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Related Experiment Videos

Abnormal Peripheral Vasodilatory Reserve Without Endothelial Dysfunction in Patients With Aortic Dissection.

Makita1, Nakamura, Ohira

  • 1Department of Internal Medicine II, Iwate Medical University, Morioka, Japan

The International Journal of Angiology : Official Publication of the International College of Angiology, Inc
|April 12, 2000
PubMed
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Peripheral arterial stiffness is altered in patients with aortic dissection (AD). Reactive hyperemia, a measure of arterial structure, was impaired in AD patients, suggesting structural abnormalities rather than endothelial dysfunction.

Area of Science:

  • Cardiovascular Medicine
  • Vascular Biology
  • Arterial Physiology

Background:

  • Aortic dissection (AD) is associated with aortic wall structural changes.
  • Peripheral arterial stiffness influences central aortic pressure via wave reflection.
  • Peripheral vasomotion characteristics in AD remain under-investigated.

Purpose of the Study:

  • To investigate endothelium-dependent peripheral vasodilation in AD patients.
  • To assess the reactive hyperemic response in AD patients.
  • To explore alterations in peripheral resistance artery structure in AD.

Main Methods:

  • Forearm blood flow (FBF) was measured plethysmographically.
  • Intra-arterial infusions of acetylcholine (ACh) and sodium nitroprusside (SNP) were used.

Related Experiment Videos

  • Occlusion-induced reactive hyperemia (RH) was assessed in AD patients, healthy volunteers, and uncomplicated hypertension (UHT) patients.

    • Main Results:

    • No significant differences in FBF response to ACh and SNP were observed between groups.
    • Peak FBF and maximum conductance during RH were significantly lower in AD patients compared to controls (p < 0.01 and p < 0.05).
    • Reactive hyperemic vasodilatory reserve was significantly impaired in AD patients.

    Conclusions:

    • Peripheral vasodilatory function (endothelium and smooth muscle) is not significantly different in AD patients compared to controls.
    • Impaired reactive hyperemia suggests arterial structural abnormalities in AD patients.
    • These structural changes may negatively impact post-onset aortic conditions in AD.