Neuroanesthetic adjuncts for surgery in the sitting position. IV. The isolation amplifier.
D000669:Amplifiers, Electronic; D006328:Cardiac Catheterization / Q000295:instrumentation*; D004556:Electric Injuries / Q000517:prevention & control*; D004562:Electrocardiography / Q000295:instrumentation*; D005071:Evoked Potentials; D006325:Heart Atria; D009493:Neurosurgery; D011187:Posture