Named after its inventor, Norman Holter, this is a piece of equipment which allows a continuous recording to be made of the electrical activity of the heart, for 24 hours as a minimum. It is used if the veterinarian observes an anomaly in the cardiac rhythm or in order to evaluate the effectiveness of a treatment that is already in place.
The apparatus consists of several electrodes affixed to the animal’s chest and linked to a box. Once the animal has returned to the clinic, the veterinarian will remove the equipment and will analyse the problems with the cardiac rhythm. Tachycardia if the beats are too rapid, bradycardia if they are too slow...
This examination, which is totally painless for the animal, has the advantage of the animal not needing to remain hospitalised during recording.