Left ventricular myocardial strain in ventricular arrhythmia without structural heart disease using cardiac magnetic resonance.

Ventricular arrhythmia (VA) in structurally normal heart is considered as benign. However, these arrhythmias have been recently reported to induce left ventricular (LV) dysfunction. Up to now, there is no efficacious method to detect abnormal myocardial systolic function in VA patients. Therefore, in the current study, we used cardiac magnetic resonance feature tracking (CMR-FT) on balanced steady state free precision (SSFP) cine images to investigate LV myocardial strain in 42 VA patients without known heart disease as well as in 29 normal volunteers. As compared with controls, VA patients had lower peak values of radial and circumferential strain (RS, CS) in both basal and middle parts of LV and the peak value of longitudinal strain (LS) in VA patients was also decreased in middle LV. Moreover, as revealed by LV myocardial segmental peak strain, reduced RS, CS and LS peaks in VA were more significant in anterior, inferoseptal and anterolateral segments, especially for the patients with frequent premature ventricular complexes. Our results suggested that VA in normal heart is associated with abnormal segmental wall motion, which can be efficaciously detected by CMR-FT derived strain analysis. And early clinical management should be considered to prevent further significant symptoms in these patients.