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KMID : 1149020170190010005
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Journal of Korean Society of Computed Tomographic Technology
2017 Volume.19 No. 1 p.5 ~ p.13
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Study on waiting time for CCTA(Coronary CT Angiography) after oral administration of beta blocker according to heart rate level
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Kang Jong-Hyo
Lee Sang-Woo
Kim Yeong-Ran
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Abstract
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Purpose : On Coronary CT Angiography (CCTA), premedication by beta blocker is firstly, generally recommended to control the heart rate. The aim of this study is to evaluate the correlation between changes of Heart rate and time interval.
Materials and Methods : We collected data from 2,466 examinees of healthcare center, from January 2014 to October 2015. Both data of time and heart rate on each three phases (arrival, right before CCTA and during CCTA) are collected. All subjects took beta blocker(bisoprolol, Concor tab, 2.5mg, Merck) when they arrive at healthcare center. The data were classified by groups according to heart rate of arrival. Heart rate lower than 69bpm were classified by group A, 70~7bpm by group B, 80-89bpm by group C, and 90 and over by group D. The correlation between time interval and changes of heart rate was analyzed according to each group. We assessed the changes between heart rate of right before CCTA with natural breathing and during CCTA with breath holding.
Results : On all groups, heart rate variation by beta blocker increased as the time interval longer. We find the timing when the maximum value of heart rate minus average value of heart rate variation by beta blocker meet the condition of less than 65bpm. The timing was at all time at group A, at 30 minute and over at group B except 90~119minute, at 150minute and over at group C and at 180 minute and over at group D. The average of heart rate variation by breath holding was 7.67±5.66(P(0.001).
Conclusions : On CCTA, the time interval before CT scan with premedication could be selected by heart rate level. Additionally, heart rate check with breath holding can be recommended to reduce the unnecessary delay time for preparation.
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KEYWORD
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CCTA, beta blocker, bisoprolol
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