• Biomed Instrum Technol · Sep 1989

    Comparative Study

    Lower esophageal contractility: a technique for measuring depth of anesthesia.

    • D R Kuni and G Silvay.
    • American Antec Inc., Valencia, California 91355.
    • Biomed Instrum Technol. 1989 Sep 1; 23 (5): 388-95.

    AbstractUntil recently, there has been no simple, accurate, reliable technique for monitoring depth of anesthesia during surgery. A system that measures lower esophageal contractility (LEC) has been designed for this purpose. The system consists of a monitor and a disposable esophageal probe equipped with provoking and measuring balloons. Since the motor control of the esophagus is directly controlled by the brain stem, LEC was postulated to be a reflection of the anesthetic state of the patient. Multiple-center clinical studies have shown that LEC correlates significantly (p less than 0.005) with concentrations of volatile anesthetic agents and patient responses to surgical stimulation. Closed-loop anesthetic techniques have been developed at several institutions based on LEC and hemodynamic parameters. Lower esophageal contractility has been shown to be an accurate monitor of anesthetic depth for a variety of surgical procedures and anesthetic techniques.

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