Left ventricular (LV) diastolic dysfunction is characterized by abnormal myocardial mechanical properties that include impaired diastolic distensibility, impaired LV filling, and slow or delayed myocardial relaxation. Diastolic dysfunction is an increasingly prevalent clinical problem that is a major cause of congestive heart failure. Diagnosing diastolic dysfunction remains difficult and controversial. Conventional echocardiographic techniques are limited in their ability to provide a global assessment of diastolic function. 3D magnetic resonance imaging (MRI) with tissue tagging provides a geometry independent measure of LV torsion/twist, which determines shortening and relaxation of the myocardium. Here we introduce a novel concept called 'Torsional Hysteresis'that provides a comprehensive global assessment of LV diastolic function. Contraction of myocardial bundles and their interaction with extracellular matrix during systole results in storage of torsional potential energy. Torsional recoil during isovolumic relaxation and early diastole releases the potential energy stored in the deformed matrix during systole and thus is also dependent on systolic function. We have found that the torsion hysteresis defined as the area within torsion- volume loop is increased in patients with hypertension with diastolic dysfunction and preserved systolic function compared to patients with highly compliant LV of isolated mitral regurgitation and normal controls. Moreover, we have found that torsional hysteresis is not altered in progressive mitral regurgitation with progressive systolic dysfunction in a canine model of mitral regurgitation or in mitral valve repair in humans with isolated mitral regurgitation and preserved systolic function. Thus, we hypothesize that torsional hysteresis calculated from a 3-dimensional MRI with tagging provides a measure of diastolic function that reflects the viscoelastic properties of the myocardium independent of load. We propose to test this hypothesis in normal subjects and in patients with suspected diastolic dysfunction.
Diastolic Dysfunction is an increasingly prevalent clinical problem that is a major cause of congestive heart failure. Accurate diagnosis of diastolic dysfunction using non-invasive tools remains a challenge. Here we have proposed a novel clinically relevant non-invasive parameter called torsional hysteresis for the global assessment of diastolic function.
|Li, Ming; Gupta, Himanshu; Lloyd, Steven G et al. (2017) A graph theoretic approach for computing 3D+time biventricular cardiac strain from tagged MRI data. Med Image Anal 35:46-57|
|Gupta, Himanshu; Schiros, Chun G; Sharifov, Oleg F et al. (2016) Impact of clinical input variable uncertainties on ten-year atherosclerotic cardiovascular disease risk using new pooled cohort equations. BMC Cardiovasc Disord 16:165|
|Sharifov, Oleg F; Schiros, Chun G; Aban, Inmaculada et al. (2016) Diagnostic Accuracy of Tissue Doppler Index E/e' for Evaluating Left Ventricular Filling Pressure and Diastolic Dysfunction/Heart Failure With Preserved Ejection Fraction: A Systematic Review and Meta-Analysis. J Am Heart Assoc 5:|
|Gupta, Himanshu (2016) Functional imaging for chest pain in the emergency room: To do or not to do? J Nucl Cardiol 23:298-300|
|Schiros, Chun G; Ahmed, Mustafa I; McGiffin, David C et al. (2015) Mitral Annular Kinetics, Left Atrial, and Left Ventricular Diastolic Function Post Mitral Valve Repair in Degenerative Mitral Regurgitation. Front Cardiovasc Med 2:31|
|Gupta, A; Schiros, C G; Gaddam, K K et al. (2015) Effect of spironolactone on diastolic function in hypertensive left ventricular hypertrophy. J Hum Hypertens 29:241-6|
|Zha, Wei; Schiros, Chun G; Reddy, Gautam et al. (2015) Improved Right Ventricular Performance with Increased Tricuspid Annular Excursion in Athlete's Heart. Front Cardiovasc Med 2:8|
|Wells, J Michael; Iyer, Anand S; Rahaghi, Farbod N et al. (2015) Pulmonary artery enlargement is associated with right ventricular dysfunction and loss of blood volume in small pulmonary vessels in chronic obstructive pulmonary disease. Circ Cardiovasc Imaging 8:|
|Schiros, Chun G; Desai, Ravi V; Venkatesh, Bharath Ambale et al. (2014) Left ventricular torsion shear angle volume analysis in patients with hypertension: a global approach for LV diastolic function. J Cardiovasc Magn Reson 16:70|
|Ahmed, Mustafa I; Desai, Ravi V; Gaddam, Krishna K et al. (2012) Relation of torsion and myocardial strains to LV ejection fraction in hypertension. JACC Cardiovasc Imaging 5:273-81|
Showing the most recent 10 out of 12 publications