Normal ECG and cardiac ultrasound can usually rule out structural heart disease and myocardial infarction. Heart diseases such as arrhythmias and coronary artery disease cannot be ruled out yet, and further management is recommended according to the doctor’s opinion.
A normal electrocardiogram usually means that no arrhythmia (e.g. premature beats, tachycardia, etc.) or myocardial ischemia was detected during that examination. However, arrhythmias are generally paroxysmal and need to be captured at the onset. In contrast, the coronary arteries of the heart are highly compensatory, and ischemic changes are often not detected by ECG in the absence of an attack, and generally require an exercise stress test, etc., to be captured.
A normal cardiac ultrasound generally suggests that the heart is structurally normal at the time of the examination, with no valvular or cardiac size lesions, etc. However, arrhythmias and myocardial ischemia may not always be detected on this examination.
Therefore, if there is any cardiac discomfort, it is recommended to seek medical attention as soon as possible for further examination under the advice of a doctor.