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Illustration of acceptable and unacceptable quality M-mode echocardiograms. A, Example of M-mode strip-chart recording in which septal and free wall LV endocardium, as well as posterior wall epicardium, are well defined, enabling tracing analysis. B, Marginally inadequate recording that was rejected in which septal endocardium is inadequately defined in beats A and B and free wall endocardium is inadequately defined in beats B and C.
