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The effect of vasodilator therapy on the limb circulation in hypertension
1Ist Clinic of Medicine, Semmelweis University Medical School, Budapest, Hungary.
Insights
Vasodilator drugs significantly improve limb circulation and reduce vascular resistance in hypertensive patients with obliterative arterial disease. This therapy enhances blood flow, offering a potential benefit for this patient group.
Area of Science:
- Cardiovascular Pharmacology
- Vascular Physiology
Background:
- Hypertension is a significant risk factor for peripheral arterial disease.
- Obliterative arterial disease impairs limb blood flow and increases vascular resistance.
Purpose of the Study:
- To investigate the effects of vasodilator drugs on limb circulation in hypertensive patients.
- To assess the impact of vasodilators on limb blood flow and vascular resistance in patients with and without obliterative arterial disease.
Main Methods:
- Study included 59 hypertensive patients, 46 with obliterative arterial disease.
- Administered hydralazine, nitroglycerine, and sodium nitroprusside.
- Assessed limb blood flow using isotope dilution and calculated limb vascular resistance.
Main Results:
- Vasodilator therapy markedly increased limb blood flow and decreased vascular resistance in hypertensive patients with obliterative arterial disease.
- No significant difference was observed between the different vasodilators used.
- Normotensive patients with arterial disease showed a similar but less pronounced response.
- Abrupt blood pressure drops led to decreased limb blood flow and increased vascular resistance.
Conclusions:
- Vasodilator therapy effectively reduces limb vascular resistance in hypertensive patients with obliterative arterial disease.
- Improved limb circulation is a key outcome of vasodilator treatment in this population.
Abstract:
The effect of vasodilator drugs on limb circulation was investigated in 59 hypertensive patients. Forty-six of them suffered from obliterative arterial disease, too. The drugs administered were: hydralazine, nitroglycerine and sodium nitroprusside. Isotope dilution method was employed to assess limb blood flow before and after acute treatment. Limb vascular resistance was calculated from the limb blood flow and the mean blood pressure. A marked increase in limb blood flow and decrease in vascular resistance following vasodilator treatment were observed in hypertensive patients suffering from obliterative arterial disease. No difference was found between the various vasodilators investigated. Normotensive patients with arterial disease exhibited the same response to a lesser degree. In exceptional cases, where blood pressure dropped abruptly, limb blood flow decreased and limb vascular resistance increased. The data show that vasodilator therapy in hypertension results in diminished limb vascular resistance and improved limb circulation in patients with obliterative arterial disease.