An electrocardiogram (ECG) is a diagnostic test that records the electrical activity of the heart. The electrocardiogram is a noninvasive test. The ECG is the test of choice for diagnosis of abnormal heart rhythms and also can be useful for identification of heart enlargement or drug effects on the heart. An ECG is often recorded during anesthesia. An ECG is indicated whenever a heart rhythm problem is suspected. Often an ECG will be recorded when a heart murmur is detected, when there is x-ray evidence of heart enlargement, or when cardiovascular symptoms such as fainting occur. There is no real contraindication to performing this test; however, it should be appreciated that a normal ECG does not exclude the possibility of heart disease. As with all tests, the ECG is not 100 percent accurate. If you are concerned that your pet may be having heart trouble please contact us to set up an appointment for an ECG.