2.3 Recording the pacing electrode position
Two nonsurgical doctors independently read the patient’s image data and recorded the distribution position of the pacing electrode using the nine partition method[8]. As shown in Figure 1, with the fluoroscopy guidance, the ventricles in RAO 30° were divided into three equal parts, along the long axis and short axis and divided into nine regions. From left to right and from top to bottom, the ventricles were marked as PS, MS, AS, PM, M, AM, PI, MI and AI. We observed and recorded the pacing electrode site in the nine regions using a two dimensional projection position.