Strain rate echocardiography uncovers subclinical left ventricular dysfunction in cystic fibrosis.

BACKGROUND

CFTR is expressed in cardiac myocytes. In mice, lack of CFTR alters cardiomyocyte contraction and Ca2+ signaling, and decreases cardiac reserve. We undertook a pilot study evaluating left ventricular (LV) function in CF patients using strain and strain rate echocardiography.

METHODS

Echocardiography with tissue Doppler and strain and strain rate imaging were performed in 8 CF adults following pulmonary function tests. Results were compared to literature values obtained in healthy subjects.

RESULTS

All CF individuals had normal LV ejection fractions. In contrast, 50% of men and 100% of women with CF had decreased LV systolic strain. Strain rates were significantly decreased in 100% of CF individuals. RV function was normal and LV function did not correlate with lung function.

CONCLUSIONS

Strain and strain rate echocardiography identified LV systolic abnormalities in CF individuals not detected by conventional echocardiography. We propose that this echocardiography modality may identify subclinical cardiac dysfunction in CF.