A pilot study to investigate real-time digital alerting from wearable sensors in surgical patients

Meera Joshi, Hutan Ashrafian, Sonal Arora, Mansour Sharabiani, Kenny McAndrew, Sadia N Khan, Graham S Cooke, Ara Darzi, Meera Joshi, Hutan Ashrafian, Sonal Arora, Mansour Sharabiani, Kenny McAndrew, Sadia N Khan, Graham S Cooke, Ara Darzi

Abstract

Background: Continuous vital sign monitoring may identify changes sooner than current standard monitoring.

Objective: To investigate if the use of real-time digital alerts sent to healthcare staff can improve the time taken to identify unwell patients and those with sepsis.

Design: A prospective cohort study design.

Setting: West Middlesex University Hospital, UK.

Participants: Fifty acutely unwell surgical patients admitted to hospital.

Intervention: Patients wore a lightweight wearable sensor measuring heart rate (HR), respiratory rate (RR) and temperature every 2 min whilst standard intermittent ward monitoring of vital signs was performed by nurses. Digital alerts were sent to healthcare staff from the sensor to a smartphone device. All alerts were reviewed for recruited patients to identify the exact time on the sensor in which deterioration occurred. The time to acknowledgement was then reviewed for each action and an average time to acknowledgement calculated.

Results: There were 50 patients recruited in the pilot study, of which there were vital sign alerts in 18 patients (36%). The total number of vital sign alerts generated in these 18 patients was 51. Of these 51 alerts, there were 7 alerts for high HR (13.7%), 33 for RR (64.7%) and 11 for temperature (21.6%). Out of the 27 acknowledged alerts, there were 2 alerts for HR, 17 for RR and 8 for temperature. The average time to staff acknowledgement of the notification for all alerts was 154 min (2.6 h). There were some patients which had shown signs of deterioration in the cohort. The frequency of routine observation monitoring was increased in 2 cases, 3 patients were referred to a senior clinician and 2 patients were initiated on the sepsis pathway.

Conclusion: This study demonstrates the evaluation of digital alerts to nurses in real time. Although not all alerts were acknowledged, deterioration on the ward observations was detected and actions were taken accordingly. Patients were started on the sepsis pathway and escalation to senior clinicians occurred. Further research is required to review why only some alerts were acknowledged and the effects of digital alerting on patient outcomes.

Trial registration: ClinicalTrials.gov, NCT04638738.

Keywords: Continuous monitoring; Vital signs; Wearable sensors.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2022. The Author(s).

Figures

Fig. 1
Fig. 1
Properties of the wearable sensor
Fig. 2
Fig. 2
An image of the home screen with patients highlighted. All names, bed numbers and vital signs shown in the display are for demonstration purposes and not real patient data. The Sensium® App. Image used with permission from SENSIUM (Abingdon, UK)

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