Method and apparatus for the measurement of thoracic field potentiometry
First Claim
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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Abstract
Apparatus for measuring cardiac and/or pulmonary activity, comprising an electrical oscillator, a pair of electrodes for applying the oscillating electrical signal to the thorax of a patient, an oesophageal probe including an oesophageal electrode, a sensing electrode adapted to be positioned on the chest of the patient in the region of the apex of the heart, whereby measurement of voltage between the said first and second electrodes provides a measure of cardiac volumes, a third electrode adapted to be positioned on the chest of the patient at a position on the right side of the chest generally corresponding with that of the second electrode of the left side of the chest, whereby measurement of voltage between the said first and third electrodes provides a measure of volume of the right lung of the patient, a device for measuring the voltage induced between the first and second, and the first and third electrodes respectively, and for thereby providing first and second output signals respectively, indicative of cardiac and pulmonary activity respectively.
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Citations
17 Claims
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1. A method of measuring cardiac activity, which method comprises
generating 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, and measuring 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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10. Apparatus for measuring cardiac and/or pulmonary activity, which apparatus comprises
means for generating an oscillating electrical signal, means for applying the oscillating electrical signal to the thorax of a patient, an oesophageal probe including a first electrode, a second electrode adapted to be positioned on the left side of the chest of the patient over the heart, whereby measurement of voltage between the said first and second electrodes provides a measure of cardiac volumes, a third electrode adapted to be positioned on the chest of the patient at a position on the right side of the chest generally corresponding with that of the second electrode of the left side of the chest, whereby measurement of voltage between the said first and third electrodes provides a measure of volume of the right lung of the patient, means for measuring the voltage induced between the first and second, and the first and third electrodes respectively, and for thereby providing first and second output signals respectively, indicative of cardiac and pulmonary activity respectively.
Specification