Publications by authors named "Kuan-Jen Wang"
Assessment of a Calibration-Free Method of Cuffless Blood Pressure Measurement: A Pilot Study.
IEEE J Transl Eng Health Med
January 2024
Unlabelled: This study proposes a low-cost, high-sensitivity sensor of beat-to-beat local pulse wave velocity (PWV), to be used in a cuffless blood pressure monitor (BPM).
Objective: We design an adaptive algorithm to detect the feature of the pulse wave, making it possible for two sensors to measure the local PWV in the radial artery at a short distance. Unlike the cuffless BPM that needs to use a regression model for calibration.
Article Synopsis
- The study introduces a new small, cuffless blood pressure (BP) monitoring device that uses a combination of a piezoelectric sensor array and an optical sensor to continuously assess BP through physiological signals from the radial artery.
- By employing the Moens-Korteweg equation, the device estimates BP by correlating pulse wave velocity (PWV) with arterial compliance, combining data from multiple sensors to enhance accuracy.
- Results from testing the device on 20 participants showed that both the regression model and the P-β model methods complied with established standards for BP estimation, indicating the potential for improved accuracy in monitoring blood pressure.
Previous studies have found that the non-invasive blood pressure measurement method based on the oscillometric method is inaccurate when an arrhythmia occurs. Therefore, we propose a high-sensitivity pulse sensor that can measure the hemodynamic characteristics of the pulse wave and then estimate the blood pressure. When an arrhythmia occurs, the hemodynamics of the pulse wave are abnormal and change the morphology of the pulse wave.
View Article and Find Full Text PDFWe have utilized ultrafast optical spectroscopy to study carrier dynamics in slightly underdoped (BaK)Fe2As2 crystals without magnetic transition. The photoelastic signals due to coherent acoustic phonons have been quantitatively investigated. According to our temperature-dependent results, we found that the relaxation component of superconducting quasiparticles persisted from the superconducting state up to at least 70 K in the normal state.
View Article and Find Full Text PDFBackground: Anesthesiologist-directed anesthetic preoperative evaluation clinic (APEC) is used to prepare patients to receive anesthesia for surgery. Studies have shown that APEC can reduce preoperative tests, consultations, surgery delays and cancellations. APEC with video-teaching has been purposed as a medium to provide comprehensive information about the process of anesthesia but it has not been practiced in small groups of patients.
View Article and Find Full Text PDFBackground: Brain damage is a serious complication of cardiac anesthesia. The purpose of this study was to detect brain damage at different surgical stages during coronary artery bypass graft with or without cardiopulmonary bypass.
Methods: We conducted a prospective, longitudinal study to evaluate serum S-100 beta protein, an early marker of brain injury, in patients electively undergoing off-pump (n = 30) or traditional coronary artery bypass graft (n = 60).