Hardware for precise in vivo pulse transmit time CNIBP tests

Monitoring of changes in blood pressure is one the most commonly used medical methods. However as standard procedure it can only be done in discontinuous time intervals. It would be beneficial for diagnostic purposes if it was possible to monitor changes of blood pressure in continuous time intervals. Currently continuous measurement of blood pressure is only possible using invasive methods, which makes the measurement impractical for the doctors and uncomfortable for the patients. Physiologically there is connection between electrical and mechanical heart functions and blood pressure value. The article describes the method of measurement and ECG and PPG signal processing so as to obtain information about pulse wave transit related to value of blood pressure. This value is called pulse transit time - PTT. The measurement set up used for simultaneous receiving of all necessary biosignals and measurement software in LabView environment for signal processing of the acquired data are described here. This method can be a part of body sensor networks. Using this method will optimize the network device for capturing biosignals and current expansion monitored signals.