No, an Electrocardiogram (ECG) does not always show an abnormal heart rhythm (arrhythmia). An ECG is a test that records the electrical activity of the heart, including the rate and regularity of heartbeats. It is a helpful diagnostic tool for assessing the heart's health, but it does not always reveal an arrhythmia.
An arrhythmia is an abnormality in the heart's rhythm, such as a faster or slower than normal heartbeat. An ECG can detect some types of arrhythmias, such as atrial fibrillation, and it can provide valuable information to a physician about a person's heart health. However, some arrhythmias may not be detectable on an ECG, such as sinus arrhythmia or sinus bradycardia. In these cases, an ECG may not reveal an arrhythmia, but other tests may be needed to diagnose the condition.
An ECG can also detect abnormalities that may indicate a risk of arrhythmia, such as an enlarged heart or an abnormal heart rate. These findings can be used to help identify people who may be at risk for developing an arrhythmia and who may need further testing.
In conclusion, an ECG does not always show an abnormal heart rhythm (arrhythmia). It can provide useful information about a person's heart health, but it may not detect all types of arrhythmias or abnormalities that suggest a risk of arrhythmia. If an ECG does not reveal an arrhythmia, further testing may be needed to diagnose the condition.