AIMS: Patients with paradoxical low-flow severe aortic stenosis (PLF-AS) reportedly have higher left ventricular hydraulic load and more systolic strain dysfunction than patients with normal-flow aortic stenosis. This study investigates the relationship of systolic loading and strain to PLF-AS to further define its pathophysiology. METHODS: One hundred and twenty patients (age 79?±?12?years, 37% men) with an indexed aortic valve area (AVAi) of 0.6?cm/m or less and an ejection fraction of 50% or higher were divided into two groups based on indexed stroke volume (SVi): PLF-AS, SVi ≤ 35?ml/m, N?=?46; normal-flow aortic stenosis, SVi > 35?ml/m, N?=?74). Valvular and arterial load were assessed using multiple measurements, and strain was assessed using speckle-tracking echocardiography. RESULTS: Patients with PLF-AS were found to have more valvular load (lower AVAi, P?=?0.028; lower energy loss coefficient, P?=?0.001), more arterial load [decreased arterial compliance and increased systemic vascular resistance (SVR), both P?
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine