Methods
The CFR study was performed in 67 consecutive patients (mean age 48±13 years) using ultrasound diagnostic system Vivid 7 GE Healthcare with a M3S narrow-band sector transducer within 1 week before quantitative coronary angiography (QCA). Patients with single-vessel RCA stenosis area >50% consisted group 1; patients without RCA stenosis area >50% were in group 2. The distal segment (d) of the RCA was examined from the apical long-axis position of the left ventricle in the modified two- or three-chamber view. Doppler velocity patterns were obtained without contrast enhancement in the dRCA at baseline and after intravenous dipyridamole infusion (up to 0.84 mg/kg). CFR was calculated as the ratio of hyperemic to basal peak diastolic velocity in the dRCA.
Methods
The CFR study was performed in 67 consecutive patients (mean age 48±13 years) using ultrasound diagnostic system Vivid 7 GE Healthcare with a M3S narrow-band sector transducer within 1 week before quantitative coronary angiography (QCA). Patients with single-vessel RCA stenosis area >50% consisted group 1; patients without RCA stenosis area >50% were in group 2. The distal segment (d) of the RCA was examined from the apical long-axis position of the left ventricle in the modified two- or three-chamber view. Doppler velocity patterns were obtained without contrast enhancement in the dRCA at baseline and after intravenous dipyridamole infusion (up to 0.84 mg/kg). CFR was calculated as the ratio of hyperemic to basal peak diastolic velocity in the dRCA.
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