[Supplemental device for the electrocardiograph 6 NEK 4 for the recording of esophageal electrocardiograms].

For the analysis of the cardiac rhythm an additional device for recording electrocardiograms of the oesophagus which can be connected with the 6-canal-electrocardiograph 6 NEK 4 was developed. The device works as an ECG-preamplifier with a high reverse of amplification. Using a special filter it is possible to get well evaluable records excluding each zero line drift, even on most difficult conditions. The possibility of connection with any experimental entry of the 6 NEK 4 renders possible the combination of the electrocardiogram of the oesophagus with any ECG standard deviation program.