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Minimally Invasive Transverse Aortic Constriction in Mice

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[The results of the surgical treatment of aortic coarctation in nursing infants with a sharp decrease in left

A S Sharykin, V N Il'in, T V Rogova

Grudnaia I Serdechno-Sosudistaia Khirurgiia

|January 1, 1992

Summary

Early repair of coarctation of the aorta (CA) significantly improves left ventricular (LV) ejection fraction (EF) in infants. Prompt surgical intervention leads to better LV function recovery in infants operated on within the first three months of life.

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Area of Science:

Pediatric Cardiology
Cardiovascular Surgery
Echocardiography

Background:

Coarctation of the aorta (CA) significantly impacts left ventricular (LV) function, often presenting with reduced ejection fraction (EF) in infants.
LV fibroelastosis is an infrequent comorbidity in pediatric CA patients.

Purpose of the Study:

To evaluate the impact of CA correction on LV ejection fraction (EF) and volume in infants.
To determine the optimal timing for CA surgical repair to improve long-term LV function.

Main Methods:

Two-dimensional echocardiography was performed on 24 infants (14 days to 12 months) with CA and LV EF < 30%.
LV end-systolic volume and EF were assessed pre- and post-correction.
Patient outcomes were analyzed based on surgical timing (within vs. after 3 months of life).

Main Results:

Following CA correction, LV end-systolic volume decreased by 20% and EF increased 1.5-fold within 7 days, attributed to afterload reduction.
Long-term LV pumping function improved due to restored myocardial contractility.
Infants operated on within 3 months showed significantly better EF (68 +/- 3.8%) compared to those operated on later (50.8 +/- 2.5%).

Conclusions:

Surgical correction of CA rapidly improves LV systolic function by reducing afterload.
Early surgical intervention (within 3 months) in infants with CA leads to more favorable long-term LV functional recovery.
Compensatory hypertrophy and myocardial contractility are key factors in LV pumping function post-CA repair.