Is pruritus an important indicator of NMO?

Is pruritus an indicator of aquaporin-positive neuromyelitis optica?

Netravathi M, Saini J, Mahadevan A, et al.

Mult Scler 2017; 23:810-817.

Abstract

BACKGROUND:

Recently, pruritus has been recognised as an important association with neuromyelitis optica spectrum disorders (NMOSD).

RESULTS:

Among 57 consecutive patients with NMOSD, 15 (26.3% women) reported pruritus. All had aquaporin-4 (AQP4) antibodies. The mean age was 34.5 ± 9.1 years, age at onset was 31.3 ± 11.0 years and the duration of illness was 3.9 ± 3.1 years. Pruritus preceded the neurological disturbances in all the patients. Predominant patients experienced pruritus in the cervical dermatome (66.7%) followed by cervicothoracic region (13.3%), trigeminal nerve (13.3%) and lumbar region (6.7%). Lesions extending from cervicomedullary junction up to the thoracic segment was the most common site of affection (40%) followed by cervicothoracic (26.7%), cervicomedullary junction to cervical cord (13.3%), cervical cord (6.7%) and thoracic segment (6.7%).

CONCLUSION:

This report is one of the largest series reporting the close association of pruritus with onset of neurological symptoms in NMOSD. It highlights the importance of recognising this rare symptom which may help in making a correct diagnosis in a patient with suspected demyelinating disorder. In a patient with NMOSD, early treatment with immunomodulation during pruritus may prevent or minimise occurrence of neurological dysfunction.

Also see:

He Z, Ren M, Wang X, Guo Q, Qi X. Pruritus may be a common symptom related to neuromyelitis optica spectrum disorders. Mult Scler Relat Disord 2017; 13:1-3.

Both references are included in the neurochecklist:

Neuromyelitis optica (NMO): clinical features

Abstract link 1

Abstract link 2

By Nivs55Own work, CC BY-SA 3.0, Link
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How does gender influence neuromyelitis optica?

Influence of female sex and fertile age on neuromyelitis optica spectrum disorders

Borisow N, Kleiter I, Gahlen A, et al; NEMOS (Neuromyelitis Optica Study Group)

Mult Scler 2016; Epub ahead of print

ABSTRACT

Background:

Gender and age at onset are important epidemiological factors influencing prevalence, clinical presentation, and treatment response in autoimmune diseases.

Objective:

To evaluate the impact of female sex and fertile age on aquaporin-4-antibody (AQP4-ab) status, attack localization, and response to attack treatment in patients with neuromyelitis optica (NMO) and its spectrum disorders (neuromyelitis optica spectrum disorder (NMOSD)).

Methods:

Female-to-male ratios, diagnosis at last visit (NMO vs NMOSD), attack localization, attack treatment, and outcome were compared according to sex and age at disease or attack onset.

Results:

A total of 186 NMO/SD patients (82% female) were included. In AQP4-ab-positive patients, female predominance was most pronounced during fertile age (female-to-male ratio 23:1). Female patients were more likely to be positive for AQP4-abs (92% vs 55%; p < 0.001). Interval between onset and diagnosis of NMO/SD was longer in women than in men (mean 54 vs 27 months; p = 0.023). In women, attacks occurring ⩽40 years of age were more likely to show complete remission ( p = 0.003) and better response to high-dose intravenous steroids ( p = 0.005) compared to woman at >40 years.

Conclusion:

Our data suggest an influence of sex and age on susceptibility to AQP4-ab-positive NMO/SD. Genetic and hormonal factors might contribute to pathophysiology of NMO/SD.

This reference is now cited in the neurochecklist:

Neuromyelitis optica (NMO): clinical features

Abstract link

By OpenStax College – Anatomy & Physiology, Connexions Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013., CC BY 3.0, Link

What are the risks of rituximab in the treatment of neuromyelitis optica?

Efficacy and safety of rituximab therapy in neuromyelitis optica spectrum disorders: a systematic review and meta-analysis.

Damato V, Evoli A, Iorio R.

JAMA Neurol 2016; 73:1342-1348.

Abstract

IMPORTANCE:

Neuromyelitis optica spectrum disorders (NMOSDs) are autoimmune astrocytopathies characterized by predominant involvement of the optic nerves and spinal cord. In most patients, an IgG autoantibody binding to astrocytic aquaporin 4, the principal water channel of the central nervous system, is detected. Rituximab, a chimeric monoclonal antibody specific for the CD20 B-lymphocyte surface antigen, has been increasingly adopted as a first-line off-label treatment for patients with NMOSDs.

OBJECTIVE:

To perform a systematic review and a meta-analysis of the efficacy and safety of rituximab use in NMOSDs, considering the potential predictive factors related to patient response to rituximab in this disease.

EVIDENCE REVIEW:

English-language studies published between January 1, 2000, and July 31, 2015, were searched in the MEDLINE, Central Register of Controlled Trials (CENTRAL), and clinicaltrials.gov databases. Patient characteristics, outcome measures, treatment regimens, and recorded adverse effects were extracted.

FINDINGS:

Forty-six studies were included in the systematic review. Twenty-five studies that included 2 or more patients with NMOSDs treated with rituximab were included in the meta-analysis. Differences in the annualized relapse rate ratio and Expanded Disability Status Scale score before and after rituximab therapy were the main efficacy measures. Safety outcomes included the proportion of deaths, withdrawals because of toxic effects, and adverse effects.

RESULTS:

Among 46 studies involving 438 patients (381 female and 56 male [sex was not specified in 1 patient]; mean age at the outset of treatment, 32 years [age range, 2-77 years]), rituximab therapy resulted in a mean (SE) 0.79 (0.15) (95% CI, -1.08 to -0.49) reduction in the mean annualized relapse rate ratio and a mean (SE) 0.64 (0.27) (95% CI, -1.18 to -0.10) reduction in the mean Expanded Disability Status Scale score. A significant correlation was observed between disease duration and the Expanded Disability Status Scale score. Adverse effects were recorded in 114 of 438 (26%) patients treated with rituximab. Specifically, 45 patients (10.3%) experienced infusion-related adverse effects, 40 patients (9.1%) had an infection, 20 patients (4.6%) developed persistent leukopenia, 2 patients (0.5%) were diagnosed as having posterior reversible encephalopathy, and 7 patients (1.6%) died.

CONCLUSIONS AND RELEVANCE:

This systematic review and meta-analysis provides evidence that rituximab therapy reduces the frequency of NMOSD relapses and neurological disability in patients with NMOSDs. However, the safety profile suggests caution in prescribing rituximab as a first-line therapy.

This reference is now included in the neurochecklist

Neuromyelitis optica (NMO): treatment

screen-shot-2016-12-24-at-23-32-53

Abstract link

Optic nerve side view. Francisco Bengoa on Flikr. https://www.flickr.com/photos/frecuenciamedicafb/7404373800
Optic nerve side view. Francisco Bengoa on Flikr. https://www.flickr.com/photos/frecuenciamedicafb/7404373800

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