Fig. 3From: Impact of a combination of pimobendan, furosemide, and enalapril on heart rate variability in naturally occurring, symptomatic, myxomatous mitral valve degeneration dogsExamples of power spectral density of one dog with MMVD stage C at the baseline and after treatment with a combination of pimobendan, furosemide, and enalapril at 1 (M1), 3 (M3), and 6 (M6) months; the Y-bar represents power spectral density at 500 ms2 and the X-bar represents a frequency range of 0–0.5 Hz. The dashed line represents the separation between each frequency range (i.e., low frequency, 0.041–0.15 Hz; high frequency, 0.15–0.5 Hz)Back to article page