Abstract
Speckle-tracking left ventricular global longitudinal strain (GLS) assessment may provide substantial prognostic information for hypertrophic cardiomyopathy (HCM) patients. Reference values for GLS have been recently published. We aimed to evaluate the prognostic value of standardized reference values for GLS in HCM patients. An analysis of HCM clinic patients who underwent GLS was performed. GLS was defined as normal (more negative or equal to −16 %) and abnormal (less negative than −16 %) based on recently published reference values. Patients were followed for a composite of events including heart failure hospitalization, sustained ventricular arrhythmia, and all-cause death. The power of GLS to predict outcomes was assessed relative to traditional clinical and echocardiographic variables present in HCM. 79 HCM patients were followed for a median of 22 months (interquartile range 9–30 months) after imaging. During follow-up, 15 patients (19 %) met the primary outcome. Abnormal GLS was the only echocardiographic variable independently predictive of the primary outcome [multivariate Hazard ratio 5.05 (95 % confidence interval 1.09–23.4, p = 0.038)]. When combined with traditional clinical variables, abnormal GLS remained independently predictive of the primary outcome [multivariate Hazard ratio 5.31 (95 % confidence interval 1.18–24, p = 0.030)]. In a model including the strongest clinical and echocardiographic predictors of the primary outcome, abnormal GLS demonstrated significant incremental benefit for risk stratification [net reclassification improvement 0.75 (95 % confidence interval 0.21–1.23, p < 0.0001)]. Abnormal GLS is an independent predictor of adverse outcomes in HCM patients. Standardized use of GLS may provide significant incremental value over traditional variables for risk stratification.
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Abbreviations
- CMR:
-
Cardiac magnetic resonance
- GLS:
-
Global longitudinal strain
- HCM:
-
Hypertrophic cardiomyopathy
- LAVI:
-
Left atrial volume index
- LV:
-
Left ventricle
- NSVT:
-
Non-sustained ventricular tachycardia
- NYHA:
-
New York Heart Association
- SRT:
-
Septal reduction therapy
- TTE:
-
Transthoracic echocardiography
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Hartlage, G.R., Kim, J.H., Strickland, P.T. et al. The prognostic value of standardized reference values for speckle-tracking global longitudinal strain in hypertrophic cardiomyopathy. Int J Cardiovasc Imaging 31, 557–565 (2015). https://doi.org/10.1007/s10554-015-0590-5
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DOI: https://doi.org/10.1007/s10554-015-0590-5