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Aortic Stenosis - Current Perspectives [Working Title]
Hemodynamic classifications of aortic valve stenosis (AS) have important prognostic implications. In normal flow state, severe AS is defined as peak aortic velocity ≥ 4.0 m/s, mean transaortic gradient (MG) ≥ 40 mmHg, and aortic valve area (AVA) < 1.0 cm 2 . However, numerous studies have shown that severe AS (based on AVA < 1.0 cm 2 ) with low gradient (MG < 40 mmHg) is prevalent due to low flow state, in the setting of reduced and preserved left ventricular ejection fraction (LVEF). Thus, thedoi:10.5772/intechopen.86707 fatcat:lybwdy3yybgszdlii34xzrzfnq