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Abstract Objective To explore application of active fixed lead in right ventricular pacing. Methods 68 patients underwent implantation of right ventricular pacer using active fixed leads.The magnitude of ST-segment elevation(STSE) and pacing parameters were measured immediately and 15 min later after lead fixation. Pacing QRS duration was mea-sured and compared among different pacing sites. Al patients were fol owed up for 6 months. Results The magnitude of STSE decreased from 7.07± 0.11 mV to1.50±0.23mV (P<0.01), pacing threshold from 1.19± 0.40 V to 0.69±0.12 V (P<0.01), at 15 min after lead fixation in 53 cases. Of 15 cases without STSE, 6 had lead dislocation during operation and 9 had higher pacing thresholds. Pacing site was readjusted in these cases. There was no lead dislocation and no signifi-cant change of pacing parameters during 6 months' fol ow-up (P>0.05). The QRS duration during pacing at the septum of right ventricular outflow tract and middle septum was shorter than that at right ventricular apical and RVOT free wal (P<0.01). Conclusion The active fixation lead pacing is feasible and safe.The septum of right ventricular outflow tract and right ventricular middle septum are suitable pacing sites.
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