1. ‘No Touch’ Vitals: A Pilot Study of Non-contact Vital Signs Acquisition in Exercising Volunteers
- Author
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Marek Janusz Bartula, Ihor Olehovych Kirenko, Leo Kobayashi, Katherine Luchette, Cameron Etebari, Laura Mercurio, Mukul Rocaue, Geoffrey A Capraro, Derek Merck, and Kees van Zon
- Subjects
Core (anatomy) ,Respiratory rate ,business.industry ,Oral temperature ,0206 medical engineering ,Vital signs ,02 engineering and technology ,020601 biomedical engineering ,01 natural sciences ,010309 optics ,Photoplethysmogram ,0103 physical sciences ,Thermography ,Heart rate ,Medicine ,Nuclear medicine ,business ,Measure heart rate - Abstract
Accurate non-contact acquisition of patient vital signs will advance emergency care. In order to assess promising candidate technologies., an observational study was conducted with healthy volunteers to test two hypotheses: 1. Video photoplethysmography and motion analysis (vPPG-MA) and infrared thermography (IR) will accurately and concurrently measure heart rate (HR) and respiratory rate (RR)., and body temperature., respectively. 2. Non-contact approaches will exhibit comparable and reliable performance against standard contact cardiorespiratory monitors (CM). HR and RR were measured with CM and vPPG-MA; core and surface temperatures were obtained using oral thermometry and two IR cameras., respectively. Subjects were videorecorded at rest; during sustained exercise at 50%., 60%., and 70% of age-predicted maximum HR; and 1., 3., and 5 min post-exertion. vPPG-MA HR and RR measurements were calculated for video segments corresponding to ED use-cases: Triage (unprimed) 30s check., Routine 30s check, Abbreviated “Spot” 10s check., and Full 60s check. Descriptive statistics and Bland-Altman analyses were performed on vPPG-MA and IR measurements against synchronous CM measurements. Thirty volunteers exhibited a HR range of 43-146bpm., a RR range of 8-29bpm., and an oral temperature range of 96.2-99.5°F on CM. vPPG-MA obtained 972 (98.2% of scheduled) HR and 591 (98.5%) RR measurements; mean differences between Full 60s vPPG-MA and CM were −0.9±5.5bpm (-0.9±5.3%; 95% CI: −11.6–9.8bpm) for HR, and 0.9±3.1bpm (4.8±17.6%; −5.1–6.9bpm) for RR; other video segments performed similarly. IR acquired temperatures ~4°F lower than oral thermometers. vPPG-MA and IR thermography successfully measured select vital signs concurrently. vPPG-MA‘s observed level of agreement with CM, along with temperature offsets identified for IR-based thermometry., have set the foundation for live ED clinical studies.
- Published
- 2018