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DY: Fachverband Dynamik und Statistische Physik

DY 27: Nonlinear Dynamics, Synchronization and Chaos - Part II

DY 27.8: Vortrag

Donnerstag, 3. April 2014, 11:30–11:45, ZEU 160

Characterisation of slow cardiovascular oscillations by synchronisation techniques — •Kathrin Dabelow¹, Jan W. Kantelhardt¹, Alexander Müller², Petra Barthel², and Georg Schmidt² — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg — ²Medizinische Klinik und Deutsches Herzzentrum der Technischen Universität München

Variations of human heart rate and blood pressure, i. e. cardiovascular oscillations, naturally occur in the high-frequency (HF) regime due to influences of the repiratory process. Also at lower frequencies (LF regime) variations can be found but the specific underlying mechanisms are still subject to discussion. We study the phase synchronisation properties of heart rate and blood pressure time series. Firstly, we decompose the frequency spectrum of cardiovascular signals into overlapping bands of logarithmically equal width. Within each band the synchronisation of the signal with a time-shifted copy, as well as the synchronisation between different signals is analysed in order to determine differences between the HF and LF range. In addition, the prognostic power of these methods is evaluated in patients that survived a myocardial infarction.