Dual chamber pacing with a single lead system: initial clinical results.
A new mode of biphasic pacing was used in 26 patients to assess the feasibility of atrial pacing by means of the floating atrial ring electrodes of a single lead VDD permanent pacing system. During implantation, atrial pacing was possible in 25 patients with a 1-ms total pulse duration, a mean atrial threshold of 1.70 +/- 0.60 V (range, 0.6-3.0), and a mean diaphragmatic threshold of 6.7 +/- 2.5 V (range, 2.5-10.0). At 3 months, the atrial threshold had increased beyond 4.8 V in three patients. In the 22 other patients, the mean atrial threshold was 2.2 +/- 0.5 V (range, 1.50-3.50) in the supine position and 2.5 +/- 0.8 V (range, 1.5-4.8) in the sitting position. Stable atrial capture without diaphragmatic stimulation was achieved in 76% of patients.
Rey
J L
JL
Cardiology Department, University Hospital, Amiens, France.
el Ghelbazouri
F
F
Tribouilloy
C
C
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016275:Atrial Function; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D003964:Diaphragm / Q000502:physiology; D004558:Electric Stimulation; D004562:Electrocardiography; D004566:Electrodes; D004867:Equipment Design; D005240:Feasibility Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011187:Posture; D016683:Supine Position