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Int J Neurosci. 2002 Aug;112(8):959-63.
Seasonal and environmental temperature variation in the occurrence of ischemic strokes and intracerebral hemorrhages in a Turkish adult population.
Anlar O, Tombul T, Unal O, Kayan M.
Department of Neurology, Yuzuncu Yil University Medical School Hospital, 65200 Van, Turkey. omeranlayu.edu.tr
Seasonal and weather influence on the incidence of cerebrovascular disease has been reported previously. The aim of this retrospective study was to determine whether the time of onset of ischemic strokes (IS) and intracerebral hemorrhages (ICH) were associated with the environmental temperature or the time, as a month or season, in our region. We analyzed the monthly and seasonal incidence of stroke between 1997 and 2001. Four hundred and fifty-one cases were admitted to our clinic (IS; n = 288 and ICH; n = 163), and aged from 16 to 94 years. The study was carried out in province of Van in eastern Turkey. The present study demonstrated a peak occurrence of IS in August (n = 41). For ICH, we observed a peak occurrence in July (n = 23). The highest number of IS occurred in summer (n = 108), the most moderate amount in autumn (n = 81), and the least in spring (n = 38). The hemorrhagic events were highest in summer (n = 58), most moderate in winter (n = 61), and lowest in spring (n = 31) and autumn (n = 32). There was a significantly greater incidence of IS and ICH during the summer than any other season in the province of Van, Turkey. This may reflect the role of weather temperature in the development of stroke and allow us to take preventive measures.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12448836&dopt=Abstract hemorrhage
J Neurosurg. 2002 Nov;97(5):1023-8.
Intracranial saccular aneurysm enlargement determined using serial magnetic resonance angiography.
Phan TG, Huston J 3rd, Brown RD Jr, Wiebers DO, Piepgras DG.
Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905, USA.
OBJECT: The goal of this study was to determine the frequency of enlargement of unruptured intracranial aneurysms by using serial magnetic resonance (MR) angiography and to investigate whether aneurysm characteristics and demographic factors predict changes in aneurysm size. METHODS: A retrospective review of MR angiograms obtained in 57 patients with 62 unruptured, untreated saccular aneurysms was performed. Fifty-five of the 57 patients had no history of subarachnoid hemorrhage. The means of three measurements of the maximum diameters of these lesions on MR source images defined the aneurysm size. The median follow-up period was 47 months (mean 50 months, range 17-90 months). No aneurysm ruptured during the follow-up period. Four patients (7%) harbored aneurysms that had increased in size. No aneurysms smaller than 9 mm in diameter grew larger, whereas four (44%) of the nine aneurysms with initial diameters of 9 mm or larger increased in size. Factors that predicted aneurysm growth included the size of the lesion (p < 0.001) and the presence of multiple lobes (p = 0.021). The location of the aneurysm did not predict an increased risk of enlargement. CONCLUSIONS: Patients with medium-sized or large aneurysms and patients harboring aneurysms with multiple lobes may be at increased risk for aneurysm growth and should be followed up with MR imaging if the aneurysm is left untreated.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12450022&dopt=Abstract hemorrhage
J Neurosurg. 2002 Nov;97(5):1179-83.
Transcorneal stimulation of trigeminal nerve afferents to increase cerebral blood flow in rats with cerebral vasospasm: a noninvasive method to activate the trigeminovascular reflex.
Atalay B, Bolay H, Dalkara T, Soylemezoglu F, Oge K, Ozcan OE.
Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara, Turkey. basaraskent-ank.edu.tr
OBJECT: The goal of this study was to investigate whether stimulation of trigeminal afferents in the cornea could enhance cerebral blood flow (CBF) in rats after they have been subjected to experimental subarachnoid hemorrhage (SAH). Cerebral vasospasm following SAH may compromise CBF and increase the risks of morbidity and mortality. Currently, there is no effective treatment for SAH-induced vasospasm. Direct stimulation of the trigeminal nerve has been shown to dilate constricted cerebral arteries after SAH; however, a noninvasive method to activate this nerve would be preferable for human applications. The authors hypothesized that stimulation of free nerve endings of trigeminal sensory fibers in the face might be as effective as direct stimulation of the trigeminal nerve. METHODS: Autologous blood obtained from the tail artery was injected into the cisterna magna of 10 rats. Forty-eight and 96 hours later (five rats each) trigeminal afferents were stimulated selectively by applying transcorneal biphasic pulses (1 msec, 3 mA, and 30 Hz), and CBF enhancements were detected using laser Doppler flowmetry in the territory of the middle cerebral artery. Stimulation-induced changes in cerebrovascular parameters were compared with similar parameters in sham-operated controls (six rats). Development of vasospasm was histologically verified in every rat with SAH. Corneal stimulation caused an increase in CBF and blood pressure and a net decrease in cerebrovascular resistance. There were no significant differences between groups for these changes. CONCLUSIONS: Data from the present study demonstrate that transcorneal stimulation of trigeminal nerve endings induces vasodilation and a robust increase in CBF. The vasodilatory response of cerebral vessels to trigeminal activation is retained after SAH-induced vasospasm.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12450041&dopt=Abstract hemorrhage
163.com
OBJECT: A new experimental model of chronic cerebral hypoperfusion was developed to study the effects of systemic arterial shunting and obstruction of the primary vessel that drains intracranial venous blood on cerebral perfusion pressure (CPP), as well as cerebral pathological changes during restoration of normal perfusion pressure. METHODS: Twenty-four Sprague-Dawley rats were randomly assigned to either a sham-operated group, an arteriovenous fistula (AVF) group, or a model group (eight rats each). The animal model was readied by creating a fistula through an end-to-side anastomosis between the right distal external jugular vein (EJV) and the ipsilateral common carotid artery (CCA), followed by ligation of the left vein draining the transverse sinus and bilateral external carotid arteries. Systemic mean arterial pressure (MAP), draining vein pressure (DVP), and CPP were monitored and compared among the three groups preoperatively, immediately postoperatively, and again 90 days later. Following occlusion of the fistula after a 90-day interval, blood-brain barrier (BBB) disruption and water content in the right cortical tissues of the middle cerebral artery territory were confirmed and also quantified with transmission electron microscopy. Formation of a fistula resulted in significant decreases in MAP and CPP, and a significant increase in DVP in the AVF and model groups. Ninety days later, there were still significant increases in DVP and decreases in CPP in the model group compared with the other groups (p < 0.05). Damage to the BBB and brain edema were noted in animals in the model group during restoration of normal perfusion pressure by occlusion of the fistula. Electron microscopy studies revealed cerebral vasogenic edema and/or hemorrhage in various amounts, which correlated with absent astrocytic foot processes surrounding some cerebral capillaries. CONCLUSIONS: The results demonstrated that an end-to-side anastomosis between the distal EJV and CCA can induce a decrease in CPP, whereas a further chronic state of cerebral hypoperfusion may be caused by venous outflow restriction, which is associated with perfusion pressure breakthrough. This animal model conforms to the basic hemodynamic characteristics of human cerebral arteriovenous malformations.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12450044&dopt=Abstract hemorrhage
Clin Exp Hypertens. 2002 Oct-Nov;24(7-8):485-91.
The Perugia hospital-based Stroke Registry: report of the 2nd year.
Silvestrelli G, Corea F, Paciaroni M, Milia P, Palmerini F, Parnetti L, Gallai V.
Department of Neuroscience, University of Perugia, Italy. silvestrellotmail.com
This study reports the characteristics of stroke patients admitted to our hospital in the period Jan 1st, 1998-Dec 31st 1999. Seven hundred and ninety seven consecutive subjects (412 males; mean age 71 +/- 13 years) with a first-ever stroke were registered. Two-thirds of patients (65%) were admitted to the Stroke Unit (SU). The remaining part was managed in six general medicine wards (GM) or other services [neurosurgery and intensive care units (ICU+ NS)]. Ischemic stroke occurred in 534 subjects (67%). The high prevalence (30.1%) of haemorrhages can be partly explained by the presence of specialized neurosurgical services. Athero-thrombotic infarctions occurred in 21.7% of patients, lacunar in 24.7%, cardioembolic in 18.1%, other determined in 6.1%, and other undetermined in 27.5%. Overall hospital mortality was 10%. In cerebral hemorrhage mortality was 18% (44/240) vs. 6.3% (32/534) in ischemic stroke (p < 0.05). The distribution of stroke types and mortality was similar to other previous reports.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12450223&dopt=Abstract hemorrhage
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