Transthoracic Echocardiography Clinical Trial
Official title:
Reliability of Echocardiographic Assessment of Cardiac Dimensions and Function From Subcostal View
The purpose of this study is to assess reliability of echocardiographic assessment of ventricular dimensions and function from subcostal view.
Assessment of the function and dimensions of the right and left ventricles is a key part of
Point-of-Care ultrasound in critically ill patients. According to the recent guidelines, this
evaluation is performed from apical and parasternal views. However, these views may not be
clearly visible in the clinical setting of critical illness and subcostal view is often
preferred for its higher feasibility. Before clinical adoption, it is necessary to assess
whether the isolated examination from subcostal view is reliable enough in the detection of
the impairment of systolic function and the size of both ventricles and the investigators
decided to evaluate this issue.
Transverse and longitudinal dimensions and function of both ventricles will be measured
calculated by transthoracic echocardiography in critically ill patients in the intensive care
unit from parasternal and apical views following the recent guidelines. Systolic function of
the left ventricle will be expressed by the left ventricular ejection fraction (calculated by
biplane method of disc summation) and by the fraction shortening. Systolic function of the
right ventricle will be assessed by the tricuspid annular plane systolic excursion,
fractional area change, tricuspid lateral annular systolic velocity, and right ventricular
index of myocardial performance. From subcostal view, transverse dimensions of both
ventricles and novel parameters of systolic function (subcostal tricuspid annular plane
systolic excursion, right ventricular subcostal fraction shortening, right ventricular
modified subcostal fraction shortening, left ventricular subcostal fraction shortening and
left ventricular modified fraction shortening) will be measured.
Then, the reliability of parameters measured in subcostal view will be tested by comparison
with conventional parameters taken from apical and parasternal view by correlation analysis
and diagnostic test evaluation. The most reliable thresholds of parameters from subcostal
view will be calculated by receiver operating characteristic analysis.
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