Prevalence of chronic pain with neuropathic characteristics in the Moroccan general population: a national survey.

OBJECTIVE: We conducted a telephonic survey to determine the prevalence of chronic pain with neuropathic characteristics (NC) in the Moroccan general population. DESIGN: We performed a large nationwide telephonic survey based upon a random sampling of households in the 16 administrative regions of Morocco to determine the prevalence of chronic pain with NC in the general population. We used a stratified sampling taking into account the number of residents in each region. A sample of households was drawn for each of the 16 regions using systematic sampling. OUTCOME MEASURES: A questionnaire aimed at identifying chronic pain (defined as daily pain for at least 3 months), evaluating its intensity, duration, and body locations was used. The Moroccan validated version of DN4 questionnaire was used to identify neuropathic characteristics. RESULTS: A total of 5,328 respondents participated in the survey. 21% of the respondents (1,074) (95%CI: 19,9-22,2), reported chronic daily pain for more than 3 months. The point prevalence of chronic pain with NC, was 10.6% (95% CI: 9,75-11,45). The prevalence was higher in women and individuals older than 60. Chronic pain with NC was significantly more prevalent in women, elderly, illiterate respondents, and respondents from lower social class. It was more frequently located in the lower limbs, and its intensity and duration were higher in comparison with chronic pain without neuropathic characteristics. CONCLUSION: Chronic pain with neuropathic characteristics is probably more prevalent in the general population than was previously thought and is generally more severe than other chronic pain.

C1-C2 spondylodiscitis in an adult with SAPHO syndrome: an unusual presentation.

The main advantage of recognition and diagnosis of SAPHO syndrome is the avoidance of unnecessary prolonged antibiotic treatment and repeated invasive procedures. The combination of synovitis, acne, pustulosis, hyperostosis and aseptic osteitis is known as SAPHO syndrome. The most common site of the disease is the upper anterior chest wall, characterized by predominantly osteosclerotic lesions, hyperostosis, and arthritis of the adjacent joints. Osteosclerosis of the vertebral bodies, hyperostosis, and erosions of the vertebral plates are rarely encountered. We present a case of SAPHO syndrome with C1-C2 spondylodiscitis. Diagnosis of SAPHO syndrome was established using Khan et al. criteria (Schilling, SAPHO syndrome, Encyclopedie Orphanet, 2004). CT showed osteosclerotic lesions of dens axis. MRI sequences reveal inflammatory bone marrow oedema. Radiologists should be aware of this unusual syndrome to avoid misdiagnosis (tumour/infection), unnecessary surgery, and antibiotic therapy.

Validity and reliability of the Arabic adapted version of the DN4 questionnaire (Douleur Neuropathique 4 Questions) for differential diagnosis of pain syndromes with a neuropathic or somatic component.

BACKGROUND: Verbal descriptors of pain can provide a basis for distinguishing neuropathic pain (NP) from pain of non-neuropathic origin. Much research has been undertaken to develop screening tools for this purpose. The DN4 questionnaire (NP in four questions), is one of theses tools, which was developed and validated in French in 2005. The purpose of this work is to provide an Arabic, culturally appropriate, reliable, and valid version of the DN4 interview questionnaire for the diagnosis of NP. METHODS: A study was conducted consisting of two phases. In the first phase, translation and cultural adaptation of the questionnaire into dialectal Arabic according to international guidelines was accomplished. The final version was reviewed by an expert panel, then tested on a group of 30 patients. The second phase was the validation of the translated version. The analysis of psychometric properties included reliability (internal consistency, inter-rater agreement) and validity (receiver operating characteristics curve analysis and determination of sensitivity, specificity, and positive and negative predictive values). RESULTS: A sample of 170 subjects (129 women, 75%; age: 49.5 ± 12.4 years), 94 (55.3%) with NP and 76 with non-neuropathic pain was enrolled. The questionnaire was reliable (Cronbach's alpha coefficient: 0.63, inter-rater agreement coefficient: 0.96 [0.94-0.97]) and valid for a cut-off value ≥3 points, which was the best value to discriminate between NP and NNP subjects. DISCUSSION: This study represents the second validation DN4 in a language different from the original after the Spanish adaptation. These results support the high discriminatory value of the DN4 questionnaire for identification of NP.