Using Patient-Held Devices to Measure Variations in Resting Heart Rate and Step Count Prior to Presentation With an Acute Illness: International, Multicenter Flash Mob Feasibility Study

Jason G A den Duijn   ¹ , MSc ;   Ahmed A M Hajjaj   ² , MD ;   John Kellett   ³ , MD ;   Erika Frischknecht Christensen   ⁴ , MD, PhD ;   Harm R Haak   ^{5, 6} , MD, PhD ;   Mikkel Brabrand   ⁷ , MD, PhD ;   Christian H Nickel   ⁸ , MD, PhD ;   Prabath W B Nanayakkara   ⁹ , MD, PhD ;   Christian P Subbe   ^{2, 10} , MD ;   Jelmer Alsma   ¹¹ , MD, PhD ;   Safer@Home   ¹² ;   Research Consoritum Acute Medicine (ORCA)   ¹²

¹ Department of Medical Oncology, Erasmus University Medical Center, Rotterdam, The Netherlands

² Department of Acute Medicine, Ysbyty Gwynedd Hospital National Health Service Trust, Bangor, United Kingdom

³ School of Clinical and Biomedical Sciences, University of Greater Manchester, Bolton, United Kingdom

⁴ Center for Prehospital and Emergency Research, Department of Emergency Medicine and Trauma Center, Aalborg Hospital and Aalborg University, Aalborg, Denmark

⁵ Department of Internal Medicine, Máxima Medisch Centrum, Veldhoven, The Netherlands

⁶ Department of Health Services Research, Aging and Long Term Care, Care and Public Health Research Institute School for Public Health and Primary Care, Maastricht, The Netherlands

⁷ Department of Emergency Medicine, Odense University Hospital, Odense, Denmark

⁸ Emergency Department, University Hospital Basel, University of Basel, Basel, Switzerland

⁹ Section of Acute Medicine, Department of Internal Medicine, Amsterdam Public Health Research Institute, Amsterdam University Medical Center Location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

¹⁰ North Wales Medical School, Bangor University, Bangor, The Netherlands

¹¹ Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands

¹² See Acknowledgments