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Qualitative and quantitative evaluation of a new wearable device for ECG and respiratory Holter monitoring

      Highlights

      • New wearable complete cardiorespiratory monitoring
      • 12-Lead ECG system and 5 respiratory sensors ambulatory simultaneous recording
      • Excellent quality of ECG and respiratory signals

      Abstract

      Background

      Recent advances in wearable technology make continuous cardiorespiratory monitoring possible, with potential applications in assessment of cardiopulmonary patients, healthy subjects and athletes. The aim of the present study was to qualitatively and quantitatively evaluate a new wearable device (Learn Inspire Free Entertain = L.I.F.E.) by embedding in a compression shirt a 12‑lead ECG system and 5 respiratory sensors.

      Methods

      Thirty cardiorespiratory patients and ten healthy subjects were studied for 24 h during their usual life activities. In 8 healthy subjects, simultaneous measurements of the device and of an ergo-spirometer were performed during different levels of ventilation in five different body positions. The quality of ECG signals in terms of measurability of heart rate, P wave, QRS complex and ST segment, was analyzed by four expert cardiologists/respiratory physiologists using an arbitrary 1–5 scale. The sum of the respiratory signals was used to calculate the respiratory rate, inspiratory time and relative changes of tidal volume. These parameters were compared to ergo-spirometer measurements.

      Results

      Median quality value was >3 for heart rate, QRS complex, ST segment and P wave (except in L3, aVL, aVF, V1 and V2 leads). Median quality of respiratory traces was >4 in patients and between 3 and 4 in healthy subjects. The respiratory monitoring of respiratory rate and inspiratory time was accurate in all body positions. Tidal volumes were underestimated due to a high level of ventilation.

      Conclusions

      The L.I.F.E. device provides an accurate continuous monitoring of cardiorespiratory signals during the 24 h both in normal subjects and cardiorespiratory patients.

      Keywords

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      Linked Article

      • The wireless revolution and cardiorespiratory system monitoring
        International Journal of CardiologyVol. 284
        • Preview
          In recent years the rapid development of smart phones, mobile connectivity and social networks has raised a digital revolution and changed the way of life. Medicine has adopted this way of transforming wirelessly medical data and a new season of medical care has been revealed. New sophisticated algorithms have been used to monitor patients, especially those who suffer from cardiorespiratory diseases [1].
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