Acute Coronary Syndrome (ACS): Types, Symptoms & Emergency Warning Signs
Acute coronary syndrome (ACS)
What is Acute Coronary Syndrome?
Acute coronary syndrome (ACS) is an umbrella term used to describe conditions where blood flow to the heart muscle is suddenly reduced due to a blockage in one of the coronary arteries. This reduced blood flow means the heart does not receive enough oxygen, which can lead to serious and sometimes irreversible damage.
ACS includes unstable angina, NSTEMI, and STEMI. These conditions are medical emergencies and require immediate treatment to restore blood flow, prevent heart muscle damage, and reduce the risk of sudden cardiac death. If symptoms appear, emergency medical help should be sought immediately.
Types of Acute Coronary Syndrome
ACS is classified into three main types.
Unstable angina is chest discomfort that is new, more severe, or occurs more frequently than usual. Unlike stable angina, it can occur unexpectedly and indicates reduced blood flow to the heart, but there is no permanent heart damage yet. However, it can quickly progress to a heart attack.
NSTEMI, or non-ST-segment elevation myocardial infarction, is a type of heart attack caused by a partial blockage in a coronary artery. This condition can damage the heart muscle if not treated promptly.
STEMI, or ST-segment elevation myocardial infarction, is the most severe form of heart attack. It occurs due to a complete blockage of a coronary artery, leading to significant heart muscle damage or death if emergency treatment is not given immediately.
Core Warning Signs of ACS
The most common sign of ACS is chest discomfort, which may feel like pressure, squeezing, heaviness, or fullness in the center of the chest. This pain may last for several minutes or come and go.
Pain or discomfort may also spread to other areas such as the jaw, neck, back, stomach, or one or both arms and shoulders. Many people also experience sudden shortness of breath, which may occur with or without chest pain.
Other warning signs include dizziness, lightheadedness, or fainting. Some individuals may experience cold sweating, nausea, or vomiting without an obvious cause.
Important Variations in Symptoms
Symptoms of ACS can vary depending on age, sex, and underlying health conditions.
In women, chest pain is still common, but symptoms may also include unusual fatigue, neck or upper back pain, stomach discomfort that feels like indigestion, or a strong sense of anxiety.
In older adults and people with diabetes, chest pain may be absent. Instead, symptoms may present as unexplained shortness of breath, sudden weakness, low blood pressure, or vague abdominal discomfort.