Respiratory Event-Induced Blood Pressure Oscillations Vary by Sleep Stage in Sleep Apnea Patients

Figure 4

Illustration of the estimation of the rate of rise in blood pressure during an apnea event. The line resulting from fitting equation to the points designated with red and green circles. The blood pressure amplitude at the start of the event (i.e., at red point) has a magnitude that is equal to the average of the SBP value at the start of the event and four preceding sample values of SBP. The small green circle located on the peak of SBP has the magnitude that is equal to the average of the peak SBP together with two preceding and two succeeding SBP samples.