Heart attacks of all types with Dr. Hind Al-Sousi

Dr. Hend El-Sousy explains that a heart attack, or myocardial infarction, occurs when blood flow carrying oxygen to part of the heart muscle is reduced or completely blocked, usually because a blood clot forms over a buildup of plaque inside a coronary artery, and the longer the artery remains blocked, the greater the risk of permanent heart muscle damage, making rapid diagnosis and treatment essential.

Types of Heart Attacks

The different types of myocardial infarction show that heart attacks are not a single condition, but rather include several types of myocardial infarction that differ in their underlying mechanisms and causes, including Type 1, Type 2, Type 3, Type 4, and Type 5 myocardial infarction, as well as conditions such as MINOCA, in which myocardial infarction occurs without an obvious major blockage in the coronary arteries.

Type 1 Myocardial Infarction

Dr. Hend El-Sousy explains that Type 1 myocardial infarction is usually associated with the rupture or erosion of cholesterol-containing plaque inside a coronary artery, which activates the clotting process and leads to the formation of a blood clot that may partially or completely block the artery and reduce blood and oxygen supply to part of the heart muscle.

Type 2 Myocardial Infarction

Type 2 myocardial infarction occurs because of an imbalance between the heart muscle’s oxygen requirements and the amount of oxygen supplied to it, rather than primarily because of a blood clot caused by plaque rupture, and it may be associated with medical conditions or circumstances that increase the heart’s oxygen demand or decrease its blood supply.

Type 3 Myocardial Infarction

Type 3 myocardial infarction refers to cases involving sudden cardiac death with symptoms suggesting myocardial ischemia, characteristic electrical changes, or a serious heart rhythm disturbance before cardiac troponin testing can be obtained or myocardial infarction can otherwise be confirmed.

Type 4 Myocardial Infarction and Coronary Intervention

Type 4 myocardial infarction is associated with percutaneous coronary intervention (PCI) and includes specific situations related to complications of the procedure, stent thrombosis, or restenosis within a previously treated coronary artery, with each situation requiring appropriate medical evaluation according to its timing and underlying cause.

Type 5 Myocardial Infarction and Bypass Surgery

Type 5 myocardial infarction refers to myocardial infarction occurring around the time of coronary artery bypass grafting (CABG), potentially due to complications associated with the surgical procedure, and diagnosis depends on specific clinical, laboratory, ECG, and imaging criteria.

STEMI: ST-Elevation Myocardial Infarction

Dr. Hend El-Sousy explains that STEMI is an acute myocardial infarction characterized by specific ST-segment elevation on an ECG, often associated with complete blockage of a coronary artery and severe interruption of blood flow to a significant portion of the heart muscle, making urgent evaluation and treatment essential to restore blood flow.

NSTEMI: Non-ST-Elevation Myocardial Infarction

NSTEMI is a type of acute myocardial infarction in which the characteristic ST-segment elevation seen in STEMI is not present on the ECG, and the condition may result from partial coronary artery blockage or another mechanism causing reduced blood flow to the heart, with diagnosis based on symptoms, ECG findings, cardiac troponin levels, and other appropriate investigations.

The Difference Between STEMI and NSTEMI

The difference between STEMI and NSTEMI is mainly related to the ECG pattern, mechanism and degree of coronary artery obstruction, and extent of heart muscle involvement, with diagnosis based on the combination of clinical symptoms, ECG findings, cardiac troponin levels, and other diagnostic investigations.

Symptoms of a Heart Attack

Heart attack symptoms may include chest pain, pressure, or discomfort, shortness of breath, sweating, nausea, vomiting, dizziness, or pain spreading to the arm, shoulder, jaw, back, or neck, while symptoms may vary between patients and some women may experience less typical symptoms such as unusual fatigue, upper-back discomfort, or stomach-related symptoms.

Causes of Heart Attacks

The causes of heart attacks include coronary atherosclerosis and the buildup of cholesterol and fatty deposits inside the coronary arteries, where plaque can rupture or erode and trigger blood clot formation that obstructs blood flow, while less common causes include coronary artery spasm, coronary embolism, or coronary artery dissection.

The Importance of an ECG in Diagnosing a Heart Attack

The ECG is one of the most important initial tests for suspected acute coronary syndrome and myocardial infarction, as it can identify electrical changes associated with certain types of myocardial infarction, particularly STEMI, while the ECG must be interpreted together with symptoms, cardiac biomarkers, and other clinical findings.

The Importance of Cardiac Troponin Testing

Dr. Hend El-Sousy explains that cardiac troponin testing is an important component of diagnosing myocardial infarction, as troponin levels are interpreted in the context of the patient’s symptoms, ECG changes, clinical examination, and other diagnostic findings, and an appropriate rise or fall in cardiac troponin can support the diagnosis of acute myocardial injury when combined with evidence of myocardial ischemia.

The Role of Cardiac Catheterization in Treating Heart Attacks

Heart attack treatment focuses on restoring blood flow to the heart muscle as quickly as possible, and treatment may include medications and interventional procedures such as coronary angiography and PCI to open the blocked artery and place a stent when necessary, with the treatment approach determined by the type of heart attack and the patient’s overall condition.

The Importance of Rapid Treatment

Rapid management of a heart attack is essential because prolonged blockage of a coronary artery can lead to increasing heart muscle damage, making immediate medical evaluation and timely treatment important for reducing the extent of damage and improving the chances of recovery.

Does Every Chest Pain Mean a Heart Attack?

Dr. Hend El-Sousy explains that chest pain does not necessarily mean a heart attack, because chest discomfort can have many different causes, but the nature of the pain alone cannot reliably rule out a heart attack, particularly when the pain is new, severe, persistent, or accompanied by shortness of breath, sweating, dizziness, or other concerning symptoms.

Preventing Heart Attacks

Heart attack prevention involves controlling important cardiovascular risk factors such as high blood pressure, high cholesterol, diabetes, and excess body weight, as well as avoiding smoking, following a heart-healthy diet, maintaining appropriate physical activity, taking prescribed medications correctly, and attending regular medical follow-up.

Dr. Hend El-Sousy confirms that heart attacks of different types require awareness of their symptoms and rapid medical evaluation, with types including STEMI, NSTEMI, and Type 1 through Type 5 myocardial infarction, while diagnosis depends on combining symptoms, clinical examination, ECG findings, cardiac troponin testing, and appropriate investigations, and early treatment, restoration of blood flow, and management of cardiovascular risk factors are essential components of effective cardiac care.