Chapter 144 Electrocardiography

Electrocardiography is the graphic representation of the electrical activity of the heart with time displayed on the x-axis and voltage displayed on the y-axis. Electrocardiograms (ECGs) are easy to perform and readily available to practicing veterinarians. There are numerous indications for performing ECGs, and the examination provides information that is useful and often pivotal to the diagnosis and management of cardiac and systemic disturbances. Veterinarians or their technicians can perform and interpret their own ECGs or utilize readily available fax, transtelephonic, or computer consultation services.


Indications for Performing Electrocardiography

Electrocardiography is the examination of choice for diagnosis of a normal cardiac rhythm and arrhythmias and for monitoring the effect of antiarrhythmic therapy. There are a number of clinical indications for recording and interpreting an ECG:

Technique for Recording an Electrocardiogram


Chest Lead Placement of the V Lead
CV5RL (rV2) Fifth intercostal space on the right side near the sternum
CV6LL (V2) Sixth intercostal space on the left side near the sternum
CV6LU (V4) Sixth intercostal space on the left side at the costochondral junction
V10 Over the dorsal spine of the seventh thoracic vertebra

How to Evaluate the Electrocardiogram


Electrocardiographic abnormalities can be divided into those involving heart rate and rhythm and those involving the configuration of the complexes. This chapter discusses abnormalities involving the ECG complexes. Arrhythmias are discussed in more detail in Chapter 145.

Intraventricular Conduction Disturbances

Right Bundle Branch Block (Fig. 144-4)

Aug 27, 2016 | Posted by in SMALL ANIMAL | Comments Off on Electrocardiography

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