An ECG is a representation of the electrical activity of the heart on a paper. Different waves mean different things. Normal ECG waves are same for different people. However, any changes in the heart activity shows up on the ECG and can be detected by the health care provider.
For instance, when an MI occurs, the patient’s ECG shows an elevated ST segment as well as an inverted T wave on the 12-lead ECG. This helps health care providers to detect the presence of a harmful cardiac event. They can immediately administer treatment and minimize the damage. These changes on the ECG tend to stay for a while after the attack, so that doctors can detect the presence of any recent MI.
T-wave inversion, ST-segment elevation, and a pathologic Q-wave are all signs of tissue hypoxia which occur during an mi.
Ischemia results from inadequate blood supply to the myocardial tissue and is reflected by t-wave inversion. Injury results from prolonged ischemia and is reflected by st-segment elevation. Q-waves may become evident when the injury progresses to infarction. a notched t-wave may indicate pericarditis in an adult client. The presence of a u-wave may or may not be apparent on a normal ecg; it represents repolarization of the purkinje fibers. Aprolonged pr-interval is associated with first-degree atrioventricular block.