Filter Characteristics of the Atrial Sensing Circuit of a Rate Responsive Pacemaker. To See or Not to See

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Why the study?

Does the filter match of the RS4-SRT pacing system affect atrial sensing reliability?

Structured PICO

Does the filter match of the RS4-SRT pacing system affect atrial sensing reliability?

Population

Patients with acutely implanted pacemaker leads (SRT lead) and rate responsive pacemaker (RS4)

Intervention

Recording and determination of frequency characteristics of intra-atrial electrograms (P waves) from floating orthogonal atrial electrodes

Outcome

Frequency characteristics of P waves and atrial sensing properties of the pacemakersurrogate

Unreliable atrial sensing with the RS4-SRT pacing system is primarily due to an inappropriate filter match (cutoff 35 Hz vs P wave bandwidth 65 Hz).

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Filter mismatch may compromise atrial sensing in RS4-SRT systems; leaves open whether revised cutoffs improve reliability.

Aubert et al. (1989) studied this question.

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