What does "sinus rhythm with ST segment changes" mean?

Sinus rhythm refers to a normal heart rhythm originating from the sinoatrial node. The ST segment is a horizontal line on the electrocardiogram (ECG) that represents the myocardial repolarization phase following contraction. Changes in the ST segment typically indicate pathological conditions such as myocardial ischemia, myocardial injury, or electrolyte imbalances. Specific details are as follows:

When an ECG shows changes in the ST segment under sinus rhythm, it may suggest underlying conditions such as myocardial ischemia or injury. Specifically, ST segment elevation may result from myocardial ischemia or damage caused by conditions like myocardial infarction or coronary artery disease. Conversely, ST segment depression may be due to pathological states such as myocardial ischemia, pericarditis, or myocarditis.

It should be noted that ST segment changes under sinus rhythm alone cannot definitively diagnose any specific disease; clinical evaluation must incorporate the patient's symptoms, medical history, and physical findings for comprehensive analysis. If ST segment abnormalities are observed, it is advisable to consult a physician promptly and undergo further examinations and treatment.