[Neurohumoral effect of xenon].

Clinical trials were carried out in 44 patients during cholecystectomies. The patients were divided into 2 groups (22 pts each) receiving (1) Xe:O2 (70:30) or (2) N2O:O2 (70:30) + phentanyl (0.1 ml boluses every 20 min).

[Comparative assessment of the hormonal status during N2O and xenon anesthesia using similar methods].

The hormonal status of 38 surgical patients during anesthesia with nitrous oxide and Xe administered by similar methods showed that in contrast to anesthesia with N2O, Xe anesthesia helped not only preserve the adaptive potential, but even increase the defense potential of the organism during surgery. Xe anesthesia was associated with a 1.5 times less requirement in fentanyl, with the levels of stress hormones being better; Xe is the best alternative to nitrous oxide.

[Hemodynamics and function of the myocardium during xenon anesthesia].

Hemodynamics and phase structure of the cardiac cycle have been studied, using a technical complex "KO phi OOC", on 12 anesthesiologists volunteers during various stages of Xe anesthesia (70:30). During 30 min anesthesia Xe formed conditions for normalization of hemodynamic changes caused by emotional stress, had no depressive effect on the myocardium, failed to affect considerably vascular tone and myocardial phase structure. Due to its narcotic effect Xe changed variability of the cardiac rhythm.

[Clinical stages and subjective sensations in xenon anesthesia].

Clinical pattern of monoanesthesia with Xe:O2 (70:30) has been studied in 12 anesthesiologists volunteers in comparison with their subjective sensations. Four clinical stages of anesthesia have been identified: paresthesia and hypoalgesia, euphoria and psychomotor activity, analgesia and partial amnesia, anesthesia (analgesia and amnesia). Induction anesthesia took 5 to 6 min, anesthesia discontinuation was easy and prompt without any adverse events.