The prognostic impact of renal function decline during hospitalization for myocardial infarction

Area of Science:

• Cardiology
• Nephrology
• Clinical Epidemiology

Background:

• Myocardial infarction (MI) is a leading cause of mortality worldwide.
• Renal function is a known predictor of outcomes in cardiovascular diseases.
• The prognostic impact of transient versus permanent renal function decline during MI hospitalization requires further clarification.

Purpose of the Study:

• To investigate the association between renal function status during hospitalization and the 5-year all-cause mortality risk in patients with myocardial infarction.
• To differentiate the mortality risk associated with transiently moderate, permanently moderate, and severe renal insufficiency.

Main Methods:

• A cohort study of 5659 patients hospitalized for MI between 2006 and 2018.
• Patients were categorized into four groups based on estimated glomerular filtration rate (eGFR) levels during hospitalization: normal, transiently moderate, permanently moderate, and severe renal insufficiency.
• Survival analysis was performed to assess 5-year all-cause mortality.

Main Results:

• Permanently moderate renal insufficiency was associated with a significantly increased 5-year all-cause mortality risk (HR: 2.27, 95% CI: 1.87-2.75).
• Transiently moderate renal insufficiency also indicated a similar increased mortality risk (HR: 2.08, 95% CI: 1.70-2.55).
• No statistically significant difference in mortality risk was observed between the transient and permanent moderate renal insufficiency subgroups.

Conclusions:

• Even a temporary decline in eGFR to moderate insufficiency levels during MI hospitalization is a significant prognostic indicator.
• Monitoring renal function fluctuations during MI hospitalization is crucial for risk stratification and patient management.
• Both transient and permanent moderate renal insufficiency portend a similar, elevated risk of long-term mortality in MI patients.