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Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion

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Microvascular function is impaired in children with morbid obesity.

Oliver Schlager¹, Andrea Willfort-Ehringer, Alexandra Hammer

¹Department of Angiology, Vienna Medical University, Vienna, Austria.

Vascular Medicine (London, England)

|March 12, 2011

Summary

Morbid obesity in children may impair microvascular function, showing higher peak blood flow and longer recovery times. This suggests early-stage vascular dysfunction in obese youth.

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Area of Science:

Pediatric Endocrinology
Cardiovascular Physiology
Vascular Biology

Background:

Childhood obesity is a significant public health concern in Western societies.
Early detection of health complications in obese children is crucial.
Morbid obesity may impact microvascular function even at early stages.

Purpose of the Study:

To investigate microvascular function in children with morbid obesity.
To compare microvascular responses between obese children and healthy controls.

Main Methods:

Assessed microvascular function using post-occlusive reactive hyperemia measured by laser Doppler.
Measured parameters included baseline perfusion, peak perfusion, and recovery time.
Compared data from 41 obese children (BMI > 99.5th percentile) with 91 healthy controls.

Main Results:

Children with morbid obesity exhibited significantly higher peak perfusion compared to controls (1.67 ± 0.76 AU vs 1.26 ± 0.5 AU, p < 0.001).
Recovery time was significantly prolonged in obese children (118.21 ± 34.64 s) versus healthy children (83.18 ± 35.08 s, p < 0.001).

Conclusions:

Higher peak perfusion and prolonged recovery time indicate microvascular dysfunction in children with morbid obesity.
This dysfunction may stem from impaired vasoconstrictive ability of precapillary sphincters.
Findings suggest that morbid obesity affects microvascular function early in childhood.