Final answer:
An electrocardiogram (ECG) is a diagnostic tool used to measure the electrical activity of the heart. It detects various heart conditions and abnormalities. ECG technology has advanced to the point where portable monitors can be used in emergency vehicles or incorporated into wearable devices.
Step-by-step explanation:
An electrocardiogram (ECG) is a diagnostic tool used to measure the electrical activity of the heart. It is commonly used in cardiology to detect various heart conditions and abnormalities. The ECG records the voltages created by the wave of depolarization and subsequent repolarization in the heart.
Regions of damaged heart tissue, called infarcts, can be detected in an ECG. Changes due to gradual damage to the heart can be compared by comparing a recent ECG to an older one. The ECG technology has advanced to the point where portable monitors can be used in emergency vehicles or incorporated into wearable devices.