1/98. stroke treatment guided by transcranial Doppler monitoring in a patient unresponsive to standard regimens.Today secondary prevention of stroke is based on large clinical trials with the disadvantage of a lack of individual pathophysiological aspects. This is mainly due to the difficulty in identifying the source of stroke reliably and rapidly in these patients. Recurrent microembolic events detected by transcranial Doppler monitoring (TCM) has been suggested to individualize treatment. We describe a patient with recurrent ischemic events in the posterior circulation. Repeated TCM of the PCA disclosed microembolic events in the course of an acute embolic lesion pattern demonstrated by MRI. Detection of high-intensity transient signals by TCM provided a useful guidance of pathophysiologically oriented treatment in this patient.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
2/98. Neurofibromatosis, stroke and basilar impression. Case report.Neurofibromatosis type 1 (NF1) can virtually affect any organ, presenting most frequently with "cafe au lait" spots and neurofibromas. Vasculopathy is a known complication of NF1, but cerebrovascular disease is rare. We report the case of a 51-year-old man admitted to the hospital with a history of stroke four months before admission. On physical examination, he presented various "cafe au lait" spots and cutaneous neurofibromas. neurologic examination demonstrated right-sided facial paralysis, right-sided hemiplegia, and aphasia. Computed tomography scan of head showed hypodense areas in the basal ganglia and centrum semiovale. Radiographs of cranium and cervical spine showed basilar impression. Angiography revealed complete occlusion of both vertebral and left internal carotid arteries, and partial stenosis of the right internal carotid artery. A large network of collateral vessels was present (moyamoya syndrome). It is an uncommon case of occlusive cerebrovascular disease associated with NF1, since most cases described in the literature are in young people, and tend to spare the posterior cerebral circulation. Basilar impression associated with this case may be considered a pure coincidence, but rare cases of basilar impression and NF1 have been described.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
3/98. Local intra-arterial fibrinolysis without arterial occlusion?Local intra-arterial fibrinolysis (LIF) is the best choice at present for treatment of acute vessel occlusion in the vertebrobasilar territory and also, in selected cases, in the carotid territory. In almost all cases angiography demonstrates the site of occlusion exactly and gives information about collateral circulation. Contrary to this common approach, we report five patients with severe acute thromboembolic stroke in whom angiography revealed no occlusion of relevant arteries or their main branches. Under the hypothesis of persisting occlusion of perforating arteries to the brain stem we performed LIF in patients with a clinical basilar artery syndrome. Outcome in all but one of them was good following LIF. The clinical details are described and possible reasons discussed.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
4/98. Successful use of clopidogrel for cerebrovascular accident in a patient with suspected ticlopidine-induced hepatotoxicity.OBJECTIVE: To report a case of successful clopidogrel use in a patient who developed suspected ticlopidine-induced hepatotoxicity during therapy for a cerebrovascular accident. CASE REPORT: A 79-year-old white woman with a history of hypertension, type 2 diabetes, alzheimer disease, and coronary artery disease started receiving ticlopidine 250 mg twice daily three days after hospital admission for a cerebrovascular accident. Medications prior to admission included quinapril, furosemide, insulin, atorvastatin, conjugated estrogen, medroxyprogesterone, donepezil, and vitamin e. The estrogen, medroxyprogesterone, and donepezil were discontinued on admission. Laboratory tests on admission revealed that total bilirubin, alkaline phosphatase, and aspartate aminotransferase (AST) were within normal limits. On day 39 of hospitalization, laboratory tests showed marked increases in alkaline phosphatase, AST, alanine aminotransferase, gamma-glutamyl-transferase, and 5' nucleotidase. physical examination revealed no signs of jaundice or hepatomegaly, and laboratory tests for viral hepatitis were negative. A presumptive diagnosis of ticlopidine-induced hepatotoxicity was made and ticlopidine was discontinued. The following day, clopidogrel 75 mg/d was initiated. liver function tests returned to baseline over the following four months with ongoing clopidogrel therapy. DISCUSSION: ticlopidine-induced hepatotoxicity is well documented in the literature. In the present case, clopidogrel, a structurally similar thienopyridine, was substituted for ticlopidine following the development of presumptive ticlopidine-induced hepatotoxicity. serum liver enzyme concentrations returned to baseline with continued clopidogrel therapy, suggesting that clopidogrel is a suitable alternative in patients who develop ticlopidine-induced hepatotoxicity. CONCLUSIONS: Clopidogrel may be a suitable alternative for patients who develop ticlopidine-induced hepatotoxicity.- - - - - - - - - - ranking = 9.6603086292259E-5keywords = liver (Clic here for more details about this article) |
5/98. Normal-tension glaucoma with reversed ophthalmic artery flow.PURPOSE: To describe a case of normal-tension glaucoma with bilateral complete occlusion of the internal carotid artery. methods: A 58-year-old man who had a 2-year history of normal-tension glaucoma in the left eye presented with ocular ischemic syndrome. To evaluate the orbital circulation, cerebral angiography and color Doppler imaging were performed. RESULTS: cerebral angiography showed bilateral complete occlusion of the internal carotid artery and collateral blood supply through the right and left ophthalmic arteries, in which the flow was reversed. Moreover, color Doppler imaging revealed lower blood flow velocities in the left central retinal and short posterior ciliary arteries, suggesting a steal phenomenon. CONCLUSION: Normal-tension glaucoma in the present case may be caused by chronic reduction of retrobulbar blood flow resulting from a steal phenomenon.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
6/98. Hindbrain stroke in children caused by extracranial vertebral artery trauma.Hindbrain transient ischemic attacks (TIAs) culminating in posterior circulation stroke are described in five children. Atlanto-axial subluxation and angiographical documentation of C1 to C2 level arterial pathology are documented in one patient. Four additional patients with nearly identical clinical presentations, posterior fossa TIAs, stroke and basilar angiographical pathology are reviewed. A mechanical traumatic etiology is suggested. Unexplained transient repeated brain stem and/or cerebellar sympotomatology may be due to extracranial vetebral artery stenosis or occlusion by atlanto-axial instability. After appropriate documentation, stabilization may prevent further TIAs or strokes.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
7/98. Continuous arterial spin labeling perfusion magnetic resonance imaging findings in postpartum vasculopathy.Postpartum vasculopathy (PPV) is a rare heterogeneous nonatherosclerotic vasculopathy that occurs in the puerperium. It occurs spontaneously but may be triggered by vasoconstrictor substances. The angiographic findings vary and include narrowing of the intracranial arteries and vasospasm. The angiographic findings and the occurrence of ischemic infarcts suggest that cerebral blood flow (CBF) is impaired in PPV. The purpose of this study is to determine CBF in patients with PPV. The authors conducted a case study of 3 patients with clinical and laboratory criteria for PPV examined during a 2-year period. Clinical examination, computed tomography imaging, structural magnetic resonance imaging (MRI), cerebral angiography, and continuous arterial spin labeling perfusion (CASL-PI) MRI were performed in all patients. Mean global CBF was determined, and perfusion maps were visually inspected. The CBF values and perfusion maps were correlated with the clinical symptoms and the neuroimaging findings. Three women were studied (22, 34, and 36 years old). The median time of presentation was 4 days postpartum. One presented with intracranial hemorrhage and diffuse arterial narrowing, the other 2 with stroke-like lesions, encephalopathy, and segmental narrowing mainly in the posterior circulation. CASL-PI was performed within 1 week of symptom onset in all 3 patients. Global mean CBF values were 51.8, 39.3, and 41.8 cc/100 g/min. Although global CBF was mildly diminished, it was above ischemic levels. Visual inspection of the CASL-PI perfusion maps did not reveal areas of focal hypoperfusion or hyperperfusion. In this series of patients with PPV, CBF was close to normal. Although angiography often reveals diffuse arterial narrowing, the CBF values encountered in this study do not support a state of generalized or focal oligoemia. Vasomotor tone may change intermittently in patients with PPV.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
8/98. The Moyamoya syndrome and the neurosurgeon.Three cases (two children, one adult) presenting the angiographic features of the Moyamoya syndrome are reported, and the variety of the arterial collateral system is described. If there is a progressive neurological deterioration as a consequence of an inadequate collateral circulation, the creation of a new collateral vascular channel by way of anastomosis between the superficial temporal artery and a branch of the middle cerebral artery is proposed.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
9/98. Isolated cerebral perfusion for intraoperative cerebral malperfusion in type A aortic dissection.Cerebral malperfusion due to expansion of a false lumen can occur acutely during aortic repair when retrograde femoral perfusion is initiated. We detected this catastrophe by a rapid decrease in regional cerebral oxygenation and successfully treated it by immediate isolation of the cerebral circulation from the systemic circulation. The surgical management, including the above technique, for this rare event is described.- - - - - - - - - - ranking = 2keywords = circulation (Clic here for more details about this article) |
10/98. Cerebral hyperperfusion after angioplasty and stenting of a totally occluded left subclavian artery: a case report.Cerebral hyperperfusion syndrome is documented after angioplasty of carotid and vertebral artery lesions. The authors report the first instance of cerebral hyperperfusion syndrome in the posterior cerebral circulation after angioplasty and stenting of a totally occluded left subclavian artery.- - - - - - - - - - ranking = 1keywords = circulation (Clic here for more details about this article) |
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