A study on therapeutic plasma exchange using apheresis in treatment of Guillain-Barré syndrome in a tertiary care teaching hospital

Background: Therapeutic plasma exchange (TPE) is the separation and removal of plasma from whole blood with replacement by a crystalloid/colloid solution (typically albumin or plasma). The DGHS has established guidelines and recommendations for application of therapeutic apheresis in clinical practice. Guillain-Barré syndrome (GBS) is considered category I indications for TPE. This study was undertaken to establish the effectiveness and safety of therapeutic plasma exchange in GBS which is one of the common indication for TPE at our tertiary care teaching hospital.Methods: A retrospective study of 30 patients admitted to a tertiary care teaching hospital, from January 2014 to December 2016 with clinical signs of Guillain-Barre syndrome (GBS) and/or GBS variants were evaluated for performing TPE. A total of 104 procedures were performed for 30 patients. Replacement of crystalloids and plasma was used. Medical Research Council scale was used to assess the clinical improvement by measuring the grade of muscle power. Information was collected in a structured proforma and statistical analysis was performed using SPSS software (version 20). P value less than 0.05 was considered statistically significant.Results: During the study period, 104 procedures were performed on 30 patients on an average of three procedures per patient. The average age of the patients was 41.4±10.4 years. The mean period of illness at admission was 14.5±5.4 (range 4-32) days. In 23 out of 30 patients, more than three TPE procedures were done, out of which 21 patients clinically improved. The common complications during the procedure were chills (16%), hypotension (10%) and non-hemolytic febrile transfusion reaction (10%) and they were managed accordingly. Two (6.7%) patients who were not ambulatory at discharge had significantly (p <0.05) lower grade of power in lower limbs at admission and all patients recovered fully on follow up.Conclusions: GBS is one of the most commonly occurring clinical paralytic disorders. 76.7% of patients underwent three or more cycles of TPE with 70% had excellent clinical improvement which was comparable with various other studies. Based on results published by various other studies, therapeutic plasma exchange is a comparatively safe and effective procedure

Constitutive expression of SMAR1 confers susceptibility to Mycobacterium tuberculosis infection in a transgenic mouse model.

Background & objectives: Studies involving animal models of experimental tuberculosis have elucidated the predominant role of cytokines secreted by T cells and macrophages to be an essential component of the immune response against Mycobacterium tuberculosis infection. The immune activities of CD4+ T cells are mediated in part by Th1 cytokine interferon gamma (IFN-γ) which is produced primarily by T cells and natural killer (NK) cells and critical for initiating the immune response against intracellular pathogen such as M. tuberculosis. Nuclear matrix protein SMAR1 plays an important role in V(D)J recombination, T helper cell differentiation and inflammatory diseases. In this study a transgenic mouse model was used to study the role of SMAR1 in M. tuberculosis infection. Methods: Wild type BALB/c, C57BL/6, BALB/c-EGFP-SMAR1 and C57BL/6-SMAR1 transgenic mice were infected with M. tuberculosis (H37Rv). A dose of 100 bacilli was used for infection via respiratory route. Bacterial load in lung and spleen of infected mice was determined at 2, 4, 6 and 8 wk post-infection. Gene expression analysis for Th1 cytokines and inducible nitric oxide synthase (iNOS) was performed in infected lung tissues by quantitative reverse transcription (RT)-PCR. Results: SMAR1 transgenic mice from both BALB/c and C57BL/6 genetic background displayed higher bacillary load and susceptibility to M. tuberculosis infection compared to wild type mice. This susceptibility was attributed due to compromised of Th1 response exhibited by transgenic mice. Interpretation & conclusions: SMAR1 transgenic mice exhibited susceptibility to M. tuberculosis infection in vivo irrespective of genetic background. This susceptibility was attributed to downregulation of Th1 response and its hallmark cytokine IFN-γ. Hence, SMAR1 plays an important role in modulating host immune response after M. tuberculosis infection.

Reduction in morbidity and mortality from childhood diarrhoeal disease after species A rotavirus vaccine introduction in Latin America : a review

Countries in Latin America were among the first to implement routine vaccination against species A rotavirus (RVA). We evaluate data from Latin America on reductions in gastroenteritis and RVA disease burden following the introduction of RVA vaccine. Published literature was reviewed to identify case-control studies of vaccine effectiveness and population-based studies examining longitudinal trends of diarrhoeal disease reduction after RVA vaccine introduction in Latin American countries. RVA vaccine effectiveness and impact on gastroenteritis mortality and hospitalization rates and RVA hospitalization rates are described. Among middle-income Latin American countries with published data (Mexico, Brazil, El Salvador and Panama), RVA vaccine contributed to a gastroenteritis-associated mortality reduction of 22-41 percent, a gastroenteritis-associated hospitalization reduction of 17-51 percent and a RVA hospitalization reduction of 59-81 percent among children younger than five years of age. In Brazil and El Salvador, case-control studies demonstrated that a full RVA vaccination schedule was 76-85 percent effective against RVA hospitalization; a lower effectiveness of 46 percent was seen in Nicaragua, the only low-income country with available data. A growing body of literature offers convincing evidence of "real world" vaccine program successes in Latin American settings, which may be expanded as more countries in the region include RVA vaccine in their immunization programs.