Thesis (MNutr (Human Nutrition))--University of Stellenbosch, 2006. / INTRODUCTION: The primary objective was to determine whether acidified formulae (pH 3.5 and 4.5) decreased gastric and tracheal colonisation, as well as microbial contamination of the enteral feeding delivery system, compared with a non-acidified control formula (pH 6.8) in critically ill patients. Secondary objectives included tolerance of the trial formulae and mortality in relation to the administration of acidified formulas. DESIGN: The trial was a controlled, double-blinded, randomised clinical trial of three parallel groups at a single centre. METHOD: Sixty-seven mechanically ventilated, medical and surgical critically ill patients were randomised according to their APACHE II scores and included in the trial. Patients received either an acidified (pH 3.5 or 4.5) or control polymeric enteral formula via an 8-Fr nasogastric tube at a continuous rate. Daily samples were taken for microbiologic analyses of the enteral formulae at various stages of reconstitution and at 6-hour and 24-hour intervals during administration thereof (feeding bottle and delivery set). Daily patient samples included nasogastric and tracheal aspirates, haematological evaluation and gastro-intestinal tolerance. The trial period terminated when patients were extubated, transferred from the ICU, enteral nutrition became contraindicated, a patient died, or for a maximum of 21 days. RESULTS: Gastric pH showed no significant difference (p = 0.86) between the 3 feeding groups [pH 3.5 (n = 23), pH 4.5 (n = 23) and pH 6.8 (n = 21)] at baseline prior to the administration of enteral formulae. After initiation of feeds, the gastric pH decreased significantly (p< 0.0001) in the acidified formulae as compared to the control formula during the trial period. Patients who received acidified enteral formulae (pH 3.5 and 4.5) had significantly less (p < 0.0001) contamination from the feeding bottles and delivery systems in respect of Enterobacteriacea, and Enterococcus., The more acidified group (pH 3.5) showed significantly less gastric contamination (p = 0.029) with Enterobacteriacea, , but not for fungi. The 3.5 acidified group also had the lowest gastric growth in terms of colony counts (≤104) of these organisms, but not for fungi, when compared to the control group (≤105). Vomiting episodes were 22% and abdominal distension 12%, with a higher incidence in the control group. Adverse events occurred equally between the groups with a higher, but not significantly different incidence of 37% in the control group and 32% for the acidified groups. There was no evidence of gastro-intestinal bleeding in any patient. Overall, the mortality rate in this trial was 6%, with 6.5% for the acidified groups (n=46) and 4.8% for the control group (n=21), a statistically insignificant difference. CONCLUSION: Acidified enteral formulae significantly decrease gastric colonisation by preserving gastric acidity that decreases the growth of Enterobacteriaceaes organisms. Acidified formulae significantly decrease bacterial contamination of the enteral feeding system (bottle and delivery set) of Enterobacteriaceae and Enterococcus organisms. Acidified formulae are tolerated well in critically ill patients.

Bakgrund: Vårdrelaterade infektioner är ett stort problem inom dagens sjukvård och en av de vanligaste vårdrelaterade infektionerna inom intensivvården är kateterrelaterade. En central venkateter (CVK) är en kärlaccess som är vanligt förekommande inom intensivvården och handhavandet av dessa utförs till största del av sjuksköterskan. Sjuksköterskans förebyggande arbete är därför viktigt för att minska förekomsten av CVK-relaterade infektioner samt öka patientsäkerheten. Syfte: Syftet med litteraturstudien var att beskriva vilka CVK-relaterade åtgärder utförda av sjuksköterskor hos vuxna patienter inom intensivvård som minskar risken för vårdrelaterade infektioner. Metod: En strukturerad litteraturstudie som sammanställt kvantitativ forskning med en induktiv innehållsanalys. Antal studier som inkluderades i resultatet var 18 stycken. Huvudresultat: Litteraturstudiens huvudresultat baserades på fem teman, samtliga beskrev preventiva omvårdnadsåtgärder. Resultatet inom respektive tema var vikten av mekanisk rengöring med desinfektionsmedel av injektionsportar och trevägskranar, daglig utvärdering av patientens behov av en CVK, en klorhexidinkomponent i förbandet, daglig helkroppsavtvättning med tvättlappar innehållande klorhexidin samt utbildning av personalen kring evidensbaserade riktlinjer. Samtliga dessa områden sågs minska risken och förekomsten av CVK-relaterade infektioner. Slutsats: Det är angeläget att det finns sjukhusövergripande riktlinjer som baseras på den bästa tillgängliga evidensen i syfte att minska CVK-relaterade infektioner inom intensivvården. Dessa bör vara samstämmiga med de nationellt övergripande riktlinjerna. Detta för att skapa en så jämlik och patientsäker vård som möjligt. / Introduction: Healthcare-related infections are a major problem in today's healthcare and one of the most common care related infections in the intensive care unit is catheter related. A central venous catheter (CVC) is a vascular access commonly found in intensive care units, and the maintenance is commonly performed by the nurses. The preventive work is therefore important in reducing the incidence of CVC-related infections and by that increasing the patient safety.   Aim: The aim of the study was to describe what part of maintenance regarding the CVC performed by nurses in adult patients in the intensive care unit that reduces the risk of healthcare-related infections. Method: A structured literature study was conducted and studies with a quantitative design were compiled. The results were analyzed with an inductive content analysis. The number of articles included in the results were 18. Main results: The main results of the study were based on five themes which were preventive measures. The results were mechanical cleaning with disinfectants of needleless connectors and three-way stop cork, daily evaluation of the patients need for a CVC, chlorhexidine dressing, daily chlorhexidine baths and education of staff. These areas were seen to reduce the risk and incidence of CVC-related infections. Conclusion: It is important that there is a consensus of the guidelines regarding the preventions of CVC-related infections both locally and nationally. The guidelines should be based on the best available evidence to reduce CVC-related infections in the intensive care unit. The purpose is to perform equal care and to promote patient safety.

Submitted by Socorro Pontes (socorrop@ufersa.edu.br) on 2017-06-27T14:12:56Z No. of bitstreams: 1 MariaAPM_TESE.pdf: 1410008 bytes, checksum: 318254107a5abb762d1ab3ce39d90c0d (MD5) / Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2017-06-27T14:26:06Z (GMT) No. of bitstreams: 1 MariaAPM_TESE.pdf: 1410008 bytes, checksum: 318254107a5abb762d1ab3ce39d90c0d (MD5) / Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2017-06-27T14:26:33Z (GMT) No. of bitstreams: 1 MariaAPM_TESE.pdf: 1410008 bytes, checksum: 318254107a5abb762d1ab3ce39d90c0d (MD5) / Made available in DSpace on 2017-06-27T14:26:40Z (GMT). No. of bitstreams: 1 MariaAPM_TESE.pdf: 1410008 bytes, checksum: 318254107a5abb762d1ab3ce39d90c0d (MD5) Previous issue date: 2017-03-03 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Haemorrhagic shock is an important cause of death and its reversal and treatment can help patients, furthermore it can minimize deleterious effects. Significant loss of the intravascular volume causes haemodynamic instability with decrease of tissue perfusion and cellular hypoxia and the reversal and treatment of shock increase the survival of patients and decreases deleterious effects of acute haemorrhage. Volume expandors can bring benefits and increase the survival of an individual. Synthetic substances can change the prognosis and reverse the clinical outcome in situations where there are neither blood bags nor donor available. Lactated Ringer and Hydroxyethylamide are solutions with biochemical and molecular features advantageous in the first stages of hemorrhagic shock treatment. Despite these features, more studies are necessary to determine their real benefits and deleterious effects. Evaluation of physiological parameters helps intensive care specialists monitoring patients in acute blood loss, and focused assessed transthoracic echocardiography is considered important tool in shock prevention or diagnosis. In this area, research is often carried out on small ruminants once they are considered more suitable for clinical evaluation and elaboration of treatment strategies. Goats can be considered a good experimental model, however data related to cardiovascular evaluation under haemorrhagic shock are still rare in this species. Thus to obtain more information to apply across different species (in veterinary and human medicine), this study aimed to describe anatomic and funcional features of heart and vessels in goats using transthoracic echocardiographic exam and to compare effects of Hydroxyethylamide and Lactated Ringer’s solution during volume replacement following experimental hemorrhagic shock in goats / Choque hemorrágico é uma importante causa de morte e tanto sua reversão quanto tratamento podem auxiliar pacientes, revertendo ou minimizando os efeitos deletérios desta condição. A perda significativa de volume intravascular provoca instabilidade hemodinâmica com diminuição da perfusão tecidual e hipoxia celular comprometendo gravemente as funções orgânicas. O uso de expansores volêmicos podem trazer benefícios e as substâncias sintéticas podem alterar o prognóstico e reverter o estado clínico em situações onde não há sangue nem doadores disponíveis. Ringer lactato e hidroxietilamido são soluções com características bioquímicas e moleculares vantajosas para serem utilizadas nos primeiros estágios do tratamento de choque hemorrágico; no entanto, mais estudos são necessários para determinar seus reais benefícios e efeitos deletérios. A avaliação da função cardíaca através da ecocardiografia auxilia na monitoração de pacientes com perda aguda de sangue sendo uma ferramenta essencial na prevenção e diagnóstico do choque. Nesse contexto, pesquisas são muitas vezes realizadas em pequenos ruminantes por serem considerados mais adequados para a avaliação clínica e elaboração de estratégias de tratamento e apesar da espécie caprina ser considerada um bom modelo experimental, dados relacionados à avaliação cardiovascular sob choque hemorrágico ainda são raros nesta espécie. Desta maneira, este estudo teve como objetivo descrever as características anatômicas e funcionais do coração de caprinos utilizando o exame ecocardiográfico transtorácico além de comparar os efeitos da reposição volêmica utilizando-se Hidroxietilamido a 6% e solução de Ringer com Lactato após choque hemorrágico experimental nesta espécie / 2017-06-27

Burnout is reflected in pathological emotional depletion and maladaptive detachment that is a secondary result of exposure prolonged occupational stress. It is comprised of three dimensions, namely, emotional exhaustion, depersonalization and reduced personal accomplishment. It is becoming increasingly recognized as one of the most serious occupational hazards for nurses who work in critical care units. The objectives of this study are to assess the prevalence of burnout among a sample of nurses who worked in the critical care units in a particular hospital in Kenya, to analyze factors that contributed to the development of burnout and to identify measures for the mitigation of burnout. For this study, the researcher utilized a mixed methods research design in two phases. Phase one assessed the prevalence of burnout in nurses working in the critical care units by making use of the Maslach Burnout Inventory – Human Services Survey. Focus groups discussions were then held in Phase two to investigate the factors that the nurses perceived as the main causes of burnout and to solicit their ideas about it could be mitigated. Convenience sampling and purposive sampling were used in the two phases of the study respectively. / Health Studies / M.A. (Health Studies)

The purpose of this study was to explore and describe the knowledge that a cohort of 40 intensive care unit nurses had of evidence-based practice. It was assumed that they lacked the knowledge to locate, evaluate understand and apply research findings. Quantitative, non-experimental descriptive research was conducted to explore their knowledge and to formulate recommendations for promoting it. Data collection involved administering a structured questionnaire administered to the cohort in an intensive care unit. The findings revealed that, although they were familiar with the basic concept of evidence-based practice, they were reluctant and lacked the skills to adopt it in their practice. It is recommended that they be trained and empowered to develop research expertise from within their own ranks. Finally it is recommended that nursing management should play a more proactive role in identifying cost-effective strategies in overcoming barriers to finding, promoting and integrating evidence-based practice / Health Studies / M.A. (Health Studies)

A Confusão Aguda é um diagnóstico de enfermagem (DE) frequentemente estabelecido nas Unidades de Terapia Intensivas (UTI) devido à elevada incidência de delirium, 21% a 73% dos pacientes críticos. Ainda, desencadeia importante declínio funcional, maior morbidade, mortalidade, período de internação, tempo de ventilação mecânica e custos. Assim, este estudo objetivou desenvolver e validar um protocolo multiprofissional para manejo de pacientes com o DE Confusão Aguda relacionado ao delirium internados em UTI a partir das evidências encontradas na literatura e na Classificação das Intervenções de Enfermagem (NIC). O estudo foi composto de três etapas: elaboração de uma revisão integrativa (RI) para a identificação das evidências no que tange aos cuidados para delirium, a seguir foi realizado o mapeamento cruzado entre estas e as intervenções da NIC. A segunda etapa foi à construção do protocolo com os cuidados identificados e, por fim, a validação de conteúdo pelos peritos, sendo considerados validados cuidados com índice de validade de conteúdo (IVC) ≥ 0,90. No desenvolvimento da RI foram encontrados 17 artigos originais. Os cuidados identificados na RI foram relacionados a duas intervenções e quatro atividades da NIC, dentre as prioritárias, 10 intervenções e 28 atividades nas sugeridas e quatro intervenções e oito atividades nas essenciais. Nenhuma intervenção opcional foi mapeada. Dos 48 cuidados selecionados a partir da RI e mapeamento cruzado, os quais foram submetidos à validação de conteúdo, apenas quatro não obtiveram consenso pelo IVC. O protocolo multiprofissional de cuidados validado pelos peritos para pacientes com DE Confusão Aguda relacionado ao delirium internados em UTI englobou cuidados referentes ao diagnóstico de delirium, pausa de sedação e mobilização precoce (segundo o bundle ABCDE), diretrizes para dor, agitação e delirium, agitação psicomotora, orientação cognitiva, promoção do sono, ambiente e participação da família. A partir da construção do protocolo assistencial proposto é esperado qualificar a assistência prestada ao paciente crítico em delirium. No entanto, ainda são necessárias mais pesquisas a fim de determinar evidências mais robustas dos cuidados farmacológicos e não farmacológicos. / Acute Confusion is a nursing diagnosis (ND) frequently established in Intensive Care Units (ICU) due to the high incidence of delirium, 21% to 73% of critical patients. Still, it triggers important functional decline, higher morbidity, mortality, period of hospitalization, time in mechanical ventilation and costs. Thus, this study was aimed to develop and validate a health care protocol to manage patients with the ND of Acute Confusion related to delirium and hospitalized in the ICU, from the evidences found in the literature and Nursing Interventions Classification (NIC). The study was composed by three phases: elaboration of an integrative review (IR) to identifying the evidences in what concerns delirium care. Following to that, a cross-mapping was made between those and the NIC interventions. The second phase was the construction of a protocol with the identified care, and finally the validation per content by the experts, being considered validated care the ones with content validity index (CVI) ≥ 0.90. In the development of the IR, 17 original articles were found. The care identified at IR were related to two interventions and four activities of the NIC, among the priorities, 10 interventions and 28 activities in the suggested ones, and 4 interventions and 8 essential activities. No optional intervention was mapped. Of the 48 care selected from IR and crossmapping, which were submitted to content validation, only four did not obtain consensus by the CVI. The health care protocol validated by the experts for patients with the ND of Acute Confusion related to delirium hospitalized in the ICU encompassed care referent to the diagnosis of delirium. These are pause in sedation and early mobilization (according to bundle ABCDE), orientation for pain, agitation and delirium, psychomotor agitation, cognitive orientation, sleep promotion, environment and family participation. From the construction of the proposed health care protocol, qualifying the assistance to the critical patient under delirium is expected. However, more researches are necessary in order to determine robust evidences in the pharmacological and non-pharmacological care.

Base teórica: Existem controvérsias quanto à quantidade ideal de calorias que pacientes críticos com insuficiência respiratória aguda devem receber, bem como aos efeitos das estratégias de terapia nutricional hipocalórica versus normocalórica nos desfechos clínicos e de tolerância gastrointestinal. Objetivo: Comparar o efeito de duas estratégias de terapia nutricional enteral (nutrição hipocalórica versus normocalórica) nos desfechos clínicos e na tolerância gastrointestinal de pacientes criticamente doentes em insuficiência respiratória aguda. Bases de dados pesquisadas: MEDLINE, EMBASE, SCOPUS e Cochrane Central Register of Controlled Trials até o período de agosto de 2014. Seleção dos estudos: Ensaios clínicos randomizados que compararam o efeito das estratégias de nutrição hipocalórica versus normocalórica nos desfechos clínicos principais [mortalidade na unidade de terapia intesiva (UTI), tempo de internação na UTI e tempo de ventilação mecânica] e nos sinais e sintomas gastrointestinais (regurgitação, aspiração, vômito, diarreia, constipação, distensão abdominal, elevado volume de resíduo gástrico e uso de agentes prócinéticos). Extração dos dados: Informações sobre a execução e qualidade dos estudos e características dos pacientes e dos desfechos de interesse foram extraídas. As estimativas de risco relativo (RR) e média da diferença (MD) foram sintetizadas sob o modelo de efeitos aleatórios. A heterogeneidade foi avaliada com Teste Q e I2. A análise de sensibilidade foi conduzida através de análise de subgrupos os quais foram classificados conforme a estratégia de terapia nutricional enteral utilizada (nutrição trófica versus nutrição hipocalórica moderada). A metanálise foi realizada com apoio do software RevMan v5.3. Resultados: Dentre os 798 estudos encontrados, quatro ensaios clínicos randomizados que avaliaram 1540 pacientes foram incluídos na avaliação qualitativa e quantitativa. Não houve diferença na mortalidade geral (RR, 0.92; 95% CI, 0.73 – 1,19; I2 31% p=0.23 para heterogeneidade). A análise de subgrupos verificou mortalidade geral significativamente menor no subgrupo que recebeu 59-72% das necessidades nutricionais (RR, 0.72; 95% CI, 0.53 – 0.98; I2 0% p=0.78 para heterogeneidade). Não foram encontradas diferenças entre os grupos quanto à mortalidade na UTI, tempo de permanência na UTI ou hospitalar e tempo de ventilação mecânica. Quanto à avaliação da tolerância gastrointestinal, o grupo que recebeu nutrição hipocalórica foi associado a uma menor ocorrência de vômitos, diarreia e constipação quando comparado ao grupo nutrição normocalórica. Não foram verificadas diferenças entre os grupos quanto aos sintomas de aspiração e distensão abdominal. Conclusão: A estratégia de terapia nutricional enteral hipocalórica em aporte moderado (59- 72%) foi associada à menor mortalidade geral. A tolerância gastrointestinal foi superior no grupo que recebeu nutrição hipocalórica. A oferta de terapia nutricional enteral hipocalórica em aporte moderado deve ser preferida em pacientes criticamente doentes. / Context: Controversy exists regarding the optimal amount of calories that critically ill patients with acute respiratory failure should consume as far as clinical outcomes and gastrointestinal tolerability are concerned. Objective: To compare the effect of two enteral nutrition strategies (underfeeding versus fullfeeding) on clinical outcomes and gastrointestinal tolerability in critically ill patients with acute respiratory failure. Data Sources: MEDLINE, EMBASE, SCOPUS and the Cochrane Central Register of Controlled Trials up to August 2014. Study Selection: Randomized Controlled Trials that compared the effects of underfeeding with full-feeding strategies on major clinical outcomes (ICU and overall mortality, ICU and hospital length of stay and mechanical ventilation) and gastrointestinal signs and symptoms (regurgitation, aspiration, vomiting, diarrhea, constipation, abdominal distention, elevated gastric residual volume and use of prokinetic agents). Data extraction: Studies’ information, patient’s characteristics and outcomes were extracted. Risk ratio (RR) and Mean Difference (MD) estimates were synthesized under a randomeffects model. Heterogeneity was evaluated using the Q test and I2. A sensitivity analysis on overall mortality was conducted, wherein the groups were classified according to the feeding strategy used (trophic versus hypocaloric nutrition). Meta-analyses were performed using RevMan v5.3 analysis software. Data synthesis: Among the 798 studies retrieved, four studies of 1540 patients were included. Interventional studies comparing underfeeding with full-feeding were not associated with significant difference in overall mortality (RR, 0.92; 95% CI, 0.73 – 1,19; I2 31% p=0.23 for heterogeneity). Subgroup analysis of the groups according to the amount of delivered calories showed that the overall mortality was significantly lower in the subgroup that achieved 59-72% of energy intake than in the full-feeding group (RR, 0.72; 95% CI, 0.53 – 0.98; I2 0% p=0.78 for heterogeneity). No differences were found between the underfeeding versus full-feeding groups regarding in the ICU mortality, ICU and hospital length of stay and duration of mechanical ventilation. As far as gastrointestinal tolerability is concerned, the underfeeding group showed lower occurrence of vomiting, regurgitation, use of prokinetic agents, elevated gastric residual volume occurrence, diarrhea and constipation when compared with the full-feeding strategy. No differences between the two groups were found for aspiration and abdominal distention. Conclusion: The underfeeding strategy was associated with lower overall mortality in the subgroup that achieved initial moderate intake. Gastrointestinal tolerability was improved by the underfeeding strategy. Initial moderate intake should be preferred rather than trophic or full-feeding in critically ill patients.

A Confusão Aguda é um diagnóstico de enfermagem (DE) frequentemente estabelecido nas Unidades de Terapia Intensivas (UTI) devido à elevada incidência de delirium, 21% a 73% dos pacientes críticos. Ainda, desencadeia importante declínio funcional, maior morbidade, mortalidade, período de internação, tempo de ventilação mecânica e custos. Assim, este estudo objetivou desenvolver e validar um protocolo multiprofissional para manejo de pacientes com o DE Confusão Aguda relacionado ao delirium internados em UTI a partir das evidências encontradas na literatura e na Classificação das Intervenções de Enfermagem (NIC). O estudo foi composto de três etapas: elaboração de uma revisão integrativa (RI) para a identificação das evidências no que tange aos cuidados para delirium, a seguir foi realizado o mapeamento cruzado entre estas e as intervenções da NIC. A segunda etapa foi à construção do protocolo com os cuidados identificados e, por fim, a validação de conteúdo pelos peritos, sendo considerados validados cuidados com índice de validade de conteúdo (IVC) ≥ 0,90. No desenvolvimento da RI foram encontrados 17 artigos originais. Os cuidados identificados na RI foram relacionados a duas intervenções e quatro atividades da NIC, dentre as prioritárias, 10 intervenções e 28 atividades nas sugeridas e quatro intervenções e oito atividades nas essenciais. Nenhuma intervenção opcional foi mapeada. Dos 48 cuidados selecionados a partir da RI e mapeamento cruzado, os quais foram submetidos à validação de conteúdo, apenas quatro não obtiveram consenso pelo IVC. O protocolo multiprofissional de cuidados validado pelos peritos para pacientes com DE Confusão Aguda relacionado ao delirium internados em UTI englobou cuidados referentes ao diagnóstico de delirium, pausa de sedação e mobilização precoce (segundo o bundle ABCDE), diretrizes para dor, agitação e delirium, agitação psicomotora, orientação cognitiva, promoção do sono, ambiente e participação da família. A partir da construção do protocolo assistencial proposto é esperado qualificar a assistência prestada ao paciente crítico em delirium. No entanto, ainda são necessárias mais pesquisas a fim de determinar evidências mais robustas dos cuidados farmacológicos e não farmacológicos. / Acute Confusion is a nursing diagnosis (ND) frequently established in Intensive Care Units (ICU) due to the high incidence of delirium, 21% to 73% of critical patients. Still, it triggers important functional decline, higher morbidity, mortality, period of hospitalization, time in mechanical ventilation and costs. Thus, this study was aimed to develop and validate a health care protocol to manage patients with the ND of Acute Confusion related to delirium and hospitalized in the ICU, from the evidences found in the literature and Nursing Interventions Classification (NIC). The study was composed by three phases: elaboration of an integrative review (IR) to identifying the evidences in what concerns delirium care. Following to that, a cross-mapping was made between those and the NIC interventions. The second phase was the construction of a protocol with the identified care, and finally the validation per content by the experts, being considered validated care the ones with content validity index (CVI) ≥ 0.90. In the development of the IR, 17 original articles were found. The care identified at IR were related to two interventions and four activities of the NIC, among the priorities, 10 interventions and 28 activities in the suggested ones, and 4 interventions and 8 essential activities. No optional intervention was mapped. Of the 48 care selected from IR and crossmapping, which were submitted to content validation, only four did not obtain consensus by the CVI. The health care protocol validated by the experts for patients with the ND of Acute Confusion related to delirium hospitalized in the ICU encompassed care referent to the diagnosis of delirium. These are pause in sedation and early mobilization (according to bundle ABCDE), orientation for pain, agitation and delirium, psychomotor agitation, cognitive orientation, sleep promotion, environment and family participation. From the construction of the proposed health care protocol, qualifying the assistance to the critical patient under delirium is expected. However, more researches are necessary in order to determine robust evidences in the pharmacological and non-pharmacological care.

Base teórica: Existem controvérsias quanto à quantidade ideal de calorias que pacientes críticos com insuficiência respiratória aguda devem receber, bem como aos efeitos das estratégias de terapia nutricional hipocalórica versus normocalórica nos desfechos clínicos e de tolerância gastrointestinal. Objetivo: Comparar o efeito de duas estratégias de terapia nutricional enteral (nutrição hipocalórica versus normocalórica) nos desfechos clínicos e na tolerância gastrointestinal de pacientes criticamente doentes em insuficiência respiratória aguda. Bases de dados pesquisadas: MEDLINE, EMBASE, SCOPUS e Cochrane Central Register of Controlled Trials até o período de agosto de 2014. Seleção dos estudos: Ensaios clínicos randomizados que compararam o efeito das estratégias de nutrição hipocalórica versus normocalórica nos desfechos clínicos principais [mortalidade na unidade de terapia intesiva (UTI), tempo de internação na UTI e tempo de ventilação mecânica] e nos sinais e sintomas gastrointestinais (regurgitação, aspiração, vômito, diarreia, constipação, distensão abdominal, elevado volume de resíduo gástrico e uso de agentes prócinéticos). Extração dos dados: Informações sobre a execução e qualidade dos estudos e características dos pacientes e dos desfechos de interesse foram extraídas. As estimativas de risco relativo (RR) e média da diferença (MD) foram sintetizadas sob o modelo de efeitos aleatórios. A heterogeneidade foi avaliada com Teste Q e I2. A análise de sensibilidade foi conduzida através de análise de subgrupos os quais foram classificados conforme a estratégia de terapia nutricional enteral utilizada (nutrição trófica versus nutrição hipocalórica moderada). A metanálise foi realizada com apoio do software RevMan v5.3. Resultados: Dentre os 798 estudos encontrados, quatro ensaios clínicos randomizados que avaliaram 1540 pacientes foram incluídos na avaliação qualitativa e quantitativa. Não houve diferença na mortalidade geral (RR, 0.92; 95% CI, 0.73 – 1,19; I2 31% p=0.23 para heterogeneidade). A análise de subgrupos verificou mortalidade geral significativamente menor no subgrupo que recebeu 59-72% das necessidades nutricionais (RR, 0.72; 95% CI, 0.53 – 0.98; I2 0% p=0.78 para heterogeneidade). Não foram encontradas diferenças entre os grupos quanto à mortalidade na UTI, tempo de permanência na UTI ou hospitalar e tempo de ventilação mecânica. Quanto à avaliação da tolerância gastrointestinal, o grupo que recebeu nutrição hipocalórica foi associado a uma menor ocorrência de vômitos, diarreia e constipação quando comparado ao grupo nutrição normocalórica. Não foram verificadas diferenças entre os grupos quanto aos sintomas de aspiração e distensão abdominal. Conclusão: A estratégia de terapia nutricional enteral hipocalórica em aporte moderado (59- 72%) foi associada à menor mortalidade geral. A tolerância gastrointestinal foi superior no grupo que recebeu nutrição hipocalórica. A oferta de terapia nutricional enteral hipocalórica em aporte moderado deve ser preferida em pacientes criticamente doentes. / Context: Controversy exists regarding the optimal amount of calories that critically ill patients with acute respiratory failure should consume as far as clinical outcomes and gastrointestinal tolerability are concerned. Objective: To compare the effect of two enteral nutrition strategies (underfeeding versus fullfeeding) on clinical outcomes and gastrointestinal tolerability in critically ill patients with acute respiratory failure. Data Sources: MEDLINE, EMBASE, SCOPUS and the Cochrane Central Register of Controlled Trials up to August 2014. Study Selection: Randomized Controlled Trials that compared the effects of underfeeding with full-feeding strategies on major clinical outcomes (ICU and overall mortality, ICU and hospital length of stay and mechanical ventilation) and gastrointestinal signs and symptoms (regurgitation, aspiration, vomiting, diarrhea, constipation, abdominal distention, elevated gastric residual volume and use of prokinetic agents). Data extraction: Studies’ information, patient’s characteristics and outcomes were extracted. Risk ratio (RR) and Mean Difference (MD) estimates were synthesized under a randomeffects model. Heterogeneity was evaluated using the Q test and I2. A sensitivity analysis on overall mortality was conducted, wherein the groups were classified according to the feeding strategy used (trophic versus hypocaloric nutrition). Meta-analyses were performed using RevMan v5.3 analysis software. Data synthesis: Among the 798 studies retrieved, four studies of 1540 patients were included. Interventional studies comparing underfeeding with full-feeding were not associated with significant difference in overall mortality (RR, 0.92; 95% CI, 0.73 – 1,19; I2 31% p=0.23 for heterogeneity). Subgroup analysis of the groups according to the amount of delivered calories showed that the overall mortality was significantly lower in the subgroup that achieved 59-72% of energy intake than in the full-feeding group (RR, 0.72; 95% CI, 0.53 – 0.98; I2 0% p=0.78 for heterogeneity). No differences were found between the underfeeding versus full-feeding groups regarding in the ICU mortality, ICU and hospital length of stay and duration of mechanical ventilation. As far as gastrointestinal tolerability is concerned, the underfeeding group showed lower occurrence of vomiting, regurgitation, use of prokinetic agents, elevated gastric residual volume occurrence, diarrhea and constipation when compared with the full-feeding strategy. No differences between the two groups were found for aspiration and abdominal distention. Conclusion: The underfeeding strategy was associated with lower overall mortality in the subgroup that achieved initial moderate intake. Gastrointestinal tolerability was improved by the underfeeding strategy. Initial moderate intake should be preferred rather than trophic or full-feeding in critically ill patients.

Este estudo trata-se de uma revisão sistemática da literatura e tem como referencial teórico a prática baseada em evidência. Buscou-se identificar e analisar na literatura evidências oriundas de ensaios clínicos controlados e randomizados sobre os cuidados relacionados à aspiração de secreções endotraqueais em pacientes adultos, em estado crítico, intubados e sob ventilação mecânica. Os passos metodológicos desta revisão foram guiados pelas recomendações da Colaboração Cochrane. A busca foi realizada nas bases de dados PUBMED, EMBASE, CENTRAL, CINAHL e LILACS. Das 631 referências encontradas, 17 estudos foram selecionados após a análise dos títulos e resumos. Foi realizada a extração dos dados e análise do risco de viés por dois revisores, para cada estudo selecionado. Os 17 estudos foram publicados no período de 1987 à 2009. Ao todo, foram investigados 2.890 pacientes adultos, intubados e sob ventilação mecânica. Foram encontradas evidências quanto a seis categorias de intervenções relacionadas à aspiração endotraqueal: aspiração endotraqueal baseada em pesquisa x aspiração endotraqueal usual, em um estudo; aspiração endotraqueal de rotina x aspiração endotraqueal minimamente invasiva, em dois estudos; aspiração endotraqueal de sistema aberto x aspiração endotraqueal de sistema fechado, em oito estudos; troca do sistema fechado em 24 horas x 48 horas, em dois estudos; troca diária do sistema fechado x troca não rotineira, em um estudo; e instilação de soro fisiológico x não instilação de soro fisiológico, em três estudos. As intervenções foram realizadas analisando desfechos referentes a alterações hemodinâmicas, alterações dos gases sanguíneos, colonização microbiana e infecção nosocomial, e outros desfechos. Foram encontradas evidências relevantes quanto à prática da aspiração endotraqueal, entretanto, as limitações metodológicas e riscos de viés encontrados nos estudos selecionados reduzem a confiabilidade de tais evidências, demonstrando a necessidade de estudos futuros. Também, foi observada a necessidade da realização de ECCRs que contemplem os demais passos da aspiração endotraqueal e desfechos. / This systematic review of literature used the evidence-based practice as the theoretical framework. This study aimed to identify and analyze in the literature the evidence of randomized controlled trials on care related to the endotracheal secretions suctioning in critically ill adult patients who were intubated and undergoing mechanical ventilation. The methodological steps were guided by the recommendations of the Cochrane Collaboration. The search was conducted in the PUBMED, EMBASE, CENTRAL, CINAHL and LILACS databases. Of the 631 found references, 17 studies were selected after the analysis of titles and abstracts. The data extraction and the analysis of the risk of bias by two reviewers for each selected study were performed. The 17 studies were published in the period from 1987 to 2009. In the total, 2,890 adult patients who were intubated and undergoing mechanical ventilation were investigated. Evidences for six categories of interventions related to endotracheal suction were found: research-based endotracheal suction x usual endotracheal suction, in one study; routine endotracheal suction x minimally invasive endotracheal suction, in two studies; open endotracheal suction system x closed endotracheal suction system, in eight studies; change of closed system in 24 hours x 48 hours, in two studies; daily change of closed system x non-routine change, in one study; and instillation of saline x non-instillation of saline, in three studies. The interventions were performed through the analysis of outcomes related to hemodynamic alterations, blood gas alterations, microbial colonization and nosocomial infection, and other outcomes. Relevant evidences related to the practice of endotracheal suction were found; however, methodological limitations and risks of bias found in selected studies reduce the reliability of such evidences, demonstrating the need for further studies. Also, the need for the realization of ECCRs that address the remaining steps of endotracheal suction and outcomes were observed.