Key result
An impedance plethysmography (IPG) ring demonstrated a stronger correlation with changes in systolic blood pressure after exercise compared to a photo-plethysmography sensor (r = 0.700 vs. r = 0.450).
Why the study?
Does an impedance plethysmography (IPG) ring improve the correlation between pulse transit time and systolic blood pressure changes compared to a photo-plethysmography (PPG) sensor in healthy subjects?
Observational (n=20)
Does an impedance plethysmography (IPG) ring improve the correlation between pulse transit time and systolic blood pressure changes compared to a photo-plethysmography (PPG) sensor in healthy subjects?
Effect estimate: r = 0.700 vs r = 0.450
An IPG ring provides a more accurate estimation of systolic blood pressure changes based on pulse transit time compared to traditional PPG sensors, suggesting potential for wearable cuffless blood pressure monitors.
IPG rings may enhance PTT-SBP correlation versus PPG in healthy volunteers; leaves open validation for cuffless monitoring in patients.
In the last decade, cuffless blood pressure measurement technology has been widely studied because it could be applied to a wearable apparatus. Electrocardiography (ECG), photo-plethysmography (PPG), and phonocardiography are always used to detect the pulse transit time (PTT) because the changed tendencies of the PTT and blood pressure have a negative relationship. In this study, the PPG signal was replaced by the impedance plethysmography (IPG) signal and was used to detect the PTT. The placement and direction of the electrode array for the IPG measurement were discussed. Then, we designed an IPG ring that could measure an accurate IPG signal. Twenty healthy subjects participated in this study. The changes in blood pressure after exercise were evaluated through the changes of the PTT. The results showed that the change of the systolic pressure had a better relationship with the change of the PTTIPG than that of the PTTPPG (r = 0.700 vs. r = 0.450). Moreover, the IPG ring with spot electrodes would be more suitable to develop with the wearable cuffless blood pressure monitor than the PPG sensor.
No takes yet. Share an insight, caveat, or question.
Liu et al. (2017) conducted an observational in Healthy subjects (n=20). Impedance plethysmography (IPG) ring vs. Photo-plethysmography (PPG) sensor was evaluated on Relationship between change in systolic pressure and change in pulse transit time (PTT) after exercise (r = 0.700 vs r = 0.450). An impedance plethysmography (IPG) ring demonstrated a stronger correlation with changes in systolic blood pressure after exercise compared to a photo-plethysmography sensor (r = 0.700 vs. r = 0.450).