1. The effects of procaine and pentothal sodium on tracheal smooth muscle in 12 healthy adult rabbits were investigated in vitro by means of field electrical stimulation.

2. The mechanism of the variation of the blood pressure in lowering the vertebral arterial pressure was analyzed and investigated in dogs anaesthetized by sodium pentothal.

3. Methods Procaine intravenous anesthesia was administered after ketamine basal anesthesia, pentothal sodium induction and intubation.

4. Objective Cerebral perfusion pressure(CPP)of brain tumor patients during induction and tracheal intubation after intravenous sodium pentothal succinylcholine or etomidate atracurium was compared.

5. U.S. officials later asked Collins to undergo hypnosis and treatments of sodium pentothal (a "truth drug") to be sure he relayed every detail of the incident truthfully and correctly.