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Obstructive sleep apnea (OSA) is a sufficiently common disease that may negatively affect high-quality sleeping. Reduction in muscle strain of body and laxity in the respiratory tract during sleeping can cause apnea in sleep period. OSA decreases blood oxygen saturation and increases effort to breathe to cause arousal via reaction of neurologic mechanisms, indicating that it induces autonomic imbalance...
Nowadays, the advance in sensors network, integrated circuit and wireless communication technologies giving capability of designing lightweight and low-cost sensor nodes particularly for healthcare application. In this paper, a wearable belt-type ECG electrode worn around the chest is designed for sake of the convenience to measure real-time ECG. The measured ECG signals carry a lot of clinical information...
The pulse transit time (PTT) can be measured between the ECG R peak and the linger pulse and this method is a simple, non-invasive measurement. PTT is influenced by heart rate, blood pressure changes and the compliance of the arteries, but few quantitative data are available describing the factors which influence PTT. The aim of this study was to investigate the relationship between the heart rate...
To investigate the effect of PSD of HRV and DFA of EEG on autonomic nervous system activity and central nervous activity during general anesthesia. Fifteen ASA physical status I and II patients scheduled for TAH(Total Abdominal Hysterectomy). Patients were received to sadation with sevoflurane. The PSD(power spectrum density) of HRV(heart rate variability) and DFA(detrended fluctuation analysis) of...
Lately, Advancement in wireless technology and biomedical sensor nodes provide a good platform for ubiquitous healthcare development. In this paper, we propose a brand new concept for ballistorcardiogram(BCG) monitoring system which is implementing wireless sensor node to transmit BCG signal to a base station in hospital for long term monitoring and easy BCG analysis purpose. We design a chair type...
The abstract is to be in an analysis on the conventional the blood pressure estimation method using an oscillometric sphygmomanometer was performed through a computer simulation using an arterial pressure-volume (APV) model. Traditionally, the maximum amplitude algorithm (MAP) was applied on the oscillation waveforms of the APV model to obtain the mean arterial pressure and the characteristic ratio...
An optic module system is developed adopting multiple colorimetry units for the measurement of multi-pad urinalysis dipsticks. Multiple photometry system instead of moving mechanisms has the advantages of system reliability and simplicity as well as economic aspects due to the recent development of economic color light emitting diodes and stable photo sensors. An integration amplifier with programmable...
Pulse wave velocity has widely been used in the evaluation of atherosclerosis. In this study, we observed the change of pulse wave velocity according to characteristic points of pressure pulse waves which were recorded at brachial and radial artery. In order to evaluate the versatility of determination of the transit time between two points of measuring site, we measured PWV in seven methods : (1)...
The analysis of an arterial stiffness is essential for estimating the cardiovascular disease. Many indices suck as pulse transit time (PTT), reflection index (RI), stiffness index (ST) and characteristic impedance (Zc) are introduced to assess arterial stiffness. The purpose of this study is to analyze the variation aspect of PTT and the vascular characteristic index according to the posture change...
A wireless intraoral pH telemetry system for salivary and plaque pH measurement was developed and examined. The actual size of intraoral pH telemeter unit is 8 mm x 16 mm x 2 mm including a rechargeable battery for more than 24 hours measurement. The unit was covered with polyurethane for waterproofing and was applied to the exterior teethridge of a volunteer. The intraoral acidity of the volunteer...
The aged are faced with increasing risk for falls. The aged have the easily fragile bones than others. When falls have occurred, it is important to detect this emergency state because such events often lead to more serious illness or even death. A implementation of PDA system, for detection of emergency situation, was developed using 3-axis accelerometer in this paper as follows. The signals were...
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