Mean arterial pressure estimation method using morphological changes in oscillometric waveform

Oscillometric method is the method for the blood pressure measurement using mean arterial pressure (MAP). In the conventional method, the cuff pressure at the largest pulse is determined as MAP. However, it is difficult to find the largest oscillometric pulse from patients who have the cardiovascular disease or the elder subjects. Therefore, we studied a new method to determine the MAP by analyzing the changes of the morphology of oscillometric pulse different from above method. The new method was applied to the cuff pressure recorded by 11 healthy subjects. Two observers trained by BHS program measured the blood pressure using the auscultatory method to determine the reference MAP. The mean difference and standard deviation of the MAP determined by the algorithm proposed by this study were 1.45 mmHg and 3.47 mmHg respectively.