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RESEARCH PRODUCT

Speckle myocardial imaging modalities for early detection of myocardial impairment in isolated left ventricular non-compaction

Charles J. BruceHector I. MichelenaDiego BellaviaGabriella VeressPatricia A. PellikkaHeidi M. ConnollyFletcher A. MillerMatthew W. MartinezJae K. OhHector R. Villarraga

subject

AdultMalemedicine.medical_specialtyDiastoleDoppler imagingechocardiography cardiomyopathy.ArticleVentricular Dysfunction LeftYoung AdultSpeckle patternInternal medicinemedicineHumansUltrasonographyObserver VariationIsolated Noncompaction of the Ventricular MyocardiumEjection fractionmedicine.diagnostic_testbusiness.industryArea under the curveReproducibility of ResultsStroke VolumeMagnetic resonance imagingStroke volumeMiddle AgedSettore MED/11 - Malattie Dell'Apparato CardiovascolareMagnetic Resonance ImagingCirculatory systemCardiologyFemaleCardiology and Cardiovascular MedicinebusinessFollow-Up Studies

description

Objective To examine the hypothesis that speckle myocardial imaging (SMI) modalities, including longitudinal, radial and circumferential systolic (s) and diastolic (d) myocardial velocity imaging, displacement (D), strain rate (SR) and strain (S), as well as left ventricular (LV) rotation/torsion are sensitive for detecting early myocardial dysfunction in isolated LV non-compaction (iLVNC). Design and results Twenty patients with iLVNC diagnosed by cardiac magnetic resonance (15) or echocardiography (5) were included. Patients were divided into two groups: ejection fraction (EF)>50% (n=10) and EF≤50% (n=10). Standard measures of systolic and diastolic function including pulsed wave tissue Doppler Imaging (PWTDI) were obtained. Longitudinal, radial and circumferential SMI, and LV rotation/torsion were compared with values for 20 age/sex-matched controls. EF, PWTDI E9, E/E9 and all of the SMI modalities were significantly abnormal for patients with EF≤50% compared with controls. In contrast, EF and PWTDI E9, E/E9 were not significantly different between controls and patients with iLVNC (EF>50%). However, SMI-derived longitudinal sS, sSR, sD and radial sS, as well as LV rotation/torsion values, were all reduced in iLVNC (EF>50%) compared with controls. Measurements with the highest discriminating power between iLVNC (EF>50%) and controls were longitudinal sS mean of the six apical segments (area under the curve (AUC)=0.94), sS global average (AUC=0.94), LV rotation apical mean (AUC=0.94); LV torsion (AUC=0.93) LV torsion rate (AUC=0.94). Conclusions LV SMI values are reduced in patients with iLVNC, even those with normal EF and PWTDI. The most accurate SMI modalities to discriminate between patients and controls are longitudinal sS mean of the six apical segments, LV apical rotation or LV torsion rate.

https://doi.org/10.1136/hrt.2009.182170