Journal of North Khorasan

Abstract Background & Objectives: It is well known that measuring and monitoring blood pressure continuously is one of the most important problems especially in operating rooms and monitoring devices. Pulse transition time (PTT) is a parameter related to cardiovascular system and is extracted based on ECG and pulse oximetry signals and it can be used to measure continuous blood pressure changes. The aim of this study was to design a method to measure and monitor blood pressure continuously using PTT. Materials & Methods: Continuous recordings of pulse wave and ECG signal were done for 35 participants in 20 different positions using a setup which could record two signals. Finger pulse wave was recorded using photo pulse sensor on the left index finger and ECG in lead I by Ag-AgCl electrode on the chest. PTT was measured as the time interval from the ECG R wave to the peak of the pulse signal in the same cardiac circle. Parameters relating the PTT with blood pressure were estimated using collected data. Results: Results showed that the PTT parameter was correlated with systolic and diastolic blood pressure with correlation coefficients of 0.95 and 0.93, respectively. Therefore, blood pressure was monitored with appropriate accuracy. Conclusion: Hereby, a new noninvasive method was introduced for measuring blood pressure continuously in operating room and during the anesthesia.