Esophageal electrocardiography: a new technology revives an old technique.

This study evaluates the clinical use of an easily swallowed bipolar electrode for recording an esophageal electrocardiogram (ECG). Fourteen patients were selected for bedside diagnosis (ECG group) because of arrhythmias difficult to evaluate using a standard 12-lead ECG. A second group of 27 non-selected patients scheduled for routine 24-hour ambulatory electrocardiographic recordings (ambulatory ECG group) had an esophageal ECG recorded as the "third channel." All 14 patients (100%) in the ECG group had excellent-quality tracings, and the esophageal ECG was diagnostic in 12 cases (86%). Of 27 patients in the ambulatory ECG group, 19 (70%) had fairly good to excellent-quality 24-hour esophageal pill tracings, with the esophageal ECG contributing to correct arrhythmia diagnosis in 11 patients (41%). It is concluded that this easily swallowed esophageal electrode provides an excellent-quality short-term ECG and often permits proper arrhythmia diagnosis in selected patients with arrhythmias. Good-quality 24-hour esophageal ambulatory electrocardiographic recordings can also be obtained that contribute to arrhythmia diagnosis in a limited number of unselected patients, and should be even more clinically useful in carefully selected patients.