The Relationship Between Cardiothoracic Ratio and Left Ventricular Ejection Fraction in Congestive Heart Failure

Abstract
MEASURES OF left ventricular contractile function, including ejection fraction (EF), are relevant to diagnosis,1-4 prognosis,3-11 and treatment1-4,7,11 in patients with congestive heart failure (CHF). The EF is inversely related to mortality,3-11 and is perhaps the best prognostic index in heart failure. Thus, experts recommend that left ventricular systolic function be determined in patients with CHF.3,12,13 Although EF can be readily measured using angiographic, radionuclide, or echocardiographic techniques, these tests are expensive and may not be readily available in all clinical settings. A simple, convenient, noninvasive, and inexpensive method of accurately estimating left ventricular EF would be of great value in such patients.

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