Myocardial Acceleration During Isovolumic Contraction
نویسندگان
چکیده
منابع مشابه
Myocardial acceleration during isovolumic contraction: relationship to contractility.
BACKGROUND Acceleration of the mitral ring during isovolumic contraction has been proposed as a load-independent index of global left ventricular (LV) contractility. This study investigates whether myocardial isovolumic acceleration (IVA) reflects regional contractility. METHODS AND RESULTS In acutely instrumented, anesthetized dogs, we measured LV pressure, myocardial long-axis velocities, a...
متن کاملTransmural myocardial mechanics during isovolumic contraction.
OBJECTIVES We sought to resolve the 3-dimensional transmural heterogeneity in myocardial mechanics observed during the isovolumic contraction (IC) phase. BACKGROUND Although myocardial deformation during IC is expected to be little, recent tissue Doppler imaging studies suggest dynamic myocardial motions during this phase with biphasic longitudinal tissue velocities in left ventricular (LV) l...
متن کاملEarly detection of right ventricular systolic dysfunction by using myocardial acceleration during isovolumic contraction in patients with mitral stenosis.
AIM The aim of the study was to determine if the tissue Doppler imaging (TDI)-derived myocardial acceleration during isovolumic contraction (IVA) of tricuspid lateral annulus could be used in early detection of RV systolic dysfunction in patients with mitral stenosis (MS), before the clinical signs of systemic venous congestion occur. METHODS One hundred and twelve patients with rheumatic MS ...
متن کاملQuantitative assessment of regional peak myocardial acceleration during isovolumic contraction and relaxation times by tissue Doppler imaging.
OBJECTIVE To examine regional wall acceleration and its relation to relaxation. STUDY DESIGN 8 sheep were examined by tissue Doppler ultrasound imaging (VingMed Vivid FiVe) in apical four chamber views to evaluate the left ventricular wall divided into six segments and the mitral annulus in two segments. Peak myocardial acceleration during isovolumic periods (pIVA) derived from tissue Doppler...
متن کاملIsovolumic contraction acceleration before and after percutaneous closure of atrial septal defects
AIM To compare systemic right ventricular function by isovolumic myocardial acceleration before and 6 months after the percutaneous closure of atrial septal defects (ASD). MATERIAL AND METHODS Patients admitted to our tertiary center for the percutaneous closure of atrial septal defects between January 2010 and August 2012 constituted the study group. Right ventricular function of patients wa...
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ژورنال
عنوان ژورنال: Circulation
سال: 2005
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.0000158432.86860.a6