Abstract
Beta-blockers are recommended in the first 24 hours after ST-segment elevation myocardial infarction (STEMI) except in those at risk of cardiogenic shock. This retrospective cohort study aimed to assess if early beta-blocker use was associated with cardiogenic shock development in STEMI patients. Cardiogenic shock was assessed in adult patients with STEMI undergoing percutaneous coronary intervention (PCI) with guideline defined risk factors for shock (age above 70 years, systolic blood pressure below 120 mmHg, and heart rate above 120 bpm or below 60 bpm) who did or did not receive a beta-blocker within 24 hours of PCI. Multivariable logistic regression was used to assess the association between cardiogenic shock development and early beta-blocker administration. A total of 216 patients were included, 85 with early beta-blocker administration and 131 without. Patients who received an early beta-blocker versus those who did not had a median (interquartile range) age of 63 (52-71) versus 66 (54-76; P = .2260) and peak troponin of 58.3 (15.0-132.4) ng/mL versus 51.6 (16.6-139.5; P = .9884). Cardiogenic shock occurred in 4.7% (n = 4) patients with early beta-blocker use versus 12.2% (n = 16; P = .0909) without. After backward stepwise logistic regression, early beta-blocker use was not associated with cardiogenic shock (adjusted odd ratio [aOR] 0.334, 95% confidence interval (CI) 0.106-1.047; P = .0599), but those with a peak troponin over 56 ng/mL had an over three-fold increased risk of developing cardiogenic shock (aOR 3.434, 95% CI 1.191-9.902; P = .0224) regardless of beta blocker administration. Early beta-blocker administration in STEMI patients may not be associated with shock development.