Electromagnetic fields - do they pose a cardiovascular risk?

Mobile wireless communication technologies have now become an everyday part of our lives, 24 hours a day, 7 days a week. Monitoring the autonomous system under exposition to electromagnetic fields may play an important role in broading of our still limited knowledge on their effect on human body. Thus, we studied the interaction of the high frequency electromagnetic field (HF EMF) with living body and its effect on the autonomic control of heart rate using Heart Rate Variability (HRV) linear and nonlinear analyses in healthy volunteers. A group of young healthy probands (n=30, age mean: 24.2 ± 3.5 years) without any symptoms of disease was exposed to EMF with f=2400 MHz (Wi Fi), and f=2600 MHz (4G) for 5 minutes applied on the chest area. The short-term heart rate variability (HRV) metrics were used as an indicator of complex cardiac autonomic control. The evaluated HRV parameters: RR interval (ms), high frequency spectral power (HF-HRV in [ln(ms2)]) as an index of cardiovagal control, and a symbolic dynamic index of 0V %, indicating cardiac sympathetic activity. The cardiac-linked parasympathetic index HF-HRV was significantly reduced (p =0.036) and sympathetically mediated HRV index 0V % was significantly higher (p=0.002) during EMF exposure at 2400 MHz (Wi-Fi), compared to simulated 4G frequency 2600 MHz. No significant differences were found in the RR intervals. Our results revealed a shift in cardiac autonomic regulation towards sympathetic overactivity and parasympathetic underactivity indexed by HRV parameters during EMF exposure in young healthy persons. It seems that HF EMF exposure results in abnormal complex cardiac autonomic regulatory integrity which may be associated with higher risk of later cardiovascular complications already in healthy probands.

Clinical experience of laboratory follow-up with noninvasive prenatal testing using cell-free DNA and positive microdeletion results in 349 cases.

OBJECTIVE: Screening via noninvasive prenatal testing (NIPT) involving the analysis of cell-free DNA (cfDNA) from plasma has become readily available to screen for chromosomal and DNA aberrations through maternal blood. This report reviews a laboratory's experience with follow-up of positive NIPT screens for microdeletions. METHODS: Patients that were screened positive by NIPT for a microdeletion involving 1p, 4p, 5p, 15q, or 22q who underwent diagnostic studies by either chorionic villus sampling or amniocentesis were evaluated. RESULTS: The overall positive predictive value for 349 patients was 9.2%. When a microdeletion was confirmed, 39.3% of the cases had additional abnormal microarray findings. Unrelated abnormal microarray findings were detected in 11.8% of the patients in whom the screen positive microdeletion was not confirmed. Stretches of homozygosity in the microdeletion were frequently associated with a false positive cfDNA microdeletion result. CONCLUSIONS: Overall, this report reveals that while cfDNA analysis will screen for microdeletions, the positive predictive value is low; in our series it is 9.2%. Therefore, the patient should be counseled accordingly. Confirmatory diagnostic microarray studies are imperative because of the high percentage of false positives and the frequent additional abnormalities not delineated by cfDNA analysis.

Iron deposition in rabbit cerebellum after exposure to generated and mobile GSM electromagnetic fields.

BACKGROUND: Mobile phone application may cause structural, functional changes and accumulation of toxic elements in brain. OBJECTIVES: The aim of this study was to investigate iron accumulation in rabbit cerebellum after exposure to RF EMF with light and scanning electron microscopy. MATERIALS AND METHODS: Histochemical analysis of iron distribution by light and electron microscopy with energy-dispersive microanalysis was used. RESULTS: Light microscopy revealed dystrophic changes of Purkinje cells in irradiated groups and iron deposits located in various parts of cerebellum. Deposits consists of C, O, Na, Mg, Al, Si, P, S, Cl, Ca and Fe. CONCLUSION: Our experiment revealed structural changes of Purkinje cells and iron and aluminium accumulations in stratum granulosum of rabbit's cerebellum after exposure to RF EMF (Fig. 6, Ref. 33).

Desempeño del RAPID3 (Routine Assessment of Patient Index Data) en pacientes con osteoartritis de rodilla, cadera o mano / RAPID3 (Routine Assessment of Patient Index Data) performance in patients with osteoarthritis of the knee, hip or hand

RAPID3 es un cuestionario autorreportado desarrollado originalmente para valorar pacientes con AR. Recientemente fue empleado en pacientes con OA de rodillas y/o caderas con buenos resultados. Objetivo: Determinar si existe correlación entre el RAPID3 y otros cuestionarios en pacientes con OA de manos (AUSCAN), cadera y/o rodilla (WOMAC) y comparar el tiempo para su realización y cálculo. Material y métodos: Estudio analítico observacional de corte transversal. Se incluyeron pacientes consecutivos ≥50 años con diagnóstico de OA de rodillas, caderas y/o manos que completaron el RAPID3; además el AUSCAN y/o WOMAC según la localización de la OA. Se midió el tiempo para completar y calcular los cuestionarios. Resultados: Se incluyeron 104 pacientes. Al comparar RAPID3 con WOMAC y AUSCAN se observó una correlación de 0,66 y 0,62 respectivamente (p<0,01). Al evaluar RAPID3 con la subescala de función del WOMAC, la correlación fue de 0,75 (p<0,01) y con WOMAC Ab de 0,68 (p<0,001). El tiempo para completar y calcular el RAPID3 fue menor que para los otros cuestionarios. Conclusión: Se observó buena correlación entre RAPID3, WOMAC y AUSCAN, requiriendo un menor tiempo para su realización y cálculo. Por lo tanto, podría ser una herramienta útil para evaluar pacientes con OA de rodilla, caderas y/o manos

Evaluación de la fatiga en pacientes con artritis psoriásica y su asociación con otras variables de la enfermedad / Evaluation of fatigue in patients with psoriatic arthritis and association with other variables of the disease

Objetivo: Evaluar la frecuencia de fatiga en pacientes con APs y su asociación con otras variables de la enfermedad. Métodos: Pacientes ≥18 años con diagnóstico de APs según criterios CASPAR. Se evaluó fatiga, rigidez matinal, dolor, actividad de la enfermedad por el paciente y el médico por escala visual graduada (EVG). Se completaron los autocuestionarios ASQoL, PsAQoL, HAQ-A, BASFI y BASDAI. Se calcularon los índices compuestos DAS28, DAPSA y CPDAI. Resultados: Se incluyeron 112 pacientes. La mediana de fatiga fue de 3 cm (RIC 0-6). Fatiga tuvo aceptable correlación con BASDAI (r:0,63), pregunta Nº1 del BASDAI (r:0,48), DAS28 (r:0,45), DAPSA (r:0,5), HAQ-A (r:0,42), PsAQoL (r:0,49), ASQoL (r:0,48), BASFI (r:0,47), EVG de dolor (r:0,48) y de rigidez matinal (r:0,55). El 30% de nuestra cohorte presentó fatiga definida como EVG ≥6 cm. En el análisis de regresión lineal múltiple, la actividad de la enfermedad articular periférica (DAPSA coef β: 0,36, p=0,0001) y la calidad de vida (PsAQoL coef β: 0,27, p=0,009) se asociaron significativamente a fatiga. Conclusión: El 30% de nuestra cohorte de pacientes presentó EVG de fatiga ≥6 cm. La fatiga se asoció independientemente con la actividad de la enfermedad articular periférica y la calidad de vida.

Objective: To evaluate the frequency of fatigue in patients with PsA and its association with other disease variables. Methods: We included patients ≥18 years of age with PsA according to CASPAR criteria. Fatigue, morning stiffness, pain and global activity by both patients and physicians were assessed using visual analogue scales (VAS). ASQoL, PsAQoL, HAQ-A, BASFI and BASDAI were completed. DAS28, DAPSA and CPDAI were calculated. Results: We included 112 patients. Median fatigue VAS was 3 cm (IQR 0-6). Fatigue had an acceptable correlation with BASDAI (r:0.63), BASDAI question Nº1 (r:0.48), DAS28 (r:0.45), DAPSA (Rho:0.5), HAQ-A (Rho:0.42), PsAQoL (Rho:0.49), ASQoL (Rho:0.48), BASFI (Rho:0.47), pain (Rho:0.48) and morning stiffness (Rho:0.55) and a regular correlation with CPDAI (Rho:034). 30% of our cohort had fatigue, as defined by a VAS equal or greater than 6 cm. In multiple linear regression analysis, adjusting for sex, age and disease duration, peripheral disease activity (DAPSA βcoeff: 0.36, p=0.0001) and quality of life (PsAQoL βcoeff: 0.27, p=0.009) were associated with fatigue. Conclusion: Prevalence of fatigue in this cohort was 30% and it was associated with greater peripheral disease activity and worse quality of life.

Validación del índice compuesto DAPSA (Disease Activity for Psoriatic Arthritis) en una cohorte de pacientes con artritis psoriásica en Argentina y determinación de sus valores de corte / Validation of the composite index DAPSA (Disease Activity for Psoriatic Arthritis) in a cohort of patients with psoriasis arthritis in Argentina and determination of their cut-off values

Objetivos: Validar el índice DAPSA en pacientes con Artritis Psoriásica (APs) en Argentina, comparar su rendimiento con índices compuestos y con la ultrasonografía (US) y establecer valores de corte. Materiales y Métodos: Se incluyeron pacientes con APs según criterios CASPAR. En 10 pacientes se realizó recuento ecográfico de articulaciones tumefactas (66) y se calculó un DAPSA ecográfico. Para establecer valores de corte se realizó la valoración de los estados de actividad de la enfermedad por 10 reumatólogos a través 20 casos hipotéticos de pacientes con APs y según los valores de corte del SDAI. Resultados: Se incluyeron 112 pacientes. DAPSA m14,3 (RIC 7-22,4). DAPSA presentó muy buena correlación con DAS28 (Rho:0,85), IAS (Rho:0,94), CDAI (Rho:0,95), SDAI (Rho:0,94) y N° de articulaciones dolorosas (Rho:0,84). DAPSA ecográfico m10,6 (RIC 8,5-17,9) presentó muy buena correlación con DAPSA (Rho:0,94). Usando los valores de corte del SDAI, elaboramos curvas ROC para establecer los valores de corte del DAPSA: ≤3,5 remisión, >3,5 a ≤13,4 baja, >13,4 a ≤26,2 moderada y >26,2 alta actividad (sensibilidad y especificidad ≥90%, área bajo la curva de 98%). Conclusión: Los valores de corte propuestos permitieron definir los diferentes estados de actividad de la enfermedad con muy buena sensibilidad y especificidad.

Objective: To validate DAPSA in patients with PsA in Argentina, evaluate its performance using other indexes, the ultrasound and establish tentative cut-off values according to disease activity. Methods: Patients with PsA according to CASPAR criteria. DAS28, DAPSA, SDAI, CDAI, and CPDAI were calculated. In 10 patients we assessed swollen joints (66) by ultrasound and calculated an ultrasound DAPSA. We tried to establish cut-off values through: the assessment of disease activity states by 10 rheumatologists through 20 hypothetical cases of patients with PsA and according to SDAI cut-off points. Finally, we validated DAPSA cut-off values in the RAPSODIA cohort. Results: We included 112 patients. DAPSA m14.3 (IQR 7-22.4). DAPSA had excellent correlation with DAS28 (Rho:0.85), CDAI (Rho:0.95), SDAI (Rho:0.94) and tender joint count (Rho:0.84). Ultrasound DAPSA m10.6 (IQR 8.5-17.9), it had excellent correlation with DAPSA (Rho:0.94). Using established cut-off values for SDAI, we performed ROC curves for DAPSA's cut-off values: ≤3.5 remission, >3.5 to ≤13.4 low, >13.4 to ≤26.2 moderate, and >26.2 high disease activity (sensitivity and specificity ≥90%, area under the curve of 98%). Conclusion: With these cut-off values is possible to define different disease activity states with a very good sensitivity and specificity.

Glucosamine dose/concentration-effect correlation in the rat with adjuvant arthritis.

There is a debate on the dose dependency, concentration-effect, hence, the beneficial effect of glucosamine (GlcN), a widely used anti-inflammatory natural product. We investigated dose/concentration-effect relationship and determined its minimum effective dose/concentration in rats with adjuvant arthritis (AA, Mycobacterium butyricum in squalene) both as preventive and ameliorating interventions. To control already emerged arthritis, rats received oral doses of placebo or 160 mg/kg.day(-1) GlcN for 6 days. For prevention, rats were orally administered 0, 20, 40, 80, or 160 mg/kg.day(-1) GlcN commencing on the day of adjuvant injection. The arthritis index (AI), serum nitrite, and body weight were recorded. Subsequently, animals were cannulated in the right jugular veins and blood samples were collected for the determination of GlcN. GlcN ameliorated and, dose-dependently, prevented AA. It also controlled nitrite. AI was inversely correlated with GlcN dose, maximum plasma concentration, and the area under the concentration curve. Minimum effective dose was approximately 40 mg/kg.day(-1) that correspond to maximum plasma concentration of 1.37 ± 0.24 mg/L, close to 1.6 mg/L reported for pharmaceutical grades of GlcN to humans. GlcN efficacy is dose and concentration dependent. If the data extrapolated to humans, a higher than the commonly tested 1500 mg/kg dosage regimen may provide more clear treatment outcomes.

Modelling plastic scintillator response to gamma rays using light transport incorporated FLUKA code.

The response function of NE102 plastic scintillator to gamma rays has been simulated using a joint FLUKA+PHOTRACK Monte Carlo code. The multi-purpose particle transport code, FLUKA, has been responsible for gamma transport whilst the light transport code, PHOTRACK, has simulated the transport of scintillation photons through scintillator and lightguide. The simulation results of plastic scintillator with/without light guides of different surface coverings have been successfully verified with experiments.

Microcalorimetric method to assess phagocytosis: macrophage-nanoparticle interactions.

This study evaluated the use of isothermal microcalorimetry (ITMC) to detect macrophage-nanoparticle interactions. Four different nanoparticle (NP) formulations were prepared: uncoated poly(isobutyl cyanoacrylate) (PIBCA), polysorbate-80-coated PIBCA, gelatin, and mannosylated gelatin NPs. Changes in NP formulations were aimed to either enhance or decrease macrophage-NP interactions via phagocytosis. Alveolar macrophages were cultured on glass slabs and inserted in the ITMC instrument. Thermal activities of the macrophages alone and after titration of 100 µL of NP suspensions were compared. The relative interactive coefficients of macrophage-NP interactions were calculated using the heat exchange observed after NP titration. Control experiments were performed using cytochalasin B (Cyto B), a known phagocytosis inhibitor. The results of NP titration showed that the total thermal activity produced by macrophages changed according to the NP formulation. Mannosylated gelatin NPs were associated with the highest heat exchange, 75.4 ± 7.5 J, and thus the highest relative interactive coefficient, 9,269 ± 630 M-1. Polysorbate-80-coated NPs were associated with the lowest heat exchange, 15.2 ± 3.4 J, and the lowest interactive coefficient, 890 ± 120 M-1. Cyto B inhibited macrophage response to NPs, indicating a connection between the thermal activity recorded and NP phagocytosis. These results are in agreement with flow cytometry results. ITMC is a valuable tool to monitor the biological responses to nano-sized dosage forms such as NPs. Since the thermal activity of macrophage-NP interactions differed according to the type of NPs used, ITMC may provide a method to better understand phagocytosis and further the development of colloidal dosage forms.

Enhanced osteopontin expression in a murine model of allergen-induced airway remodelling.

BACKGROUND: Airway remodelling is a central pathophysiological feature of chronic asthma. A wide variety of cytokines and growth factors are likely to be involved in the development of airway remodelling. Osteopontin (OPN) is a cytokine with pro-fibrotic properties; however, its role in airway remodelling in asthma has not been explored. OBJECTIVE: To determine the expression and cellular sources of OPN in a murine model of chronic allergen-induced airway remodelling. METHODS: BALB/c mice were sensitized and exposed to ovalbumin (OVA) or saline inhalations for 5 weeks and killed 24 h after the last inhalation. The following parameters of inflammation and remodelling were assessed: differential cell counts in bronchoalveolar lavage (BAL) fluid lung collagen content (colorimetric biochemical assay) and peribronchial smooth muscle content (immunohistochemistry, followed by image analysis). OPN expression in BAL and lung tissue was determined by PCR and ELISA. The cellular source and distribution of OPN were evaluated by immunohistochemistry and immunofluorescence. RESULTS: OPN expression is up-regulated in lung tissue and in BAL fluid of OVA-treated mice and correlates with collagen content and peribronchial smooth muscle area. In addition, OPN significantly increases collagen deposition in vitro in a murine lung cell line. Cells producing OPN include the airway epithelium and cells of the submucosal inflammatory infiltrate (T cells, eosinophils, and macrophages). Positive staining for OPN was also observed in bronchial tissue from human asthmatic subjects. CONCLUSION: OPN expression in the lungs is increased in a murine model of allergen-induced chronic airway remodelling, suggesting a role for this cytokine in airway remodelling in asthma.