Decreased cardiac output leads to myocardial hypoxia and weakened heart function, which is the number one risk to human health. Decreased cardiac output is mostly caused by hyperlipidemia and hypercholesterolemia, which can be deposited in the inner walls of arteries until atheroma is formed, causing narrowing and even blockage of blood vessels, which can eventually lead to coronary heart disease and other serious diseases. So how can we detect reduced cardiac output early? In order to detect reduced cardiac output as early as possible, people over 40 years old should undergo regular medical checkups to find out whether there are risk factors related to coronary heart disease, such as blood lipids, blood pressure, blood sugar, neck vascular ultrasound, heart ultrasound, electrocardiogram and other examinations. If you belong to the high-risk group for myocardial ischemia, you should ask your doctor whether you have typical symptoms of coronary artery disease and decide whether you need to undergo loading tests, such as active plate ECG, adenosine loading cardiac echocardiography and coronary multi-row CT. The evaluation of non-invasive tests is used to decide whether you need to further confirm the diagnosis using coronary angiography, the gold standard for coronary artery disease diagnosis, to clarify the degree and extent of coronary artery lesions. Patients with typical symptoms of coronary artery disease, as judged by a cardiologist with extensive clinical experience, may be considered for direct coronary angiography and, if necessary, stent implantation, without the need for prior multi-row CT of the coronary arteries.