Implementation and Evaluation of an Electronic Early Warning Score (e-EWS) System

Health Knowledge, Attitudes, Practice Clinical Trial

Official title:

Implementation and Evaluation of an Electronic Early Warning Score (e-EWS) System

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT04425694
• Other study ID #: e-EWS 20200526
• Status: Active, not recruiting
• Start date: November 1, 2019
• Est. completion date: December 31, 2020

Study information

• Verified date: June 2020
• Source: The University of Hong Kong
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Early Warning Score (EWS) is a tool designed to help clinicians efficiently identify and track patients who have or develop acute illness, and make timely clinical responses. The calculation and charting of EWSs at Tuen Mun Hospital (TMH) is a manual process at present. The purpose of this study is to automate the EWS calculation and charting process using an electronic EWS (e-EWS) system. However, while the e-EWS system could potentially reduce ward staff's workload and improve patient safety, its effectiveness can only be realized through good human factors (HF) design that matches users' expectations, requirements and work practices. Therefore, our aim is to carry out HF methods in order to inform design of the e-EWS system before its implementation in a selected surgical ward in the hospital. After its implementation, we will also conduct evaluation of the e-EWS system to assess its effectiveness with respect to clinical outcomes.

Description:

Early Warning Score (EWS), also known as "track-and-trigger" system, is a tool designed to help clinicians efficiently identify and track patients who have or develop acute illness, and make timely clinical responses. An EWS is calculated based on values from a number of physiological parameters (e.g. respiration rate, oxygen saturation, systolic blood pressure, pulse rate, level of consciousness, and temperature) to obtain an aggregated score, which indicates a patient's health status. It is mostly used by ward nurses to monitor their patients; when a patient's EWS has exceeded a set threshold, the nurse should attend to the patient more closely and consider for intervention e.g. call a doctor. The philosophy of EWS is that it improves patient safety by enabling ward staff to detect patients' deterioration early so that timely intervention can be administered within the "golden period for treatment".

In the U.K., an EWS system called the National Early Warning Score (NEWS) was first released in 2012 (NEWS, 2012). The NEWS was the first system to standardize the calculation and charting of acute-illness severity and has been widely adopted across the National Health Service (NHS). Recently, in December 2017, NEWS2 has been released and it is an updated version of the NEWS (NEWS2, 2017). NEWS2 can be readily computerized and has already been integrated with some NHS hospitals' electronic health record systems. The Updated Report of a Working Party of NEWS2 states that "There are potential advantages of automated calculation of the NEW score and automated alert systems." (p. 6). Therefore, the objective of this proposed study is to implement and evaluate an electronic EWS (e-EWS) system in a selected surgical ward at Tune Mun Hospital (TMH).

At TMH, the current practice of obtaining ward patients' EWS is a manual process: firstly, a care giver measures a patient's specified physiological parameters by using the appropriate monitoring instruments; secondly, the care giver writes down the values of the parameters on a paper chart; thirdly, the paper chart is handed over to a nurse; and finally, the nurse calculates the EWS. The process is performed on a designated regular time interval.

There are two main drawbacks of the manual EWS process: firstly, it is inefficient because there are usually multiple patients in a ward and some physiological variables take time to measure. Therefore, in a busy ward, missed physiological measures and irregular measurement-taking intervals are often reported. These problems lead to staff ignoring EWS calculations. Secondly, when EWS are calculated, nurses often do so for patients who already show deteriorating conditions. This counters the original intent of EWS, which is to help identify patients with early signs of deterioration. These drawbacks compromise clinicians' ability to detect patient deterioration early, which could potentially compromise patient safety.

A potential solution is to automate the manual EWS process. Some hospitals in Hong Kong, for example, Tseung Kwan O Hospital has already adopted an e-EWS system in some of its wards. The e-EWS system is connected to a physiological monitor, which takes various physiological measurements. The system has an auto-charting module, which automatically captures patients' physiological measurements in an electronic chart (e-chart) and calculates their EWS. All the information in the auto-charting module is then wirelessly transferred to a central display in the ward's nurses station. The central display shows patients' status in terms of EWS and issues alerts when any EWS has exceeded a set threshold. The e-EWS system is not only capable of auto-charting but also provides an alert mechanism to help nurses detect early deterioration.

However, while the e-EWS system could potentially reduce ward staff's workload and improve patient safety, its effectiveness can only be realized through good HF design that matches users' expectations, requirements and work practices.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 20
• Est. completion date: December 31, 2020
• Est. primary completion date: December 31, 2020
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• All F3B ward nursing staff

Exclusion Criteria:

• Staff not in F3B ward

Related Conditions & MeSH terms

• Health Knowledge, Attitudes, Practice

Intervention

Device:
• e-EWS system
The e-EWS system is connected to a physiological monitor, which takes various physiological measurements. The system has an auto-charting module, which automatically captures patients' physiological measurements in an electronic chart (e-chart) and calculates their EWS. All the information in the auto-charting module is then wirelessly transferred to a central display in the ward's nurses station. The central display shows patients' status in terms of EWS and issues alerts when any EWS has exceeded a set threshold. The e-EWS system is not only capable of auto-charting but also provides an alert mechanism to help nurses detect early deterioration.

Locations

Country	Name	City	State
Hong Kong	Tuen Mun Hospital	Hong Kong

Sponsors (3)

Lead Sponsor	Collaborator
The University of Hong Kong	Lingnan University, Tuen Mun Hospital

Country where clinical trial is conducted

Hong Kong, 

References & Publications (2)

Royal College of Physicians. National Early Warning Score (NEWS) 2: Standardising the assessment of acute-illness severity in the NHS. Updated report of a working party. London: RCP, 2017.

Royal College of Physicians. National Early Warning Score (NEWS): Standardising the assessment of acute illness severity in the NHS. Report of a working party. London: RCP, 2012.

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Changes in the number of successful detection of deteriorating cases		from the beginning of the study to the 6th month later
Primary	Changes in the number of cardiopulmonary resuscitations (CPRs)		from the beginning of the study to the 6th month later
Primary	Changes in the number of ICU or high dependency unit transfer		from the beginning of the study to the 6th month later
Primary	Changes in the number of assistance calls to doctors		from the beginning of the study to the 6th month later
Secondary	Changes in application-specific self-efficacy	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's perceived usefulness of the e-EWS system	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's perceived ease of use of the e-EWS system	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's perceived behavioral control	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's attitude towards the e-EWS system	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's intention to use	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's perceived work performance	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's perceived workload	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in the quality of patient care	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in the workflow	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in the accuracy of the technology	This outcome will be measured by the 7-point Likert scale, with scores ranging from 1 (very strongly disagree) to 7 (very strongly agree).	from the beginning of the study to the 6th month later
Secondary	Changes in ward staff's personal experiences in current clinical unit	This outcome will be measured by the 4-point Likert scale, with scores ranging from 1 (strongly disagree) to 4 (strongly agree).	from the beginning of the study to the 6th month later
Secondary	Comments and suggestions of the system	Ward staff's opinions will be collected by a semi-structured interview.	from the beginning of the study to the 6th month later

External Links

•   Nielsen, J. (2012, June 4). How Many Test Users in a Usability Study?