Power spectrum analysis of the cardiovascular parameter variability in rat vascular pain model

We investigated the dynamics of cardiovascular system in order to search for the characteristic of vascular pain model using power spectrum analysis. The animals were anesthetized with urethane (1.3g/kg, i.p.) and arterial cannula was inserted into a bifurcation of femoral artery. The recording of heartbeats was carried out by chest bipolar lead. Systolic blood pressure went through a transducer from femoral artery and measured it invasively. In the power spectrum density (PSD) of R-R intervals, it was almost the same as that of un-stimulating state at very low frequency (VLF