The Southern African journal of critical care : the official journal of the Critical Care Society最新文献

Background: Accidental intraoperative hypothermia is a common and avoidable adverse event of the perioperative period and is associated with detrimental effects on multiple organ systems and postoperative patient outcomes. In a resource-limited environment, prevention of intraoperative hypothermia is often challenging. Resourceful clinicians overcome these challenges through creative devices and frugal innovations.

Objectives: To investigate the thermal performance of two Baragwanath Rewarming Appliances (BaRA) against that of the Hotline device to describe an optimal setup for these devices.

Methods: This was a quasi-experimental laboratory study that measured the thermal performance of two BaRA devices and the Hotline device under a number of scenarios. Independent variables including fluid type, flow rate, warming temperature and warming transit distance were sequentially altered and temperatures measured along the fluid stream. Change in temperature (ΔT) was calculated as the difference between entry and exit temperature for each combination of variables for each warming device.

Results: A total of 219 experiments were performed. At a temperature of 43.0°C and a transit distance of 200 cm, the BaRA A configuration either matched or exceeded the ΔT of the Hotline over all fluid type and flowrate combinations. The BaRA B configuration does not provide comparable thermal performance to the Hotline. Measured flowrates were noticeably slower than manufacturer-quoted values for all intravenous (IV) cannulae used.

Conclusion: A warm-water bath at 43.0°C with 200 cm of submerged IV tubing provides thermal performance comparable to the Hotline device, with all fluid type and flowrate combinations.

Contributions of the study: The present study provides an evidence-based method for warming intravenous fluid in resource-limited scenarios.

Background: Previous studies demonstrated higher mortality for patients with a longer pre-intensive care unit (ICU) hospital length of stay (LOS), in well-resourced settings.

Objectives: The study aimed to determine the association between pre-ICU hospital LOS and ICU outcomes in a resource-limited setting. We hypothesised that longer pre-ICU hospital LOS would be associated with higher ICU mortality.

Methods: This was a retrospective cohort study measuring the association between pre-ICU hospital LOS and ICU outcomes using data extracted from a regional hospital ICU in KwaZulu-Natal, South Africa. Consecutive ICU admissions of all patients (medical and surgical) older than 18 years were included during the study period September 2014 to August 2018. A corrected sample size of 2 040 patients was identified. Multivariable logistic regression was used to assess the primary outcome of ICU mortality, and multivariable Cox proportional hazard regression was used for the secondary outcome of ICU LOS.

Results: The median pre-ICU hospital LOS was 1 day (interquartile range (IQR) 0 - 2 days). The median length of ICU stay was 2.4 days (IQR 1.1 - 4.8 days) and the observed ICU mortality was 16% (n=327/2 040). Pre-ICU hospital LOS was not associated with ICU mortality in the unadjusted (odds ratio (OR) 1.00; 95% confidence interval (CI) 0.98 - 1.02; p=0.68; n=2 040) and fully adjusted logistic regression models (OR 1.00; 95% CI 0.98 - 1.03; p=0.90; n=1 981) using a complete case analysis for missing patient-level covariates. In Cox proportional hazard models, there was no association between pre-ICU hospital LOS and ICU LOS (hazard ratio 1.00; 95% CI 0.98 - 1.03; p=0.72; n=1 967), including when stratified by admission source.

Conclusion: Pre-ICU hospital LOS was not associated with either ICU mortality or ICU LOS in a resource-limited setting. Future studies should aim to include multicentre data and evaluate long-term outcomes.

Contributions of the study: The study was conducted in a resource-limited setting and found no association between prolonged LOS pre-ICU and patient outcomes. Several potential explanations for this observation have been explored. This important subject is pertinent to the appropriate use of limited resources and encourages future studies to evaluate this association and to consider longer-term outcomes (e.g. 30-day mortality) in future findings.

Summary: Death is a medical occurrence that has social, legal, religious and cultural consequences requiring common clinical standards for its diagnosis and legal regulation. This document compiled by the Critical Care Society of Southern Africa outlines the core standards for determination of death in the hospital context. It aligns with the latest evidence-based research and international guidelines and is applicable to the South African context and legal system. The aim is to provide clear medical standards for healthcare providers to follow in the determination of death, thereby promoting safe practices and high-quality care through the use of uniform standards. Adherence to such guidelines will provide assurance to medical staff, patients, their families and the South African public that the determination of death is always undertaken with diligence, integrity, respect and compassion, and is in accordance with accepted medical standards and latest scientific evidence. The consensus guidelines were compiled using the AGREE II checklist with an 18-member expert panel participating in a three-round modified Delphi process. Checklists and advice sheets were created to assist with application of these guidelines in the clinical environment (https://criticalcare.org.za/resource/death-determination-checklists/).

Key points: Brain death and circulatory death are the accepted terms for defining death in the hospital context.Death determination is a clinical diagnosis which can be made with complete certainty provided that all preconditions are met.The determination of death in children is held to the same standard as in adults but cannot be diagnosed in children <36 weeks' corrected gestation.Brain-death testing while on extra-corporeal membrane oxygenation is outlined.Recommendations are given on handling family requests for accommodation and on consideration of the potential for organ donation.The use of a checklist combined with a rigorous testing process, comprehensive documentation and adequate counselling of the family are core tenets of death determination. This is a standard of practice to which all clinicians should adhere in end-of-life care.

Background: Antimicrobial stewardship has become an important initiative within intensive care units in the global fight against antimicrobial resistance. Support for nurses to participate in and actively direct antimicrobial stewardship interventions is growing however, there may be barriers that impede the development of this nursing role.

Objectives: To explore the views of healthcare professionals regarding barriers to the antimicrobial stewardship role of the nurse in intensive care in a private hospital in KwaZulu-Natal, South Africa.

Methods: Using a qualitative research approach, purposive sampling was used to identify fifteen participants from the disciplines of nursing, surgery, anaesthetics, internal medicine, microbiology, and pharmacy in a general intensive care unit. Content analysis was used to code data obtained from each individual interview.

Results: The following categories and subcategories were derived: regarding barriers to the role of the nurse in antimicrobial stewardship: (i) lack of collaboration (subcategories: not participating in the antimicrobial stewardship programme, no feedback about antimicrobial resistance in the unit, and not part of decision-making); (ii) inadequate knowledge (subcategories: not understanding infection prevention and control, missing the link between laboratory results and start of treatment, and poor knowledge of antibiotics and their administration); and (iii) inexperienced nurses (subcategories: shortage of intensive care nurses, lack of experienced nurses, and inadequate nursing staff to provide in-service training).

Conclusion: The nursing role within antimicrobial stewardship was negatively affected by both staffing and collaborative difficulties, which impacted on the implementation of antimicrobial stewardship within the unit.

Contributions of the study: Nurses are not well-integrated into antimicrobial stewardship. Insufficient training and education on aspects of antimicrobial stewardship are available to nurses.

Background: Decisions to withdraw life-sustaining treatment (WLST) are common in intensive care units (ICUs). Clinical and non-clinical factors are important, although the extent to which each plays a part is uncertain.

Objectives: To determine whether the timing of decisions to WLST varies between ICUs in a single centre in three countries and whether differences in timing are explained by differences in clinical decision-making.

Methods: The study involved a convenience sample of three adult ICUs - one in each of the UK, USA and South Africa (SA). Data were prospectively collected on patients whose life-sustaining treatment was withdrawn over three months. The timing of decisions was collected, as were patients' premorbid functional status and illness severity 24 hours prior to decision to WLST. Multivariate analysis was used to identify factors associated with decisions to WLST. Clinicians participated in interviews involving hypothetical case studies devoid of non-clinical factors.

Results: Deaths following WLST accounted for 23% of all deaths during the study period at the USA site v. 37% (UK site) and 70% (SA site) (p<0.0010 across the three sites). Length of stay (LOS) prior to WLST decision varied between sites. Controlling for performance status, age, and illness severity, study site predicted LOS prior to decision (p<0.0010). In the hypothetical cases, LOS prior to WLST was higher for USA clinicians (p<0.017).

Conclusion: There is variation in the proportion of ICU patients in whom WLST occurs and the timing of these decisions between sites; differences in clinical decision-making may explain the variation observed, although clinical and non-clinical factors are inextricably linked.

Contributions of the study: This study has identified variation in the timing of decisions to withdraw life-sustaining treatment in adult ICUs in three centres in three different healthcare systems. Although differences in clinical decision-making likely explain some of the variation, non-clinical factors (relating to the society in which the clinicians live and work) may also play a part.

Background: Adequate nutritional support is crucial to optimising intensive care unit (ICU) outcomes.

Objectives: To assess adherence to current nutritional guidelines in critically ill patients in South Africa (SA). To identify risk factors for non-adherence to guideline.

Methods: Retrospective observational chart review of nutritional practices, from 1 December 2017 to 31 May 2018, during the first week of ICU admission in adult patients admitted to a tertiary, multidisciplinary ICU in Durban, SA, for >48 hours.

Results: The study cohort (N=150) had a median age of 39 years and an ICU mortality of 28%. Surgical patients accounted for 50.7% of admissions. Ninety-eight percent of patients received mechanical ventilation, 75% required inotropic support, and 56% had acute kidney injury. The median time to initiation of enteral nutrition (EN) was 3 days, with EN being initiated within 48 hours in 39% of patients, and by day 7 80% of patients had received EN. Goal feeds were reached in 23% of patients by discharge, death or day 7. Parenteral nutrition was initiated in 16.7% of patients. There was an association between shock, acute kidney injury, increasing sequential organ failure assessment score and inotrope dose, and failure to initiate EN. Failure to initiate EN was predominantly due to unavoidable factors, but a number of clinical and administrative areas were identified to improve EN delivery.

Conclusion: Adequate nutrition is associated with reduced morbidity, ICU length of stay, mortality and improved functional outcomes. More attention to avoiding barriers to adequate ICU nutrition and enhanced adherence to feeding protocols should be encouraged.

Contributions of the study: This study significantly adds to the limited data available from sub- Saharan Africa on nutritional practices in critical care, and in particular barriers to provision of EN. It is further anticipated that the findings of the study will contribute in making recommendations in an attempt to improve the outcomes.

Background: Botswana is an economically stable middle-income country with a developing health system and a large HIV and infectious disease burden. Princess Marina Hospital (PMH) is the largest referral and teaching hospital with a mixed eight-bed intensive care unit (ICU).

Objectives: To conduct an audit of PMH ICU in order to investigate major admission categories and quantify morbidity and mortality figures using a validated scoring system for quality improvement, education and planning purposes.

Methods: PMH medical records and laboratory data were accessed to record demographics, referral patterns, diagnoses, HIV status, Acute Physiologic Assessment and Chronic Health Evaluation (APACHE) II scores and mortality rates.

Results: A total of 182 patients >14 years of age were enrolled over a 12-month period from April 2017 - March 2018. Patient's mean age was 42.9 years, males represented 56.6% of the study population and surgical conditions accounted for 46% of diagnostic categories. Sixty percent of the patients were HIV-negative and 12% had no HIV status recorded. The mean APACHE II score was 25 and the mean length of stay in ICU was 10.3 days. Higher APACHE II scores were associated with higher mortality regardless of HIV status. The overall mortality was 42.8% and there was no difference in mortality rates in ICU or at 30 days between HIV-positive and HIV-negative ICU patient groups.

Conclusion: The PMH ICU population is young with a high mean APACHE II score, significant surgical and HIV burdens and a high mortality rate. PMH ICU has significant logistical challenges making comparison with international ICUs challenging, and further research is warranted.

Contributions of the study: This study is the first published audit for an intensive care unit in Botswana. The findings are especially relevant for the development of critical care capacity in the country during the current COVID-19 pandemic. We advocate for the establishment of an ICU registry in the country to allow ongoing accurate research in the field of critical care medicine and to improve healthcare for all critically ill patients in Botswana.