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MYOCARDIAL INFARCTION
A myocardial infarction, also and commonly called a heart attack, happens when a blood vessel in the heart suddenly becomes blocked.
Blood vessels carry blood and oxygen. When a blood vessel in the heart gets blocked, blood cannot get to part of the heart. This part of the heart does not get enough oxygen. This is called ischemia. When the heart muscle becomes ischemic , the ischemia often causes chest pain. This is called Angina Pectoris. If the ischemia lasts long enough, the heart muscle that is not getting enough oxygen dies. This is called an infarction. "Myocardial infarction" means "infarction in the heart muscle." A heart attack is a medical emergency. The first few minutes are very important for keeping the person alive. Some of the damage from the heart attack can be repaired if the person gets treatment within the first hour of the attack.

In the UK, cardiovascular diseases, including myocardial infarction, are a leading cause of morbidity and mortality. According to the British Heart Foundation, around 100,000 people experience a heart attack each year. Despite advancements in medical treatment and emergency care, the incidence of MI remains high, particularly among older adults and individuals with pre-existing health conditions.

Myocardial infarction primarily results from coronary artery disease (CAD), where the arteries supplying blood to the heart become narrowed or blocked due to atherosclerosis—a buildup of fatty deposits. Several risk factors contribute to the development of CAD and subsequent myocardial infarction, including:

  • Lifestyle Factors: Poor diet, physical inactivity, smoking, and excessive alcohol consumption significantly increase the risk of heart disease.
  • Comorbid Conditions: High blood pressure, diabetes, and high cholesterol levels are major risk factors for MI.
  • Genetics: A family history of heart disease can elevate an individual's risk.

Recognizing the symptoms of a myocardial infarction is critical for timely intervention. Common signs include:

  • Chest pain or discomfort (often described as a feeling of pressure, squeezing, or fullness)
  • Radiating pain in the arms, back, neck, jaw, or stomach
  • Shortness of breath
  • Sweating, nausea, or lightheadedness

In women, symptoms can sometimes differ, presenting more frequently as fatigue, anxiety, and abdominal discomfort rather than classic chest pain.