Frequency of Positive ANCA Test in a Population With Clinical Symptoms Suggestive of Autoimmune Disease and the Interference of ANA in its Interpretation. / Frecuencia de ANCA positivos en una población con síntomas clínicos sugestivos de enfermedad autoinmune y la interferencia de ANA en su interpretación.

BACKGROUND: Antibodies against neutrophil cytoplasm (ANCA) are associated with vasculitis. There are different methods to determine their presence. The interference of antinuclear antibodies (ANA) in the differentiation between P-ANCA and C-ANCA patterns has been described. OBJECTIVE: To determine the frequency of ANCA in a population with manifestations of autoimmune disease, and evaluate the interference of ANA in its interpretation. MATERIALS AND METHODS: Retrospective, descriptive nonexperimental cross-sectional study, including 3,330 data. The presumptive diagnosis was autoimmune disease and a test for ANCA was requested. The ANCA and ANA determinations were made by indirect immunofluorescence, L-ANCA® and CytoBead® ANCA. Anti-proteinase 3 and anti-myeloperoxidase were detected by ELISA and CytoBead® ANCA. RESULTS: ANCAs were positive in 10.21% and 12.64% of those positive for ANCA were positive for ANA. The inter-rater agreement statistic (Kappa) for anti-PR3 between CytoBead ANCA and ELISA was 100% (K=1.00; P<.05) and the agreement between anti- myeloperoxidase by ELISA and CytoBead® ANCA was high (K=0.94; P<.05). 30% of those with ANCAs had a diagnosis of a type of vasculitis; 20% of them had an autoimmune disease. CONCLUSIONS: The results suggest an overestimated request for ANCAs as a diagnostic aid in primary care which was not addressed. For an adequate evaluation of ANCAs, the indirect immunofluorescence technique should be implemented for the control and confirmation with the determination of specific antigens for anti- proteinase 3 and anti- myeloperoxidase in any of the confirmatory assays. The high concordance shown by ANCA CytoBeads makes us consider the use of this alternative for the determination of ANCAs and the confirmation. Given the interference of ANAs, the ANA test by IFI in the presence of positive P-ANCA results is recommended in order to minimize "false positives".

Lower Levels of Vitamin D Associated with Disease Activity in Colombian Patients with Systemic Lupus Erythematosus.

BACKGROUND: Systemic Lupus Erythematosus (SLE) involves genetic, environmental, and hormonal alterations, including Vitamin D deficiency. OBJECTIVE: To evaluate the association between vitamin D levels with anti-dsDNA, complement proteins, immunoglobulins levels and disease activity scores. METHODS: A cross-sectional study was performed. The levels of 25-OH vitamin D were measured in patients older than 18 years with SLE according to ACR/97 [American College of Rheumatology 1997] from 2013 to 2015. The association was assessed by Mann-Whitney U and Kruskal Wallis tests for continuous variables, and by the Chi or Fisher exact test for the nominal variables. RESULTS: Sixty-nine patients were included; 82% were women; the mean age was 38.5 years; 36.2% had low levels of vitamin D with higher consumption [p=0.006] of C4 and C3 complement proteins, plus higher levels of anti-dsDNA. Lower values of vitamin D were observed in patients with moderate to severe activity [p=0.0001] by SLEDAI [Systemic Lupus Erythematosus Activity Index] and general domain [p=0.039] and renal domain [p=0.009] by BILAG [British Isles Lupus Assessment Group] 2004. The mean vitamin D levels were higher in the group not receiving steroids when compared to those groups with dosages of 0.5-1mg/kg/d [p=0.048]. CONCLUSION: Lower levels of vitamin D are associated with greater complement protein consumption and higher disease activity rates. Therefore, it is important to evaluate vitamin D supplementation in patients with SLE as part of the treatment, especially when it includes the use of steroids.

Cultural adaptation and validation of the COPCORD questionnaire for the detection of rheumatic diseases in the indigenous Misak population

Introduction: The objective was to adapt and valídate in a culturally sensitive way the methodology of the community-oriented programme for the control of rheumatic diseases (COPCORD) in the indigenous Misak community of Colombia. Material and methods: A culturally sensitive validation of the COPCORD questionnaire in Spanish was carried out, translating into the nam trik wam language used by the Misak community of Guambia town. It was adapted to the context of this population and later a back-translation to Spanish was carried out. Finally, it was validated applying the survey with the support of bilingual translators. Participants with pain, stiffness or swelling in any joint in the previous 7 days and/or at any time in life were evaluated by physicians and physiotherapists and were then, upon confirming the diagnosis of a musculoskeletal disorder, subsequently examined by a rheumatologist. Results: In this population (n = 106), 58.5% were women with an average age of 45.5 years. In the last 7 days, 51 subjects (48.1%) reported having musculoskeletal pain and 7 (44.3%) reported pain at some time in their life. Of those who received treatment, 53.1% reported using traditional medicine, 34.4% homeopathic treatment, and 25% allopathic treatment. The COPCORD Misak demonstrated an adequate capacity to detect musculoskeletal disorders, with a sensitivity of 63.3% and a specificity of 80.3%, with a positive likelihood ratio of 3.2, and area under the curve of.71. Conclusion: The COPCORD methodology is a valid screening tool to detect musculoskeletal disorders in the Misak community.

Introducción: El objetivo fue adaptar y validar, de forma culturalmente sensible, la metodología del Programa orientado a la comunidad para el control de enfermedades reumáticas (COPCORD) en la comunidad indígena misak de Colombia. Material y métodos: Se realizó una validación culturalmente sensible del cuestionario Copcord en español, que se tradujo al nam trik wam, lengua usada por el pueblo misak del resguardo de Guambia. El cuestionario se adecuó al contexto de esta población y posteriormente se llevó a cabo una retrotraducción al español. Por último, se validó aplicando la encuesta con el apoyo de traductores bilingües. Los participantes con dolor, rigidez o hinchazón en cualquier articulación en los siete días previos, o en cualquier momento de la vida, fueron evaluados por médicos y fisioterapeutas. Al confirmarse el diagnóstico de una enfermedad musculoesquelética los participantes eran examinados por un reumatólogo. Resultados: De la población estudiada (n = 106) el 58,5% fueron mujeres, con una edad promedio de 45,4 arios. En los últimos siete días, 51 sujetos (48,1%) informaron tener dolor musculoesquelético y siete (44,3%) refirieron dolor en algún momento de su vida. Quienes recibieron tratamiento reportaron el uso de medicamentos tradicionales en un 53,1% de los casos, homeopáticos en el 34,4% y alopáticos en el 25%. El cuestionario COPCORD Misak demostró una adecuada capacidad para detectar los trastornos musculoesqueléticos, con una sensibilidad del 63,3%, una especificidad del 80,3%, una razón de verosimilitud positiva de 3,2 y un área bajo la curva de 0,71. Conclusión: La metodología COPCORD es una herramienta válida de cribado de enfermedades musculoesqueléticas en el pueblo misak.

Enfermedad de Paget de hueso esporádica. Serie de casos y revisión de la literatura / Sporadic Paget's disease of the bone. Case series and literature review

RESUMEN La enfermedad de Paget ósea es una enfermedad metabólica del hueso de etiología no esclarecida, que se caracteriza por una fase de resorción aumentada seguida por una fase de osteoformación aberrante. Es frecuente en Europa, Norteamérica, Nueva Zelanda y Australia, pero infrecuente en Asia, Medio Oriente y África. En población colombiana hay reportes de casos. Generalmente cursa asintomática y se diagnostica incidentalmente por hallazgos radiográficos o fosfatasa alcalina elevada. El uso de bifosfonatos favorece el control del recambio óseo y permite prevenir complicaciones como las fracturas. Se presenta una serie de casos en Colombia y una revisión de la literatura.

A B S T R A C T Paget's disease of the bone is a metabolic bone disease of unknown origin, and is characterised by an increased phase of resorption, followed by an aberrant osteoformation phase. It is common in Europe, North America, New Zealand, and Australia, but infrequent in Asia, the Middle East, Africa, and in the Colombian population there are case reports. It is usually asymptomatic and is diagnosed incidentally by radiographic findings or an elevated alkaline phosphatase. The use of bisphosphonates favours the control of bone turnover and prevents complications such as fractures. A series of cases in Colombia is presented, along with a review of the literature.

La proteína Dickkopf-1 y el lupus eritematoso sistémico: nuevos campos en investigación / Dickkopf-1 protein and systemic lupus erythematosus / new fields in research

El lupus eritematoso sistémico es el prototipo de las enfermedades autoinmunes no órgano-específicas, con un curso fluctuante entre periodos de remisión y crisis. La complejidad de sus mecanismos fisiopatológicos mantiene la necesidad de desarrollar nuevos tópicos de investigación que faciliten su entendimiento y generen potenciales blancos terapéuticos. La vía de señalización Wnt y su principal inhibidor la protema Dickkopf-1 tienen un rol trascendental en fenómenos biológicos como la homeostasis ósea. Sin embargo, estudios recientes en lupus eritematoso sistémico han permitido reconocer otros procesos extraóseos regulados por la proteína Dickkopf-1. Entre ellos: la preservación de la integridad de las membranas glomerulares a nivel renal, reversión de rasgos de senescencia de células mesenquimales de interés en la optimización de los planes de trasplante como medida terapéutica; y la homeostasis articular. Alrededor de estos resultados han de suscitarse nuevas investigaciones sobre la proteína Dickkopf-1 y lupus eritematoso sistémico, que consoliden la información obtenida dado el gran potencial clínico y terapéutico que implica.

Systemic lupus erythematosus is the prototype of non-organ specific autoimmune diseases, with a fluctuating course between remission and crisis. The complexity of pathophysiological mechanisms opens up the possibility to develop multiple research topics to facilitate their understanding and generate potential therapeutic targets. The Wnt signalling pathway and its main inhibitor, Dickkopf-1 protein, have a major role in biological phenomena, such as bone homeostasis. However, recent studies have enabled other extra-osseous processes regulated by Dickkopf-1 to be recognised. These include: preserving the integrity of kidney glomerular membranes, senescence reversal characteristics of mesenchymal cells of interest in optimising transplantation plans as a therapeutic measure, and joint homeostasis. Some of these results have led to further research into Dickkopf-1 and systemic lupus erythematosus, in order to consolidate the information obtained given the great clinical and therapeutic potential involved.