Effects of Heart Rates and Variability of Heart Rates on Image Quality of Dual-Source CT Coronary Angiography

Study Overview
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Brief Summary
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The purpose of this study is to investigate the effects of heart rates (including maximum heart rate, average heart rate and minimum heart rate) and variability of heart rate on image quality of DSCT coronary angiography without control of heart rate experienced in our department.

Detailed Description
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The dual-source CT (DSCT) equipped with two X-ray tubes at 90 degree offset in the gantry can provide temporal resolution 83ms using mono-segmental reconstruction technique. The recent studies about the effect of heart rate on IQ of DSCT coronary angiography which concluded in adequate diagnostic IQ of dual-source CTCA without immediate pre-scanning heart rate control included chronic users of β-blocker focused on the influences of average heart rate, heart rate variability and coronary arterial calcifications on IQ. The effect of blooming artifact of calcification on IQ by far cannot be eliminated. Here, we investigate the effects of maximum heart rate, average heart rate, minimum heart rate and heart rate variability on the motion-related IQ of DSCT coronary angiography in patients without both pre-scanning heart rate control and chronic use of β-blocker agent, compared with that in chronic users of β-blocker agents.

Official Title
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A Retrospective Study of Effects of Heart Rates and Variability of Heart Rates on Image Quality of Dual-Source CT Coronary Angiography With Regard to Motion Artifact.

Conditions
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CT, Coronary Angiography

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: From Oct 2006 to Jan 2007, CT coronary angiographies of 180 consecutive adult patients, were performed in our hospital using a DSCT scanner. After exclusion of the patients according to the exclusion criteria, totally DSCT coronary angiographies of 133 adult patients (N=133) were enrolled in this study. Among those 133 patients, including 97 males and 36 females with a mean age of 53.9 (ranging from 21 to 78 year old), 50 patients were chronic β-blocker users (group 1) while the other 83 patients (group 2) were not chronic user of any medication controlling heart rate Exclusion Criteria: The patients below 18 year old, patients with status post heterotopic heart transplantation (having two hearts in a chest), patients with status post coronary by-pass surgery and patients with post indwelling of coronary arterial stents

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 78 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compare the effects of the heart rate variables on motion-related image qualities of DSCT coronary angiography between the group 1 patients of chronic beta-blocker users and the group 2 patients without medication of any heart-rate lowering agent. |  | About two months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Kappa Statistics, Descriptive Statistics, Chi-square test, Independent t-test, Pearson's correlation and linear regression method for statistic analysis. |  | About two to three months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Image quality, Dual-source CT, Coronary angiography, Heart rate