Document Classification

Section Type: RESULTS

Text: Metoprolol induced significant changes in the following parameters (baseline versus metoprolol) : high-frequency peak 9 + / - 4 versus 11 + / - 4 ms (p < 0. 001), low-to-high frequency ratio 2. 5 + / - 0. 6 versus 1. 9 + / - 0. 6 (p < 0. 0001), root mean square of RR interval difference 23 + / - 7 versus 31 + / - 9 ms (p < 0. 0001), RR intervals differing more than 50 ms from the preceding one 4. 8 + / - 3. 9 versus 10. 0 + / - 7. 0 % (p < 0. 0001), mean of all 5-min standard deviations 50 + / - 12 versus 56 + / - 11 ms (p < 0. 001) and mean RR interval 819 + / - 90 versus 1, 019 + / - 120 ms (p < 0. 00001).