Key result
Moving a large surface area sensing electrode from the right ventricular apex into the atria caused a marked decrease in R wave sensing but a significant increase in P wave amplitude.
Why the study?
Does the position of a movable sensing electrode affect the detection of the transvenous cardiac electrogram in a canine model?
Population
12 mongrel dogs
Comparison
Specially designed transvenous lead system with… vs Different electrode positions
Design
Preclinical
Authors
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Electrode repositioning alters P/R sensing in canines; leaves open whether movable large-surface electrodes can optimize clinical pacemaker detection.
Does the position of a movable sensing electrode affect the detection of the transvenous cardiac electrogram in a canine model?
A large surface area electrode does not require direct myocardial contact for adequate P and R wave detection, indicating potential for sliding sensing electrodes to optimize pacemaker sensing.
Hughes et al. (1980) studied this question. Electrode position (moving away from right ventricular apex into the atria) vs. Right ventricular apex position was evaluated on R wave and P wave amplitude sensing. Moving a large surface area sensing electrode from the right ventricular apex into the atria caused a marked decrease in R wave sensing but a significant increase in P wave amplitude.
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