background: although the risk factors of ischemic strokes are well defined, there is slight information about their relations with the etiologies of ischemic strokes. this study investigated the distribution of ischemic stroke risk factors and their connections to diverse etiologies of cerebrovascular attack (cva) and specific ischemic regions of brain. methods: in this cross sectional study , ...

background: stroke is a multifactorial disorder, the most common cause being arterial occlusion. transcranial doppler ultrasonography (tcd) is a common non-invasive method available for assessment the arterial blood flow of the brain. objective: assessment the hemodynamic parameters of cerebral arteries, using tcd device in patients suffering ischemic stroke. materials and methods: this descrip...

BACKGROUND AND PURPOSE Diagnosis of Moyamoya disease (MMD) is based on the characteristic angiographic findings. However, differentiating MMD from intracranial atherosclerotic disease (ICAD) is difficult. We compared vessel wall imaging findings on high-resolution magnetic resonance imaging between MMD and ICAD. METHODS High-resolution magnetic resonance imaging was performed on 32 patients w...

Background and Purpose. In rat middle cerebral arteries, endothelium-dependent hyperpolarization (EDH) is mediated by activation of calcium-activated potassium (KCa) channels specifically KCa2.3 and KCa3.1. Lipoxygenase (LOX) products function as endothelium-derived hyperpolarizing factors (EDHFs) in rabbit arteries by stimulating KCa2.3. We investigated if LOX products contribute to EDH in rat...

Carotid Arterial Supply of the Feline Brain • A study of the supply to the feline brain by the carotid-middle cerebral arteries was conducted using in vivo transcardiac injection with a mixture of micropaque and carbon black. Modifications in the filling pattern of the arterial vessels were visualized following short-term occlusion of a middle cerebral artery. A modified surgical method to indu...

Carotid Arterial Supply of the Feline Brain • A study of the supply to the feline brain by the carotid-middle cerebral arteries was conducted using in vivo transcardiac injection with a mixture of micropaque and carbon black. Modifications in the filling pattern of the arterial vessels were visualized following short-term occlusion of a middle cerebral artery. A modified surgical method to indu...

This study examined the ultrastructural distribution of agranular vesicle-containing nerve (AVN) and granular vesicle-containing nerve (GVN) in cat cerebral blood vessels fixed in KMnO4. The percentages of the AVN and GVN throughout the adventitial layer in the basilar, middle cerebral, and anterior cerebral arteries were 63.4 and 36.7, 53.9 and 46.1, and 60.2 and 39.8, respectively. The AVN in...

Isolated rat middle cerebral arteries were perfused and superfused with physiological salt solution equilibrated with a control (approximately 140 mmHg) or reduced (approximately 35-40 mmHg) PO2. In other experiments, cerebral arteries were isolated and prostacyclin release was determined by radioimmunoassay for 6-ketoprostaglandin F1alpha. Equilibration of the vessels with reduced PO2 (35 mmHg...

Primary vasculitis of the central nervous system (PACNS) is a rare form unknown cause that affects vessels brain, spinal cord and meninges without systemic damage. It was found average age onset disease 50 years. Clinical manifestations depend on caliber affected vessels. The most common initial symptoms are headache vascular cognitive impairment associated with small vessel involvement. develo...

Spirally cut strips of cerebral and peripheral arteries from dogs were used for comparing the vasoconstricting effect of serotonin, norepinephrine, K + , and transmural electrical stimulation. Sensitivity of cerebral (basilar, posterior cerebral, and middle cerebral) arterial strips to serotonin was markedly greater than that to norepinephrine with respect to the median effective concentration ...