LF/HF at baseline and CHF.

<p>(A) Summarized data for mean LF/HF at baseline, 240 days and 720 days after AC. Mean LF/HF is average of every 3 hours. (B) Histogram of average 24-hour LF/HF at baseline, 240 days and 720 days after AC (**, p<0.01 vs baseline). (C) Histogram of Δ LF/HF at baseline, 240 days and 720 days after AC (*, p<0.05 vs baseline). Δ LF/HF represents the increased average LF/HF at 6 AM-noon vs midnight-6 AM.