Cardiac resynchronization therapy indications
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Bhaskar Purushottam, M.D. [2], Hardik Patel, M.D.
Overview
Cardiac resynchronization therapy (CRT) with or without an implantable cardiac defibrillator (ICD) is indicated in patients who have an LVEF less than or equal to 35%, left bundle branch block (LBBB) with a QRS duration greater than or equal to 0.15 seconds, and normal sinus rhythm, for the treatment of NYHA functional Class III or ambulatory Class IV heart failure symptoms in patients whose medical therapy has been optimized.
Indications
2021 ESC Guideline for Cardiac Resynchronization Therapy implantation
Abbreviations:
AF: Atrial fibrillation;
A-V: Atrio-ventricular;
CRT: Cardiac resynchronization therapy ;
HFrEF: Heart failure with reduced ejection fraction;
ICD: Implantable cardioverter-defibrillato;
LBBB:Left bundle branch block;
LVEF: Left ventricular ejection fraction;
NYHA:New York Heart Association;
RV: = Right ventricular
| Recommendations for cardiac resynchronization therapy implantation in patients with heart failure |
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❑ CRT is recommended for symptomatic patients with HF in sinus rhythm with a QRS duration >_150 ms and LBBB QRS morphology and with LVEF <_35%
despite optimal medical therapy in order to improve symptoms and reduce morbidity and mortality |
| (Class IIa, Level of Evidence B): |
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❑ CRT should be considered for symptomatic patients with HF in sinus rhythm with a QRS duration >_150 ms and non-LBBB QRS morphology and
with LVEF <_35% despite OMT in order to improve symptoms and reduce morbidity and mortality |
| (Class IIb, Level of Evidence B) : |
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❑ CRT may be considered for symptomatic patients with HF in sinus rhythm with a QRS duration of 130-149 ms and non-LBBB QRS morphology and with LVEF <_35% despite optimal medical therapy in order to improve symptoms and reduce morbidity and mortality |
| (Class III, Level of Evidence A) : |
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❑CRT is not recommended in patients with a QRS duration <130 ms who do not have an indication for pacing due to high degree AV block |
| The above table adopted from 2021 ESC Guideline |
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Cardiac resynchronization therapy
- CRT reduces morbidity and mortality.
- CRT improves cardiac function, and enhances quality of life.
- Several characteristics predictors of improvement in morbidity and mortality including the extent of reverse remodelling as the most important mechanisms of action of CRT.
- Patients with HFrEF and ischemic etiology have less improvement in LV function due to myocardial scar tissue, which is less likely to undergo favorable remodelling.
- Women may be more likely to respond to CRT than men, possibly due to smaller body and heart size.
- QRS duration predicts CRT response.
- QRS morphology is related to a beneficial response to CRT.
- Patients with left bundle branch block (LBBB) morphology are more likely to respond favorably to CRT, whereas there is less certainty about patients with non-LBBB morphology.
- Patients with LBBB morphology often have wider QRS durations, and there is a current debate about whether QRS durations or QRS morphology is the
the main predictor of a beneficial response to CRT.
- there is little evidence to suggest that QRS morphology or etiology of disease influence the effect of CRT on morbidity or mortality.
- Implantation of CRT is not recommended if QRS duration is <130 ms.
- If a patient is scheduled to receive an ICD and is in sinus rhythm, with a LBBB, CRT-D should be considered if the QRS is between 130 and 149 ms and is recommended if QRS is >_150 ms.
- When LVEF is reduced, RV pacing may exacerbate cardiac dyssynchrony.
- This can be prevented by CRT, which might improve patient outcomes.
- CRT rather than RV pacing is recommended for patients with HFrEF regardless of NYHA class who have an indication for ventricular pacing in order to reduce morbidity, although no clear effect on mortality was observed.
- In patients with HFrEF who have received a conventional pacemaker or an ICD and subsequently develop worsening HF with a high proportion of RV pacing, CRT implantation is recommended.
- CRT is superior to RV pacing in patients undergoing atrioventricular (AV) node ablation.
- In patients with AF, CRT-D compared with ICD, was not benefit and less than half of patients had >90% biventricular capture.
- CRT in patients with AF may be an option in selected patients—particularly those with a QRS >_150 ms—ensuring a proportion of biventricular pacing as high as possible.
Observational studies report that when biventricular capture is <98%, the prognosis of patients with CRT declines.218,232 Whether this association reflects a loss of resynchronization (which might be remedied by device programming), poor placement of the LV lead
References
- ↑ McDonagh TA, Metra M, Adamo M, Gardner RS, Baumbach A, Böhm M, Burri H, Butler J, Čelutkienė J, Chioncel O, Cleland J, Coats A, Crespo-Leiro MG, Farmakis D, Gilard M, Heymans S, Hoes AW, Jaarsma T, Jankowska EA, Lainscak M, Lam C, Lyon AR, McMurray J, Mebazaa A, Mindham R, Muneretto C, Francesco Piepoli M, Price S, Rosano G, Ruschitzka F, Kathrine Skibelund A (September 2021). "2021 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure". Eur Heart J. 42 (36): 3599–3726. doi:10.1093/eurheartj/ehab368. PMID 34447992 Check
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