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  • RCVS
  • Speculated mechanisms include reperfusion injury attributable to vasodilatation after severe vasoconstriction or as a consequence of hypertension and disturbed autoregulation (as may occur in another poorly understood syndrome that overlaps with RCVS, posterior reversible encephalopathy syndrome). (ahajournals.org)
  • Acquiring these data at multiple time points during RCVS progression, the investigators will assess the relationship between vasoconstriction and downstream perfusion and determine the role of these imaging techniques in early and accurate diagnosis of RCVS. (clinicaltrials.gov)
  • depending on the degree of vasoconstriction, RCVS may be associated with cortical subarachnoid haemorrhage (in approximately 34% of patients), ischaemic infarction (6-39% of patients), or concomitant posterior reversible encephalopathy syndrome (PRES, 9-38% of patients). (clinicaltrials.gov)
  • The hallmark of RCVS is vasoconstriction seen on vascular imaging scans and typically reverses within 3 months. (clinicaltrials.gov)
  • Prevalence of radiological vasoconstriction seen on magnetic resonance angiography (MRA) in RCVS is reported to be between 60-90% and typically appears as diffuse segmental constriction of large and medium sized vessels lasting 4-12 weeks. (clinicaltrials.gov)
  • arteries
  • Similar postangioplasty vasoconstriction was observed in the pig carotid arteries (decrease in minimal vessel cross-sectional area of 41% [angioplasty segment] versus 2% [control segment]) (p less than 0.005). (ahajournals.org)
  • epinephrine
  • Depending on the vascularity of the injection site, vasoconstriction induced by local anesthetic and the addition of epinephrine may contribute to decreased absorption of local anesthetics into systemic circulation [ 14 ]. (hindawi.com)
  • systemic
  • Generalized vasoconstriction usually results in an increase in systemic blood pressure, but it may also occur in specific tissues, causing a localized reduction in blood flow. (wikipedia.org)
  • reflex
  • Local heating (40 degrees C) was achieved with a Peltier element, and reflex vasoconstriction induced by immersion of the contra-lateral hand and forearm for 3 min in water at 15 degrees C. The change in skin blood flow was measured and a vasoconstriction index (VAC: cooling/before cooling) calculated. (lu.se)
  • subarachnoid
  • This is important because the most commonly understood reason for vasospasm or vasoconstriction in stroke is as a result of subarachnoid hemorrhage (usually, but not always, aneurysmal). (ahajournals.org)
  • concentration
  • Regression analyses were performed to determine the relationship between the reported physicochemical properties of local anesthetics and the local anesthetic concentration that produced 50% (ED 50 ) of the local anesthetic-induced maximum vasoconstriction. (hindawi.com)