Accuracy of Evie Ring Pulse Oximeter in Profound Hypoxia

NCT ID: NCT06101654

Last Updated: 2024-03-13

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 11 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2024-01-09
• Study Completion Date: 2024-01-10

Brief Summary

The goal of this study was to evaluate the accuracy of pulse oximeters over the range of 70-100% per ISO 80601-2-61:2019. Four devices were placed on each subject with two on each index finger at the base and two on each index finger at the fingertip. SpO2 measurements from these devices were compared to sampling of arterial blood during brief stable oxygen desaturation in healthy volunteers to evaluate the claimed range.

Detailed Description

The study is an open enrollment, single-center, single blinded design using the investigational ring compared to arterial blood gas measurements (SaO2) and to two commercially available hospital grade reference pulse oximeters (Massimo Radical-7 and Nellcor N-595). To be included in the study, subjects had to meet all the inclusion criteria and not meet any of the exclusion criteria and to sign the written consent. Demographic data were obtained.

The investigational (4/subject) and reference devices were placed. A radial arterial cannula was placed in either the left or right wrist of each subject for arterial blood sampling and blood pressure monitoring. Each subject had two control blood samples taken at the beginning of each experiment, while breathing room air. Hands with test devices and reference pulse oximeters were maintained motionless on arm boards throughout the test. Hypoxemia was then induced to different and stable levels of oxyhemoglobin saturation (between 70-100%) by having subjects breathe mixtures of nitrogen, air, and carbon dioxide. The mixture of gases was controlled by the study physician by adjusting gas flows according to breath-by-breath estimates of oxygen saturation calculated from end-tidal partial pressure of oxygen (PO2) and partial pressure of carbon dioxide (PCO2). Each plateau level of oxyhemoglobin saturation was maintained for at least 30 seconds or until readings were stable. Two arterial blood samples were then obtained, approximately 30 seconds apart. Each stable plateau was maintained for at least 60 seconds with SpO2 fluctuating by less than 2-3%. All investigational, control, and reference data were recorded.

Conditions

Hypoxia

Study Design

• Observational Model Type: CASE_ONLY
• Study Time Perspective: PROSPECTIVE

Study Groups

Healthy Adult Volunteers

Minimum of ten (10) subjects meeting the eligibility criteria.

Pulse oximeter

Intervention Type: DEVICE

Devices (4) were placed on the finger and the fingertip of both index fingers. Blood samples were taken at each stable level of oxygenation.

Interventions

Pulse oximeter

Devices (4) were placed on the finger and the fingertip of both index fingers. Blood samples were taken at each stable level of oxygenation.

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

Subject is in good general health with no evidence of any medical problems. Subject is fluent in both written and spoken English. Subject provided written informed consent and is willing to comply with the study procedures.

Subject is willing to have their skin color assessed.

Exclusion Criteria

Subject is obese with a BMI over 30. Subject has a known history of heart disease, lung disease, kidney or liver disease.

Subject has asthma, sleep apnea, or uses a CPAP. Subject has diabetes. Subject has a clotting disorder, anemia, or in the opinion of the investigator, they would be unsuitable for participation.

Subject has any other serious system illness. Subject is a current smoker. Subject has any injury, deformity, or abnormality at the sensor sites that, in the opinion of the investigator, would interfere with the sensors working correctly.

Subject has a history of fainting or vasovagal response. Subject has a sensitivity to local anesthesia. Subject has Raynaud's disease. Subject has unacceptable collateral circulation based on an exam by the investigator.

Subject is pregnant, lactating, or trying to get pregnant. Subject is unable or unwilling to provide informed consent or is unable or unwilling to comply with the study procedures.

Subject has any other condition, which in the opinion of the investigator, would make them unsuitable for the study.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 49 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of California, San Francisco

OTHER

Sponsor Role: collaborator

Movano Health

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Philip Bickler, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

University of California at San Francisco (UCSF)

Locations

Hypoxia Research Laboratory

San Francisco, California, United States

Countries

United States

Other Identifiers

MOVA05

Identifier Type: -

Identifier Source: org_study_id