Abstract
Objectives
Hypertrophic cardiomyopathy (HCM) patients are closely related to LA functional impairment. Left atrial (LA) strain provides more insight into LA function. The study aimed to investigate the left atrial dysfunction of HCM patients by rapid semi-automatic method and determine the predictive value of left atrial long-axis strain (LAS) for atrial fibrillation (AF).
Methods
We enrolled 372 HCM patients and 100 healthy participants to assess the LA functional parameters. LAS was obtained by semi-automated tracking of the distance between the mid-posterior point of LA wall which is defined as the intersection of the LA long axis and the posterior wall, and the origins of the mitral valve. The inferior and anterior mitral valve annular insertion points on the 2-chamber view and the lateral and septal insertion points on the 4-chamber view were chosen as the origins of the mitral valve. The clinical outcome was defined as detecting the onset of AF.
Results
The LA strain values were analyzed as 20.8 ± 7.48% for εs, 9.81 ± 5.09% for εe, and 10.91 ± 4.24% for εa in HCM patients, which decreased significantly compared with normal controls. Significant correlations were detected between LV functional parameters and LA strain. During a median follow-up of 61 months, 44 (11.8%) patients developed AF. In the Cox regression analysis, LA strain was identified as a significant predictor of the onset of AF.
Conclusions
HCM patients had impairment of LA strain before LA enlargement and reduced EF. LA-LAS can be used as a predictive value for predicting the occurrence of AF in HCM patients.
Key points
• Fast semi-automated long-axis strain analysis by CMR is feasible and effective for evaluating the LA longitudinal function.
• Hypertrophic cardiomyopathy patients show significant impairment of left atrial strain before LA enlargement.
• The left atrial long-axis strain was an independent predictor of atrial fibrillation in hypertrophic cardiomyopathy.
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Abbreviations
- AF:
-
Atrial fibrillation
- CMR:
-
Cardiovascular magnetic resonance
- EF:
-
Ejection fraction
- FT-CMR:
-
Feature-tracking cardiovascular magnetic resonance
- HCM:
-
Hypertrophic cardiomyopathy
- LA:
-
Left atrial
- LAS:
-
Long-axis strain
- LGE:
-
Late gadolinium enhancement
- LVH:
-
Left ventricular hypertrophy
- LVWT:
-
LV wall thickness
- STE:
-
Speckle-tracking echocardiography
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The scientific guarantor of this publication is Yucheng Chen.
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Pu, L., Diao, Y., Wang, J. et al. The predictive value of fast semi-automated left atrial long-axis strain analysis for atrial fibrillation in hypertrophic cardiomyopathy. Eur Radiol 33, 312–320 (2023). https://doi.org/10.1007/s00330-022-09020-x
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DOI: https://doi.org/10.1007/s00330-022-09020-x