Michal Chudzik, Jerzy Krysztof Wranics, Janusz Zrobek, Karol Bartczak, Janusz Kawinski.
Department of Cardiology, Institute of Cardiology, Medical Academy, Lodz, Poland
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The study population consisted of 38 patients
(pts): Gr I – 18 pts – 10 males, 8 females, with previous open heart surgery
(coronary-artery bypass), mean age 64±6 years, and Gr II (as control group) – 20 pts –
12 males, 8 females, mean age 72±4 years. The patients with previous cardiac surgery
had a similar indication for pacing [10 pts with sinus node disease and 8 pts with
atrioventricular (AV) block] to those without (10 pts with sinus node disease and 10
with AV block). Atrial passive fixation lead BIOTRONIK SYNOX SX 53-JBP and DDD(R)
pacemaker was implanted in all patients in both groups. SYNOX SX 53-JBP is 3-tines
atrial lead with Fractal Iridium Coating, with small geometric lead tip (surface area
1.3 mm2). Small lead body diameter 2.2 mm (6.6 F) should provide superb
intraoperative handling characteristic. “J”-shaped atrial lead in patients without
cardiac surgery was implanted into the trabeculae at base of the atrial appendage
and in the majority of patients with previous coronary-artery bypass, the atrial lead
was positioned laterally rather than in the typical atrial appendage position. At the
time of pacemaker implantation: duration of atrial lead fixation, the voltage pacing
threshold (unipolar configuration) at constant pulse width of 0.5 ms and “P wave”
amplitude (bipolar configuration) of the sensed endocardial atrial electrogram were
measured. Chronic atrial pacing threshold, “P wave” amplitude were measured in the
same manner at 3 - months follow-up. The frequency of atrial lead displacement was
measured during follow-up.
Statistical analysis
Student”s t-test was used to analyze differences in paired data.
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