Related Experiment Video
Updated: Aug 13, 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
[Cardiac resynchronization therapy: who is suitable? Who requires an additional ICD as a backup?]
H Volkmann1, C Bergmann, M Walter
1Erzgebirgsklinikum Annaberg, Postfach 10 02 54, 09456 Annaberg-Buchholz.
Insights
Cardiac resynchronization therapy (CRT) improves quality of life and reduces mortality in heart failure patients. However, the necessity of an implantable cardioverter-defibrillator (ICD) alongside CRT for all eligible patients remains under discussion.
Area of Science:
- Cardiology
- Medical Devices
Context:
- Congestive heart failure (CHF) patients with NYHA classes III-IV, reduced ventricular function, and left bundle branch block (LBBB) often benefit from CRT.
- CRT significantly improves quality of life and reduces mortality in these patients.
Purpose:
- To evaluate the prognostic benefits of combining CRT with an implantable cardioverter-defibrillator (ICD).
- To determine if all CRT-eligible patients require an ICD, considering mixed study outcomes.
Summary:
- CRT offers substantial benefits for specific heart failure patient groups, including improved cardiopulmonary stress management and reduced mortality.
- The addition of an ICD to CRT may further improve prognosis by reducing sudden cardiac death.
- Contradictory findings necessitate further discussion on the universal need for ICDs in all CRT candidates.
Impact:
- Provides clarity on the indications for ICD implantation in CRT patients.
- Aims to optimize patient selection for combined CRT-ICD therapy.
- Contributes to evidence-based guidelines for managing advanced heart failure and reducing sudden cardiac death.
Abstract:
Cardiac resynchronization therapy (CRT) has significant positive effects on the quality of life, enables patients to cope more efficiently with cardiopulmonary stress and leads to a reduction of total mortality in patients suffering from congestive heart failure NYHA classes III and IV, reduced ventricular function and left bundle branch block with a QRS complex wider than 150 ms. In a large number of patients suited for CRT, an additional defibrillator function seems to work out well concerning an additional prognostic improvement by means of reducing sudden cardiac death. Due to partially contradictory study outcomes, it still remains to be discussed whether all patients suited for CRT really need an ICD.
Related Concept Videos
Cardiomyopathy V: Interprofessional Care
Cardiomyopathy II: Dilated Cardiomyopathy
Heart Failure VI: Adjunct Therapies
Cardiopulmonary Resuscitation III: AED Use
Cardiomyopathy III: Hypertrophic Cardiomyopathy
Dysrhythmias VI: Management of Dysrhythmias
