Recommendations for surgical treatment of AS
Recommendation	Grade of recommendation	Level of evidence
Symptomatic patients with severe AS	I	B
Asymptomatic patients with severe AS and LVEF < 50%	I	B
Patients with severe AS scheduled to undergo other cardiac surgeries	I	B
Asymptomatic patients with very severe AS (transvalvular jet velocity ≥ 5.0 m/s) and low surgical risk	IIa	B
Asymptomatic patients with severe AS and diminished exercise tolerance or	IIa	B
effort hypotension	IIa	C
Patients with moderate AS scheduled to undergo other cardiac surgeries	IIb	C

AS: aortic stenosis; LVEF: left ventricular ejection fraction.