Electrocardiogram
Electrocardiogram (ECG) detects the electrical activity of the heart. It is an essential test, which allows cardiac physiologist or a doctor to check the rhythm of the heart beat and monitor the conditions carefully. Heart problems such as arrhythmias can be detected using the ECG.
References: Electrocardiogram (ECG) ." Electrocardiogram (ECG). Web. 22 Oct. 2015