A new single lead VDD pacing system.
In 24 patients with advanced heart block and normal sinus node function, a new single lead VDD pacing system was implanted. At implantation, the endoatrial, bipolar electrogram was recorded in all patients. The lead position was checked by means of chest X-ray. At discharge and after 1, 3, and 6 months, testing for myopotential inhibition, telemetric evaluation of the endoatrial potential, and Holter recordings were made. After discharge, 18 patients performed two cardiopulmonary exercise tests at two different rate-matched AV intervals. All investigations showed good AV synchrony and a lack of interferences by myopotentials. The maximum rate-matched AV interval provided a significantly improved exercise capacity, which was more evident in patients with signs of myocardial failure.
Percoco
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GF
Divisione di Cardiologia, Arcispedale S. Anna, Ferrara, Italy.
Ansani
L
L
Barbieri
D
D
Guardigli
G
G
Toselli
T
T
Audoglio
R
R
Antonioli
G E
GE
D000368:Aged; D000369:Aged, 80 and over; D001283:Atrioventricular Node / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004452:Echocardiography; D015716:Electrocardiography, Ambulatory; D005080:Exercise Test; D005260:Female; D006327:Heart Block / Q000628:therapy*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010138:Pacemaker, Artificial; D012032:Refractory Period, Electrophysiological / Q000502:physiology; D012849:Sinoatrial Node / Q000503:physiopathology