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Left Main Coronary Artery Disease is a dangerous cardiovascular ailment that occurs when there is narrowing or blockage in the left main coronary artery, the artery that delivers blood to a large part of the heart muscle. This artery supplies blood to both the left anterior descending artery and the left circumflex artery; therefore, any blockage can dramatically lower the oxygen supply to the heart and increase the likelihood of a heart attack, heart failure, or sudden cardiac death.
The leading causes are atherosclerosis, high cholesterol, hypertension, diabetes, smoking, obesity and a sedentary lifestyle. The patient may have symptoms such as chest pain, shortness of breath, exhaustion, dizziness, palpitations, or pain that radiates to the arm, neck, or jaw. Occasionally a big cardiac episode is the first sign of a serious obstruction.

A diagnosis is usually made by means of electrocardiography (ECG), stress testing, echocardiography, coronary angiography, CT coronary angiography, or intravascular ultrasonography. The treatment depends on the severity of the blockage and may involve medications, including blood thinners, statins, and beta-blockers, and lifestyle changes. More serious cases may require coronary artery bypass grafting (CABG) or angioplasty with stent implantation to restore blood flow to the heart and to prevent complications. Timely diagnosis and treatment are critical in enhancing survival and maintaining long-term cardiac function.