sympathetic nerve blockade with guanethidine ( 15 mg/kg ) significantly reduced the slope of the mean arterial blood pressure-heart period relationship in sbn rats to 0.45 +/- 0.05 ms/mmhg ( p less than 0.01 ) and increased the pressor response to phenylephrine , without having any effect on these parameters in sbh rats .
C0031469
phenylephrine
C0020538
sbh