Oesophageal electrocardiography in healthy horses |
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Authors: | Verheyen T Decloedt A De Clercq D Sys S Van Loon G |
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Affiliation: | Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium. |
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Abstract: | Reasons for performing study: In human medicine, oesophageal electrocardiography (ECG) is a well‐established technique that magnifies P waves with respect to the QRS complex. Objectives: To investigate the feasibility of oesophageal ECG recording in horses and its ability to produce larger P waves compared with base‐apex and unipolar recordings. Methods: Bipolar and unipolar ECG were performed using oesophageal and surface electrodes. Oesophageal ECG was obtained from 6 different recording configurations at different oesophageal depths. Amplitudes of P, Q, R, S and T waves were measured from 3 different cardiac cycles for each recording configuration and depth. Results: Oesophageal ECG was feasible in all horses. For all oesophageal recording configurations, significantly larger P waves were recorded from a depth that equalled ‘height of the withers + 10 cm’ (HW+10) than from any other depth. P/QRSmagn, the ratio between the P wave and QRS complex magnitudes, was largest for intraoesophageal recordings with an interelectrode distance of 10 cm, at HW+10, where it was significantly larger than base‐apex and unipolar recordings. Base‐apex recording resulted in significantly smaller P waves than all other recording configurations and significantly smaller P/QRSmagn ratios than all other recording configurations except one combined oesophageal‐surface recording (E/Slow). Conclusions: Oesophageal ECG recording is feasible in horses and effective in magnifying P wave amplitude. Potential relevance: The procedure is promising for diagnosis of supraventricular tachydysrhythmias and might be used in electrophysiological studies and for cardiac pacing. |
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Keywords: | horse cardiology electrodes unipolar |
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