Reversible cerebral vasoconstriction syndrome associated with autonomic dysreflexia
© Springer-Verlag 2010
Received: 6 December 2009
Accepted: 1 February 2010
Published: 26 February 2010
A 32-year-old man with a residual spastic quadriparesis from a traumatic C5–C6 fracture experienced a severe thunderclap headache. The medical history revealed an episode of autonomic dysreflexia (AD) due to neurogenic bladder/urinary tract infection (UTI). Blood pressure monitoring at admission revealed hypertension; blood pressure reaching 160/100 mmHg (average blood pressure in these patients and also in this patient being 90/60 mmHg). CT scan of the head, cerebrospinal fluid examination, CT angiography and MR angiography of the brain vessels were normal. Another UTI and a subsequent spell of AD were diagnosed. The patient continued to experience recurrent thunderclap headaches. Selective catheter cerebral angiography revealed multiple calibre changes in the intracranial blood vessels. A diagnosis of reversible cerebral vasoconstriction syndrome (RCVS) due to AD was considered. A magnetic resonance imaging (MRI) of the brain after 2 weeks revealed ischaemic changes in the left hemisphere. Follow-up brain MRI after 3 weeks showed reduction in size of the ischaemic changes, and catheter angiography after 6 weeks demonstrated improvement/normalization. A diagnosis of RCVS could be established. Repeated MRI/CT of the brain after 6 months demonstrated a large infarction in the left hemisphere. RCVS has been reported to occur in various clinical settings. It can occur in the setting of AD in patients with traumatic cervical cord injury. Prompt recognition of RCVS may be of vital importance to avoid further morbidity in patients with spinal cord injury.
Reversible cerebral vasoconstriction syndrome (RCVS) has been reported to occur in various clinical settings. Although it may occur spontaneously, various associated conditions have been described, e.g. uncontrolled hypertension, pheochromocytoma, pregnancy or puerperium (postpartum angiopathy), neurosurgical procedures, head trauma, vasoactive substances and recreational drugs. RCVS is a syndrome characterized by a sudden thunderclap-like headache, with or without focal neurological deficits and reversible vascular narrowing of the large and medium-sized cerebral arteries of the circle of Willis and its branches. It occurs most commonly in women aged 20–50 years. Improvement in vasospasm is expected with or without treatment within days to weeks of the onset of symptoms [1–5]. RCVS associated with autonomic dysreflexia (AD) is not hitherto described. We report a patient with spastic residual quadriparesis who developed RCVS with subsequent cerebral infarction in the setting of AD.
Our case study highlights a patient with AD. Evaluations revealed reversible segmental vasoconstriction of the intracranial blood vessels. RCVS was diagnosed. The patient responded to therapy, but developed a large cerebral infarction.
Patients with RCVS can be misdiagnosed as having primary cerebral vasculitis. However, our patient displayed no signs of vasculitis, e.g. abnormal CSF, abnormal laboratory tests, subacute/chronic onset of headache and insidious/progressive dull aching headache .
The only considerable aetiology for RCVS in the patient was AD. Our patient does fulfil the criteria for AD, which is a potentially dangerous complication of subacute and chronic SCI usually occurring with lesions above the splanchnic sympathetic outflow (T6). The most dramatic clinical feature of this syndrome is the sudden significant elevation of blood pressure resulting in a hypertensive emergency. Elevation of blood pressure is perceived by baroreceptors in the aorta, causing increased vagal stimulation by the brain and subsequent distending of rostral vascular beds. The cerebral beds dilate, causing a migraine-type headache. Objectively, any increase in systolic blood pressure greater than 40 mmHg (130 mmHg) should be considered as a possible dysreflexic episode .
AD has been associated with reversible posterior leukoencephalopathy syndrome (RPLS) . In this case report, the authors suggested that RPLS was associated with a sudden elevation of blood pressure due to AD. It has also been associated with hypertensive encephalopathy (HE). Yarkony et al. described three cases of seizures secondary to AD that are compatible with HE [8, 9]. RPLS and HE are probably the same syndrome, but with different causes .
RCVS demonstrates high comorbidity with HE and RPLS [2, 4]. Vasoconstriction resulting in posterior ischaemic changes is one postulated connection between RCVS and RPLS [2, 11, 12]. The first description of RCVS is in line with the present-day criteria for RPLS [2, 13]. RCVS may possibly occur as a cause of RPLS, due to ischaemia or cerebral oedema and as a consequence of hypertension in RPLS when cerebral autoregulation is overwhelmed by massive increases in arterial and cerebral perfusion pressure . The coexistence of HE/RPLS and RCVS suggests that a disturbance in cerebral arterial tone is the pathophysiologic basis of both syndromes [2, 3, 14].
Although the pathophysiology of RCVS remains unknown, the current theory is of a transient disturbance in the control of cerebral vascular tone. Aberrant central regulation of a spontaneous or evoked sympathetic surge may underlie the reversible vascular alterations of RCVS. The theory is derived from the association of RCVS with exertion, sympathomimetic agents, pheochromocytoma and hypertensive crises [2, 3, 14]. The temporal pattern of RCVS suggests that the underlying disturbance in the control of cerebral arterial tone first involves small distal arteries responsible for thunderclap headaches, haemorrhages and RPLS and then progresses towards large-sized arteries responsible for ischaemic events as cerebral infarction .
In our case, the patient suffered a large stroke. Stroke can be a serious consequence of RCVS. Ducros et al.  found that stroke occurred in 9% of their patients, consistent with the 7% found in previously published prospective series .
There is little evidence of any effective treatment for RCVS . Calcium-channel blockers such as nimodipine are empirically used in the treatment of RCVS. Nimodipine may be given intravenously for a few days, in the same doses as for aneurysmal SAH (1–2 mg/kg per h with monitoring of blood pressure) or orally 60 mg every 4–8 h, for 4–12 weeks. The effect this has on the various symptoms and complications is unclear. Thunderclap headaches seem to stop within 48–72 h, but transient ischaemic attacks or even infarction have been reported in patients treated for several days [1, 16]. A systematic review found no significant difference in outcome between cases treated with calcium-channel blockers versus those that were not [2, 17]. Nimodipine has no effect on ultrasonographic markers of vasoconstriction [2, 11]. Intra-arterial application of nimodipine has been reported in the treatment of RCVS, analogous to intra-arterial nimodipine treatment for refractory cerebral vasospasm after aneurysmal subarachnoid haemorrhage . The conclusion in the report was that intra-arterial application should be considered in RCVS in progressive or treatment-refractory cases, although only as emergency therapy. Further clinical studies are warranted to determine the best possible therapeutic approach .
Our report supports the theory of abnormal sympathetic activity, which is observed in AD, as the underlying pathophysiology of RCVS. Schwedt et al.  suggested AD as one factor in the pathophysiology of RCVS. The proximal portions of the large intracranial arteries are innervated by noradrenaline-containing sympathetic afferents, which modulate vascular tone. Abnormal antidromic discharge of sympathetic afferents, i.e. autonomic dysreflexia can cause alterations in vascular tone or acute vasoconstriction and produce head pain. This has hitherto been a theory without actual examples in the clinical setting and, to our knowledge, this is the first report of RCVS associated with AD.
In conclusion, RCVS can occur in the setting of AD in patients with traumatic cervical cord injury. Prompt recognition of RCVS may be of vital importance to avoid further morbidity in SCI patients.
Conflict of interest
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