title: Reversible cerebral vasoconstriction syndrome following red blood cells transfusion: a case series of 7 patients.
abstract: BACKGROUND
  Reversible cerebral vasoconstriction syndrome (RCVS) is an infrequent disease characterized by severe headaches with or without focal neurological deficits or seizures and a reversible vasoconstriction of cerebral arteries. The Orpha number for RCVS is ORPHA284388. However, RCVS triggered by blood transfusion is rare. Here we provided the clinical, neuroimaging and outcome data of patients diagnosed with RCVS resulting from red blood cells transfusion.
  
  
  METHODS
  We retrospectively identified 7 patients presenting with RCVS after red blood cells transfusion from January 2010 to May 2014. The information on clinical features, neuroimaging and outcome were collected and analyzed.
  
  
  RESULTS
  All 7 patients were Chinese women, with a mean age of 42 years (38-46). All the patients had severe anemia (Hb level < 6 g/dl) caused by primary menorrhagia due to uterine myoma (n = 5) or end-stage renal disease (n = 2) and severe anemia persisted for a average period of 4 months (2-6). Each patient received packed red blood cells transfusion (average: 1580 ml) over a period of 2-5 days. Blood transfusion increased the hemoglobin level by at least 4.5 g/dL from baseline. The neurological symptoms appeared a mean of 6.3 days (2-13) after the last blood transfusion. Headache was the most frequent symptom and seizure, transient or persistent neurological disorders were observed. Neuroimaging showed cortical subarachnoid hemorrhage (n = 2), focal intracerebral hemorrhage (n = 2), localized brain edema (n = 3), cerebral infarction (n = 1), and posterior reversible encephalopathy syndrome (n = 2). Cerebral vasoconstrictions were demonstrated by magnetic resonance angiography or cerebral angiography. Arterial constriction reversed in all patients within 1 to 3 months of follow-up after disease onset and no relapse was observed up to a mean of 17.1 ± 4.8 months of follow-up.
  
  
  CONCLUSIONS
  RCVS is a rare complication as a result of blood transfusion in patients with chronic severe anemia and should be considered in patients who show severe headache or neurologic deficits after transfusion.
authors.affiliation: Department of Neurology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China. wen1937@sohu.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Liang
authors.affiliation: Department of Neurology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China. xuziqizy@163.com.
authors.forename: Ziqi
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Department of Neurology, Hengdian hospital of Zhejiang Province, Zhejiang, China. zhijunzhhd@163.com.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: Department of Radiology, the First Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang, China. louhy1988@sohu.com.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Lou
authors.affiliation: Department of Neurology, Tianjin Huanhu Hospital, qixiangtai road 122, 300060, Tianjin, China. weiyuetj@163.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Yue
mesh_terms: D000328:Adult; D017707:Erythrocyte Transfusion / Q000009:adverse effects*; D005260:Female; D006261:Headache / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D018810:Magnetic Resonance Angiography; D008875:Middle Aged; D012189:Retrospective Studies; D014661:Vasoconstriction / Q000502:physiology; D020301:Vasospasm, Intracranial / Q000175:diagnosis* / Q000209:etiology*