Implantable atrial defibrillator with a single-pass dual-electrode lead
Hung-Fat Tse, MBBS*,
Chu-Pak Lau, MD*,
Barry M. Yomtov, MSEBE and
Gregory M. Ayers, MD, PhD
* Division of Cardiology, Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong, China
InControl Inc., Redmond, Washington, USA
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Figure 1 Single-pass, dual-electrode implantable (Solo) lead used for transvenous atrial defibrillation. Note the spring coil of the coronary sinus electrode after the stylet is withdrawn (bottom).
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Figure 2 Posteroanterior (PA) view of cine images showing different electrode locations of the Solo lead when different interelectrode spacings were used. (A) Solo lead with 5-cm interelectrode spacing resulted in the electrodes positioned in low right atrium and midcoronary sinus. (B) Solo lead with 9-cm interelectrode spacing allowed optimal positioning of the electrodes to the mid-right atrium and distal coronary sinus.
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Figure 3 Atrial signal amplitude detected by the Solo lead in right atrial (RA) to coronary sinus (CS) vector during sinus rhythm (SR) and atrial fibrillation (AF). (A) Comparison of the atrial signal amplitudes between different electrode locations. *p < 0.05. Solid bar = all; open bar = LRA-MCS; striped bar = MRA-DCS. (B) Comparison of the atrial signal amplitude during supine and upright posture. *p < 0.05. Solid bar = supine; open bar = upright. DCS = distal coronary sinus; LRA = mid-right atrium; MCS = midcoronary sinus; MRA = mid-right atrium.
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