Quantification of electrical activity in the human diaphragm

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Abstract
The quantification of the electrical activity of the diaphragm in man, obtained with an esophageal electrode, is impaired by the unavoidable presence of a large and variable electrocardio-graphic signal. This paper describes a method whereby this signal is reduced and kept constant, permitting a simple subtraction from the activity recorded with the esophageal electrode. With this purpose a clipping circuit was designed and is described, A sample of electrical activity is recorded with a bipolar electrode introduced via the esophagus to the level of the diaphragm. The electrical signal is then amplified, rectified, clipped, and integrated; a measure of electrical activity in the diaphragm can then be obtained.

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