Effect of cardiac function on aortic peak time and peak enhancement during coronary CT angiography.
OBJECTIVE
To examine the manner in which cardiac function affects the magnitude and timing of aortic contrast enhancement during coronary CT angiography (CTA).


METHODS
Twenty-nine patients (21 men, 8 women; mean age, 64.4+/-13.4 years; mean weight, 59.4+/-10.3 kg) underwent measurement of cardiac output within 2 weeks of coronary CTA. The cardiac output of each patient was measured by the thermodilution technique and the cardiac index was calculated from the body surface area. During coronary CTA, attenuation of the descending aorta was measured at the workstation every 3s. The aortic peak time (APT) and aortic peak enhancement (APE) of each patient were calculated. Pearson's correlation coefficient analysis was used to investigate the relationships between the cardiac output or cardiac index and APT or APE. Furthermore, the relationship between patient factors or parameters on test bolus injection and APT or APE was also evaluated.


RESULTS
The range of cardiac output, cardiac index, APT, and APE was 1.55-10.46 L/min (mean: 4.77+/-2.13), 1.11-5.30 L/(min-m(2)) (mean: 3.28+/-1.08), 25-51 s (mean: 38.3+/-7.5), and 273.1-598.1 HU (mean: 390.4+/-72.1), respectively. With an increase in the cardiac index, both APT (r=-0.698, p<0.0001) and APE (r=-0.573, p=0.0009) decreased. There were significant correlations between the patient body weight and APT and APE with the test bolus injection, and with APT and APE during coronary CTA.


CONCLUSIONS
The APT and APE during coronary CTA are closely related to cardiac function.
Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. sakai@shs.kyushu-u.ac.jp
Shuji
S
Sakai
Hidetake
H
Yabuuchi
Akiko
A
Chishaki
Takashi
T
Okafuji
Yoshio
Y
Matsuo
Takeshi
T
Kamitani
Taro
T
Setoguchi
Hiroshi
H
Honda
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging*; D001027:Aortography; D001835:Body Weight; D002302:Cardiac Output; D003287:Contrast Media; D017023:Coronary Angiography; D005260:Female; D006801:Humans; D007472:Iohexol; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000000981:diagnostic imaging; D013318:Stroke Volume; D013815:Thermodilution; D014057:Tomography, X-Ray Computed
D003287:Contrast Media; D007472:Iohexol