3 Result
In applying these selection criteria, there was a total of 34 patients with cRBBB recruited in the present study. The basic clinical details are shown in Table 1. The age was 72.76 ± 8.71 years (range 58-89 years) with 25 males in total (73.53%). 3 patients had sick sinus syndrome (SSS) while the rest had high-grade atrioventricular conduction block (AVB). Atrial fibrillation (AF) was recorded in 4 patients, and premature ventricular contraction (PVC) was recorded in 2 patients. There was a significant decrease compared to the iQRSd with the pQRSd (144.87±5.22ms vs. 116.18±6.15ms, P < 0.01), see Table 2. The pQRSd was 28.70±3.30ms (95% CI:27.55-29.85ms, P< 0.01) shorter than the iQRSd (Figure2). There were 12 patients with a greater than 30ms shortening in QRS duration after LBBP.