Sympathetic Neural Outflow During Xenon Anesthesia in Humans

Inclusion Criteria: * Healthy volunteers \> 18 years and \< 65 years of age * ASA physical status I * Legal competence * for whom the consent form has been signed Exclusion Criteria: * Healthy volunteers \< 18 years and \> 65 years of age * Pregnancy, lactation period or missing secure anticonvulsive therapy * Missing legal competence * Participation in other clinical trials * Contraindications as mentioned on §4.3 of the SPCs of LENOXe™ (xénon 100 % v/v) * Any medication especially of Sildenafil (Viagra®) or other potency remedy * Existing relationship of dependency to the sponsor or the investigator