Abstract
Intracardiac signals from 66 patients undergoing permanent pacemaker implantation have been analyzed. Intracardiac wave form was obtained at the time of insertion of the endocardial electrode and at 3rd and 7th day after implantation using temporary-permanent technique. At the implantation of the electrode, three types of right ventricular electrographic pattern were identified. Type I pattern (S-pattern) was most frequently seen in 47% of the patients. Change of ST-segment and T-wave configuration was observed until the 7th day after implantation. T-wave inversion was occurred about 80% of the patients. ST-segment elevation was observed about 72% of the peak-to-peak Rwave amplitude at implantation but found to be decreased to the 18% of the peak-to-peak value at the 3rd day after implantation. The peak-to-peak voltage was found to be changing in the early stage of implantation. Intracardiac signals from the right atrium was recorded and ST-segment and A-wave amplitude was analyzed during 7 days. Recording of the intracardiac signals were useful for the avoidance of the electrode complication i. e. threshold elevation, sensing abnormalities, catheter floating and myocardial perforation.
