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(Hypertension. 2008;52:279.)
© 2008 American Heart Association, Inc.

Original Articles

Marked Regional Left Ventricular Heterogeneity in Hypertensive Left Ventricular Hypertrophy Patients

A Losartan Intervention for Endpoint Reduction in Hypertension (LIFE) Cardiovascular Magnetic Resonance and Echocardiographic Substudy

Robert W.W. Biederman; Mark Doyle; Alistair A. Young; Richard B. Devereux; Eduardo Kortright; Gilbert Perry; Jonathan N. Bella; Suzanne Oparil; David Calhoun; Gerald M. Pohost; Louis J. Dell'Italia

From the Division of Cardiology, Department of Cardiovascular MRI, Gerald McGuiness Center, Allegheny General Hospital (R.W.W.B., M.D.), Pittsburgh, Pa; University of Auckland (A.A.Y.), New Zealand; Division of Cardiology (R.B.D.), Weill Cornell Medical College, New York, NY; ACTEK, Inc (E.K.), Birmingham, Ala; University of Alabama at Birmingham (G.P., S.O., D.C., L.J.D.); Bronx-Lebanon Hospital Center (J.N.B.), Bronx, NY; and the Division of Cardiology (G.M.P.), University of Southern California, Los Angeles.

Correspondence to Robert W.W. Biederman, Allegheny General Hospital, 320 E North Ave, Pittsburgh, PA 15212. E-mail rbiederm{at}wpahs.com

Concentric hypertensive left ventricular (LV) hypertrophy is presumed to be a symmetrical process. Using MRI-derived intramyocardial strain, we sought to determine whether segmental deformation was also symmetrical, as suggested by echocardiography. High echocardiographic LV relative wall thickness in hypertensive LV hypertrophy allows preserved endocardial excursion despite depressed LV midwall shortening (MWS). Depressed MWS is an adverse prognostic indicator, but whether this is related to global or regional myocardial depression is unknown. We prospectively compared MWS derived from linear echocardiographic dimensions with MR strain() in septal and posterior locations in 27 subjects with ECG LV hypertrophy in the Losartan Intervention for Endpoint Reduction in Hypertension Study. Although MRI-derived mass was higher in patients than in normal control subjects (124.0±38.6 versus 60.5±13.2g/m²; P<0.001), fractional shortening (30±5% versus 33±3%) and end-systolic stress (175±22 versus 146±28 g/cm²) did not differ between groups. However, mean MR() was decreased in patients versus normal control subjects (13.9±6.8% versus 22.4±3.5%), as was echo MWS (13.4±2.8% versus 18.2±1.4%; both P<0.001). For patients versus normal control subjects, posterior wall() was not different (17.8±7.1% versus 21.6±4.0%), whereas septal() was markedly depressed (10.1±6.6% versus 23.2±3.4%; P<0.001). Although global MWS by echocardiography or MRI is depressed in hypertensive LV hypertrophy, MRI tissue tagging demonstrates substantial regional intramyocardial strain() heterogeneity, with most severely depressed strain patterns in the septum. Although posterior wall 2D principal strain was inversely related to radius of curvature, septal strain was not, suggesting that factors other than afterload are responsible for pronounced myocardial strain heterogeneity in concentric hypertrophy.

Key Words: heart function • hypertension • hypertrophy • heart failure • radius of curvature • strain patterns