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CC BY 4.0 · World J Nucl Med 2024; 23(03): 191-198
DOI: 10.1055/s-0044-1787887
Original Article

Effect of Beta-Blocker Consumption on the Severity and Extension of Perfusion Defects in Dipyridamole Myocardial Perfusion Single-Photon Emission Computed Tomography

Shirin Shahlaee
1   Nuclear Medicine Research Center, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
,
Homa Falsoleiman
2   Cardiovascular Department, Mashhad University of Medical Sciences, Mashhad, IRAN
,
Mahdi Hasanzade Daloee
2   Cardiovascular Department, Mashhad University of Medical Sciences, Mashhad, IRAN
,
Arash Gholoobi
2   Cardiovascular Department, Mashhad University of Medical Sciences, Mashhad, IRAN
,
Ghasem Ali Divband
1   Nuclear Medicine Research Center, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
,
Nasrin Raeisi 
1   Nuclear Medicine Research Center, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
,
Vahid Reza Dabbagh Kakhki 
1   Nuclear Medicine Research Center, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
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Abstract

Background Regarding the less-known effects of beta-blocker consumption on the diagnostic value of the myocardial perfusion scan with dipyridamole stress in coronary artery disease (CAD), we aimed to compare the findings of the scans done on the beta-blocker consumption course and after discontinuation of this medications.

Materials and Methods Thirty patients with probably CAD and abnormal myocardial perfusion scans (presence of reversible defect), who had been treated with beta-blockers for at least 3 months, were studied. Dipyridamole stress phase of myocardial perfusion single-photon emission computed tomography (SPECT) was performed two times with an interval of about 1 week, once after discontinuation of all antianginal and anti-ischemic medications, statins, and beta-blockers for 72 hours prior to the study, and again after discontinuation of all these medications except for beta-blockers. Imaging was done with the same protocol, radiopharmaceutical dose, and imaging parameters. Summed stress score (SSS), summed stress rest, and summed difference scores (SDS), total perfusion deficit (TPD), severity, and extension of myocardial perfusion defects in three coronary artery territories were analyzed, using quantitative perfusion SPECT software.

Results Most variables such as SSS, SDS, TPD, severity, and extension of defects showed a significant difference between the two conditions including beta-blocker consumption and after discontinuing beta-blocker consumption before stress imaging (p < 0.05). Moreover, in patients on treatment with metoprolol, all studied factors including SSS, SDS, TPD, severity, and extension of perfusion defects were significantly reduced when patients consumed beta-blockers before SPECT evaluation (p < 0.05).

Conclusion Beta-blocker consumption can lead to a decrease in the severity and extent of myocardial perfusion defects and therefore probably a decrease in the sensitivity of myocardial scans. Discontinuation of beta-blocker prior to the dipyridamole myocardial perfusion scan can improve diagnostic accuracy.

Keywords

CAD - SPECT - beta-blockers - dipyridamole - myocardial perfusion


Publikationsverlauf

Artikel online veröffentlicht:
24. Juni 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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