No abstract available.
Chickenpox*

The authors performed prospectively the transcranial Doppler monitoring of bilateral anterior and middle cerebral arteries in 15 patients with ruptured cerebral aneurysm. The entry criteria for the study were confined to the patients who were admitted within 3 days after bleeding and had clinical grades of I, II, or III. The mean frequency shifts of bilateral anterior and middle cerebral arteries were increased immediately after ictus and showed continous further elevation between the 3rd and 8th rupture days. After that, they normalized slowly. The increase of frequency shift preceded clinical ischemic symptoms and an early steep increase of frequency shift was correlated to a high chance for suffering delayed ischemic deficits. The thick clots in subarachnoid cisterns shown on CT scans taken within the third rupture day were correlated well to the severe increase of frequency shifts. The aggressive treatment was done on asymptomatic patients who showed relatively rapid increase of frequency shifts, and they had shown no or trasient mild ischemic symptoms.
Hemorrhage ; Humans ; Intracranial Aneurysm* ; Middle Cerebral Artery ; Prospective Studies ; Rupture ; Tomography, X-Ray Computed

The effect of the calcium antagonist nimodipine on the feline cerebral cortical blood flow in experimentally induced subarachnoid hemorrhage(SAH) was studied. Cerebral cortical blood flow was measured in the middle cerebral territory at specified intervals by the hydrogen clearance method. SAH was induced in 25 cats by a slow injection of fresh autogenous arterial blood into the cisterna magna. Twenty-five cats were divided into 5 groups of 5 cats each according to the timing of the cerebral cortical blood flow measurements after SAH ; immediate(Group la, lb), 24 hours(Group 2), 48 hours(Group 3) and 7 days (Group 4). Cerebral cortical blood flow dereased by 55.5%, 39.2%, 41.4%, and 38.3% from pre-SAH levels in each group respectively. During nimodipine infusion(1 microgram/kg/min) cerebral cortical flow increased by 89.0%, 51.8%, 87.5% and 24.5% from pre-nimodipine infusion levels in each group respectively. Mean arterial blood pressure(MABP) after cisternal blood injection increased by 6.5% from pre-SAH levles, and MABP during nimodipine infusion decreased by 15.4% from pre-Nimodipine infusion levels. The calcium antagonist nimodipine increased cerebral cortical blood flow significantly in experimentally induced SAH without considerable changes of MABP. Results are considered promising for trials in the treatment and prevention of cerebral by vasospasm following SAH.
Animals ; Calcium* ; Cats ; Cisterna Magna ; Hydrogen ; Nimodipine* ; Subarachnoid Hemorrhage*

No abstract available.
Endocarditis* ; Humans

No abstract available.
Myasthenia Gravis* ; Pregnancy*

No abstract available.
Heart Septal Defects, Ventricular*

No abstract available.
Uterine Prolapse*

No abstract available.
Aortic Coarctation* ; Arm* ; Subclavian Artery*

OBJECTIVE: Nitric oxide and endothelin-1 are two endothelium derived relaxing and constricting factors probably involved in the pathogenesis of cerebral vasospasm after subarachnoid hemorrhage. The aim of this study is to ascertain the effects of nitric oxide donor(nitroglycerine) to reverse endothelin-1 induced cerebral vasoconstriction in vivo, when administered to the adventitial side of the basilar artery exposed through a transclival approach and common carotid artery exposed through a transcervical approach. METHODS: The exposed arteries were subjected to pharmacological manipulations and direct observation of the changes of their sizes under surgical microscope. Measurements of blood pressure, pulse rate and cerebral blood flow using thermal diffusion flowmetry during the drug infusion were done. RESULTS: 1) Nitroglycerine rapidly and completely reversed endothelin-1-induced vasoconstriction. The average value for maximal vasoconstriction by endothelin-1/synthetic cerebrospinal fluid was 58.3% of baseline arterial diameter and occurred within 30 minutes. 2) The nitroglycerine administered via adventitial side of the blood vessel was not associated with any changes in systemic blood pressure nor other vital signs. 3) Same changes occurred in the common carotid artery, although the severity of the occurrence and reversal of vasospasm were not significant compared to those of basilar artery. CONCLUSION: Intrathecally administered nitroglycerine was effective in reversing cerebral vasoconstriction without causing systemic hypotension. These findings provides the potential for the development of targeted therapy to reverse cerebral vasospasm after subarachnoid hemorrhage using nitric oxide donors.
Arteries ; Basilar Artery ; Blood Pressure ; Blood Vessels ; Carotid Artery, Common ; Cerebrospinal Fluid ; Endothelin-1* ; Endothelium ; Heart Rate ; Hypotension ; Nitric Oxide ; Nitric Oxide Donors ; Nitroglycerin* ; Rheology ; Subarachnoid Hemorrhage ; Thermal Diffusion ; Vasoconstriction ; Vasospasm, Intracranial ; Vital Signs

We reported a case of recurrent arteriovenous malformation, which had been operated on before and disappeared on postoperative angiography. Though a postoperative angiogram after the first operation indicated complete excision of the lesion, the patient returned with intracerebral hemorrhage, and an angiogram indicated reappearance of the lesion. Total excision was carried out at the second operation. It is concluded that long term follow-up angiography or vascular imaging procedures are required in particular cases of cerebral arteriovenous malformation with hematoma, difficulty in hemostasis and/or deep seated lesion.
Angiography* ; Arteriovenous Malformations ; Cerebral Hemorrhage ; Follow-Up Studies ; Hematoma ; Hemostasis ; Humans ; Intracranial Arteriovenous Malformations ; Recurrence*