Assessment of subclinical left ventricular dysfunction in patients with chronic mitral regurgitation using torsional parameters described by tissue Doppler imaging.

Content Provider	Europe PMC
Author	Ojaghi-Haghighi, Zahra Mostafavi, Atoosa Moladoust, Hassan Noohi, Feridoun Maleki, Majid Esmaeilzadeh, Maryam Samiei, Niloofar
Copyright Year	2014
Abstract	AbstractBackground:Left ventricular (LV) twist is due to oppositely directed apical and basal rotation and has been proposed as a sensitive marker of LV function. We sought to assess the impact of chronic pure mitral regurgitation (MR) on the torsional mechanics of the left human ventricle using tissue Doppler imaging.Methods:Nineteen severe MR patients with a normal LV ejection fraction and 16 non-MR controls underwent conventional echocardiography and apical and basal short-axis color Doppler myocardial imaging (CDMI). LV rotation at the apical and basal short-axis levels was calculated from the averaged tangential velocities of the septal and lateral regions, corrected for the LV radius over time. LV twist was defined as the difference in LV rotation between the two levels, and the LV twist and twisting/untwisting rate profiles were analyzed throughout the cardiac cycle.Results:LV twist and LV torsion were significantly lower in the MR group than in the non-MR group (10.38° ± 4.04° vs. 13.95° ± 4.27°; p value = 0.020; and 1.29 ± 0.54 °/cm vs. 1.76 ± 0.56 °/cm; p value = 0.021, respectively), both suggesting incipient LV dysfunction in the MR group. Similarly, the untwisting rate was lower in the MR group (−79.74 ± 35.97 °/s vs.−110.96 ± 34.65 °/s; p value = 0.020), but there was statistically no significant difference in the LV twist rate.Conclusion:The evaluation of LV torsional parameters in MR patients with a normal LV ejection fraction suggests the potential role of these sensitive variables in assessing the early signs of ventricular dysfunction in asymptomatic patients.
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ISSN	17355370
Journal	The Journal of Tehran University Heart Center [J Tehran Heart Cent]
Volume Number	9
PubMed Central reference number	PMC4389196
Issue Number	2
PubMed reference number	25861323
e-ISSN	20082371
Language	English
Publisher	Tehran University of Medical Sciences
Publisher Date	2014-01-01
Access Restriction	Open
Rights License	This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly. Copyright© 2014 Tehran Heart Center, Tehran University of Medical Sciences
Subject Keyword	Elasticity imaging techniques Heart ventricles Mitral valve insufficiency
Content Type	Text
Resource Type	Article
Subject	Cardiology and Cardiovascular Medicine