Low Ejection Fraction, Low-Flow, Low-Gradient Aortic Stenosis: Dobutamine Stress Echocardiographic Criteria to Assess Stenosis Severity

¹ IUCPQ, Quebec, QC,

² Ottawa Heart Institute, Ottawa, ON, Canada;

³ Mayo Clinic, Rochester, MN, USA;

⁴ Vienna General Hospital, Vienna, Austria;

⁵ Muenster general hospital, Muenster, Germany