Electrochemical polymerisation of phenol in aqueous solution on a Ta/PbO2 anode

This paper deals with the treatment of aqueous phenol solutions using an electrochemical technique. Phenol can be partly eliminated from aqueous solution by electrochemically initiated polymerisation. Galvanostatic electrolyses of phenol solutions at concentration up to 0.1 mol dm−3 were carried out on a Ta/PbO2 anode. The polymers formed are insoluble in acidic medium but soluble in alkaline. These polymers were filtered and then dissolved in aqueous solution of sodium hydroxide (1 mol dm−3). The polymers formed were quantified by total organic carbon (TOC) measurement. It was found that the conversion of phenol into polymers increases as a function of initial concentration, anodic current density, temperature, and solution pH. The percentage of phenol polymerised can reach 15%

Transplante cardíaco na doença de Chagas

Among the several etiologies of heart failure, the chagasic myocardiopathy is considered the most aggressive. Once there is no treatment capable of reverting the disease evolution, the heart transplantation becomes the only option. We analyzed 107 patients with Chagas disease submitted to heart transplantation, aged between 11 and 62 years (42.7 ± 15.3 years). Patients with symptomatic megacolon and megaesophagus are automatically excluded from transplant programs due to a higher possibility of postoperative short and long term complications. The expectation of inferior results for the transplantation of chagasic patients in comparison with other myocardiopathies was not confirmed and, paradoxically, were found better survival rates. We noticed an immediate mortality rated in 17.7% (19 cases), whose main cause of death were: infection (6 cases, 31.5%), graft dysfunction (6 cases, 31.5%), rejection (4 cases 21,1%), sudden cardiopulmonary arrest (2 cases 10.5%) and ABO incompatibilities (1 case 5,3%). Late after transplant, 27 (25.2%) patients died, and the major causes were: rejection (6 cases, 22.2%), infection (6 casos, 22.2%), lymphoma (4 cases, 14.8%), Kaposi sarcoma (2 cases, 7.4%), constrictive pericarditis (2 cases, 7.4%) and Chagas disease reactivation in the central nervous system (1 case, 7.1%). Finally, the conclusions are: 1) heart transplantation is still the only way to modify the natural course of chagasic myocardiopathy, 2) early diagnosis coupled to the rapid introduction of benzonidazol leads to a pattern recognition of normal myocardial histology without sequelae and 3) the doses of immunosuppressants used should be lower than those used in other etiologies.Dentre as diversas etiologias da insuficiência cardíaca, a miocardiopatia chagásica é considerada a mais agressiva. Como não há tratamento capaz de reverter a evolução da doença o transplante cardíaco torna-se a única opção. Foram analisados 107 pacientes portadores da doença de Chagas submetidos a transplante cardíaco, com idades compreendidas entre 11 e 62 anos (42,7±15,3 anos). Os pacientesportadores de megaesôfago e megacólon sintomáticos são automaticamente excluídos dos programas de transplante devido a uma maior possibilidade de complicações no pós-operatório a curto e longo prazo. A expectativa de resultados inferiores para o transplante em chagásicos em relação às demais cardiomiopatias não foi confirmada e, paradoxalmente, se encontram melhores taxas de sobrevida. Notou-se uma mortalidade imediata de 17,7% (19 casos), sendo as principais causas de morte: infecção (6 casos, 31,5%), disfunção do enxerto (6 casos, 31,5%), rejeição (4 casos 21,1%), parada cardiorrespiratória súbita (2 casos 10,5%) e incompatibilidades ABO (1 caso 5,3%). Tardiamente ao transplante, 27 (25,2%) pacientes morreram, sendo as principais causas de morte: rejeição (6 casos, 22,2%), infecção (6 casos, 22,2%), linfoma(4 casos, 14,8%), Kaposi (2 casos, 7,4%), pericardite constritiva (2 casos, 7,4%) e reativação da doença de Chagas no sistemanervoso central (1 caso, 7,1%). Por fim, pode-se concluir que: 1) o transplante cardíaco ainda é a única forma capaz de modificar a evolução natural da cardiomiopatia chagásica; 2) o diagnóstico precoce aliado à rápida introdução de benzonidazolleva a um reconhecimento de padrões histológicos normais do miocárdio sem que haja sequelas e 3) as doses de imunossupressores empregadas devem ser inferiores às utilizadas em outras etiologias

Prospective observational cohort study on grading the severity of postoperative complications in global surgery research

Background The Clavien–Dindo classification is perhaps the most widely used approach for reporting postoperative complications in clinical trials. This system classifies complication severity by the treatment provided. However, it is unclear whether the Clavien–Dindo system can be used internationally in studies across differing healthcare systems in high- (HICs) and low- and middle-income countries (LMICs). Methods This was a secondary analysis of the International Surgical Outcomes Study (ISOS), a prospective observational cohort study of elective surgery in adults. Data collection occurred over a 7-day period. Severity of complications was graded using Clavien–Dindo and the simpler ISOS grading (mild, moderate or severe, based on guided investigator judgement). Severity grading was compared using the intraclass correlation coefficient (ICC). Data are presented as frequencies and ICC values (with 95 per cent c.i.). The analysis was stratified by income status of the country, comparing HICs with LMICs. Results A total of 44 814 patients were recruited from 474 hospitals in 27 countries (19 HICs and 8 LMICs). Some 7508 patients (16·8 per cent) experienced at least one postoperative complication, equivalent to 11 664 complications in total. Using the ISOS classification, 5504 of 11 664 complications (47·2 per cent) were graded as mild, 4244 (36·4 per cent) as moderate and 1916 (16·4 per cent) as severe. Using Clavien–Dindo, 6781 of 11 664 complications (58·1 per cent) were graded as I or II, 1740 (14·9 per cent) as III, 2408 (20·6 per cent) as IV and 735 (6·3 per cent) as V. Agreement between classification systems was poor overall (ICC 0·41, 95 per cent c.i. 0·20 to 0·55), and in LMICs (ICC 0·23, 0·05 to 0·38) and HICs (ICC 0·46, 0·25 to 0·59). Conclusion Caution is recommended when using a treatment approach to grade complications in global surgery studies, as this may introduce bias unintentionally

Critical care admission following elective surgery was not associated with survival benefit: prospective analysis of data from 27 countries

This was an investigator initiated study funded by Nestle Health Sciences through an unrestricted research grant, and by a National Institute for Health Research (UK) Professorship held by RP. The study was sponsored by Queen Mary University of London

The surgical safety checklist and patient outcomes after surgery: a prospective observational cohort study, systematic review and meta-analysis

© 2017 British Journal of Anaesthesia Background: The surgical safety checklist is widely used to improve the quality of perioperative care. However, clinicians continue to debate the clinical effectiveness of this tool. Methods: Prospective analysis of data from the International Surgical Outcomes Study (ISOS), an international observational study of elective in-patient surgery, accompanied by a systematic review and meta-analysis of published literature. The exposure was surgical safety checklist use. The primary outcome was in-hospital mortality and the secondary outcome was postoperative complications. In the ISOS cohort, a multivariable multi-level generalized linear model was used to test associations. To further contextualise these findings, we included the results from the ISOS cohort in a meta-analysis. Results are reported as odds ratios (OR) with 95% confidence intervals. Results: We included 44 814 patients from 497 hospitals in 27 countries in the ISOS analysis. There were 40 245 (89.8%) patients exposed to the checklist, whilst 7508 (16.8%) sustained ≥1 postoperative complications and 207 (0.5%) died before hospital discharge. Checklist exposure was associated with reduced mortality [odds ratio (OR) 0.49 (0.32–0.77); P\u3c0.01], but no difference in complication rates [OR 1.02 (0.88–1.19); P=0.75]. In a systematic review, we screened 3732 records and identified 11 eligible studies of 453 292 patients including the ISOS cohort. Checklist exposure was associated with both reduced postoperative mortality [OR 0.75 (0.62–0.92); P\u3c0.01; I2=87%] and reduced complication rates [OR 0.73 (0.61–0.88); P\u3c0.01; I2=89%). Conclusions: Patients exposed to a surgical safety checklist experience better postoperative outcomes, but this could simply reflect wider quality of care in hospitals where checklist use is routine