Abstract
Background
Cardiac resynchronization therapy (CRT) reduces morbidity and mortality in chronic systolic heart failure. About 20% of implanted patients are considered as “non-responders”. This study aimed to evaluate gated myocardial perfusion single-photon emission computed tomography (GMPS) phase parameters as compared to echocardiography in the assessment of predictors for response to CRT before and after CRT activation.
Methods
Forty-two patients were prospectively included during 15 months. A single injection of 99mTc-tetrofosmin was used to acquire GMPS phase pre- and post-CRT activation. Indicators of positive CRT response were improvement of functional status and 15% reduction in left ventricular end-systolic volume at 3 months.
Results
Phase parameters at baseline were similar in the two groups with no influence of perfusion data. Phase parameters after CRT activation were significantly improved in the responders’ group (Δ Bandwidth −19° ± 24° vs. 13° ± 31°, p = 0.001; Δ SD −20° ± 30° vs. 26° ± 46°, p = 0.001; Δ Entropy −11 ± 12 vs. 2 ± 6%, p = 0.001). Feasibility and reproducibility were higher for GMPS.
Conclusion
Acute phase modifications after CRT activation may predict response to CRT immediately after implantation, but not at baseline, even when adjusted to perfusion data.
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Abbreviations
- β:
-
Bandwidth
- Ә:
-
Entropy
- ε :
-
Strain
- CRT:
-
Cardiac resynchronization therapy
- GMPS:
-
Gated myocardial perfusion SPECT
- HF:
-
Heart failure
- ICC:
-
Intraclass correlation
- ICM:
-
Ischemic cardiomyopathy
- IVMD:
-
Interventricular mechanical delay
- LLWC:
-
Left lateral wall contraction
- LV:
-
Left ventricle
- LVEF:
-
Left ventricular ejection fraction
- LVEDV:
-
Left ventricular end-diastolic volume
- LVESV:
-
Left ventricular end-systolic volume
- LVFT:
-
Left ventricular filling time
- LWMP:
-
Lateral wall myocardial perfusion
- NYHA:
-
New York Heart Association
- TTE:
-
Trans-thoracic echocardiography
- SD:
-
Standard deviation
- SPECT:
-
Single-photon emission computed tomography
- SPWMD:
-
Septal-posterior wall motion delay
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Gendre, R., Lairez, O., Mondoly, P. et al. Research of predictive factors for cardiac resynchronization therapy: a prospective study comparing data from phase-analysis of gated myocardial perfusion single-photon computed tomography and echocardiography. Ann Nucl Med 31, 218–226 (2017). https://doi.org/10.1007/s12149-017-1148-5
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DOI: https://doi.org/10.1007/s12149-017-1148-5