Efficacy of pre-scan beta-blockade and impact of heart rate on image quality in patients undergoing coronary multidetector computed tomography angiography

Michael D. Shapiro, Antonio J. Pena, John H. Nichols, Stewart Worrell, Fabian Bamberg, Nina Dannemann, Suhny Abbara, Ricardo C. Cury, Thomas J. Brady, Udo Hoffmann

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

Objective: While beta-blockers are routinely administered to patients prior to coronary computed tomography angiography (CTA), their effectiveness is unknown. We therefore assessed the efficacy of beta-blockade with regards to heart rate (HR) control and image quality in an unselected patient cohort. Methods: We studied 150 consecutive patients (104 men/46 female; mean age, 56 ± 13 years) referred for coronary CTA. Intravenous metoprolol (5-20 mg) was administered to patients with a HR >65 beats per minute (bpm). The goal HR was defined as an average HR <65 bpm without a single measurement above 68 bpm. Results: Overall, 45% (68/150) of patients met the HR criteria for beta-blocker administration of which 76% (52/68) received metoprolol (mean dose 12 ± 10 mg). Of the 52 patients who received beta-blocker versus the 98 who did not, 18 (35%) versus 62 (64%) patients achieved the goal HR, respectively. All patients who achieved the target HR had an evaluable CTA while five patients who did not achieve the target HR had at least one non-evaluable coronary artery due to motion artifact. There was also a significant reduction in any motion artifact among those who achieved the goal HR as compared to those who did not (p = 0.001). Logistic regression revealed an increase in the odds of stair step artifact of 11.6% (95% CI: 2.4% decrease, 27.5% increase) per 1 bpm increase in the standard deviation of scan HR. Conclusion: Overall, efficacy of beta-blocker administration to reach target HR is limited. Improvements in CT scanner temporal resolution are mandatory to achieve consistently high image quality independent of HR and beta-blocker administration.

Original languageEnglish (US)
Pages (from-to)37-41
Number of pages5
JournalEuropean Journal of Radiology
Volume66
Issue number1
DOIs
StatePublished - Apr 1 2008

Keywords

  • Beta-blocker
  • Computed tomography angiography
  • Heart rate
  • Image quality
  • Multidetector computed tomography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Efficacy of pre-scan beta-blockade and impact of heart rate on image quality in patients undergoing coronary multidetector computed tomography angiography'. Together they form a unique fingerprint.

  • Cite this