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Updated: Jul 6, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
[Efficacy of cardiac resynchronization therapy-defibrillator for treating patients with chronic heart disease]
Wei Hua1, Shu Zhang, Fang-Zheng Wang
1Cardiac Arrhythmia Center, Fu Wai Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100037, China.
Insights
Cardiac resynchronization therapy-defibrillator (CRT-D) implantation is safe and effective for chronic heart failure patients. This therapy improved cardiac function and reduced sudden cardiac death risk in a one-year follow-up.
Area of Science:
- Cardiology
- Medical Devices
- Electrophysiology
Context:
- Chronic heart failure (CHF) significantly impacts patient quality of life and survival.
- Drug-refractory heart failure presents a therapeutic challenge.
- Sudden cardiac death remains a major concern in heart failure patients.
Purpose:
- To evaluate the clinical efficacy and safety of cardiac resynchronization therapy-defibrillator (CRT-D) in patients with chronic, drug-refractory heart failure.
- To assess the impact of CRT-D implantation on cardiac function and mortality over a one-year period.
Summary:
- Seventeen patients with drug-refractory heart failure (12 dilated cardiomyopathy, 5 ischemic heart disease) underwent CRT-D implantation.
- Successful implantation was achieved in all patients with no complications.
- Over a mean 13-month follow-up, no deaths occurred, left ventricular function improved, and CRT-D successfully managed ventricular arrhythmias.
Impact:
- CRT-D implantation is a feasible and safe treatment option for selected refractory heart failure patients.
- The therapy is associated with improved cardiac function.
- CRT-D implantation demonstrates a reduced risk of sudden cardiac death in this patient cohort.
Objective:
To observed the clinical efficacy of cardiac resynchronization therapy-defibrillator (CRT-D) in selected patients with chronic heart failure one year after implantation.
Methods:
Seventeen patients with drug-refractory heart failure received CRT-D implantation (6 patients were implanted with InSync Sentry). The underlying heart diseases were dilated cardiomyopathy in 12 patients and ischemic heart disease in 5 patients. There were 13 patients with a history of ventricular tachycardia/ventricular fibrillation.
Results:
CRT-D were successfully implanted in all patients without complication. The mean left ventricular pacing threshold was 1.6 V. The defibrillation threshold was no more than 20 J. During a mean follow-up of 13 months, no death occurred and LV function was improved. The shock induced by ventricular tachycardia was delivered in 5 patients and alarming due to heart failure occurred twice in 1 patient.
Conclusions:
The implantation of CRT-D for treating refractory heart failure patients is feasible and safe. The application of CRT-D was associated with an improved cardiac function and a reduced risk of sudden cardiac death.
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Heart Failure VI: Adjunct Therapies
Cardiomyopathy II: Dilated Cardiomyopathy
Heart Failure V: Medical Management
Cardiomyopathy V: Interprofessional Care
Cardiopulmonary Resuscitation III: AED Use
Dysrhythmias VI: Management of Dysrhythmias

