Clinical comparison of a new smart wearable wireless heart rate and
SpO2 monitoring system with standard monitoring in the ICU: a pilot
Authors: S. Murali, F. Rincon, T. Cassina, S. Cook, J. J. Goy
Accepted for publication in JMIR 2020.
Background: Continuous cardiac monitoring with wireless sensors is attractive for early detection of arrhythmia and conduction disturbances, and to prevent adverse events leading to patient deterioration. We present a new sensor design (SmartCardia), a wearable wireless biosensor patch, for continuous cardiac and SpO2 monitoring. Methods: We performed an observational study, HR and SpO2 of patients admitted in the ICU. A comparison of the device under test (SmartCardia, Lausanne,Switzerland) and the unit grade monitoring system (Dräger-Healthcare, Lübeck, Germany) of the ICU was done. We estimated a 95% limits of values agreement as reasonable. Data loss and discrepancy between the 2 systems were critically analyzed. Results: Fifty-eight patients (42 men and 16 women) with a mean age of 71±11 years hospitalized in the ICU were included. A total of 13.49 ± 5.53 hours per patient were recorded. This represents a total recorded period of 782.29 hours. The mean difference and standard deviation between the HR detected by the SmartCardia patch and the ICU monitor was 6± 13 bpm or 8 ± 19 % of heart rate. For SpO2, the average difference and standard deviation was 3.9 ± 2.9 %. SmartCardia’s patch measures SpO2 only under low to no activity condition and does not report a value otherwise. Data loss and non- interpretable values of SpO2 represent 26 ± 24 % of the total number of values. Conclusion: SmartCardia device demonstrated clinically acceptable accuracies for HR and SpO2 monitoring in ICU patients.
Robust Estimation of Apnea-Hypopnea Index using a Wearable Patch
Authors: S. Yazdani, S. Baumann, R. Braojos, F. Rincon, S. Murali
This study presents SmartWearable, a health-monitoring patch that can be used to estimate the apnea/hypopnea index (AHI) as a replacement to the cumbersome conventional polysomnography (PSG) that is currently under practice. SmartWearable provides a more comfortable solution and removes the necessity of laboratory dependent recording scenarios, while offering 88.71% accuracy to detect moderate and severe apnea, similarly to PSG.