Abstract：
Traditional radiography angles do not adequately reveal the shape and position of the right ventricular pacing electrode.
This study aimed to explore better radiography angles with the help of cardiac computed tomography (CT).
We analyzed the cardiac CT images of consecutive outpatients from 2018 to 2019. The right anterior oblique (RAO) 30° and the left anterior oblique (LAO) 40° were found to sufficiently display the shape and position of the right ventricular pacing electrode.
A total of 214 consecutive outpatients were enrolled, whose average age was 55.0 ± 13.0 years, and 151 were male (70.6%). Through analyzing the cardiac CT images, the α angle (33.7° ± 6.1) and the γ angle (38.8° ± 8.0) were determined. Furthermore, we verified these angles in 48 patients after pacemaker implantation. The results showed that the ratio of the length of right ventricular electrode using the RAO α angle (≈30°) to the posterior-anterior position (PA position) was 1.099 ± 0.157 vs. 1.053 ± 0.182 (the ratio using the traditional RAO 45°) (P < 0.001). We observed that the relationship between the right ventricular active electrode and the ventricular septum was better identified using the LAO γ angle (≈40°) than the traditional 60° angle.
With the help of cardiac CT, we found that RAO 30° could better show the shape and length of the right ventricular pacing electrode, and LAO 40° could better show the positional relationship between the pacing electrode and the ventricular septum.
This study aimed to explore better radiography angles with the help of cardiac computed tomography (CT).
We analyzed the cardiac CT images of consecutive outpatients from 2018 to 2019. The right anterior oblique (RAO) 30° and the left anterior oblique (LAO) 40° were found to sufficiently display the shape and position of the right ventricular pacing electrode.
A total of 214 consecutive outpatients were enrolled, whose average age was 55.0 ± 13.0 years, and 151 were male (70.6%). Through analyzing the cardiac CT images, the α angle (33.7° ± 6.1) and the γ angle (38.8° ± 8.0) were determined. Furthermore, we verified these angles in 48 patients after pacemaker implantation. The results showed that the ratio of the length of right ventricular electrode using the RAO α angle (≈30°) to the posterior-anterior position (PA position) was 1.099 ± 0.157 vs. 1.053 ± 0.182 (the ratio using the traditional RAO 45°) (P < 0.001). We observed that the relationship between the right ventricular active electrode and the ventricular septum was better identified using the LAO γ angle (≈40°) than the traditional 60° angle.
With the help of cardiac CT, we found that RAO 30° could better show the shape and length of the right ventricular pacing electrode, and LAO 40° could better show the positional relationship between the pacing electrode and the ventricular septum.
摘要：
背景：传统的射线照相角度不能充分揭示右心室起搏电极的形状和位置。
目的：本研究旨在借助心脏计算机断层扫描（CT）探索更好的射线照相角度。
方法：我们分析了2018年至2019年连续门诊患者的心脏CT图像。发现右前斜（RAO）30°和左前斜（LAO）40°足以显示右心室起搏电极的形状和位置。
结果：共纳入214名连续门诊患者，平均年龄55.0±13.0岁,男性151人(70.6%)。通过对心脏CT图像的分析,确定α角（33.7°±6.1）和γ角（38.8°±8.0）。此外，我们在起搏器植入后的48例患者中验证了这些角度。结果表明，使用RAOα角（≈30°）的右心室电极长度与前后位置（PA位置）的比值为1.099±0.157。1.053±0.182（使用传统RAO45°的比率）（P<0.001）。我们观察到，与传统的60°角相比，使用LAOγ角（≈40°）可以更好地识别右心室有源电极与室间隔之间的关系。
结论：在心脏CT的帮助下，我们发现RAO30°可以更好地显示右心室起搏电极的形状和长度，LAO40°能更好地显示起搏电极与室间隔的位置关系。
目的：本研究旨在借助心脏计算机断层扫描（CT）探索更好的射线照相角度。
方法：我们分析了2018年至2019年连续门诊患者的心脏CT图像。发现右前斜（RAO）30°和左前斜（LAO）40°足以显示右心室起搏电极的形状和位置。
结果：共纳入214名连续门诊患者，平均年龄55.0±13.0岁,男性151人(70.6%)。通过对心脏CT图像的分析,确定α角（33.7°±6.1）和γ角（38.8°±8.0）。此外，我们在起搏器植入后的48例患者中验证了这些角度。结果表明，使用RAOα角（≈30°）的右心室电极长度与前后位置（PA位置）的比值为1.099±0.157。1.053±0.182（使用传统RAO45°的比率）（P<0.001）。我们观察到，与传统的60°角相比，使用LAOγ角（≈40°）可以更好地识别右心室有源电极与室间隔之间的关系。
结论：在心脏CT的帮助下，我们发现RAO30°可以更好地显示右心室起搏电极的形状和长度，LAO40°能更好地显示起搏电极与室间隔的位置关系。
