Burden of treatment in the light of the international classification of functioning, disability and health: a “best fit” framework synthesis

PURPOSE: This systematic literature review aimed to (1) summarize and explain the concept of Burden of Treatment (BoT) using the International Classification of Functioning, Disability and Health (ICF) terminology, and (2) inform the development of a future Comprehensive ICF Core Set for BoT. METHOD: Searches on EMbase, Medline, CINAHL and PsycINFO were conducted. Only qualitative studies were considered for inclusion. The screening and data extraction stages were followed by a "Best-fit" framework synthesis and content analysis, using the established ICF linking rules. Screening, data extraction, quality appraisal and data analysis were performed by two independent researchers. RESULTS: Seventeen studies were included in this review. The "Best-fit" framework synthesis generated 179 subthemes which identified that BoT impacts negatively on body functions and structures, restricts valued activities and participation and influences contextual factors through life roles, self-identify and relationships. The identified subthemes were linked to 77 ICF categories. CONCLUSIONS: This study is part of the preparatory phase of a Comprehensive ICF Core Set for BoT and our findings will inform the further needed studies on this phase. The use of ICF terminology to describe BoT provides an accessible route for understanding this complex concept, which is pivotal for rethinking clinical practice. Implications for rehabilitation Health professionals applying the ICF should consider the negative impact of interventions on patient's life roles and self-identity, body functions and structures and on valued activities and participation. Health professionals who may be concerned about the treatment burden being experienced by their patients can now use the ICF terminology to discuss this with the multidisciplinary team. Poor adherence to rehabilitation programs may be explained by an increased BoT. This phenomenon can now be mapped to the ICF, and coded using a framework well known by multidisciplinary teams

Malaria protection due to sickle haemoglobin depends on parasite genotype

Host genetic factors can confer resistance against malaria1, raising the question of whether this has led to evolutionary adaptation of parasite populations. Here we searched for association between candidate host and parasite genetic variants in 3,346 Gambian and Kenyan children with severe malaria caused by Plasmodium falciparum. We identified a strong association between sickle haemoglobin (HbS) in the host and three regions of the parasite genome, which is not explained by population structure or other covariates, and which is replicated in additional samples. The HbS-associated alleles include nonsynonymous variants in the gene for the acyl-CoA synthetase family member2-4 PfACS8 on chromosome 2, in a second region of chromosome 2, and in a region containing structural variation on chromosome 11. The alleles are in strong linkage disequilibrium and have frequencies that covary with the frequency of HbS across populations, in particular being much more common in Africa than other parts of the world. The estimated protective effect of HbS against severe malaria, as determined by comparison of cases with population controls, varies greatly according to the parasite genotype at these three loci. These findings open up a new avenue of enquiry into the biological and epidemiological significance of the HbS-associated polymorphisms in the parasite genome and the evolutionary forces that have led to their high frequency and strong linkage disequilibrium in African P. falciparum populations

Genetic structure of sigmodontine rodents (Cricetidae) along an altitudinal gradient of the Atlantic Rain Forest in southern Brazil

The population genetic structure of two sympatric species of sigmodontine rodents (Oligoryzomys nigripes and Euryoryzomys russatus) was examined for mitochondrial DNA (mtDNA) sequence haplotypes of the control region. Samples were taken from three localities in the Atlantic Rain Forest in southern Brazil, along an altitudinal gradient with different types of habitat. In both species there was no genetic structure throughout their distribution, although levels of genetic variability and gene flow were high

Alcoholism and Strongyloides stercoralis: Daily Ethanol Ingestion Has a Positive Correlation with the Frequency of Strongyloides Larvae in the Stools

It has been reported that Strongyloides stercoralis infection is more prevalent in chronic alcoholic patients than in non alcoholics living in the same country. In a retrospective study on the prevalence of S. stercoralis infection in a large sample of alcoholic patients, we demonstrate that this prevalence is significantly higher than in non-alcoholic patients admitted at the same hospital. Moreover, the frequency of the parasite was in close relationship with the daily amount of ingested ethanol, even in the absence of liver cirrhosis, reinforcing the idea that chronic alcoholism is associated with increased susceptibility to Strongyloides infection. Beside the bad hygiene profile of alcoholic patients, which explains high risk for acquisition of the parasite, the high prevalence of S. stercoralis in alcoholics may be in relationship with other effects of ethanol on the intestinal motility, steroid metabolism and immune system, which could enhance the chance of autoinfection and the survival and fecundity of females in duodenum. In this way, the number of larvae in the stools is higher in alcoholic patients, increasing the chance of a positive result in a stool examination by sedimentation method