Bagger H. Ugeskr Laeger 1991 Nov 18;153(47):3321-2 Recording of the esophageal ECG is important in differentiating between different types of tachycardia. A method is described by which the (CardioCommand) pill electrode can be re-used. The electrode is introduced through the nose and connected to a telemetric monitor. In this way the esophageal ECG can be monitored continuously in order to characterize transient, self-limiting tachycardias. Monitoring has been performed for up to four days without problems.