischarge major bleeding, myocardial infarction, and mortality risk after coronary artery bypass grafting

Area of Science:

• Cardiovascular Surgery
• Clinical Outcomes Research
• Hemorrhagic Complications

Background:

• Post-coronary artery bypass grafting (CABG) complications, including major bleeding and myocardial infarction, significantly impact patient survival.
• Understanding the comparative mortality risks of these events is crucial for optimizing post-operative care and risk stratification.

Purpose of the Study:

• To determine the incidence and mortality risk associated with major bleeding occurring after CABG.
• To compare the mortality risk of post-discharge major bleeding with that of post-discharge myocardial infarction in CABG patients.

Main Methods:

• A nationwide cohort study in Sweden (2006-2017) included patients undergoing first-time isolated CABG.
• Individual patient data were merged from multiple Swedish registries (SWEDEHEART and others).
• Piecewise Cox proportional hazards models were used to analyze the association between major bleeding/myocardial infarction and subsequent mortality.

Main Results:

• Out of 36,633 patients, 6.6% experienced major bleeding and 6.1% had a myocardial infarction.
• Major bleeding was linked to substantially increased mortality risk at <30 days (aHR=20.2), 30-365 days (aHR=3.8), and >365 days (aHR=1.8).
• Myocardial infarction showed similar elevated mortality risks: <30 days (aHR=20.0), 30-365 days (aHR=4.1), and >365 days (aHR=1.8).

Conclusions:

• Post-discharge major bleeding after CABG carries a substantial and comparable increase in mortality risk to that of post-discharge myocardial infarction.
• These findings underscore the importance of monitoring and managing bleeding events post-CABG to mitigate long-term mortality.
• The similar mortality impact of bleeding and infarction suggests a shared pathway or systemic effects influencing outcomes after CABG.