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Biomedical subjects

B A Lampert

Publications and source records attributed to B A Lampert.

5 recordsLinked to original sources
PubMed1984

Computer-controlled anesthetic delivery system.

We designed and tested a computer-controlled syringe pump for the administration of volatile anesthetics into a closed breathing circuit. The system consists of a small computer, a flip-flop circuit, and an automatic syringe pump. The computer was programmed to administer liquid anesthetics according to the square root of time model of anesthetic uptake. A simple electronic flip-flop circuit connected the computer to the syringe pump. Safeguards to prevent accidental anesthetic overdosage and algorithms to provide for dosage changes based on patient response were written into the program. After testing, the system was used to administer anesthetics to ten patients undergoing surgical procedures. The anesthetic uptake deviated from the square root of time model after approximately two hours. The system provided smooth and reliable administration of volatile anesthetics during closed circuit anesthesia.

Adult↗
PubMed1982

Effect of nitrous oxide solubility on vaporizer aberrance.

Concentrations of halogenated anesthetics produced by contemporary vaporizers vary from vaporizer dial settings when carrier gas is not 100% oxygen. This effect is most marked when carrier gas changes from 100% O2 to 100% nitrous oxide (N2O). Vapor concentrations of halothane and enflurane from vaporizers with 6 L/min carrier gas flows were reduced to 3% from 4% until absorption of N20 by the liquid anesthetic ceased. Presaturation of liquid anesthetics with N2O eliminated the transient decrease of vapor output. Steady-state outputs of halothane and enflurane in 100% N2O were 10% below dial settings. The significance of these changes in administration of closed-circuit anesthesia with an out-of-circuit vaporizer is discussed.

Anesthesiology↗