Heart rate reduction during Coronary computed tomography angiography: A randomized comparison of metoprolol alone vs metoprolol plus ivabradine
Keywords:
Coronary CT angiography, ivabradine, metoprololAbstract
Background: Coronary CT angiography (CCTA) is a first line investigation in patients with suspected coronary artery disease. Heart rate control using beta blockers and ivabradine improves the image quality and diagnostic accuracy of CCTA. Objective: To establish the efficacy of Metoprolol vs Metoprolol plus Ivabradine one hour before CCTA for the heart rate reduction and thus improving CCTA quality. Methods: Patients undergoing CCTA meeting inclusion criteria were randomized into three groups. Arm I was administered metoprolol 200 mg., Arm II was administered metoprolol 200 mg. plus ivabradine 2.5 mg. while Arm III was administered metoprolol 200 mg plus ivabradine 5 mg. one hour before scan. Blood pressure, heart rate before, during and after scan were recorded. Results: A total of 72 patients were included in the study, 24 patients in each group. Target heart rate of ≤ 65 bpm was achieved in 95.8% of Arm III. Heart rate reduction in Arm I was 17.63±6.48, in Arm II was 20.38±6.66 and in Arm III was 22.21±7.06 (p=0.06). CCTA image quality with Arm III had high diagnostically coronary segments imaging compared to Arm I and II. Conclusion: Metoprolol and ivabradine 5 mg. are an established effective heart rate reducing agent and good image quality in patients undergoing CCTA.
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