Key result
Vivio wireless tonometer captures comparable carotid pulse waveforms to SphygmoCor with 0.82 augmentation index correlation.
Why the study?
To introduce Vivio, a wireless optical tonometer, and compare its pulse waveform measurement capabilities to the AtCor SphygmoCor.
Does the Vivio wireless optical tonometer provide comparable carotid pulse waveform measurements to the AtCor SphygmoCor in a heterogeneous cohort?
Cross-Sectional (n=29)
No
Does the Vivio wireless optical tonometer provide comparable carotid pulse waveform measurements to the AtCor SphygmoCor in a heterogeneous cohort?
The Vivio wireless optical tonometer provides carotid pulse waveform measurements comparable to the established AtCor SphygmoCor device, offering a potential mobile healthcare tool for noninvasive cardiovascular monitoring.
Answers are grounded in this paper and cite their sources.
May support portable carotid waveform monitoring in practice; leaves open prospective validation before clinical adoption.
OBJECTIVE: Here we introduce Vivio, a wireless optical tonometer, and compare its pulse waveform measurement capabilities to the AtCor SphygmoCor. APPROACH: Pulse waveform data from both devices was captured on a heterogeneous cohort of 29 participants (15 males, 14 females), including 16 healthy individuals free from cardiovascular diseases and 13 patients with one or more cardiovascular diseases. These participants were a subgroup of the Huntington Medical Research Institutes (HMRI) iPhone Heart Study. Main r esults: Carotid pulse waveforms captured by Vivio were comparable to those captured using the AtCor SphygmoCor tonometer. The point-by-point root-mean-square error between averaged waveforms captured by either device on the same participant was 6.3% with a standard deviation of 2%. The harmonic content of the pulse waveforms captured by either device was also similar. Data collected by Vivio displayed good to excellent agreement across a wide range of pulse waveform features such as left ventricular ejection time, reflected wave arrival time, the ratio of systolic to diastolic time intervals, and heart rate. A comparison between augmentation index (AI) measured by Vivio and tonometry showed a correlation of 0.82 (p < 0.01). Bland-Altman analysis of this data yielded a bias of -2.5% and limits of agreement spanning -15.1%-10.1%. SIGNIFICANCE: The Vivio has the potential to enhance the availability of noninvasive pulse waveform data, thereby expanding the tools available for the diagnosis and monitoring of cardiovascular disease. When used in combination with advanced waveform analysis methods, Vivio can impact mobile healthcare resulting in improved patient health, quality of life and the overall reduction of healthcare costs.
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Rinderknecht et al. (2020) conducted a cross-sectional in Healthy individuals and patients with cardiovascular diseases (n=29). Vivio wireless optical tonometer vs. AtCor SphygmoCor tonometer was evaluated on Augmentation index (AI) correlation (Correlation 0.82, p=< 0.01). The Vivio wireless optical tonometer captured carotid pulse waveforms comparable to the AtCor SphygmoCor, showing an augmentation index correlation of 0.82 and a bias of -2.5%.
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