Effects of metoprolol on heart pacing threshold value and endocardial electrical signal amplitude in patients with permanent pacemakers / 中国介入心脏病学杂志

60 kg) was given to all the patients 1-3 days after their operation.The pacing threshold and the amplitude of P and R waves on cardiograph were measured before injection and at 10,30,90,180 minutes afterwards.Results No significant changes were oburved in pacing threshold and the amplitade of P and R waves before and after the injection of metoprolol in patients with either newly implanted or replacement of permanent pacemakers.Conclusion Metoprolol tartrate has no effect on atrial and ventricular pacing threshold and the amplitude of P and R waves in patients with permanent pacemakers implantation.