[Use of dual-chamber pacemaker. Short and long-term results].
BACKGROUND
Continuous improvement of dual chamber DDD pacemakers, electrode stability and programmed sequential stimulation changed the prognosis of patients implanted with these devices.


OBJECTIVE
To report our experience with the use of dual chamber pacemakers.


METHODS
One hundred seventy six patients (116 male), aged 13 to 91 years old, who received a dual chamber pacemaker implant, are reported. Patients were followed for a mean of 2.6 years.


RESULTS
Indications for DDD pacemaker were complete atrioventricular block in 43%, sick sinus syndrome in 32%, paroxysmal A-V block in 24%. All pacemakers were Siemens-Pacesetter and were provided with an automatic sensing and threshold device. J shaped atrium electrodes were used in 78% of patients and screw-in electrodes in 22%. Post operative complications were displacement of atrial electrode in 8 patients, of ventricular electrode in 6 patients, infection in two patients and a hematoma in one. Chronic parameters, measured after six months, were within expected ranges and allowed a good reprogramming of pacemakers. Long term programming aimed to reduce battery depletion, enhance device performance and improve hemodynamic conditions. Normal sequential stimulation was achieved in 154 patients (87%), 14 (85) patients died of cardiovascular disease not related to pacemaker function. Eight patients were in atrial fibrillation and were reprogrammed to VVI and DDI modes.


CONCLUSIONS
DDD pacemakers are reliable and afford symptomatic relief in a broad spectrum of patients.
Dubernet
J
J
Departamento de Enfermedades Cardiovasculares, Hospital Clínico, Pontificia Universidad Católica de Chile.
Fajuri
A
A
Acevedo
M
M
González
J A
JA
Maturana
G
G
Zalaquett
R
R
Garrido
L
L
De la Paz
F
F
Casanegra
P
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001146:Arrhythmia, Sinus / Q000628:therapy; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D002318:Cardiovascular Diseases / Q000628:therapy*; D005260:Female; D005500:Follow-Up Studies; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013997:Time Factors; D016896:Treatment Outcome
Marcapasos bicamerales. Resultados inmediatos y alejados.