Table 3. Comparisons of the time-domain analysis indicators before and after the drug administration.
| Indicators in each protocol | Pre | Post | T | |||
| median | range | median | range | |||
| Propranolol | ||||||
| SDNN (ms) | 326.64 | 163.46~488.70 | 326.20 | 150.85~480.82 | 3.00 | |
| PNN50 (%) | 74.08 | 65.89~81.27 | 76.59 | 62.88~84.62 | 2.00 | |
| RMSSD (ms) | 353.91 | 169.50~571.09 | 427.40 | 143.78~549.93 | 3.00 | |
| Atropine | ||||||
| SDNN (ms) | 320.25 | 192.30~448.19 | 26.49 | 7.85~82.03 | 0.00a | |
| PNN50 (%) | 78.09 | 70.90~90.97 | 1.17 | 0.00~7.02 | 0.00a | |
| RMSSD (ms) | 345.78 | 240.39~495.82 | 24.48 | 7.04~55.83 | 0.00a | |
| Propranolol–atropine | ||||||
| SDNN (ms) | 255.61 | 156.74~444.10 | 25.42 | 12.08~61.21 | 0.00a | |
| PNN50 (%) | 73.24 | 58.53~84.62 | 0.00 | 0.00~10.37 | 0.00a | |
| RMSSD (ms) | 274.93 | 170.93~466.92 | 11.08 | 7.69~81.70 | 0.00a | |
All the data are expressed as the median and range
aValue is significantly (T = 0) different before and after the drug administration
PNN50 = percentage of normal RR intervals that differed by 50 ms; RMSSD = root mean square of the successive RR interval differences; SDNN = standard deviation of all the RRIs