Under what circumstances is a coronary angiography required?

Cardiac angiography is usually required in cases such as unexplained arrhythmia, unexplained left ventricular dysfunction, or prior to congenital heart disease surgery. The specific situations are as follows:

1. Unexplained Arrhythmia

Cardiac angiography includes ventriculography and coronary angiography. Some patients' arrhythmias are mostly caused by myocardial ischemia leading to conduction block or abnormal conduction, resulting in the aforementioned conditions. Common examples include myocardial infarction and angina pectoris. In such cases, especially among middle-aged and elderly patients with underlying coronary artery disease, cardiac angiography should be performed under a doctor's guidance to clarify the specific condition of the heart.

2. Unexplained Left Ventricular Dysfunction

When patients present with the above symptoms, the main causes are often dilated cardiomyopathy or ischemic heart disease. To differentiate between these two conditions, physicians need to perform tests such as cardiac angiography.

3. Prior to Surgery for Congenital Heart Disease

Before undergoing such surgeries, particularly in patients around 50–70 years of age, comorbidities such as hyperlipidemia and hypertension are common. Therefore, cardiac angiography should be performed before surgery.

In addition to the above, this test may also be conducted when patients experience unexplained chest pain. Patients are advised to visit正规 hospitals and undergo appropriate examinations according to their specific conditions under medical supervision, avoiding unnecessary or blind testing that could delay proper diagnosis and treatment.