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[Reactive hyperemia in hypertension]
1O. O. Bogomolets Institute of Physiology, National Academy of Sciences of Ukraine.
Fiziolohichnyi Zhurnal (Kiev, Ukraine : 1994)
|December 8, 1998
Summary
Endothelial dysfunction, indicated by reduced reactive hyperemia, worsens with the stage of hypertensive disease. This suggests reactive hyperemia can help diagnose vascular disease early.
Area of Science:
- Cardiovascular Medicine
- Vascular Biology
- Hypertension Research
Background:
- Hypertensive disease (HD) is a major risk factor for cardiovascular complications.
- Endothelial dysfunction is an early event in atherothrombosis and hypertension.
- Reactive hyperemia (RH) reflects endothelium-dependent vasodilation.
Purpose of the Study:
- To investigate alterations in endothelium-dependent reactive hyperemia (RH) in patients with hypertensive disease (HD).
- To determine if endothelial function is stage-dependent in hypertensive disease.
- To assess the utility of RH measurement for diagnosing vascular disease.
Main Methods:
- Forearm blood flow (FBF) was measured using impedance plethysmography in 35 mild HD (HDI), 38 severe HD (HDII) patients, and 41 healthy controls (C).
- FBF was assessed before and after a 30-second arterial occlusion to induce RH.
- Maximal increase in FBF during RH (FBFmax) was analyzed to evaluate endothelial function.
Main Results:
- Resting FBF was comparable across all groups (HDI, HDII, C).
- Maximal FBF during RH was significantly reduced in HD patients compared to healthy controls.
- A statistically significant difference in FBFmax was observed between HDI and HDII, indicating stage-dependent endothelial dysfunction.
Conclusions:
- Hypertensive disease is associated with stage-dependent endothelial dysfunction.
- Reduced RH indicates impaired endothelial function in hypertensive patients.
- RH measurement is a potential clinical tool for early and differential diagnosis of vascular disease.