|Year : 2022 | Volume
| Issue : 3 | Page : 133-137
Utility of National Early Warning Score 2 to risk-stratify coronavirus disease of 2019 patients in the emergency department: A retrospective cohort study
Sweta Khuraijam, Alok Gangurde, Vridhi Shetty
Department of Emergency Medicine, Dr. D.Y. Patil Medical College, Dr. D.Y.Patil Vidyapeeth, Pune, Maharashtra, India
|Date of Submission||25-Jan-2022|
|Date of Acceptance||25-Feb-2022|
|Date of Web Publication||20-Sep-2022|
Dr. Sweta Khuraijam
Department of Emergency Medicine, Dr. D.Y. Patil Medical College, Sant Tukaram Nagar, Pimpri, Pune - 411 018, Maharashtra
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: The application of a risk stratification pathway is necessary for the emergency department (ED) to assess the severity of the disease and the need for escalation of therapy. We aimed to implement the National Early Warning Score 2 (NEWS2) pathway at triage to differentiate patients who are stable or critically ill with no invasive investigations at the time of admission during the coronavirus disease of 2019 (COVID-19) era in comparison to other clinical risk scores.
Methods: One hundred and four patients were collected from April 1, 2021, to June 1, 2021, during the second wave of the COVID-19 pandemic at an academic medical center in India. The NEWS2 scoring system and the quick sepsis-related organ failure assessment (qSOFA) score were introduced as part of the initial assessment in the triage area of the ED. Data were assessed using the area under the receiving operating characteristic (AUROC) curve for NEWS2 and qSOFA scores, respectively.
Results: In the study, NEWS2 classification indicated that 25% of patients required continuous monitoring, of which 12.7% subsequently deteriorated within 24 h of admission and 7% died. Both, NEWS2 (threshold 0; 1, AUROC 0.883; 95%; confidence interval [CI] 0.8–0.966) and qSOFA (threshold 0; 1, AUROC 0.851; 95% CI 0.766–29 0.936) effectively identified COVID-19 patients in the ED at risk for clinical deterioration. There was no significant difference in the diagnostic performance of qSOFA and NEWS2 (DeLong's test P = 0.312).
Conclusion: Both NEWS2 and qSOFA effectively-identified COVID-19 patients in the ED at risk for clinical deterioration with no significant statistical difference. However, a triage level risk stratification score can be developed with the inclusion of blood parameters on admission to further validate the practice.
Keywords: Coronavirus disease of 2019, National Early Warning Score 2, quick sepsis-related organ failure assessment, triage
|How to cite this article:|
Khuraijam S, Gangurde A, Shetty V. Utility of National Early Warning Score 2 to risk-stratify coronavirus disease of 2019 patients in the emergency department: A retrospective cohort study. Int J Crit Illn Inj Sci 2022;12:133-7
|How to cite this URL:|
Khuraijam S, Gangurde A, Shetty V. Utility of National Early Warning Score 2 to risk-stratify coronavirus disease of 2019 patients in the emergency department: A retrospective cohort study. Int J Crit Illn Inj Sci [serial online] 2022 [cited 2022 Dec 3];12:133-7. Available from: https://www.ijciis.org/text.asp?2022/12/3/133/356358
| Introduction|| |
After the first wave of the severe acute respiratory syndrome coronavirus-2 pandemic in 2020, the second wave of the virus with its mutated variants was the much-anticipated peril for most countries, of which India capped the spot for the worst affected with 401,078 cases reported on a single day. The blanket of various symptoms and clinical variations flooded the ED making it exigent to triage. The brunt of the overflowing surge capacity was faced by the various hospitals in the country, with many closing their doors to the public once the resources were drained. In resource-limited settings, it is even more important to rapidly risk-stratify patients while sparing resources to identify those suspected and confirmed coronavirus disease 2019 (COVID-19) patients with a severe or critical illness as well as those at risk for clinical deterioration.
Traditional clinical risk stratification tools are widely used for continuous assessment of patients in the ED and intensive care units (ICU), but only a few studies have evaluated the use of these tools at triage during the COVID-19 pandemic in the ED.
National Early Warning Score 2 (NEWS 2) is a standardized clinical scoring system developed for improved detection of deterioration in acutely ill patients [Figure 1]. The primary aim of the study was to determine if the application of the NEWS2 score at triage in the ED with COVID-19 patients (suspected or confirmed) was more effective in identifying patients with critical illness, clinical deterioration, or hospital mortality within 24 h of admission, as compared to the quick sepsis-related organ failure assessment (qSOFA) score.
| Methods|| |
A retrospective cohort study was conducted from April 1, 2021, to June 1, 2021, at an academic medical center in India. Before data collection, the study was approved by the institutional review board/ethics committee and informed consent was obtained on admission. Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines were followed for the study.
A convenience sample of patients above the age of 18 years; irrespective of their COVID-19 status at triage was abstracted from the paper hospital records. Missing or incomplete data were omitted from the study.
The ED is operationally divided by a three-tier triage system to which patients are directed based on their triage presentation: green (stable, does not require monitoring) and yellow (stable, requires monitoring) were admitted to the observation unit, and red (unstable, requires monitoring) to the emergency medicine ICU (EM ICU). In addition, the hospital had established an auxiliary care unit (fever clinic) for suspected and confirmed COVID-19 patients which may provide supplemental oxygen, monitors, and ventilator support (if needed) with online support for providers.
NEWS2 [Figure 1] and [Figure 2] and qSOFA were calculated based on the triage presentation and had been integrated into the pro forma for assessment. qSOFA is a bedside tool that may identify patients with suspected infection at greater risk for a poor outcome outside the ICU. It assigns 1 point for each of the following criteria: low blood pressure (systolic blood pressure ≤100 mmHg), high respiratory rate (≥22 breaths/min), or altered mentation (Glasgow Coma Scale <15). A qSOFA score ≥2 has been associated with an increased risk of death or prolonged ICU stay.
|Figure 2: Severity of the clinical risks as per presentation for National Early Warning Score 2|
Click here to view
Data were coded and recorded using Microsoft Excel (Microsoft Corp., Redmond, USA) version 16.57. Statistical analyses were performed using IBM SPSS version 23 (IBM Corp., Armonk, USA). Descriptive statistics were elaborated in the form of means with standard deviations or medians with interquartile range for continuous variables, frequencies, and percentages for categorical variables. In case the expected frequency in the contingency tables was found to be <5 for >25% of the cells, Fisher's Exact Test was used instead. Statistical significance was kept at P < 0.05 for the association between various parameters. Data were assessed using the Area Under the Receiver Operating Characteristics (AUROC) for NEWS2 (cutoff >8) and qSOFA (cutoff ≥2) scores, respectively.
| Results|| |
One hundred and four patients were assessed in the triage area using the NEWS 2 score and qSOFA score. They were further segregated as per their clinical risk levels for further management.
The mean age (years) was 48.17 with a median of 47.0 (range from 18 to >70 years) and 70:34 were the male: female ratio [Table 1] and [Table 2]. Twenty-six patients with various symptoms presented with a COVID-19 reverse transcription-polymerase chain reaction (RT-PCR)-positive report before admission, while the remaining accounted for the suspected category despite a negative rapid antigen test on admission [Table 3]. As per presentation to the ED, 31 were admitted to the EM ICU, 57 in the fever clinic, and remaining in the observation room.
Twenty-five percent required continuous monitoring as per their clinical risk status of NEWS2 score of which 12.7% (n = 13) deteriorated, 12 from the high-risk group (three in fever clinic, nine in EM ICU), and one from the low risk within 24 h of admission accounting for 7% mortality [Table 4].
|Table 4: Association between deterioration of patient and other parameters|
Click here to view
[Table 5] shows the patient's COVID-19 status and association with mortality. It was noted that five were rapid antigen negative.
NEWS2 (threshold 0;1, AUROC 0.883; (95%, confidence interval [CI] 0.8–0.966] and qSOFA (threshold 0;1, AUROC 0.851; 95%, CI 0.766–29 0.936) effectively identified patients in the ED at risk for clinical deterioration [Table 6] and [Table 7]. Although in comparison, there was no significant difference in the diagnostic performance of qSOFA and NEWS2 scores (DeLong's test P = 0.312).
|Table 6: Performance of study parameters for predicting deterioration of patient|
Click here to view
|Table 7: Comparison of the diagnostic performance of various predictors in predicting deterioration of the patient|
Click here to view
Strengths and limitations
The study was limited by the availability of immediate COVID-19 RT-PCR-test and the small sample size. Furthermore, qSOFA has been validated for sepsis only; hence its parameters could not be justified for certain cases.
| Discussion|| |
The primary finding in the study is that the NEWS2 score was found to be as effective as the qSOFA score in differentiating patients at triage as per the clinical risks of deterioration. The study conducted in Norway by Stine Engebretsen et al. and Myrstad et al. shows that the NEWS2 score is adequate for the prediction of “ICU admission” and “critical care in ED,” which is similar to the result of our study. This also highlighted the need for different levels of monitoring intensity as per the risk groups. Whereas in a multicentric study, NEWS2 score was found to have poor to moderate outcome for the severity prediction of COVID-19, risk stratification was improved with added blood tests and the parameters on admission. Even though the primary presentations were mostly secondary to the respiratory insult, symptoms varying from altered sensorium, chest pain, loose stool, etc., were also found to be COVID-19-positive. Twelve from the high risk and one from the low-risk groups deteriorated within 24 h of admission. It was also noted that five were rapid antigen-negative in the high-risk group. These various presentations or just the detection of the virus itself in a nonsuspect proved to be an admission conundrum. NEWS2 not only covered the hypoxemic parameter of the disease but also the others required for clinical risk stratification in comparison to qSOFA.
Despite the COVID-19 status of the patient, clinical risk stratification at triage will be a hallmark. It can control triage traffic and decrease the time required for admission, resources, and workforce utilization during a crisis.
Perhaps a larger, multicentric study is required to validate the use of the NEWS2 score as a triaging tool or the development of a scoring system specific to the ED for clinical risk stratification irrespective of the COVID-19 status is the need of the hour.
Best parameter in terms of AUROC: National Early Warning Score 2
Best parameter in terms of sensitivity: National Early Warning Score 2
Best parameter in terms of specificity: quick sepsis-related organ failure assessment (qSOFA) score
Best parameter in terms of positive predictive value: qSOFA score
Best parameter in terms of negative predictive value: National Early Warning Score 2
| Conclusion|| |
With the ever-evolving pathology and clinical characteristics of the COVID-19 virus, we are far away from the complete containment of the disease. The predicament of future waves of the virus edges the health-care system to hold the fort down with limited resources. NEWS2 is one of the clinical risk stratification tools that can triage patients but only with clinical parameters. The study of such a tool along with blood parameters could rectify the system and prevent future tribulation.
Research quality and ethics statement
This study was approved by the Institutional Review Board and Ethics Committee at Dr. D. Y. Patil Medical College, Vidyapeeth, Pune (Approval number: Med/20/10 on November 12, 2020). The authors followed the applicable EQUATOR network's STROBE guidelines during the conduct of this research project.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| References|| |
qSOFA: Quick Sepsis Related Organ Failure Assessment.Qsofa.org; 2021. Available from: https://qsofa.org/
Engebretsen S, Bogstrand ST, Jacobsen D, Vitelli V, Rimstad R. NEWS2 versus a single-parameter system to identify critically ill medical patients in the emergency department. Resusc Plus 2020;3:100020.
Myrstad M, Ihle-Hansen H, Tveita A, Andersen EL, Nygård S, Tveit A, et al.
National Early Warning Score 2 (NEWS2) on admission predicts severe disease and in-hospital mortality from COVID-19 – A prospective cohort study. Scand J Trauma Resusc Emerg Med 2020;28:66.
Carr E, Bendayan R, Bean D, Stammers M, Wang W, Zhang H, et al.
Evaluation and improvement of the National Early Warning Score (NEWS2) for COVID-19: A multi-hospital study. BMC Med 2021;19:23.
[Figure 1], [Figure 2]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6], [Table 7]