Key result
50 Hz kinocardiography metrics match 1 kHz signals with ~0.1% mean difference.
Why the study?
Kinocardiography is a promising technique to monitor cardiac mechanical function remotely, but the effects of acquisition device, sampling rate, and record length on its metrics during haemodynamic changes were unclear.
Can kinocardiography metrics be reliably acquired using different sensors, at 50 Hz, and with varying record lengths in healthy males?
Cross-Sectional (n=12)
No
Can kinocardiography metrics be reliably acquired using different sensors, at 50 Hz, and with varying record lengths in healthy males?
Kinocardiography metrics can be robustly acquired at 50 Hz using different sensors with record lengths over 60 seconds, suggesting its potential as a non-invasive method to monitor cardiac inotropic activity.
BACKGROUND: Kinocardiography (KCG) is a promising new technique used to monitor cardiac mechanical function remotely. KCG is based on ballistocardiography (BCG) and seismocardiography (SCG), and measures 12 degrees-of-freedom (DOF) of body motion produced by myocardial contraction and blood flow through the cardiac chambers and major vessels. RESULTS: The integral of kinetic energy ([Formula: see text]) obtained from the linear and rotational SCG/BCG signals was computed over each dimension over the cardiac cycle, and used as a marker of cardiac mechanical function. We tested the hypotheses that KCG metrics can be acquired using different sensors, and at 50 Hz. We also tested the effect of record length on the ensemble average on which the metrics were computed. Twelve healthy males were tested in the supine, head-down tilt, and head-up tilt positions to expand the haemodynamic states on which the validation was performed. CONCLUSIONS: KCG metrics computed on 50 Hz and 1 kHz SCG/BCG signals were very similar. Most of the metrics were highly similar when computed on different sensors, and with less than 5% of error when computed on record length longer than 60 s. These results suggest that KCG may be a robust and non-invasive method to monitor cardiac inotropic activity. Trial registration Clinicaltrials.gov, NCT03107351. Registered 11 April 2017, https://clinicaltrials.gov/ct2/show/NCT03107351?term=NCT03107351&draw=2&rank=1 .
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Hossein et al. (2021) conducted a cross-sectional in Healthy (n=12). Kinocardiography at 50 Hz sampling rate and varying record lengths vs. Kinocardiography at 1 kHz sampling rate and 90-second record length was evaluated on Agreement between KCG metrics acquired at 50 Hz versus 1 kHz. Kinocardiography metrics computed from 50 Hz and 1 kHz signals were highly similar with less than 0.1% mean difference, and a 60-second record length was sufficient to achieve less than 5% error.
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