Table 3
Blood pressure, RR interval, and RR variability during infusion of phenylephrine or angiotensin II, each with sodium nitroprusside
| Phenylephrine | Angiotensin II | p value | |
|---|---|---|---|
| Blood pressure (mm Hg) | 91 (12) | 88 (9) | NS |
| RR interval (ms) | 1057 (163) | 864 (117) | < 0.001 |
| SDNN (ms) | 93 (25) | 86 (35) | NS |
| IQDNN (ms) | 178 (94) | 129 (62) | NS |
| IQDSD (ms) | 126 (59) | 65 (42) | 0.004 |
| RMSSD (ms) | 90 (40) | 63 (39) | 0.04 |
| pNN50 (%) | 57 (21) | 30 (16) | < 0.001 |
| Total power (ms2) | 16 361 (13 341) | 10 776 (9819) | NS |
| LF power-abs (ms2) | 930 (829) | 1748 (1288) | < 0.05 |
| LF power (nu) | 0.15 (0.11) | 0.45 (0.21) | 0.005 |
| HF power-abs (ms2) | 4717 (3672) | 2763 (4201) | NS |
| HF power (nu) | 0.66 (0.26) | 0.48 (0.19) | < 0.05 |
-
Values are mean (SD).
-
abs, absolute units; HF, high frequency; IQDNN, interquartile differences in frequency distributions of the total number of RR intervals; IQDSD, interquartile differences in frequency distributions of successive RR interval differences; LF, low frequency; pNN50, percentage of successive RR interval differences exceeding 50 ms; RMSSD, root mean square of successive RR interval differences; SDNN, standard deviation of RR interval values.
