What does an abnormal Q wave in lead III of a sinus rhythm mean?

Sinus rhythm with abnormal Q waves in lead III means that an abnormal Q wave can be observed in lead III. The detailed analysis is as follows:

Sinus rhythm with abnormal Q waves in lead III mainly refers to a waveform pattern observed during a 12-lead electrocardiogram (ECG) examination. This finding may commonly occur in individuals who are overweight or obese. Typically, when cardiac ultrasound or biochemical tests are performed, no significant abnormalities are found. In such cases, no special treatment is required—close observation is sufficient.

However, abnormal Q waves in lead III may also indicate underlying heart disease or renal failure. During ECG examination, these abnormal Q waves may arise due to myocardial injury or necrosis, or damage to pulmonary tissue. If this phenomenon is detected, patients are advised to seek further evaluation at a hospital through tests such as coronary angiography, coronary CTA, or pulmonary artery CTA, to determine the exact cause and receive targeted treatment. Sinus rhythm with abnormal Q waves in lead III should be taken seriously, as failure to treat promptly may lead to worsening of the condition and endanger the patient's health.