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Non-Response to Cardiac Resynchronization Therapy (CRT)

Heart failure patients who do not show clinical or echocardiographic response to CRT.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

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What is Non-Response to Cardiac Resynchronization Therapy (CRT)?

Cardiac resynchronization therapy (CRT) improves symptoms and survival in advanced heart failure patients with LBBB by correcting ventricular dyssynchrony. However, about 30% of patients do not respond as expected — so-called 'non-responders' or CRT non-response.

Main causes of non-response include suboptimal lead placement, non-optimized AV and VV intervals, a low biventricular pacing percentage (often due to atrial fibrillation), extensive myocardial scar and inappropriate patient selection.

Diagnosis is based on clinical assessment (unchanged NYHA class), echocardiography (no change in LVEF or end-systolic volume) and continued hospital admissions. Treatment includes individualized AV optimization, lead revision, additional medical therapy and, in selected cases, advanced heart failure treatments.

Symptoms

Persistent dyspnea
No improvement in exercise capacity
Recurrent heart failure episodes
Persistent leg edema
Fatigue
Continued hospital admissions
No improvement in quality of life

Risk Factors

Ischemic cardiomyopathy
Extensive myocardial scar
Atrial fibrillation
Suboptimal lead placement
Narrow QRS complex
Right bundle branch block
Advanced heart failure

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • No symptom improvement after CRT
  • Recurrent hospitalizations
  • No echocardiographic improvement
  • New-onset atrial fibrillation
  • Inadequate biventricular pacing on device check
  • Development of arrhythmia

Treatment Methods

01
AV and VV interval optimization
02
Review of left ventricular lead position
03
Atrial fibrillation control or ablation
04
Optimization of medical therapy (ACE, beta-blocker, MRA, SGLT2)
05
Multipoint pacing
06
Advanced heart failure therapies (LVAD, transplant evaluation)
07
Regular follow-up and device programming

Which Department to Visit?

You can visit our Kardiyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.