Abstract:
BACKGROUND:Cerebral vasospasm following subarachnoid haemorrhage (SAH) remains one of the major factors contributing to poor overall patient outcome. Prostaglandin F2-alpha (PGF2a) induces vasoconstriction. After SAH, PGF2a leads to cerebral inflammation and enhanced vasoconstriction, resulting in cerebral vasospasm. Losartan is already known to have beneficial effects in stroke models and also on several cerebral inflammatory processes. Therefore, the aim of the study was to analyse the effect of losartan on PGF2a-enhanced vasoconstriction after SAH. METHODS:To investigate the effect of losartan on PGF2a-enhanced vasoconstriction after SAH, cerebral vasospasm was induced by a double-haemorrhage model. Rats were killed on day 3 and 5 after SAH followed by measurement of the isometric force of basilar artery ring segments in an organ bath. RESULTS:PGF2a induced a dose-dependent contraction. After pre-incubation with losartan, the maximum contraction (Emax) for sham-operated animals was significantly lowered [Emax 6% in losartan 3 × 10-4 molar (M) vs. 56% without losartan]. Also, after induced SAH, PGF2a induced no vasoconstriction in pre-incubated vessels with losartan 3 × 10-4 M on day 3 (d3) as well as on day 5 (d5). For the vasorelaxative investigations, vessel segments were pre-incubated with PFG2a. Cumulative application of losartan completely resolved the pre-contraction in sham-operated animals (non SAH: 95% relaxation). After SAH, losartan not only resolved the pre-contraction (d5: 103%), but also exceeded the pre-contraction (d3: 119%). Therefore, a statistically significantly increased and earlier relaxation was calculated for all losartan concentrations [Emax (d3/d5) and pD2 (d3/d5)] compared with the solvent control group. CONCLUSION:In a physiological and pathophysiological setup, losartan reduces a PGF2-induced vasoconstriction and reverses a PGF2a-precontraction completely. This fact can be integrated in pushing forward further concepts trying to antagonise/prevent cerebral vasospasm after SAH.
journal_name
Acta Neurochir (Wien)journal_title
Acta neurochirurgicaauthors
Wanderer S,Mrosek J,Gessler F,Seifert V,Konczalla Jdoi
10.1007/s00701-017-3419-2subject
Has Abstractpub_date
2018-02-01 00:00:00pages
277-284issue
2eissn
0001-6268issn
0942-0940pii
10.1007/s00701-017-3419-2journal_volume
160pub_type
杂志文章abstract:BACKGROUND:Middle cerebral artery (MCA) aneurysms are among the more challenging aneurysms for endovascular treatment. We report a contemporary 5-year experience with endovascular therapy for MCA aneurysms at a high-volume neurovascular center. METHODS:Review of prospectively maintained intracranial aneurysm database....
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abstract:BACKGROUND:Operative skills are key to neurosurgical resident training. They should be acquired in a structured manner and preferably starting early in residency. The aim of this study was to test the hypothesis that the outcome and complication rate of anterior cervical discectomy and fusion with or without instrument...
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abstract:BACKGROUND:Oculomotor cistern extension (OMCE) of pituitary adenoma through the oculomotor triangle may be one of the major characteristics of multi-lobulated adenoma. The OMCE may be hard to remove only through the endonasal approach. METHOD:We applied the simultaneous combined supra-infrasellar approach to remove pi...
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abstract::Out of 502 patients with surgically treated drug-resistant chronic epilepsy (tumour cases excluded) in 12 (2%) a clear occipital focus was found. The pattern of seizures was in most cases nonspecific and polymorphic. EEG examination and neuroradiological findings led to proper localization of the epileptogenic focus. ...
journal_title:Acta neurochirurgica
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abstract:BACKGROUND:Orthostatic headache (OH) is a potential complication of lumbar drainage (LD) usage. The incidence and risk factors for OH with the use of lumbar drainage during endoscopic endonasal procedures have not been documented. OBJECTIVE:To investigate the incidence of post-procedure OHs associated with placement o...
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abstract:BACKGROUND:Multicentric WHO grade II gliomas constitute a rare entity. Their pathogenesis and treatment are still a matter of debate. OBJECTIVE:We present a 23 year-old female with two synchronous but separate WHO grade II oligodendrogliomas in the temporal and frontal lobes. CLINICAL FEATURES:The two lesions showed ...
journal_title:Acta neurochirurgica
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abstract::The review of the literature on Cheyne-Stokes respiratory periods reveals enormous variation of the opinions expressed. The original description concerned periodicity characterized by rhythmic changes of respiratory phases and respiratory pauses in a relation of 60 : 15 seconds. In the respiratory phase there were 30 ...
journal_title:Acta neurochirurgica
pub_type: 历史文章,杂志文章,评审
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abstract::Leptomeningeal cysts are commonly seen in children usually following trauma and associated with bulging leptomeninges at the site of fracture. Intradiploic leptomeningeal cyst is an important differential for an expansile lytic lesion in the bony calvarium especially in a patient with a previous history of trauma. Her...
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journal_title:Acta neurochirurgica
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abstract::Extravasation of Onyx is a rare complication during embolization of arteriovenous malformations (AVM). We present a case of embolization that was complicated by leakage of Onyx into the cerebellum which was later encountered during surgical excision of the AVM. Our goal is to report this rare event and to outline succ...
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abstract::The case report here deals with an intracavernous arterial aneurysm spontaneously developing into a carotid-cavernous fistula. The etiopathology of these fistulas is discussed. ...
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abstract::A treatment protocol for a controlled open study in patients with subarachnoid haemorrhage (SAH) from cerebral aneurysms is presented, applying acute surgery and pharmacological prevention of symptomatic vasospasm: In patients clinically graded I-III (Hunt and Hess), operation is performed within 48 to 72 hours. After...
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pub_type: 杂志文章
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更新日期:2007-08-01 00:00:00
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journal_title:Acta neurochirurgica
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更新日期:1990-01-01 00:00:00
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更新日期:2010-08-01 00:00:00
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更新日期:1997-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2018-04-01 00:00:00
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journal_title:Acta neurochirurgica
pub_type: 杂志文章
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更新日期:2004-10-01 00:00:00
abstract::At the National Institute of Neurosurgery a team of ophthalmologists and neurosurgeons has for 20 years been collaborating in the research and treatment of optic nerve gliomas. Among 34 patients, 30 were under the age of 20 years, and 20 under the age of 10 years. Of the 20 patients younger than 10 years, 16 were girl...
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abstract::The Schaltenbrand and Wahren stereotactic atlas was critically re-examined focusing on the technical quality and the consistency of the horizontal, sagittal and frontal microscopic cut series. From each series, both an isotropic contour and a solid volume model represented by a 256 matrix with an edge length of 6.4 cm...
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pub_type: 杂志文章
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pub_type: 临床试验,杂志文章
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更新日期:2000-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2020-07-01 00:00:00