No abstract available.
Headache ; Vasoconstriction

No abstract available.
Anemia ; Stroke ; Vasoconstriction

No abstract available.
Corpus Callosum ; Hemorrhage ; Vasoconstriction

No abstract available.
Cerebral Angiography ; Headache Disorders, Primary ; Vasoconstriction*

BACKGROUND: Thoracoscopic T2 sympathicotomy is an effective method for the treatment of palmar hyperhidrosis. Not only are the symptoms of hyperhidrosis abolished but also the temperature of the ipsilateral palm is elevated due to the sympatholytic vasodilation after the completion of the sympathicotomy on the first side. However little is known about the temperature changes in the contralateral palm. This study was performed to evaluate the changes in both palmar temperatures during the thoracoscopic T2 sympathicotomy for palmar hyperhidrosis. MATERIAL AND METHOD: Thoracoscopic T2 sympathicotomy was performed in 15 patients with primary palmar hyperhidrosis. Surface temperatures of both palms were monitored continuously and were recorded simultaneously during the 7 different stages of the operation. RESULT: When T2 sympathicotomy was performed on the first(left) side, an ipsilateral increase with a contralateral decrease of temperature was observed. The difference in the temperature of both palms was greatest just before the sympathicotomy on the contralateral(right) side(Lt. 34.6+/-0.9degree C vs. Rt. 31.6+/-1.3degree C, p<0.0001). After the sympathicotomy on the second(right) side, temperature of the right palm was elevated. The difference in the temperature of both palms was abolished at the end of the operation(Lt.34.7+/-0.9degree C vs. Rt.34.4+/-1.0degree C, P=0.415). CONCLUSION: When T2 sympathicotomy was performed on the first side, an ipsilateral palmar temperature increased due to the sympatholytic vasodilation. However contralateral palmar temperature decreased due to a vasoconstriction. Although the mechanism of vasoconstriction is still unknown, it is postulated that there may be a cross- inhibitory effect by the post-ganglionic neurons innervating blood vessels of the palm.
Blood Vessels ; Humans ; Hyperhidrosis* ; Neurons ; Vasoconstriction ; Vasodilation

No abstract available.
Cerebral Angiography ; Headache ; Humans ; Migraine Disorders ; Vasoconstriction

Posterior reversible leukoencephalopathy syndrome (PRLS) is a disorder that is characterized by reversible white-matter edema affecting the posterior regions of the brain. There are rare cases in which cyclosporine has been cited as a medication responsible for PRLS, which causes hypoperfused ischemia by endothelial injury and vasoconstriction, with resultant vasogenic edema. A PRLS patient in whom the condition was induced by cyclosporine is described herein. Perfusion computed tomography revealed a clinically relevant hypoperfused area, including the zones of vasogenic edema.
Brain ; Cyclosporine ; Edema ; Humans ; Ischemia ; Leukoencephalopathies* ; Perfusion* ; Vasoconstriction

In this study, we evaluated systemic and pulmonary hemodynamic changes with the administration of diltiazem into pulmonary artery in hypoxia(F1O2 0.15)-induced pulmonary vasoconstriction in 7 mongrel dogs. Hypoxic gas induced pulmonary vasoconstriction(HPV) resulted in 23.8% increase of mean pulmonary arterial pressure(PAP) without any changes of pulmonary vascular resistance(PVR). A 200 ug/kg intravenous bolus of diltazem, followed by 10 ug/kg/min(DL)and 15 ug/kg/min(DH) for 20 min, respectively, produced no change in pulmonary arterial pressure. But this was accompanied by increase in PVR and PVR/SVR ration in DL and 20 min after DH. We conclude that diltiazem does not seem to decrease acute hypoxic pulmonary vasoconstrition in dogs and it might not be beneficial drug for this kind of pulmoary hypertension.
Animals ; Arterial Pressure ; Diltiazem* ; Dogs* ; Hemodynamics ; Hypertension ; Pulmonary Artery ; Vasoconstriction*

In this study, we evaluated systemic and pulmonary hemodynamic changes with the administration of diltiazem into pulmonary artery in hypoxia(F1O2 0.15)-induced pulmonary vasoconstriction in 7 mongrel dogs. Hypoxic gas induced pulmonary vasoconstriction(HPV) resulted in 23.8% increase of mean pulmonary arterial pressure(PAP) without any changes of pulmonary vascular resistance(PVR). A 200 ug/kg intravenous bolus of diltazem, followed by 10 ug/kg/min(DL)and 15 ug/kg/min(DH) for 20 min, respectively, produced no change in pulmonary arterial pressure. But this was accompanied by increase in PVR and PVR/SVR ration in DL and 20 min after DH. We conclude that diltiazem does not seem to decrease acute hypoxic pulmonary vasoconstrition in dogs and it might not be beneficial drug for this kind of pulmoary hypertension.
Animals ; Arterial Pressure ; Diltiazem* ; Dogs* ; Hemodynamics ; Hypertension ; Pulmonary Artery ; Vasoconstriction*

BACKGROUND: Among the various physiochemical stimuli, hypoxia has been known to cause coronary vasodilation. In contrast to this, endothelial dependent contracting factor(EDCF) was shown to be secreted by hypoxia and overall physiological roles of these apparently contradicting two phenomena are not clear. Although coronary vasodilation is dominant in epicardial coronary artery by hypoxia, collateral circulation may show different response from epicardial coronary artery to the same stimulus and effect of hypoxia on the vasomotor tone of collateral vessels has not been established. METHODS: Left circumflex coronary artery was chronically occluded using Ameriod occluder in the canine model and myocardial blood flow through collateral circulation was measured using microsphere during induced regional hypoxia. RESULTS: 1) Myocardial blood flow measurements during oxygenated and hypoxic solution infusion were 1.11+/-0.11 mg/min/g and 1.12+/-0.10 ml/min/g respectively in normal perfused zone(LAD territory), but in the collateral dependent zone(LCX territory) blood flow decreased significantly during hypoxic solution infusion(0.55+/-0.17 ml/min/g vs 0.43+/-0.21 ml/min/g)(p<0.05). Also myocardial blood flow ratio(LCX/LAD territory) decreased significantly during hypoxic solution infusion(0.49+/-0.16 vs 0.39+/-0.02)(p<0.05). 2) In collateral dependent zone, endocardial and epicardial blood flow ratio showed significant redistribution during hypoxic solution infusion. 3) After verapamil administration, myocardial blood flow in collateral dependent zone increased from 0.43+/-0.21ml/mg/g to 0.56+/-0.23 ml/mg/g(p<0.05). Also myocardial blood flow ratio(LCX/LAD territory) increased from 0.39+/-0.20 to 0.50+/-0.20 to 0.50+/-0.21 after verapamil administration. CONCLUSION: Hypoxia seems to cause vasoconstriction in collateral vessels and redistribution of blood flow in collateral dependent zone and these effects can be reversed by verapamil.
Anoxia* ; Collateral Circulation* ; Coronary Vessels ; Microspheres ; Oxygen ; Vasoconstriction ; Vasodilation ; Verapamil