image of Electrocardiography
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An electrocardiogram is a recording of the electrical activity of the heart, providing definitive information about heart rate and rhythm. ECG recording is indicated when investigating cardiac arrhythmia, heart disease or collapse. This chapter considers electrocardiography machines and how to choose the optimal machine for your practice.

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11.1 Standard leads for electrocardiography. (right ‘arm’) – attach to right elbow; (left ‘arm’) – attach to left elbow; (left leg) – attach to left stifle; (right leg, earth lead) – attach to right stifle. Patient positioning and restraint for a resting ECG. (b, Courtesy of Simon Dennis. Reproduced from ).
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11.2 Lead II trace for interpretation.
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11.3 Electrodes. Crocodile clips, with filed teeth to improve comfort. Atraumatic clips. Button clip for use with adhesive electrodes. Adhesive electrodes. Clip attached by an adhesive pad to prevent skin trauma. (e, Courtesy of Ruth Willis. Reproduced from ).
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11.4 The ECG is recorded and transcribed on to the paper in real time.
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11.5 ECG trolley ready for use.
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11.6 ECG recording and display via a telemetric system.
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11.7 Fitting a digital Holter monitor to a dog for ambulatory ECG recording. Adhesive electrodes positioned over left heart apex and base. Programming the Holter monitor. Holter in protective case. Holter bandaged in position.
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