GOPAL DAS, M.D.
To the editor: I write to point out an error in a statement made by Dr. J. K. Perloff (1) in "Noninvasive Assessment of Myocardial Function." Using the left ventricular end-diastolic and end-systolic diameters measured from M-mode echocardiogram, he states "Stroke volume (SV) is the difference between left ventricular end-diastolic (EDV) and end-systolic volumes (ESV): SV = EDV - ESV, derived from [left ventricular end-diastolic dimensions]3 - [left ventricular end-systolic dimensions]3, or preferably [Δ left ventricular dimensions]3." Mathematically, assigning A to end-diastolic and B to end-systolic diameter, it implies that A3 - B3 = (A - B)3. Algebraically, (A -
DAS G. Correction: Error in "Noninvasive Assessment of Myocardial Function". Ann Intern Med. ;92:723. doi: 10.7326/0003-4819-92-5-723_1
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Published: Ann Intern Med. 1980;92(5):723.
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