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Subendocardial blood flow in children with congenital aortic stenosis

L J Krovetz, J P Kurlinski

    Circulation
    |December 1, 1976
    PubMed

    Insights

    Subendocardial flow index (SEFI) effectively measures blood flow in children with aortic stenosis, proving more reliable than aortic valve area after surgery, especially when regurgitation is present.

    Area of Science:

    • Cardiology
    • Pediatric Cardiology
    • Cardiovascular Physiology

    Background:

    • Subendocardial blood flow is crucial for myocardial health.
    • Estimating subendocardial blood flow and oxygen consumption is vital for assessing cardiac function.
    • Diastolic pressure time index and tension time index are used to estimate these parameters.

    Purpose of the Study:

    • To evaluate the utility of the subendocardial flow index (SEFI) in children with aortic stenosis.
    • To compare SEFI with traditional measures like aortic valve area (AVA) and systolic pressure difference (SPD).
    • To determine the effectiveness of SEFI as an indicator of surgical success post-valvotomy.

    Main Methods:

    • Calculation of subendocardial flow index (SEFI) using diastolic pressure time index and tension time index.
    • Measurement of aortic valve area (AVA) and systolic pressure difference (SPD).
    • Assessment of SEFI, AVA, and SPD in children with normal aortic valves, asymptomatic aortic stenosis, and symptomatic aortic stenosis before and after surgery.

    Main Results:

    • SEFI was lower in children with aortic stenosis compared to those with normal valves.
    • SEFI did not correlate well with symptoms in symptomatic children.
    • Both SEFI and AVA increased post-surgery, but SEFI remained a reliable indicator even with post-operative aortic regurgitation.

    Conclusions:

    • Subendocardial flow index (SEFI) is a valuable tool for assessing myocardial blood flow in pediatric aortic stenosis.
    • SEFI is a more robust measure of surgical success than aortic valve area, particularly when aortic regurgitation is present post-valvotomy.

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