Background: P2Y12 inhibitors have differing associations of bradyarrhythmias. Ticagrelor has been shown to increase adenosine plasma concentrations leading to increases in bradyarrhythmias. While clopidogrel and prasugrel have not been shown to have any association with bradyarrhythmias.
Objective: The objective of this study was to determine heart rates after ticagrelor initiation compared to clopidogrel/prasugrel in inferior ST Elevation Myocardial Infarction (STEMI) patients.
Methods: This was a retrospective, multicenter study conducted at 3 primary percutaneous coronary intervention (PCI) centers between January 1, 2017 and September 30, 2022. Adult patients were included if they were diagnosed with an inferior STEMI to the right coronary artery (RCA) and treated with PCI followed by an oral P2Y12 inhibitor. The primary outcome was heart rate at 48 hours or discharge, whichever first, after administration of ticagrelor compared to clopidogrel/prasugrel.
Results: This study reviewed 331 patients, 172 in the ticagrelor group and 159 in the clopidogrel/prasugrel group. There were no statistical differences between groups regarding the primary outcome, with a median heart rate of 76 beats per minute (bpm) [67-85] in the ticagrelor group versus 73 bpm [66-84] in the clopidogrel/prasugrel group ( = 0.238). No differences were observed between groups regarding any secondary outcomes.
Conclusion And Relevance: There were similar heart rates between ticagrelor and clopidogrel/prasugrel. There were also similarities in the ability to tolerate beta-blocker therapy after initiation of a P2Y12 inhibitor. The results of this study suggest that in inferior STEMIs when using ticagrelor as the P2Y12 inhibitor, there are not increased clinical manifestations of bradycardia.
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