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Method and apparatus for the measurement of thoracic field potentiometry

  • US 4,953,556 A
  • Filed: 02/29/1988
  • Issued: 09/04/1990
  • Est. Priority Date: 12/13/1984
  • Status: Expired due to Fees
First Claim
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1. A method of measuring cardiac activity, which method comprisesgenerating an oscillating electrical signal,applying the oscillating electrical signal to the the thorax of a patient,providing in the oesophagus of the patient an oesophageal probe including a first electrode,providing a second electrode on the left side of the chest of the patient in a position such that measurement of voltage between the said first and second electrodes provides a measure of cardiac volume, andmeasuring the voltage induced between the first and second electrodes and producing therefrom an output signal indicative of cardiac activity in the patient.

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