STROKE VOLUME DETERMINED FLOW RESERVE DOES NOT PREDICT THE TRUE SEVERITY OF LOW-FLOW LOW-GRADIENT AORTIC STENOSIS AND IS NOT A ROBUST MARKER OF CONTRACTILE RESERVE IN PATIENTS UNDERGOING LOW-DOSE DOBUTAMINE ECHOCARDIOGRAPHY
2017
Background: During low-dose dobutamine stress echocardiography in low-flow low-gradient aortic stenosis (LFLGAS), both the aortic stenosis severity and the presence of contractile reserve are conventionally assessed based on stroke volume flow reserve (SVFR) (stroke volume increase ≥20%). However
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