Der Einflu� von Stickoxydul und Chloralose-Urethan auf den Kreislauf und die pr�ganglion�re Sympathicusaktivit�t der Katze

Arterial pressure, heart rate, preganglionic discharges of the cervical sympathetic nerve and action potentials of the phrenic nerve were recorded in 10 cats under four different conditions: fully conscious (artificial respiration with air, relaxation with suxamethonium), in analgesia (artificial respiration with 66.6% nitrous oxide in oxygen) and in chloralose-urethan anaesthesia (40 mg/kg and 200 mg/kg i.v., respectively) alone or in combination with nitrous oxide. In 10 control experiments cats received nitrous oxide in oxygen during a period of 160 min. In addition, 11 experiments were performed to compare the effects of 66.6% with those of 75% nitrous oxide. The above parameters were recorded both during rest and during acoustic stimulation or asphyxia.