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Updated: Jan 31, 2026

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Vortex Whistle and Smart Phone Application for Peak Flow Recordings in Asthmatic Children: A Feasibility Study

Ingvild Bruun Mikalsen1,2, Damoun Nassehi3, Knut Øymar1,2

  • 1Department of Pediatrics, Stavanger University Hospital, Stavanger, Norway.

Telemedicine Journal and E-Health : the Official Journal of the American Telemedicine Association
|December 21, 2018
PubMed

Insights

This study introduces a novel asthma monitoring device that uses sound to measure Peak Expiratory Flow (PEF). The Blowfish device offers a user-friendly way for children to track their asthma control at home.

Area of Science:

  • Pediatric Pulmonology
  • Biomedical Engineering
  • Digital Health

Background:

  • Asthma management in children requires accurate and accessible monitoring tools.
  • Current methods for measuring Peak Expiratory Flow (PEF) can be cumbersome for pediatric patients.
  • Digital health solutions offer potential for improved patient engagement and data collection.

Purpose of the Study:

  • To evaluate a novel sound-based device for measuring PEF in children with asthma.
  • To assess the usability and parental satisfaction with the Blowfish device and its accompanying application.
  • To explore the correlation between sound-based PEF measurements and validated asthma control questionnaires.

Main Methods:

  • Children inhaled deeply and exhaled into the Blowfish device, producing a sound recorded by an application.
  • Mathematical algorithms converted the sound to PEF values, which were uploaded to a server.
  • Asthma control was assessed using the Pediatric Asthma Quality of Life Questionnaire and the Childhood Asthma Control Test.

Main Results:

  • The Blowfish device successfully recorded sound and converted it to PEF measurements.
  • Parents provided feedback on the device and application usability.
  • Data on pediatric asthma quality of life and asthma control were collected.

Conclusions:

  • The Blowfish device presents a potentially innovative approach to pediatric asthma monitoring.
  • Further research is needed to validate the accuracy and clinical utility of sound-based PEF measurement.
  • The device shows promise for home-based asthma management and patient-reported outcomes.

Keywords:
asthmachilde-healthpeak expiratory flowsmart phone applicationtelemedicinetelemonitoring

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