73 research outputs found
952-30 Left Ventricular Ejection Performance Improves Late After Aortic Valve Replacement in Patients with Aortic Stenosis and Reduced Ejection Fraction
To assess the time course and magnitude of change in left ventricular (LV) wall stress and ejection performance indices, 24 patients undergoing aortic valve replacement (AVR) for aortic stenosis were prospectively evaluated. Each patient underwent resting radionuclide angiography (RNA), echocardiography, and cardiac catheterization (high fidelity pressure) before AVR, then RNA and echocardiogram at one week and six months after AVR. Patients were stratified by preoperative ejection fraction (EF) into reduced EF (<50%) and normal EF (≥50%) groups.Pre-operatively, peak positive dp/dt was lower in the reduced EF group (1300 vs 1700mmHg/sec, p=0.035), and wall stress was elevated similarly in both groups (p=NS).Temporal Relationships of EF and Wall StressPre-op1 Week6 MosNormal EF (n=14)Mean Ejection Fraction (%)666468Mean Wall Stress (dyne/cm2×103)623444Reduced EF (n=10)Mean Ejection Fraction (%)383757Mean Wall Stress (dyne/cm2×103)785261Wall stress was reduced at one week post-operatively (p<0.005) in both groups. Ejection fraction remained depressed in the reduced EF group. By six months, however, EF had dramatically improved in the reduced EF group (p=0.002).ConclusionIn patients with LV dysfunction, EF remains low one week after AVR despite rectification of afterload mismatch. At six months, however, ejection performance improves. Therefore, when measured by ejection phase indices, the surgical benefit from AVR is not evident until late post-operatively
Usefulness of M-mode and cross-sectional echocardiography for analysis of right-sided heart disease
Value and limitations of computed tomography in assessing aortocoronary bypass graft patency.
The presence of a left bundle branch block contraction pattern evaluated by 2D strain is closely associated with long-term survival after cardiac resynchronization therapy
Left bundle branch block septal deformation by strain imaging predicts long-term survival after cardiac resynchronization therapy
Intravascular ultrasound evaluation of coronary and peripheral interventions technologies
Immediate mechanical effects of acute left bundle branch block by speckle tracked strain
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