Key result
Medtronic SP 342 tined lead demonstrates low pacing thresholds, averaging 0.4 V in the ventricle.
Why the study?
A new transvenous tined unipolar lead was developed to improve flexibility and vein selection for dual-chamber pacing systems.
Does the Medtronic SP 342 transvenous tined unipolar lead provide adequate electrical parameters for atrial and ventricular pacing?
Observational (n=56)
Does the Medtronic SP 342 transvenous tined unipolar lead provide adequate electrical parameters for atrial and ventricular pacing?
The Medtronic SP 342 transvenous tined unipolar lead demonstrates acceptable electrogram amplitudes, stimulation thresholds, and impedances for both atrial and ventricular pacing, particularly in dual chamber systems.
Answers are grounded in this paper and cite their sources.
May support SP 342 lead feasibility in dual-chamber pacing; leaves open prospective validation before wider use.
A new transvenous tined unipolar lead (Medtronic SP 342) has been implanted in 56 patients; 35 leads were positioned in the atrium and 34 in the ventricle. The lead comprises a trifilar DBS-conductor within an insulation of polyurethane, four symetrically placed polyurethane tines furnished with scallops and a platinum-iridium ring-tipped electrode. The scallops in the tines ensure flexibility and a small effective diameter of the lead which makes the choice of vein less critical than with most previous tined leads. It allows use of the same normally sized vein for a second lead for dual-chamber sensing pacing. Mean atrial and ventricular electrogram amplitudes (+/-SD) were 4.6 +/- 1.2 mV and 8.8 +/- 4.4 mV; mean atrial and ventricular stimulation thresholds were 0.8 +/- 0.3 V and 0.4 +/- 0.2 V; and mean atrial and ventricular lead impendances were 415 +/- 114 ohms and 456 +/- 105 ohms, respectively. The results of this study show that the SP 342 lead is useful especially in dual chamber systems.
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Kruse et al. (1983) reported an observational. Medtronic SP 342 transvenous tined unipolar lead was evaluated on Atrial and ventricular electrogram amplitudes, stimulation thresholds, and lead impedances. The Medtronic SP 342 transvenous tined unipolar lead demonstrated mean atrial and ventricular stimulation thresholds of 0.8 V and 0.4 V, respectively, in 56 patients.
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