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Updated: Jan 9, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Shock Reduction Programming and Heart Function Recovery in Japanese Patients Undergoing Implantable Cardioverter
Yusuke Sakamoto1, Hiroyuki Osanai1, Yuichiro Sakai1
1Department of Cardiology, Tosei General Hospital Aichi Japan.
Background:
Although implantable cardioverter-defibrillators (ICD) offer prognostic benefit for patients with reduced left ventricular ejection fraction (LVEF), they remain underused in Japan.
Methods And Results:
We analyzed 25 patients who underwent primary prevention ICD implantation. During a median follow-up of 52.6 months, no appropriate shocks occurred, but non-sustained ventricular tachycardia (NSVT) was frequently observed. Two patients underwent antitachycardia pacing. LVEF improved to >35% in nearly half of the patients.
Conclusions:
Cardiac resynchronization therapy and pharmacotherapy possibly improved cardiac function. Unnecessary shock delivery programming may have also contributed to the favorable outcomes.
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