One-two-triage: validation and reliability of a novel triage system for low-resource settings

The value of shock index, modified shock index and age shock index to predict mortality and hospitalisation in a district level emergency centre

Introduction

Triage is the most important step in patients' journey through an Emergency Centre (EC) and directly impacts time to critical actions. Triage tools, like the South African Triage Scale, are however not designed to predict patient outcomes. The shock index (SI), modified shock index (MSI) and age shock index (ASI) are clinical markers derived from vital signs and correlate with tissue perfusion in critically ill patients. This study aimed to assess the value of SI, MSI and ASI to predict mortality and the need for hospitalisation in all adult patients presenting to a district level emergency centre in South Africa.

Methods

This diagnostic study was performed as a retrospective observational study, using data from an existing electronic registry at a district level hospital emergency centre over a period of 24 months. All adult patients who presented to Mitchells Plain Hospital were eligible for inclusion. Sensitivity, specificity and likelihood ratios were calculated for each variable as a predictor of mortality and hospitalisation with pre-determined thresholds.

Results

During the study period of 24 months, a total of 61 329 patients ≥ 18 years old presented to the EC with 60 599 included in the final sample. A red SATS triage category (+LR = 7.2) and SI ≥1.3 (+LR = 4.9) were the only two predictors with any significant clinical value. The same two markers performed well for both patients with and without trauma and specifically for patients who died while under the care of the emergency centre.

Discussion

The study demonstrated that patients with a SI≥1.3 at triage have a significantly higher likelihood to die or require hospitalisation, whether the presenting complaint is trauma related or not, especially to predict mortality while under the care of the EC. Incorporating this marker as a triage alert could expedite the identification of patients requiring time critical interventions and improve patient throughput in the emergency centre.

Emergency care in post-conflict settings: a systematic literature review

BACKGROUND

Emergency care systems (ECS) organize and provide access to life-saving care both during transport and at health facilities. Not enough is known about ECS in uncertain contexts such as post-conflict settings. This review aims to systematically identify and summarize the published evidence on the delivery of emergency care in post-conflict settings and to guide health sector planning.

METHODS

We searched five databases (PubMed MEDLINE, Web of Science, Embase, Scopus, and Cochrane) in September 2021 to identify relevant articles on ECS in post-conflict settings. Included studies (1) described a context that is post-conflict, conflict-affected, or was impacted by war or crisis; (2) examined the delivery of an emergency care system function; (3) were available in English, Spanish, or French; and (4) were published between 1 and 2000 and 9 September 2021. Data were extracted and mapped using the essential system functions identified in the World Health Organization (WHO) ECS Framework to capture findings on essential emergency care functions at the scene of injury or illness, during transport, and through to the emergency unit and early inpatient care.

RESULTS

We identified studies that describe the unique burden of disease and challenges in delivering to the populations in these states, pointing to particular gaps in prehospital care delivery (both during scene response and during transport). Common barriers include poor infrastructure, lingering social distrust, scarce formal emergency care training, and lack of resources and supplies.

CONCLUSION

To our knowledge, this is the first study to systematically identify the evidence on ECS in fragile and conflict-affected settings. Aligning ECS with existing global health priorities would ensure access to these critical life-saving interventions, yet there is concern over the lack of investments in frontline emergency care. An understanding of the state of ECS in post-conflict settings is emerging, although current evidence related to best practices and interventions is extremely limited. Careful attention should be paid to addressing the common barriers and context-relevant priorities in ECS, such as strengthening prehospital care delivery, triage, and referral systems and training the health workforce in emergency care principles.

A prospective, internal validation of an emergency patient triage tool for use in a low resource setting

Aim

Assess the performance of a simple triage disposition score based on mental status, mobility and either oxygen saturation or respiratory rate by three principal metrics: 24 h mortality, the need for hospital admission and the urgency ranking of patient presentations.

Method

Prospective observational non-interventional study of consecutive patients presenting to the emergency and outpatient departments of a low-resource sub-Saharan hospital

Results

Out of 14,585 consecutive patients arriving to hospital 1,804 (12.4%) were admitted and 39 died (0.3%) within 24 hours. No patients with normal mental status or a stable independent gait died within 24 h, and 95% of those who did had an oxygen saturation <94%. The c statistic of the score for death within 24 hours was >0.95 and not significantly changed if respiratory rate replaced oxygen saturation as a score component, or mental status was assessed subjectively or objectively. However, an objective measure of mental status significantly reduced the c statistic for hospital admission from 0.970 SE 0.003 to 0.956 SE 0.004, p 0.002. The score attributed a higher acuity rating than the South African Triage System urgency ranking of presentations to 11.1% of patients and a lower acuity rating to 1.3%. However, 53% of the patients given a higher acuity rating were subsequently admitted to hospital and 6.1% of them died.

Conclusion

The score identified patients who subsequently required hospital admission and who were likely to die within 24 hours.

Prospective validation of a novel triage system developed in a middle income country - AIIMS triage protocol

Introduction:

Triage is a crucial process not only to identify sick patients and prioritize prompt management but also to foster efficient resource utilization. In low-and middle-income countries (LMICs) most emergency departments (ED) still have an informal triage process. Although an important element of emergency care, triage research has not been a priority in LMICs, and hence, very few triage systems have been validated. The All India Institute of Medical Sciences (AIIMS) triage protocol or ATP for adult patients was developed by expert consensus at AIIMS using the Delphi method. We attempted a prospective validation of the ATP in terms of mortality and intensive care unit (ICU)/hospital admission at 24 h.

Methods:

Patients presenting to the ED, who were 14 years and above were included in the study. The patients were followed up at 24 h and their outcome documented on a standardized data collection form. Mortality and ICU admission were noted at 24 h.

Results:

A total of 15,505 patients were recruited. After exclusion, among 13,754 patients, 6303 (45.83%) were triaged red and 7451 (54.17%) were triaged yellow. Mortality at 24 h was 10.31% (650) in red triaged patients and 0.35% (26) in yellow triaged patients. The 24-h mortality of red triaged patients was significantly higher (P <0.001) than that of yellow triaged patients. The presence of one or more ATP “Red” criteria was 96.2% (95% confidence interval [CI]: 94.42%–97.47%) sensitive and 56.8% (95% CI: 55.92%–57.63%) specific in predicting 24-h mortality. The sensitivity and specificity of ATP “Red” criteria for 24-h ICU admission were 98.5% (95% CI: 97.7%–99.1%) and 59.6% (95% CI: 58.8%–60.5%), respectively.

Conclusion:

When applied to adult nontrauma patients, ATP had a high accuracy in recognizing sick patients presenting to the ED. A time-tested and validated triage system like ATP may be a good starting point for public hospital EDs in LMICs.

Two simple replacements for the Triage Early Warning Score to facilitate the South African Triage Scale in low resource settings

BACKGROUND

The South African Triage Scale (SATS) requires the calculation of the Triage Early Warning Score (TEWS), which takes time and is prone to error.

AIM

to derive and validate triage scores from a clinical database collected in a low-resource hospital in sub-Saharan Africa over four years and compare them with the ability of TEWS to triage patients.

METHODS

A retrospective observational study carried out in Kitovu Hospital, Masaka, Uganda as part of an ongoing quality improvement project. Data collected on 4482 patients was divided into two equal cohorts: one for the derivation of scores by logistic regression and the other for their validation.

RESULTS

Two scores identified the largest number of patients with the lowest in-hospital mortality. A score based on oxygen saturation, mental status and mobility had a c statistic for discrimination of 0.83 (95% CI 0.079-0.87) in the derivation, and 0.81 (95% CI 0.77-0.86) in the validation cohort. Another score based on respiratory rate, mental status and mobility had a c statistic of 0.82 (95% CI 0.078-0.87) in the derivation, and 0.81 (95% CI 0.77-0.86) in the validation cohort. The oxygen saturation-based score of zero points identified 51% of patients in the derivation cohort who had in-hospital mortality rate of 0.5%, and 49% of patients in the validation cohort who had in-hospital mortality of 1.0%. A respiratory rate-based score of zero points identified 45% in the derivation cohort who had in-hospital mortality rate of 0.5%, and 44% of patients in the validation cohort who had in-hospital mortality of 0.8%. Both scores had comparable performance to TEWS.

CONCLUSION

Two easy to calculate scores have comparable performance to TEWS and, therefore, could replace it to facilitate the adoption of SATS in low-resource settings.

Defining High-risk Emergency Chief Complaints: Data-driven Triage for Low- and Middle-income Countries

OBJECTIVES

Emergency medicine in low- and middle-income countries (LMICs) is hindered by lack of research into patient outcomes. Chief complaints (CCs) are fundamental to emergency care but have only recently been uniquely codified for an LMIC setting in Uganda. It is not known whether CCs independently predict emergency unit patient outcomes.

METHODS

Patient data collected in a Ugandan emergency unit between 2009 and 2018 were randomized into validation and derivation data sets. A recursive partitioning algorithm stratified CCs by 3-day mortality risk in each group. The process was repeated in 10,000 bootstrap samples to create an averaged risk ranking. Based on this ranking, CCs were categorized as "high-risk" (>2× baseline mortality), "medium-risk" (between 2 and 0.5× baseline mortality), and "low-risk" (<0.5× baseline mortality). Risk categories were then included in a logistic regression model to determine if CCs independently predicted 3-day mortality.

RESULTS

Overall, the derivation data set included 21,953 individuals with 7,313 in the validation data set. In total, 43 complaints were categorized, and 12 CCs were identified as high-risk. When controlled for triage data including age, sex, HIV status, vital signs, level of consciousness, and number of complaints, high-risk CCs significantly increased 3-day mortality odds ratio (OR = 2.39, 95% confidence interval [CI] = 1.95 to 2.93, p < 0.001) while low-risk CCs significantly decreased 3-day mortality odds (OR = 0.16, 95% CI = 0.09 to 0.29, p < 0.001).

CONCLUSIONS

High-risk CCs were identified and found to predict increased 3-day mortality independent of vital signs and other data available at triage. This list can be used to expand local triage systems and inform emergency training programs. The methodology can be reproduced in other LMIC settings to reflect their local disease patterns.

Triage education in rural remote settings: A scoping review

BACKGROUND

Triage is a complex nursing task to prioritise patient care, based on acuity. Triage decisions can affect patient safety and must employ critical thinking. Graduate registered nurses are expected to triage in rural facilities, which is in contrast to current guidelines. The purpose of this review was; to discover how effective education support programs were in developing clinical decision-making skills for graduates at triage; and to determine what is known about triage education support programs for graduate or novice registered nurses undertaking triage in rural and remote settings.

METHOD

A scoping review was undertaken to identify and analyse primary research articles following PRISMA guidelines, sourced from four electronic databases.

RESULTS

6158 retrieved articles were found, after duplicate removal and screening against inclusion/exclusion criteria; fourteen articles were included. Themes included 'variability of triage accuracy and assessment'; 'education qualifications and experience'; and 'training and supervision'.

CONCLUSION

This review demonstrates significant gaps in the literature reporting on this topic area, particularly in the rural context. Common recommendations include standardised triage education strategies, and strategies that account for differences in resourcing levels. Further research is required to attempt to link education strategies in rural contexts to acceptable triage outcomes like triage accuracy.

Inter-rater and intrarater reliability of the South African Triage Scale in low-resource settings of Haiti and Afghanistan

Objective

The South African Triage Scale (SATS) has demonstrated good validity in the EDs of Médecins Sans Frontières (MSF)-supported sites in Afghanistan and Haiti; however, corresponding reliability in these settings has not yet been reported on. This study set out to assess the inter-rater and intrarater reliability of the SATS in four MSF-supported EDs in Afghanistan and Haiti (two trauma-only EDs and two mixed (including both medical and trauma cases) EDs).

Methods

Under classroom conditions between December 2013 and February 2014, ED nurses at each site assigned triage ratings to a set of context-specific vignettes (written case reports of ED patients). Inter-rater reliability was assessed by comparing triage ratings among nurses; intrarater reliability was assessed by asking the nurses to retriage 10 random vignettes from the original set and comparing these duplicate ratings. Inter-rater reliability was calculated using the unweighted kappa, linearly weighted kappa and quadratically weighted kappa (QWK) statistics, and the intraclass correlation coefficient (ICC). Intrarater reliability was calculated according to the percentage of exact agreement and the percentage of agreement allowing for one level of discrepancy in triage ratings. The correlation between years of nursing experience and reliability of the SATS was assessed based on comparison of ICCs and the respective 95% CIs.

Results

A total of 67 nurses agreed to participate in the study: In Afghanistan there were 19 nurses from Kunduz Trauma Centre and nine from Ahmed Shah Baba; in Haiti, there were 20 nurses from Martissant Emergency Centre and 19 from Tabarre Surgical and Trauma Centre. Inter-rater agreement was moderate across all sites (ICC range: 0.50–0.60; QWK range: 0.50–0.59) apart from the trauma ED in Haiti where it was moderate to substantial (ICC: 0.58; QWK: 0.61). Intrarater agreement was similar across the four sites (68%–74% exact agreement); when allowing for a one-level discrepancy in triage ratings, intrarater reliability was near perfect across all sites (96%–99%). No significant correlation was found between years of nursing experience and reliability.

Conclusion

The SATS has moderate reliability in different EDs in Afghanistan and Haiti. These findings, together with concurrent findings showing that the SATS has good validity in the same settings, provide evidence to suggest that SATS is suitable in trauma-only and mixed EDs in low-resource settings.

Global Emergency Medicine: A Review of the Literature From 2016

OBJECTIVES

The Global Emergency Medicine Literature Review (GEMLR) conducts an annual search of peer-reviewed and gray literature relevant to global emergency medicine (EM) to identify, review, and disseminate the most important new research in this field to a global audience of academics and clinical practitioners.

METHODS

This year 13,890 articles written in four languages were identified by our search. These articles were distributed among 20 reviewers for initial screening based on their relevance to the field of global EM. An additional two reviewers searched the gray literature. All articles that were deemed appropriate by at least one reviewer and approved by their editor underwent formal scoring of overall quality and importance. Two independent reviewers scored all articles.

RESULTS

A total of 716 articles met our inclusion criteria and underwent full review. Fifty-nine percent were categorized as emergency care in resource-limited settings, 17% as EM development, and 24% as disaster and humanitarian response. Nineteen articles received scores of 18.5 or higher out of a maximum score of 20 and were selected for formal summary and critique. Inter-rater reliability testing between reviewers revealed Cohen's kappa of 0.441.

CONCLUSIONS

In 2016, the total number of articles identified by our search continued to increase. The proportion of articles in each of the three categories remained stable. Studies and reviews with a focus on infectious diseases, pediatrics, and the use of ultrasound in resource-limited settings represented the majority of articles selected for final review.