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- W2171869837 abstract "The purpose of this investigation was to compare the acute pacing and sensing characteristics of a new bipolar active fixation atrial pacing lead with those of a unipolar atrial lead of similar design. Pacing threshold voltage and current, lead impedance, and atrial electrogram amplitude and slew rate were measured at the time of surgery in 28 consecutive patients undergoing DDD pacing system implantation. Eleven patients received a Medtronic 6957J–58 unipolar active fixation atrial lead and 17 patients were given a Medtronic 4016–58 bipolar lead. Both leads are polyurethane-insulated with the distal electrode being a platinum alloy screw-helix with a surface area of 8.0 mm2. There were no significant differences in the threshold voltage (1.01 V unipolar versus 1.05 V bipolar) or current (1.93 mA unipolar versus 1.78 mA bipolar) of the two leads. The mean impedance of the bipolar active fixation lead was 618 ohms compared to 479 ohms for the unipolar lead (p = 0.02). The mean amplitude of the atrial electrogram was 4.64 mV for the bipolar lead and 3.11 mV for the unipolar lead (p = 0.02). The atrial electrogram exceeded 5 mV in 10 of 17 patients with the bipolar lead but zero of 11 with the unipolar lead. There was no significant difference in the mean slew rate of the leads (1.09 V./s bipolar versus 0.73 V/s unipolar; p - 0.18). Over a follow-up period of up to 10 months, all patients remained in either the DDD or DDI modes with no episodes of atrial sensing or pacing failure. Bipolar active fixation atrial leads have pacing characteristics similar to unipolar leads of similar design but may be superior for sensing of the atrial electrogram." @default.
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- W2171869837 date "1988-05-01" @default.
- W2171869837 modified "2023-09-26" @default.
- W2171869837 title "Comparison of Unipolar and Bipolar Active Fixation Atrial Pacing Leads" @default.
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- W2171869837 doi "https://doi.org/10.1111/j.1540-8159.1988.tb04549.x" @default.
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