Which of the following is also known as an ECG or EKG?

An electrocardiogram refers specifically to the process and the resulting record of the electrical activity of the heart over a period of time. This test is crucial for diagnosing various heart conditions, as it shows the heart's rhythm, rate, and size of the chambers, as well as evidence of previous heart attacks. The abbreviation ECG is derived from the term in both English and German (Elektrokardiogramm), while EKG is commonly used in German-speaking regions. This term is essential for veterinary medicine as it applies to assessing the cardiac health of animals.

The other options refer to different tests that measure electrical activity in other parts of the body: an electroencephalogram records brain activity, an electromyogram measures muscle activity, and an echocardiogram uses ultrasound to visualize the heart's structure and function. Each of these tests serves distinct purposes and involves different organs and systems, helping to narrow down the specific diagnosis being investigated.