Abnormalities in aortic properties: a potential link between left ventricular diastolic function and...

Area of Science:

• Cardiovascular Medicine
• Hematology
• Medical Imaging

Background:

• Left ventricular (LV) diastolic dysfunction in sickle cell disease (SCD) is a significant predictor of mortality.
• The underlying mechanisms of diastolic dysfunction in SCD remain poorly understood, hindering therapeutic development.

Purpose of the Study:

• To investigate whether patients with SCD exhibit altered aortic properties, independent of blood pressure, that may contribute to diastolic dysfunction.
• To identify potential novel therapeutic targets for preventing or delaying diastolic dysfunction in SCD.

Main Methods:

• A comparative study involving 31 stable adult SCD patients and 12 healthy controls.
• Utilized echocardiography for LV diastolic function assessment and cardiovascular magnetic resonance (CMR) imaging for detailed aortic and LV analysis.
• CMR included velocity-encoded imaging to quantify aortic flow dynamics and distensibility.

Main Results:

• SCD patients demonstrated increased aortic diastolic area, global stroke volume, and both forward and backward blood flow compared to controls.
• Aortic distensibility and peripheral blood pressure were comparable between SCD patients and controls.
• Peak backward flow rate and volume effectively differentiated between SCD patients with and without diastolic dysfunction.

Conclusions:

• Altered aortic properties, specifically increased diastolic area and altered flow dynamics, are present in SCD patients, even with normal blood pressure.
• These aortic changes are associated with LV diastolic dysfunction in SCD.
• Targeting these aortic alterations presents a potential novel therapeutic strategy to mitigate diastolic dysfunction and improve clinical outcomes in SCD.