The Flow Rate in Patients With Low-Gradient Aortic Stenosis

Area of Science:

• Cardiology
• Echocardiography
• Clinical Outcomes

Background:

• Assessing low-gradient aortic stenosis severity and intervention timing is challenging.
• Novel flow rate measurements offer a new approach to evaluate aortic stenosis.
• Understanding flow status is crucial for patient prognosis.

Purpose of the Study:

• To investigate the link between flow status in low-gradient aortic stenosis and three-year mortality.
• To determine if flow rate is a predictor of mortality in this patient group.
• To compare the prognostic value of flow rate versus stroke volume index.

Main Methods:

• Retrospective analysis of 29 patients with low-gradient aortic stenosis (valve area ≤ 1 cm²) from 2010-2015.
• Calculation of aortic valve flow rate and scrutiny of echocardiographic parameters.
• Correlation of these parameters with three-year mortality.

Main Results:

• Decreased aortic valve flow rate (< 210 ml/s) was an independent predictor of three-year mortality (66.7% mortality).
• Low stroke volume index (< 35 ml/m²) did not correlate with three-year mortality.
• Potential reasons for stroke volume index discrepancy include smaller body size in older female patients.

Conclusions:

• Aortic valve flow rate is a more significant prognostic indicator than stroke volume index in older patients with low-gradient aortic stenosis.
• Flow rate can better reflect flow status and predict mortality in this cohort.
• Further validation in larger populations and investigation of early intervention are needed.