Pacing outcomes
LBBP was associated with a lower chronic pacing threshold (MD 0.56, 95% CI 0.47-0.64, I2=39%, P<0.01, volts) and a lower impedance (MD 81.02, 95% CI 24.65-137.40, I2=69%, P<0.01, ohm) on follow up.
All publications reported reduction of QRS duration (QRSd) with LBBP; however, 1 study did not report the data for BVP. LBBP was shown to have a greater reduction in QRSd (MD 25.13, 95%CI 20.06-30.20, I2= 51%, P<0.01, milliseconds). Figure 4.