Reversible cerebral Vasoconstriction syndrome intERnational CollaborativE (REVERCE) network: Study protocol and rationale of a multicentre research collaboration

INTRODUCTION

Reversible cerebral vasoconstriction syndrome (RCVS) is a rare, but increasingly recognised cerebrovascular condition with an estimated annual age-standardised incidence of approximately three cases per million. Knowledge about risk factors and triggering conditions and information about prognosis and optimal treatment in these patients are limited.

METHODS

The REversible cerebral Vasoconstriction syndrome intERnational CollaborativE (REVERCE) project aims to elucidate the epidemiological and clinical characteristics of RCVS by collecting individual patient data from four countries (France, Italy, Taiwan and South Korea) in the setting of a multicentric study. All patients with a diagnosis of definite RCVS will be included. Data on the distribution of risk factors and triggering conditions, imaging data, neurological complications, functional outcome, risk of recurrent vascular events and death and finally the use of specific treatments will be collected. Subgroup analyses will be made based on age, gender, aetiology, ethnicity and geographical region of residence.

ETHICS AND DISSEMINATION

Ethical approval for the REVERCE study will be obtained from national or local institutional review boards in the participating centres. When needed, a standardised data transfer agreement will be provided for participating centres. We plan dissemination of our results in peer-reviewed international scientific journals and through conference presentations. We expect that the results of this unique study will lead to better understanding of clinical and epidemiological characteristics of RCVS patients.

Complications of reversible cerebral vasoconstriction syndrome in relation to age

INTRODUCTION

Reversible cerebral vasoconstriction syndrome (RCVS) has a heterogenous clinical and radiological presentation. We investigated whether RCVS complications vary according to age.

PATIENTS AND METHODS

In a pooled French cohort of 345 patients with RCVS, we assessed (1) rates of clinical and radiological complications, and (2) the functional outcome at 3 months according to age as a continuous variable, and in young patients aged ≤ 49 years versus those aged ≥ 50 years. The Commission Nationale Informatique et Liberté and the local ethics committee approved this study (registration number: 202100733).

RESULTS

The risk for any focal deficit and for any brain lesion were independently associated with increasing age (OR 1.4, 95% CI 1.1-1.8; p = 0.014, and OR 1.6, 95% CI 1.2-2.1; p < 0.001, respectively). Subtypes of brain lesions independently associated with increasing age were subarachnoid haemorrhage (OR 1.7, 95% CI 1.3-2.3; p < 0.001) and intracerebral haemorrhage (OR 1.5, 95% CI 1.1-2.2; p = 0.023). Frequency of cervical artery dissections peaked at age 30-39, and young age was independently associated with cervical artery dissections (OR 13.6, 95% CI 2.4-76.6; p = 0.003). Age had no impact on the functional outcome, with a modified Rankin scale score of 0-1 in > 96% of patients.

CONCLUSION

Age seems to influence rates and types of complications of RCVS, with young age being associated with cervical artery dissections, and increasing age with haemorrhagic complications. If confirmed in larger prospective studies, recognition of age-specific patterns might help to guide clinical management and to identify complications in cases of RCVS and vice versa.

Cervicogenic headache, an easy diagnosis? A systematic review and meta-analysis of diagnostic studies

BACKGROUND

The diagnosis of cervicogenic headache (CGH) remains a challenge for clinicians as the diagnostic value of detailed history and clinical findings remains unclear.

OBJECTIVES

To update and evaluate available evidence of the prevalence and the diagnostic accuracy of the detailed history and clinical findings for CGH in adults with headache.

DESIGN

Systematic review with meta-analysis.

METHODS

CINAHL, Cochrane Central, Embase, PEDro and PubMed were searched for studies before March 2022 that reported detailed history and/or clinical findings related to the diagnosis of cervicogenic headache. Study selection, risk of bias assessment (QUADAS-2 and PROBAST), and data extraction were performed. Meta-analyses for the cervical flexion-rotation test (CFRT) was performed. Certainty of the evidence was assessed with the GRADE approach.

RESULTS

Eleven studies were included. Moderate certainty evidence indicated that the CFRT differentiated CGH from lower cervical facet-induced headache, migraine, concomitant headaches or asymptomatic subjects (Se 83.0% [95%CI:70.0%-92.0%]; Sp 83.0% [95%CI:71.0%-91.0%]; positive LR 5.0 [95%CI:2.6-9.5]; negative LR 0.2 [95%CI:0.1-0.4]; n = 4 studies; n = 182 participants). Several diagnostic classifications and test clusters based on headache history and clinical findings can be useful, despite uncertain accuracy, in formulating the diagnosis of CGH.

CONCLUSION

Evidence support to undertake an evaluation of headache history and signs and symptoms and a physical examination of the patient neck to diagnose CGH. During the physical examination, a positive or negative CFRT probably has a small to moderate effect on the probability of a patient having a CGH. The diagnostic value of the other findings remains unclear.

TRIAL REGISTRATION

#CRD42020201772.

Type of headache at onset and risk for complications in reversible cerebral vasoconstriction syndrome

BACKGROUND

In a recent Italian study, 30% of patients with reversible cerebral vasoconstriction syndrome (RCVS) presented without thunderclap headache (TCH), and tended to present more severe forms of RCVS than patients with TCH. We aimed to analyze the risk for complications of RCVS in patients with and without TCH at onset.

METHODS

In a pooled cohort of 345 French patients with RCVS, we compared patients with and without TCH at onset regarding rates of neurological complications, and the functional outcome at 3 months.

RESULTS

As compared to the 281 patients with TCH at onset, the 64 patients without TCH had a higher risk for any neurological complication (61% vs. 24%, OR 4.9, 95% CI 2.8-8.7, p < 0.001). The association was strongest for cervical artery dissections (28% vs. 5%, OR 8.1, 95% CI 3.7-17.6, p < 0.001), followed by posterior reversible encephalopathy syndrome (17% vs. 3%, OR 7.1, 95% CI 2.7-18.4, p < 0.001), seizures (9% vs. 2.5%, OR 4.1, 95% CI 1.3-12.5, p = 0.019), and subarachnoid hemorrhage (41% vs. 16%, OR 3.5, 95% CI 1.9-6.3, p < 0.001). In multivariable analysis, the risk for any neurological complication remained significantly elevated in the absence of TCH (OR 3.5, 95% CI 1.8-6.8, p < 0.001). The functional outcome was equal in both groups, with a modified Rankin scale score of 0-1 in ≥90% of patients.

CONCLUSIONS

Absence of TCH at onset might predict a higher risk of complications in RCVS. Our results warrant further multicentric studies to prove this finding.

Revised guidelines of the French Headache Society for the diagnosis and management of migraine in adults. Part 1: Diagnosis and assessment

The French Headache Society proposes updated French guidelines for the management of migraine. The first part of these recommendations is focused on the diagnosis and assessment of migraine. First, migraine needs to be precisely diagnosed according to the currently validated criteria of the International Classification of Headache Disorders, 3d version (ICHD-3). Migraine-related disability has to be assessed and we suggest to use the 6 questions of the headache impact test (HIT-6). Then, it is important to check for risk factors and comorbidities increasing the risk to develop chronic migraine, especially frequency of headaches, acute medication overuse and presence of depression. We suggest to use a migraine calendar and the Hospital Anxiety and Depression scale (HAD). It is also necessary to evaluate the efficacy and tolerability of current migraine treatments and we suggest to systematically use the self-administered Migraine Treatment Optimization Questionnaire (M-TOQ) for acute migraine treatment. Finally, a treatment strategy and a follow-up plan have to be proposed. Guidelines for pharmacological and non-pharmacological treatments are presented in the second and third part of the recommendations.

Revised guidelines of the French headache society for the diagnosis and management of migraine in adults. Part 3: Non-pharmacological treatment

The French Headache Society proposes updated French guidelines for the management of migraine. This article presents the third part of the guidelines, which is focused on the non-pharmacological treatment of migraine, including physical exercise, dietary supplements and plants, diets, neuromodulation therapies, acupuncture, behavioral interventions and mindfulness therapy, patent foramen ovale closure and surgical nerve decompression.

Revised guidelines of the French headache society for the diagnosis and management of migraine in adults. Part 2: Pharmacological treatment

The French Headache Society proposes updated French guidelines for the management of migraine. This article presents the second part of the guidelines, which is focused on the pharmacological treatment of migraine, including both the acute treatment of attacks and the prophylaxis of episodic migraine as well as chronic migraine with and without medication overuse. The specific situations that can be encountered in women with migraine are also discussed, including pregnancy, menstrual migraine, contraception and hormonal replacement therapy.

Neuromodulation techniques for acute and preventive migraine treatment: a systematic review and meta-analysis of randomized controlled trials

BACKGROUND

Several neuromodulation methods exists for migraine treatment. The aim of the present study was to perform a systematic review and meta-analysis of randomized controlled trials (RCTs) focusing on migraine treatment using neurostimulation methods.

METHODS

We searched Medline and Embase up to July 1, 2020 for RCTs reporting acute or preventive treatment of migraine with either non-invasive or invasive neurostimulation methods. Two researchers independently assessed the eligibility of the retrieved studies and extracted data. Outcomes for the quantitative synthesis were 2 h pain free for acute treatment and headache days per month for preventive treatment. We performed subgroup analyses by treatment (stimulation method and site of application). Estimates were pooled using random-effects meta-analysis.

RESULTS

Thirty-eight articles were included in the qualitative analysis (7 acute, 31 preventive) and 34 in the quantitative evaluation (6 acute, 28 preventive). Remote electrical neuromodulation (REN) was effective for acute treatment. Data were insufficient to draw conclusions for any other techniques (single studies). Invasive occipital nerve stimulation (ONS) was effective for migraine prevention, with a large effect size but considerable heterogeneity, whereas supra-orbital transcutaneous electrical nerve stimulation (TENS), percutaneous electrical nerve stimulation (PENS), and high-frequency repetitive transcranial magnetic stimulation (rTMS) over the primary motor cortex (M1) were effective, with small to medium effect sizes. Vagus-nerve stimulation, left prefrontal cortex rTMS, and cathodal transcranial direct current stimulation (tDCS) over the M1 had no significant effect and heterogeneity was high.

CONCLUSION

Several neuromodulation methods are of potential interest for migraine management, but the quality of the evidence is very poor. Future large and well-conducted studies are needed and could improve on the present results.

Long-Term Outcomes After Reversible Cerebral Vasoconstriction Syndrome

Background and Purpose—

We aimed to further investigate the long-term outcomes after reversible cerebral vasoconstriction syndrome (RCVS).

Methods—

A longitudinal follow-up study was conducted in 173 RCVS patients.

Results—

Of the 172 patients who completed a mean follow-up of 9.2±3.3 years, 10 had a recurrent RCVS that was benign in all. Independent predictors of relapse were having a history of migraine and having exercise as a trigger for thunderclap headache during initial RCVS. After new delivery, the rate of postpartum RCVS was 9%.

Conclusions—

Overall, long-term outcome after RCVS is excellent.

[Post-lumbar puncture syndrome]

This article presents a clinical case which describes some clinical aspects, risk factors, management and the prophylactic methods to prevent the post-lumbar puncture syndrome.

Primary angiitis of the CNS and reversible cerebral vasoconstriction syndrome

Objectives

To further improve the distinction between primary angiitis of the CNS (PACNS) and reversible cerebral vasoconstriction syndrome (RCVS).

Methods

We compared 2 large French cohorts of patients with PACNS (n = 110, retrospectively and prospectively enrolled) and RCVS (n = 173, prospectively enrolled).

Results

Patients with RCVS were predominantly female (p < 0.0001), with migraines (p < 0.0001), and were more often exposed to vasoactive substances (p < 0.0001) or postpartum (p = 0.002) than patients with PACNS. Headache, especially thunderclap headache, was more frequent in RCVS (both p < 0.0001). Thunderclap headache was absent in only 6% of patients with RCVS and was mainly recurrent (87%) and provoked (77%) mostly by sexual intercourse, exertion, or emotion. All other neurologic symptoms (motor deficit, seizure, cognitive disorder, or vigilance impairment, all p < 0.0001) were more frequent in PACNS. At admission, brain CT or MRI was abnormal in all patients with PACNS and in 31% of patients with RCVS (p < 0.0001). Acute ischemic stroke was more frequent in PACNS than in RCVS (p < 0.0001). Although intracerebral hemorrhage was more frequent in PACNS (p = 0.006), subarachnoid hemorrhage and vasogenic edema predominated in RCVS (p = 0.04 and p = 0.01, respectively). Multiple small deep infarcts, extensive deep white matter lesions, tumor-like lesions, or multiple gadolinium-enhanced lesions were observed only in PACNS, whereas cervical artery dissection was found only in RCVS.

Conclusions

Our study confirms that careful analysis of clinical context, headache features, and patterns of brain lesions can distinguish PACNS and RCVS within the first few days of admission in most cases. However, diagnosis remains challenging in a few cases.

Prevalence and characteristics of migraine in CADASIL

Background and objective Migraine with aura (MA) is a major symptom of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL). We assessed the spectrum of migraine symptoms and their potential correlates in a large prospective cohort of CADASIL individuals. Methods A standardized questionnaire was used in 378 CADASIL patients for assessing headache symptoms, trigger factors, age at first attack, frequency of attacks and associated symptoms. MRI lesions and brain atrophy were quantified. Results A total of 54.5% of individuals had a history of migraine, mostly MA in 84% of them; 62.4% of individuals with MA were women and age at onset of MA was lower in women than in men. Atypical aura symptoms were experienced by 59.3% of individuals with MA, and for 19.7% of patients with MA the aura was never accompanied by headache. MA was the inaugural manifestation in 41% of symptomatic patients and an isolated symptom in 12.1% of individuals. Slightly higher MMSE and MDRS scores and lower Rankin score were detected in the MA group. Conclusion MA is observed in almost half of all CADASIL patients. Atypical aura symptoms are reported by more than one in two of them. MA is often inaugural, can remain isolated and is not associated with the severity of the disorder.

The Link Between Migraine, Reversible Cerebral Vasoconstriction Syndrome and Cervical Artery Dissection

Headache is the common thread of migraine, reversible cerebral vasoconstriction syndrome (RCVS) and cervical artery dissection (CeAD), three medical conditions that otherwise appear to be very different. However, epidemiological, clinical and genetic data suggest that these conditions share common and complex features and are, at least partly, linked. The purpose of this manuscript is to review existing evidence for an association between migraine, RCVS and CeAD and discuss the potential underlying mechanisms.

[Atrial fibrillation in an acute stroke unit]

Contrasting with the abundant literature dedicated to atrial fibrillation (AF) and to the use of new oral anticoagulants in this setting, very few recent studies have focused on patients with AF-associated stroke. From November 2010 to March 2011, we conducted a small prospective 4-month study in the stroke units of Lariboisière and Bicêtre hospitals. Fifty patients with FA and stroke were included (14% of all strokes), including 45 patients with cerebral infarcts (CI), 3 with transient ischemic attacks (TIA) and 2 with intracerebral hemorrhage (ICH). The results of this study, together with a review of the sparse relevant literature, underline the following points: these patients tend to be older and more frequently female than in recent clinical trials; TIAs are rare; these patients have numerous vascular risk factors and associated cerebrovascular diseases such as atheroma and leukoaraiosis; CI is often extensive and hemorrhagic; AF is discovered in a stroke unit in 40% of cases and is paroxystic in 33% of cases, with no consensus on the potential regulation; there is massive underuse of VKA in patients with known AF; rtPA intravenous thrombolysis is frequent; treatment difficulties arise in patients with AF-related CI and a history of ICH; the prognosis of VKA-related ICH is poor; the use of oral anticoagulants alone or combined with aspirin is controversial in case of AF associated with severe atheroma. Patients with AF seen in stroke units are therefore very different from those seen by cardiologists: they are older and have many vascular risk factors, stroke, and other cerebrovascular lesions, raising difficult treatment issues owing to the dual risk of embolic recurrence and symptomatic hemorrhagic transformation. In addition, contraindications to long-term VKA use are frequent. Many of these issues will again be raised with the arrival of new oral anticoagulants.

Cerebral immunoglobulin light chain amyloid angiopathy-related hemorrhages

INTRODUCTION

Cerebral amyloid angiopathy (CAA) is a common cause of intracerebral hemorrhage (ICH) particularly in elderly patients. In CAA-related hemorrhages, amyloid deposits in the brain vessel walls mainly contain amyloid beta-protein (A-beta). Rarely other forms of amyloid substances have been reported in sporadic CAA-related hemorrhages.

METHODS

We report the case of a 44-year-old patient with recurrent ICH who had surgical evacuation of a large frontal hematoma. Following surgery, samples from the hematoma and adjacent cerebral cortex were obtained for histopathological examination.

RESULTS

Within the recent hemorrhage, a few arteriolar walls were thickened with an amyloid deposit that was immunostained for immunoglobulin (Ig) M and light chain lambda. In the wall of some vessels, around the amyloid deposits, as well as in the adjacent cerebral cortex, there was an infiltration by monotypic lymphocytes and plasma cells expressing IgM and light chain lambda. No amyloid deposition was found outside the hemorrhage. There was no evidence of multiple myeloma, B-cell malignancy, or systemic amyloidosis.

CONCLUSIONS

Recurrent ICH may be due to amyloid deposition of IgM lambda produced by monotypic proliferation of lymphocytes and plasma cells purely localized to the brain.