A patient care technician is obtaining an EKG from a patient who reports chest pain. Which of the following changes in a waveform should the technician recognize as an Indication of a myocardial infarction and report to the nurse immediately? Upright Twaves Q waves less than one-third the height of the R wave Pwave inversion ST segment elevation

## Step 1<br />An Electrocardiogram (EKG or ECG) is a test that measures the electrical activity of the heart. It is used to detect various heart conditions, including myocardial infarction (heart attack). The EKG waveform consists of several components, including the P wave, QRS complex, and T wave. Each component represents a different part of the heart's electrical activity.<br /><br />## Step 2<br />The options provided in the question are:<br />- Upright T waves<br />- Q waves less than one-third the height of the R wave<br />- P wave inversion<br />- ST segment elevation<br /><br />## Step 3<br />Among these options, the presence of ST segment elevation is a significant indicator of a myocardial infarction. The ST segment represents the period when the ventricles are depolarized. An elevation in this segment indicates that there is an injury to the heart muscle, which is a hallmark of a myocardial infarction.<br /><br />## Step 4<br />The other options, such as upright T waves, Q waves less than one-third the height of the R wave, and P wave inversion, can indicate other cardiac conditions but are not as definitive for a myocardial infarction as ST segment elevation.