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Figure 3 Twenty-four hour variation of low frequency to high frequency ratio (LF:HF) at baseline (placebo) and after treatment with beta-blocker (bisoprolol) and angiotensin-converting enzyme inhibitor (quinapril). Points represent mean values; figures are the standard deviation for each data point. P1 = placebo; BB = beta-blocker; ACEI = angiotensin-converting enzyme inhibitor.
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