Key result
Decreasing atrial sensitivity to 0.5 mV or less limits far-field QRS sensing to ~20%.
Why the study?
Far-field QRS complex sensing through bipolar atrial leads may cause pacemaker function disturbances and affect certain pulse generator algorithms, but its prevalence and timing are not well characterized.
Population
30 patients with permanent bipolar atrial lead and DDDR pulse generator
Comparison
Different atrial amplifier sensitivity settings
Design
Observational study with intracardiac electrograms obtained by telemetry
Authors
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May warrant programming atrial sensitivity ≥0.5 mV to limit far-field sensing; hypothesis-generating for device optimization.
Observational (n=30)
Far-field QRS sensing is universally present with bipolar atrial leads at high sensitivities, highlighting the importance of appropriate sensitivity settings to prevent pacemaker malfunction.
BRANDT et al. (2000) conducted an observational in Patients with permanent bipolar atrial lead and DDDR pulse generator (n=30). Atrial amplifier sensitivity settings was evaluated on Occurrence and timing of far-field QRS complex sensing. Far-field QRS complex sensing via the atrial bipolar lead was universally demonstrable at maximum sensitivity (0.1 mV), but occurred in only 20% of patients at a sensitivity of 0.5 mV or less.
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