narcosis, state of stupor induced by drugs. The use of narcotics as a therapeutic aid in psychiatry is believed to have a history dating back to the use of opium for mental disorders by the early Egyptians. Prolonged narcosis was employed at the beginning of the 20th cent.; its chief value was the reduction of excitement and tension in the psychotic patient. J. S. Horsley introduced (1936) the term narcoanalysis for the use of narcotics to induce a trancelike state in which the patient talks freely and intensive psychotherapy may be applied. It was used with considerable success in treatment of acute combat psychoneuroses during World War II.
or nitrogen euphoria or raptures of the deep

Effects of breathing nitrogen under increased pressure. In divers breathing compressed air, nitrogen saturates the nervous system, causing an intoxicating light-headed, numb feeling, then slowed reasoning and dexterity, and then emotional instability and irrationality. Severe cases progress to convulsions and blackout. Susceptibility varies, and severity increases with depth, but there are no aftereffects. Physical function remains normal, and divers may be unaware of the growing irrationality that can cause them to rise too fast (see decompression sickness) or let their air supply run out. Helium, which dissolves less easily in body tissues, is substituted for nitrogen for deep dives.

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