Neurological involvement in primary Sjögren syndrome: a focus on central nervous system.
OBJECTIVE
Sjögren syndrome is an autoimmune disease involving mainly salivary and lacrimal glands. Beyond widely described PNS involvement, high variable prevalence of CNS manifestations ranging from 2.5 and 60% of all pSS patients has been reported, without specific syndrome definition. The aim of this cohort study was to evaluate the prevalence of CNS signs and symptoms in pSS patients and to identify possible biomarkers of CNS damage.


METHODS
120 patients with pSS diagnosis according to the 2002 American-European Consensus Group criteria were enrolled after exclusion of secondary causes. All patients underwent to a wide neurological, neuropsychological, psychiatric, neuroradiological and ultrasonographic evaluation.


RESULTS
Central and peripheral nervous system involvement was observed in 81 patients with a prevalence of 67.5%. The prevalence of CNS involvement was significantly higher than PNS disease (p 0.001). 68 patients (84%) shown non-focal CNS symptoms and 64 (79%) focal CNS deficits with headache as the most common feature (46.9%), followed by cognitive (44.4%) and mood disorders (38.3%). Particularly, we observed a high prevalence of migraine without aura, subcortical frontal executive functions and verbal memory impairment and apathy/alexythimia. MR spectroscopy revealed a reduction of NAA levels or NAA/Cr ratio decrease in subcortical frontal and basal ganglia white matter, while ultrasonography showed an impairment of microvasculature response. At multivariate analysis, headache, cognitive disorders and psychiatric symptoms was significantly associated to serological markers (anti-SSA), MRS and ultrasonographic features.


CONCLUSIONS
The higher prevalence of MWO-mimic headache, cognitive dys-executive syndrome and mood disorders observed in this series confirmed previous evidences of a higher diffused CNS compromission rather than focal involvement such as SM-like clinical course or NMO-like syndrome. The association with immunological biomarkers, metabolic cerebral dysfunction and microvascular damage suggests a possible endothelial dysfunction of the cerebral microcirculation or a potential inflammation-mediated shift of the neurovascular coupling.
Neuroimmunological Centre, Department of Neurology and Psychiatry, Sapienza - University of Rome, Rome, Italy ; Neurosonological Unit, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy.
Manuela
M
Morreale
Neurosonological Unit, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy ; Department of Clinical Neurosciences, Neurological Centre of Latium - Institute of Neurosciences, Rome, Italy.
Pasquale
P
Marchione
Neurosonological Unit, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy ; Neuropsychology Outpatients Service, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy.
Patrizia
P
Giacomini
Neuroimmunological Centre, Department of Neurology and Psychiatry, Sapienza - University of Rome, Rome, Italy.
Simona
S
Pontecorvo
Neuropsychology Outpatients Service, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy.
Massimo
M
Marianetti
Neurosonological Unit, Department of Medical and Surgical Sciences and Biotechnologies - Section of Neurology, Sapienza - University of Rome, Rome, Italy.
Claudio
C
Vento
Department of Clinical Neurosciences, Neurological Centre of Latium - Institute of Neurosciences, Rome, Italy ; Neuroradiological Unit, Department of Neurology and Psychiatry, Sapienza - University of Rome, Rome, Italy.
Emanuele
E
Tinelli
Neuroimmunological Centre, Department of Neurology and Psychiatry, Sapienza - University of Rome, Rome, Italy.
Ada
A
Francia
D000328:Adult; D000368:Aged; D002490:Central Nervous System / Q000473:pathology*; D002493:Central Nervous System Diseases / Q000209:etiology / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012859:Sjogren's Syndrome / Q000150:complications / Q000503:physiopathology*