| Sumario: | To evaluate variable helical pitch (VHP) protocol for pre-intervention evaluation of transcatheter aortic valve implantation (TAVI). 60 patients (M/F 39/21, Mean age 59 ± 13 years) with aortic valvular disease who underwent CT scan for preoperative assessment of TAVI were randomly divided into two groups. Group A, performed VHP scan mode with ECG-gated scans for chest area by non-ECG-gated abdominal scans. Contrast agent: kg * 1.0 ml, flow rate 4.0 ml /s. Group B used conventional two injections protocol to scan retrospectively ECG-gated CTA of the aortic root and heart (Contrast agent: kg * 0.7 ml, flow rate 4.5ml / s) and non-ECG-gated CTA of the aorta / iliac artery / femoral artery respectively (Contrast agent: kg * 1.1 ml, flow rate 3.0 ml / s). Statistical analysis was performed on the image quality, radiation dose, software measurement report, and contrast agent usage of the two sets of data. There was no statistically significant difference (P>0.05) in the CT values of the thoracic aorta, abdominal aorta, coronary artery, and iliac artery between the two sets of images. After post-processing analysis using 3mensio software, both sets of scanning data were able to evaluate the patient's peripheral vascular access, sinus height, degree of coronary artery stenosis, and measure the diameter of the ascending aorta, aortic root, and aortic ring. In terms of patient radiation dose, Group A (DLP=706.4 ± 49.1) showed a significant decrease compared to Group B (DLP=923.8±56.6) (P<0.001). The usage of the two groups of contrast agents was statistically significant (P<0.001). The "one-stop" scan using the VHP protocol for preoperative TAVI evaluation can significantly reduce the radiation dose and contrast agent consumption without affecting the image quality and measurement data, which show great potential value in clinical routine for TAVI preoperative evaluation.
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