LA contractile phase was also impaired in HCM, which is somewhat inconsistent with previous reports that showed a trend toward increased LA contractile booster pump function in HCM with absent LV fibrosis (although not statistically significant). 2 This might be related to the fact that 87% of our HCM patients already presented with LGE on CMR, so LA contractile function might already be compromised.
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Atrial Mechanics in Hypertrophic Cardiomyopathy: Discriminating between Ventricular Hypertrophy and Fibrosis.
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