Adrenergic blockade | Electric impulse frequency | |||
---|---|---|---|---|
3 Hz | 20 Hz | |||
None | None | Alpha | Alpha plusbeta | |
mm Hg min | ||||
Saline | 35 ± 10 | 311 ± 42 | 92 ± 14 | 176 ± 36 |
BIBP 3226 | 24 ± 6 | 147 ± 212-a | 38 ± 92-b | 62 ± 162-c |
1229U91 | N.D. | N.D. | 44 ± 132-b | N.D. |
Values are mean ± S.E.M. of five to eight determinations.
↵2-a P < .001 vs. saline 20 Hz unblocked byt test.
↵2-b Intergroup differences in alpha-blocked rats: P < .013 by ANOVA, P < .05 vs. saline by Tukey’s test.
↵2-c P = .013 vs. saline 20 Hz alpha- and beta-blocked by t test.
N.D., not determined.