Diagnostic Tests for Pets with Heart Disease: Holter Monitor

A Holter monitor is a portable form of electrocardiography (ECG) and this device records the electrical activity of the heart over 24–48 hours. An event recorder continuously records a portion of the ECG, and after a button is pressed this section is stored until future analysis. These techniques are very useful in an animal that is having fainting episodes (syncope) by recording heart rhythm in relationship to fainting to determine whether abnormal heart rhythms (arrhythmia) are the likely cause of the problem. In many patients, the arrhythmia occurs at irregular intervals and the Holter monitor or event recorder may be utilized to assess the frequency and severity of an arrhythmia throughout the day.