• Andrea Donelli, Jos R C Jansen, Bas Hoeksel, Paolo Pedeferri, Ramzi Hanania, Jan Bovelander, Francesco Maisano, Alessandro Castiglioni, Alfieri Ottavio, and Jan J Schreuder.
• Department of Cardiac Surgery, San Raffaele University Hospital, Milan, Italy.
• J Clin Monit Comput. 2002 Apr 1; 17 (3-4): 181-5.

AbstractA novel algorithm for real-time detection and prediction of the dicrotic notch from aortic pressure waves was evaluated in arrhythmic aortic pressure signals from heart failure patients. A simplified model of the arterial tree was used to calculate real-time aortic flow from aortic pressure. The dicrotic notch was detected at the first negative dip from the calculated flow, prediction of the notch was performed using a percentage of the decreasing flow. The performance of the real-time dicrotic notch detection algorithm (RTDND) was evaluated during severe arrhythmia from aortic pressure signals of 12 patients. The RTDND was able to detect the dicrotic notch in 98.1%. No false positive dicrotic notch identifications were observed. Prediction of the dicrotic notch was tested at 40%, 20%, and 0% of the decreasing calculated aortic flow. The mean time-delays to the notch were 68 +/- 14 ms, 55 +/- 12 ms, and 43 +/- 8 ms, respectively. Given these small variability, intra-beat prediction of the dicrotic notch may be used for real-time intra-aortic balloon counterpulsation inflation timing.

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