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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: J Thorac Cardiovasc Surg. 2009 Sep 9;139(2):444. doi: 10.1016/j.jtcvs.2009.04.056

Figure 4.

Figure 4

Change in heart rate variability. SDNN, standard deviation of normal RR intervals; rMSSD, root mean square of standard deviation; HF, high frequency power; LF, low frequency power.