Low flow, low gradient aortic stenosis (LFLGAS) can be diagnosed if certain features are present. LFLGAS is associated with a worse prognosis as compared to aortic stenosis with normal flow.
Criteria for LFLGAS:
(1) aortic valve area <= 1.0 square cm
(2) (resting mean gradient < 40 mm Hg) OR (peak velocity < 4.0 m/s)
LFLGAS is associated with a low stroke volume index (< 35 mL per square meter BSA).
It may be further classified based on the left ventricular ejection fraction (LVEF).
LVEF
Term
reduced
classical
preserved
paradoxical
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