The Impact of Cardiac Dysfunction Based on Killip Classification on Gastrointestinal Bleeding in Acute Myocardial Infarction.

Background: Owing to limited data, the effect of cardiac dysfunction categorized according to the Killip classification on gastrointestinal bleeding (GIB) in patients with acute myocardial infarction (AMI) is unclear. The present study aimed to investigate the impact of cardiac dysfunction on GIB in patients with AMI and to determine if patients in the higher Killip classes are more prone to it.

Methods: This retrospective study was comprised of patients with AMI who were admitted to the cardiac intensive care unit in the Heart Center of the Beijing Chaoyang Hospital between December 2010 and June 2019. The in-hospital clinical data of the patients were collected. Both GIB and cardiac function, according to the Killip classification system, were confirmed using the discharge diagnosis of the International Classification of Diseases, Tenth Revision coding system. Univariate and multivariate conditional logistic regression models were constructed to test the association between GIB and the four Killip cardiac function classes.

Results: In total, 6,458 patients with AMI were analyzed, and GIB was diagnosed in 131 patients (2.03%). The multivariate logistic regression analysis showed that the risk of GIB was significantly correlated with the cardiac dysfunction [compared with the Killip class 1, Killip class 2's odds ratio ( OR ) = 1.15, 95% confidence interval ( CI ): 0.73-1.08; Killip class 3's OR = 2.63, 95% CI : 1.44-4.81; and Killip class 4's OR = 4.33, 95% CI : 2.34-8.06].

Conclusion: This study demonstrates that the degree of cardiac dysfunction in patients with acute myocardial infarction is closely linked with GIB. The higher Killip classes are associated with an increased risk of developing GIB.