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. Author manuscript; available in PMC: 2010 Aug 25.
Published in final edited form as: J Am Coll Cardiol. 2009 Aug 25;54(9):840–850. doi: 10.1016/j.jacc.2009.06.008

Figure 6. QT-RR Coherence Changes Between Baseline and CHF.

Figure 6

Graph showing cross-spectral analysis (coherence) in the 6 ambulatory dogs. Note that baseline coherence increases as a function of the increase in spectral sympathetic nerve activity. In the box plots, the central line represents the median distribution. Each box spans from 25th to 75th percentile points, and error bars extend from 10th to 90th percentile points. CHF = congestive heart failure; iSGNA = integrated stellate ganglion nerve activity.