Reassure Spot Respiration Rate Accuracy Compared to SOMNOScreen

A Test of the Spot Respiration Rate Accuracy of the New Reassure Device on Human Subjects

A trial conducted within the company with a new non-contact respiration rate (RR) sensor. The device was compared for accuracy in RR measurement with a cleared device, the SOMNOScreen Easy, which uses chest effort bands.

The RR was measured over a short duration on subjects sitting upright in a chair, with the non-contact sensor at various distances from the subject. A total of 20 subjects were tested, from both genders, selected to represent a wide range of age and body mass index

Study Overview

• Status: Completed
• Conditions: Accuracy of Measurement of Respiration Rate

Detailed Description

The Reassure uses Radio Frequency (RF) waves to detect the small movements of the human body due to respiration. The reference device, the SOMNOScreen, uses chest effort bands. The Reassure is non-contact and so more comfortable and convenient for quick RR measurement, in a similar way that an Infra-Red thermometer is compared to a traditional under-the-tongue mercury thermometer.

The aim is to explore the variations in the human body that could have an effect on the radio reflection from the human torso, and thus affect the potential detection and accuracy of breathing rate. Factors that could affect non-contact RF performance are:

• High Body Mass Index (BMI) could potentially reduce the chest wall movement during breathing, or alter the nature of the breathing.
• Elderly, thin skin (ie pensioner with low BMI) may have less RF reflection.
• Female breast tissue may have an effect on detection or accuracy.

This was tested at a number of distances from the non-contact sensor and also with the subject having a thick comforter (duvet) laid across them.

The test conditions were

• Distances of 0.5 m, 1.0m and 1.5m between the subject and the RF sensor.
• Additional test condition of comforter (duvet) on the subject when the distance from subject to sensor is 1.0 m.
• Each test condition carried out twice.

The use of the comforter in one test condition is to confirm that the RR measurement by the Reassure is unaffected by the thickness of clothing or blankets being worn.

• Study Type: Observational
• Enrollment (Actual): 20

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 75 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

20 persons selected to cover the range of age and BMI of 18 to 45

Description

Inclusion Criteria:

• Greater or equal to 18 years old and less than or equal to 75 years old
• BMI within the range of greater or equal to 18 and less than or equal to 45

Study Plan

How is the study designed?

Design Details

• Observational Models: Case-Only
• Time Perspectives: Cross-Sectional

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort
Subjects; All 20 subjects. Selected to have a range of ages (18 to less than 75) and BMI from 18.5 to 45

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Respiration Rate Accuracy	The respiration rate measured contemporaneously by the Reassure and the reference device, SomnoScreen, are compared on a second-by-second basis, over the recording duration. The difference between the two respiration rate measurements (the delta) for all 20 subjects' recordings, in all positions, are plotted on a normal distribution chart, giving 8,800 data points. The distribution chart reveals the mean difference between the two devices' measurements and the Standard Deviation (SD). The measure of success is if the 95% (ie 2SD) of the difference in the respiration rate indicated by the two devices (the delta) is less than 5 breaths per minute. This measure is derived from the peer review paper by Lim et al, cited in the References section	Recording duration of 2 minutes; measurement made after 45 seconds settling time, for at least 60 seconds

Collaborators and Investigators

• Sponsor: ResMed
• Investigators: Principal Investigator: Paul Phillips, MA, MSc, ResMed Sensor Technologies

Publications and helpful links

General Publications

• Lim WS, Carty SM, Macfarlane JT, Anthony RE, Christian J, Dakin KS, Dennis PM. Respiratory rate measurement in adults--how reliable is it? Respir Med. 2002 Jan;96(1):31-3. doi: 10.1053/rmed.2001.1203.

Study record dates

Study Major Dates

• Study Start: January 1, 2015
• Primary Completion (Actual): March 1, 2015
• Study Completion (Actual): March 1, 2015

Study Registration Dates

• First Submitted: April 12, 2016
• First Submitted That Met QC Criteria: April 14, 2016
• First Posted (Estimate): April 15, 2016

Study Record Updates

• Last Update Posted (Actual): April 2, 2021
• Last Update Submitted That Met QC Criteria: March 8, 2021
• Last Verified: March 1, 2021

More Information

Terms related to this study

• Keywords: Respiration rate
• Other Study ID Numbers: D22105-106

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No
• IPD Plan Description: Trial is for device performance validation and only recorded with Clinical Trials.gov as it involved human volunteers. No intent to publish