Smartphone-Derived Seismocardiography: Robust Approach for Accurate Cardiac Energy Assessment in Patients with Various Cardiovascular Conditions
Executive Summary
This study evaluates the reliability of smartphone-derived seismocardiography (SCG) for assessing cardiac kinetic energy in 220 patients with diverse cardiovascular conditions. The methodology included simultaneous measurements with a validated device and smartphones, clinician versus patient recordings, and at-home self-recordings over three months. Results demonstrated high reliability (ICC > 0.8) for smartphone-derived SCG metrics compared to a validated device, with moderate patient compliance (41.4%) for at-home recordings. These findings validate the potential of smartphone-based SCG for telemedicine applications in cardiovascular monitoring.
Answer Machine Insights
Q: How reliable are smartphone-derived SCG metrics compared to a validated device?
Smartphone-derived SCG metrics demonstrated high reliability with ICC values greater than 0.8.
Our study demonstrates that kinetic energy metrics derived from SCG computed on signals acquired with a device validated in previous studies are comparable with an ICC on average greater than 0.8.
Q: What was the compliance rate for at-home SCG recordings?
The compliance rate for at-home SCG recordings was 41.4%.
Out of 220 recruited patients, 138 possessed smartphones that met the specific requirements for the study. These 138 participants were expected to complete a cumulative total of 4968 recordings at home. However, they collectively completed 2058 recordings, resulting in a mean compliance rate of 41.4%.
Key Results
Smartphone-derived SCG metrics showed high reliability compared to a validated device, with ICC values > 0.8.
Patient-acquired SCG metrics were also reliable, with ICC > 0.83 for clinician versus patient recordings.
Visual Evidence
Clinical Snapshot
Evidence Rating
Relevance
high Priority