Fig. 9. Muscle sympathetic activity (MSA) and arterial pressure during induction of anesthesia with a bolus dose of methohexital.  Bottom panels show selected passages of records from  top panels on an expanded time scale. Note inhibition of nerve traffic with induction despite decreased arterial pressure and sympathetic activation during intubation. Therefore, methohexital anesthesia clearly reduces MSA, but the sympathetic nervous system can still be activated at least to some extent,  e.g. , by tracheal intubation or surgical stress. Derived from and used with permission from Sellgren  et al. 145