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Systolic contraction of obliquely oriented cardiac myofibers results in a twisting motion (torsion) of the LV. The total torsion, Θ T , is defined as the difference in twisting between the base and apex. We hypothesized that measurements of torsion could be used to differentiate normal from abnormal patterns of regional contractile function. Accordingly, we compared Θ T in 6 patients...
To define the physiologic pattern of regional intramural contractile function, 10 healthy volunteers (5 F, 5 M, 21-41 y) were studied with tagged cine MRI to assess systolic deformation (strain). Tagged images were acquired at 6 short axis (SA) levels. λ1, the maximum principal strain, (tissue lengthening) was oriented primarily in the radial direction. λ2, the minimum principal strain, (shortening)...
Right ventricular myocardial motion has previously been studied with implanted radiopaque markers in animals, but little is known about human RV myocardial motion. Tagged cine MRI was used to define RV motion in 9 normal volunteers (22-30 yrs). The RV was imaged at basal, midventricular, and apical short axis (SA) levels. Percent tissue segmental shortening was measured at equally spaced intervals...
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