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Myocardial infarction
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"Heart attack" redirects here. For other uses, see Heart attack (disambiguation).
Myocardial infarction
Synonyms
Acute myocardial infarction (AMI), heart attack
Diagram showing the blood supply to the heart by the two major blood vessels, the left and right coronary arteries (labelled LCA and RCA). A myocardial infarction (2) has occurred with blockage of a branch of the left coronary artery (1).
Specialty
Cardiology
Symptoms
Chest pain, shortness of breath, nausea, feeling faint, cold sweat, feeling tired[1]
Complications
Heart failure, irregular heartbeat, cardiogenic shock, cardiac arrest[2][3]
Causes
Usually coronary artery disease[2]
Risk factors
High blood pressure, smoking, diabetes, lack of exercise, obesity, high blood cholesterol[4][5]
Diagnostic method
Electrocardiograms (ECGs), blood tests, coronary angiography[6]
Treatment
Percutaneous coronary intervention, thrombolysis[7]
Medication
Aspirin, nitroglycerin, heparin[7][8]
Prognosis
STEMI 10% risk of death (developed world)[7]
Frequency
15.9 million (2015)[9]
[edit on Wikidata]
Myocardial infarction (MI), commonly known as a heart attack, occurs when blood flow decreases or stops to a part of the heart, causing damage to the heart muscle.[1] The most common symptom is chest pain or discomfort which may travel into the shoulder, arm, back, neck, or jaw.[1] Often it occurs in the center or left side of the chest and lasts for more than a few minutes.[1] The discomfort may occasionally feel like heartburn.[1] Other symptoms may include shortness of breath, nausea, feeling faint, a cold sweat, or feeling tired.[1] About 30% of people have atypical symptoms.[7] Women more often have atypical symptoms than men.[10] Among those over 75 years old, about 5% have had an MI with little or no history of symptoms.[11] An MI may cause heart failure, an irregular heartbeat, cardiogenic shock, or cardiac arrest.[2][3]
Most MIs occur due to coronary artery disease.[2] Risk factors include high blood pressure, smoking, diabetes, lack of exercise, obesity, high blood cholesterol, poor diet, and excessive alcohol intake, among others.[4][5] The complete blockage of a coronary artery caused by a rupture of an atherosclerotic plaque is usually the underlying mechanism of an MI.[2] MIs are less commonly caused by coronary artery spasms, which may be due to cocaine, significant emotional stress, and extreme cold, among others.[12][13] A number of tests are useful to help with diagnosis, including electrocardiograms (ECGs), blood tests, and coronary angiography.[6] An ECG, which is a recording of the heart's electrical activity, may confirm an ST elevation MI (STEMI) if ST elevation is present.[7][14] Commonly used blood tests include troponin and less often creatine kinase MB.[6]
Treatment of an MI is time critical.[15] Aspirin is an appropriate immediate treatment for a suspected MI.[8] Nitroglycerin or opioids may be used to help with chest pain; however, they do not improve overall outcomes.[7][8] Supplemental oxygen should be used in those with low oxygen levels or shortness of breath.[8] In a STEMI, treatments attempt to restore blood flow to the heart, and include percutaneous coronary intervention (PCI), where the arteries are pushed open and may be stented, or thrombolysis, where the blockage is removed using medications.[7] People who have a non-ST elevation myocardial infarction (NSTEMI) are often managed with the blood thinner heparin, with the additional use of PCI in those at high risk.[8] In people with blockages of multiple coronary arteries and diabetes, coronary artery bypass surgery (CABG) may be recommended rather than angioplasty.[16] After an MI, lifestyle modifications, along with long term treatment with aspirin, beta blockers, and statins, are typically recommended.[7]
Worldwide, about 15.9 million myocardial infarctions occurred in 2015.[9] More than 3 million people had an ST elevation MI and more than 4 million had an NSTEMI.[17] STEMIs occur about twice as often in men as women.[18] About one million people have an MI each year in the United States.[2] In the developed world the risk of death in those who have had an STEMI is about 10%.[7] Rates of MI for a given age have decreased globally between 1990 and 2010.[19] In 2011, AMI was one of the top five most expensive conditions during inpatient hospitalizations in the US, with a cost of about $11.5 billion for 612,000 hospital stays.[20]
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Video explanation
Contents
[hide]
1 Terminology
2 Signs and symptoms
2.1 Pain
2.2 Other symptoms
3 Causes
3.1 Diet
3.2 Genetics
3.3 Other
4 Mechanism
4.1 Atherosclerosis
4.2 Other causes
4.3 Tissue death
5 Diagnosis
5.1 Criteria
5.2 Types
5.3 Cardiac biomarkers
5.4 Electrocardiogram
5.5 Imaging
5.6 Differential diagnosis
6 Management
6.1 Pain
6.2 Anticoagulation
6.3 Angiogram
6.4 Fibrinolysis
6.5 Other
6.6 Rehabilitation
7 Prevention
7.1 Primary prevention
7.1.1 Lifestyle
7.1.2 Medication
7.2 Secondary prevention
7.2.1 Medications
7.2.2 Other
8 Prognosis
8.1 Complications
9 Epidemiology
10 Society and culture
10.1 Legal implications
11 References
12 Further reading
13 External links
Terminology[edit]
Main article: Acute coronary syndrome
Myocardial infarction (MI) refers to tissue death (infarction) of the heart muscle (myocardium). It is a type of acute coronary syndrome, which describes a sudden or short-term change in symptoms related to blood flow to the heart.[21] Unlike other causes of acute coronary syndromes, such as unstable angina, a myocardial infarction occurs when there is cell death, as measured by a blood test of cardiac enzymes such as troponin or CK-MB.[15] When there is evidence of an MI, it may be classified as an ST elevation myocardial infarction (STEMI) or Non-ST elevation myocardial infarction (NSTEMI) based on the results of an ECG.[22]
The phrase "heart attack" is often used non-specifically to refer to a myocardial infarction and to sudden cardiac death. An MI is different from—but can cause—cardiac arrest, where the heart is not contracting at all or so poorly that all vital organs cease to function, thus causing death. It is also distinct from heart failure, in which the pumping action of the heart is impaired. However, an MI may lead to heart failure.[23]
Signs and symptoms[edit]
Areas where pain is experienced in myocardial infarction, showing common (dark red) and less common (light red) areas on the chest and back.
Pain[edit]
Chest pain is the most common symptom of acute myocardial infarction and is often described as a sensation of tightness, pressure, or squeezing. Pain radiates most often to the left arm, but may also radiate to the lower jaw, neck, right arm, back, and upper abdomen.[24] The pain most suggestive of an acute MI, with the highest likelihood ratio, is pain radiating to the right arm and shoulder.[25] Similarly, chest pain similar to a previous heart attack is also suggestive.[26] The pain associated with MI is usually diffuse, does not change with position, and lasts for more than 20 minutes.[22] Levine's sign, in which a person localizes the chest pain by clenching one or both fists over their sternum, has classically been thought to be predictive of cardiac chest pain, although a prospective observational study showed it had a poor positive predictive value.[27] Pain that responds to nitroglycerin does not indicate the presence or absence of a myocardial infarction.[28]
Other symptoms[edit]
Chest pain may be accompanied by sweating, nausea or vomiting, and fainting,[22][25] and these symptoms may also occur without any pain at all.[24] In women, the most common symptoms of myocardial infarction include shortness of breath, weakness, and fatigue.[29] Shortness of breath is a common, and sometimes the only symptom, occurring when damage to the heart limits the output of the left ventricle, with breathlessness arising either from low oxygen in the blood, or pulmonary edema.[24][30] Other less common symptoms include weakness, light-headedness, palpitations, and abnormalities in heart rate or blood pressure.[15] These symptoms are likely induced by a massive surge of catecholamines from the sympathetic nervous system, which occurs in response to pain and, where present, low blood pressure.[31] Loss of consciousness due to inadequate blood flow to the brain and cardiogenic shock, and sudden death, frequently due to the development of ventricular fibrillation, can occur in myocardial infarctions.[23] Cardiac arrest, and atypical symptoms such as palpitations, occur more frequently in women, the elderly, those with diabetes, in people who have just had surgery, and in critically ill patients.[22]
"Silent" myocardial infarctions can happen without any symptoms at all.[11] These cases can be discovered later on electrocardiograms, using blood enzyme tests, or at autopsy after a person has died. Such silent myocardial infarctions represent between 22 and 64% of all infarctions,[11] and are more common in the elderly,[11] in those with diabetes mellitus[15] and after heart transplantation. In people with diabetes, differences in pain threshold, autonomic neuropathy, and psychological factors have been cited as possible explanations for the lack of symptoms.[32] In heart transplantation, the donor heart is not fully innervated by the nervous system of the recipient.[33]
Causes[edit]
The most prominent risk factors for myocardial infarction are older age, actively smoking, high blood pressure, diabetes mellitus, and total cholesterol and high-density lipoprotein levels.[18] Many risk factors of myocardial infarction are shared with coronary artery disease, the primary cause of myocardial infarction,[15] with other risk factors including male sex, low levels of physical activity, a past family history, obesity, and alcohol use.[15] Risk factors for myocardial disease are often included in risk factor stratification scores, such as the Framingham risk score.[18] At any given age, men are more at risk than women for the development of cardiovascular disease.[34] High levels of blood cholesterol is a known risk factor, particularly high low-density lipoprotein, low high-density lipoprotein, and high triglycerides.[35]
Many risk factors for myocardial infarction are potentially modifiable, with the most important being tobacco smoking (including secondhand smoke).[15] Smoking appears to be the cause of about 36% and obesity the cause of 20% of coronary artery disease.[36] Lack of physical activity has been linked to 7–12% of cases.[36][37] Less common causes include stress-related causes such as job stress, which accounts for about 3% of cases,[36] and chronic high stress levels.[38]
Diet[edit]
There is varying evidence about the importance of saturated fat in the development of myocardial infarctions. Eating polyunsaturated fat instead of saturated fats has been shown in studies to be associated with a decreased risk of myocardial infarction,[39] while other studies find little evidence that reducing dietary saturated fat or increasing polyunsaturated fat intake affects heart attack risk.[40][41] Dietary cholesterol does not appear to have a significant effect on blood cholesterol and thus recommendations about its consumption may not be needed.[42] Trans fats do appear to increase risk.[40] Acute and prolonged intake of high quantities of alcoholic drinks (3–4 or more) increases the risk of a heart attack.[43]
Genetics[edit]
Family history of ischemic heart disease or MI, particularly if one has a male first-degree relative (father, brother) who had a myocardial infarction before age 55 years, or a female first-degree relative (mother, sister) less than age 65 increases a person's risk of MI.[34]
Genome-wide association studies have found 27 genetic variants that are associated with an increased risk of myocardial infarction.[44] The strongest association of MI has been found with chromosome 9 on the short arm p at locus 21, which contains genes CDKN2A and 2B, although the single nucleotide polymorphisms that are implicated are within a non-coding region.[44] The majority of these variants are in regions that have not been previously implicated in coronary artery disease. The following genes have an association with MI: PCSK9, SORT1, MIA3, WDR12, MRAS, PHACTR1, LPA, TCF21, MTHFDSL, ZC3HC1, CDKN2A, 2B, ABO, PDGF0, APOA5, MNF1ASM283, COL4A1, HHIPC1, SMAD3, ADAMTS7, RAS1, SMG6, SNF8, LDLR, SLC5A3, MRPS6, KCNE2.[44]
Other[edit]
The risk of having a myocardial infarction increases with older age, low physical activity, and low socioeconomic status.[34] Heart attacks appear to occur more commonly in the morning hours, especially between 6AM and noon.[45] Evidence suggests that heart attacks are at least three times more likely to occur in the morning than in the late evening.[46] Shift work is also associated with a higher risk of MI.[47]
Women who use combined oral contraceptive pills have a modestly increased risk of myocardial infarction, especially in the presence of other risk factors.[48] The use of non-steroidal anti inflammatory drugs (NSAIDs), even for as short as a week, increases risk.[49]
Endometriosis in women under the age of 40 is an identified risk factor.[50]
Short-term exposure to air pollution such as carbon monoxide, nitrogen dioxide, and sulfur dioxide (but not ozone) have been associated with MI.[51]
A number of acute and chronic infections including Chlamydophila pneumoniae, influenza, Helicobacter pylori, and Porphyromonas gingivalis among others have been linked to atherosclerosis and myocardial infarction.[52] As of 2013, there is no evidence of benefit from antibiotics or vaccination, however, calling the association into question.[52][53] Myocardial infarction can also occur as a late consequence of Kawasaki disease.[54]
Calcium deposits in the coronary arteries can be detected with CT scans. Calcium seen in coronary arteries can provide predictive information beyond that of classical risk factors.[55] High blood levels of the amino acid homocysteine is associated with premature atherosclerosis;[56] whether elevated homocysteine in the normal range is causal is controversial.[57]
Mechanism[edit]
Atherosclerosis[edit]
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The animation shows how plaque buildup or a coronary artery spasm can lead to a heart attack and how blocked blood flow in a coronary artery can lead to a heart attack.
A myocardial infarction occurs when an atherosclerotic plaque slowly builds up in the inner lining of a coronary artery and then suddenly ruptures, causing catastrophic thrombus formation, totally occluding the artery and preventing blood flow downstream.
Further information: Atherosclerosis
The most common cause of a myocardial infarction is the rupture of an atherosclerotic plaque on an artery supplying heart muscle.[23][58] Plaques can become unstable, rupture, and additionally promote the formation of a blood clot that blocks the artery; this can occur in minutes. Blockage of an artery can lead to tissue death in tissue being supplied by that artery.[59] Atherosclerotic plaques are often present for decades before they result in symptoms.[59]
The gradual buildup of cholesterol and fibrous tissue in plaques in the wall of the coronary arteries or other arteries, typically over decades, is termed atherosclerosis.[60] Atherosclerosis is characterized by progressive inflammation of the walls of the arteries.[59] Inflammatory cells, particularly macrophages, move into affected arterial walls. Over time, they become laden with cholesterol products, particularly LDL, and become foam cells. A cholesterol core forms as foam cells die. In response to growth factors secreted by macrophages, smooth muscle and other cells move into the plaque and act to stabilize it. A stable plaque may have a thick fibrous cap with calcification. If there is ongoing inflammation, the cap may be thin or ulcerate. Exposed to the pressure associated with blood flow, plaques, especially those with a thin lining, may rupture and trigger the formation of a blood clot (thrombus).[59]
Other causes[edit]
Atherosclerotic disease is not the only cause of myocardial infarction, and it may exacerbate or contribute to other causes. A myocardial infarction may result from a heart with a limited blood supply subject to increased oxygen demands, such as in fever, a fast heart rate, hyperthyroidism, too few red blood cells in the bloodstream, or low blood pressure. Damage or failure of procedures such as percutaneous coronary intervention or coronary artery bypass grafts may cause a myocardial infarction. Spasm of coronary arteries, such as Prinzmetal's angina may cause blockage.[24][22]
Tissue death[edit]
Drawing of the heart showing anterior left ventricle wall infarction
If impaired blood flow to the heart lasts long enough, it triggers a process called the ischemic cascade; the heart cells in the territory of the blocked coronary artery die (infarction), chiefly through necrosis, and do not grow back. A collagen scar forms in their place.[59] When an artery is blocked, cells lack oxygen, needed to produce ATP in mitochondria. ATP is required for the maintenance of electrolyte balance, particularly through the Na/K ATPase. This leads to an ischemic cascade of intracellular changes, necrosis and apoptosis of affected cells.[61]
Cells in the area with the worst blood supply, just below the inner surface of the heart (endocardium), are most susceptible to damage.[62] Ischemia first affects this region, the subendocardial region, and tissue begins to die within 15–30 minutes of loss of blood supply.[63] The dead tissue is surrounded by a zone of potentially reversible ischemia that progresses to become a full-thickness transmural infarct.[61][63] The initial "wave" of infarction can take place over 3–4 hours.[59][61] These changes are seen on gross pathology and cannot be predicted by the presence or absence of Q waves on an ECG.[62] The position, size and extent of an infarct depends on the affected artery, totality of the blockage, duration of the blockage, the presence of collateral blood vessels, oxygen demand, and success of interventional procedures.[24][58]
Tissue death and myocardial scarring alter the normal conduction pathways of the heart, and weaken affected areas. The size and location puts a person at risk of abnormal heart rhythms (arrhythmias) or heart block, aneurysm of the heart ventricles, inflammation of the heart wall following infarction, and rupture of the heart wall that can rupture with catastrophic consequences.[58][64]
Diagnosis[edit]
Main article: Myocardial infarction diagnosis
Criteria[edit]
An acute myocardial infarction, according to current consensus, is defined by an elevated cardiac biomarker and at least one of the following:[22]
Symptoms relating to ischemia
Changes on an electrocardiogram (ECG), such as ST segment changes, new left bundle branch block, or Q waves
Changes in the motion of the heart wall on imaging
Demonstration of a thrombus on angiogram or at autopsy.
Types[edit]
Myocardial infarctions are generally clinically classified into ST elevation MI (STEMI) and non-ST elevation MI (NSTEMI). These are based on changes to an ECG.[22] STEMIs make up about 25 – 40% of myocardial infarctions.[18] A more explicit classification system, based on international consensus in 2012, also exists. This classifies myocardial infarctions into five types:[22]
Spontaneous MI related to plaque erosion and/or rupture, fissuring, or dissection
MI related to ischemia, such as from increased oxygen demand or decreased supply, e.g. coronary artery spasm, coronary embolism, anemia, arrhythmias, high blood pressure or low blood pressure
Sudden unexpected cardiac death, including cardiac arrest, where symptoms may suggest MI, an ECG may be taken with suggestive changes, or a blood clot is found in a coronary artery by angiography and/or at autopsy, but where blood samples could not be obtained, or at a time before the appearance of cardiac biomarkers in the blood
Associated with coronary angioplasty or stents
Associated with percutaneous coronary intervention (PCI)
Associated with stent thrombosis as documented by angiography or at autopsy
Associated with CABG
Cardiac biomarkers[edit]
There are a number of different biomarkers used to determine the presence of cardiac muscle damage. Troponins, measured through a blood test, are considered to be the best,[18] and are preferred because they have greater sensitivity and specificity for measuring injury to the heart muscle than other tests.[58] A rise in troponin occurs within 2–3 hours of injury to the heart muscle, and peaks within 1–2 days. The gross value of the troponin, as well as a change over time, are useful in measuring and diagnosing or excluding myocardial infarctions, and the diagnostic accuracy of troponin testing is improving over time.[58] One high-sensitivity cardiac troponin is able to rule out a heart attack as long as the ECG is normal.[65]
Other tests, such as CK-MB or myoglobin, are discouraged.[66] CK-MB is not as specific as troponins for acute myocardial injury, and may be elevated with past cardiac surgery, inflammation or electrical cardioversion; it rises within 4–8 hours and returns to normal within 2–3 days.[24] Copeptin may be useful to rule out MI rapidly when used along with troponin.[67]
Electrocardiogram[edit]
A 12-lead ECG showing a STEMI. Elevation of the ST segment can be seen in some leads.
Electrocardiograms (ECGs) are a series of leads placed on a person's chest that measure electrical activity associated with contraction of heart muscle.[68] The taking of an ECG is an important part in the workup of an AMI,[22] and ECGs are often not just taken once, but may be repeated over minutes to hours, or in response to changes in signs or symptoms.[22]
ECG readouts product a waveform with different labelled features.[68] In addition to a rise in biomarkers, a rise in the ST segment, changes in the shape or flipping of T waves, new Q waves, or a new left bundle branch block can be used to diagnose an AMI.[22] In addition, ST elevation can be used to diagnose an ST segment myocardial infarction (STEMI). A rise must be new, in two adjacent adjacent ECG leads, greater than 2 mm (0.2 mV) for males and greater than 1.5 mm (0.15 mV) in females in all leads except for V2 and V3, where it must be greater than 1 mm (0.1 mV).[18][22] ST elevation is associated with infarction, and may be preceded by changes indicating ischemia, such as ST depression or inversion of the T waves.[68] Abnormalities can help localize the location of an infarct, based on the leads that are affected by changes.[15] Early STEMIs may be preceded by peaked T waves.[18] Other ECG abnormalities relating to complications of acute myocardial infarctions may also be evident, such as atrial or ventricular fibrillation.[69]
Imaging[edit]
Noninvasive imaging plays an important role in the diagnosis and characterisation of myocardial infarction.[22] Tests such as chest X-rays can be used to explore and exclude alternate causes of a person's symptoms.[22] Tests such as stress echocardiography and myocardial perfusion imaging can confirm a diagnosis when a person's history, physical examination (including cardiac examination) ECG, and cardiac biomarkers suggest the likelihood of a problem.[70]
Echocardiography, an ultrasound scan of the heart, is able to visualize the heart, its size, shape, and any abnormal motion of the heart walls as they beat that may indicate a myocardial infarction. The flow of blood can be imaged, and contrast dyes may be given to improve image.[22] Other scans using radioactive contrast include SPECT CT-scans using thallium, sestamibi (MIBI scans) or tetrofosmin; or a PET scan using Fludeoxyglucose or rubidium-82.[22] These nuclear medicine scans can visualize the perfusion of heart muscle.[22] SPECT may also be used to determine viability of tissue, and whether areas of ischemia are inducible.[22][71]
Medical societies and professional guidelines recommend that the physician confirm a person is at high risk for myocardial infarction before conducting imaging tests to make a diagnosis,[70][72] as such tests are unlikely to change management and result in increased costs.[70] Patients who have a normal ECG and who are able to exercise, for example, do not merit routine imaging.[70]
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Poor movement of the heart due to an MI as seen on ultrasound[73]
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Pulmonary edema due to an MI as seen on ultrasound[73]
Differential diagnosis[edit]
There are many causes of chest pain, which can originate from the heart, lungs, gastrointestinal tract, aorta, and other muscles, bones and nerves surrounding the chest.[74] In addition to myocardial infarction, other causes include angina, insufficient blood supply (ischemia) to the heart muscles without evidence of cell death, gastroesophageal reflux disease; pulmonary embolism, tumors of the lungs, pneumonia, rib fracture, costochondritis, and other musculoskeletal injuries.[74] Rarer severe differential diagnoses includes aortic dissection, esophageal rupture, tension pneumothorax, and pericardial effusion causing cardiac tamponade.[75] The chest pain in an MI may mimic heartburn.[23] Causes of sudden-onset breathlessness generally involve the lungs or heart – including pulmonary edema, pneumonia, allergic reactions and asthma, and pulmonary embolus, acute respiratory distress syndrome and metabolic acidosis.[74] There are many different causes of fatigue, and myocardial infarction is not a common cause.[76]
Management[edit]
Main article: Management of acute coronary syndrome
A myocardial infarction requires immediate medical attention. Treatment aims to preserve as much heart muscle as possible, and to prevent further complications.[24] Treatment depends on whether the myocardial infarction is a STEMI or NSTEMI.[58] Treatment in general aims to unblock blood vessels, reduce blot clot enlargement, reduce ischemia, and modify risk factors with the aim of preventing future MIs.[24] In addition, the main treatment for myocardial infarctions with ECG evidence of ST elevation (STEMI) include thrombolysis or percutaneous coronary intervention, although PCI is also ideally conducted within 1–3 days for NSTEMI.[58] In addition to clinical judgement, risk stratification may be used to guide treatment, sometimes including systems such as the TIMI and GRACE (Global Registry of Acute Coronary Events) scoring systems.[15][58][77]
Pain[edit]
The pain associated with myocardial infarction may be treated with nitroglycerin or morphine.[24] Nitroglycerin (given under the tongue or intravenously) may improve the blood supply to the heart, and decrease the work the heart must do.[24] It is an important part of therapy for its pain relief, despite there being no benefit to overall mortality.[24][78] Morphine may also be used, and is effective for the pain associated with STEMI.[24] The evidence for benefit from morphine on overall outcomes, however, is poor and there is some evidence of potential harm.[79][80]
Anticoagulation[edit]
Aspirin, an antiplatelet anticoagulant, is given as a loading dose with the goal of reducing the clot size and reduce further clotting in the affected artery.[24][58] It is known to decrease mortality associated with acute myocardial infarction by at least 50%.[58] P2Y12 inhibitors such as clopidogrel, prasugrel and ticagrelor are given concurrently, also as a loading dose, with the dose depending on whether further surgical management or fibrinolysis is planned.[58] Prasugrel and ticagrelor are recommended in European and American guidelines, as they are active more quickly and consistently than clopidogrel.[58] P2Y12 inhibitors are recommended in both NSTEMI and STEMI, including in PCI, with evidence also to suggest improved mortality.[58] Heparins, particularly in the unfractionated form, act at several points in the clotting cascade, help to prevent the enlargement of a clot, and are also given in myocardial infarction, owing to evidence suggesting improved mortality rates.[58] In very high-risk scenarios, inhibitors of the platelet glycoprotein αIIbβ3a receptor such as eptifibatide or tirofiban may be used.[58]
There is varying evidence on the mortality benefits in NSTEMI. A 2014 review of P2Y12 inhibitors such as clopidogrel found they do not change the risk of death when given to people with a suspected NSTEMI prior to PCI,[81] nor do heparins change the risk of death.[82] They do decrease the risk of having a further myocardial infarction.[58][82]
Angiogram[edit]
Primary percutaneous coronary intervention (PCI) is the treatment of choice for STEMI if it can be performed in a timely manner, ideally within 90–120 minutes of contact with a medical provider.[58][83] Some recommend it is also done in NSTEMI within 1–3 days, particularly when considered high-risk.[58] A 2017 review, however, did not find a difference between early versus later PCI in NSTEMI.[84]
PCI involves small probes, inserted through peripheral blood vessels such as the femoral artery or radial artery into the blood vessels of the heart. The probes are then used to identify and clear blockages using small balloons, which are dragged through the blocked segment, dragging away the clot, or the insertion of stents.[24][58] Coronary artery bypass grafting is only considered when the affected area of heart muscle large, and PCI is unsuitable, for example with difficult cardiac anatomy.[85] After PCI, people are generally placed on aspirin indefinitely and on dual antiplatelet therapy (generally aspirin and clopidogrel) for at least a year.[18][58][86]
Fibrinolysis[edit]
If PCI cannot be performed within 90 to 120 minutes in STEMI then fibrinolysis, preferably within 30 minutes of arrival to hospital, is recommended.[58][87] If a person has had symptoms for 12 to 24 hours evidence for effectiveness of thrombolysis is less and if they have had symptoms for more than 24 hours it is not recommended.[88] Thrombolysis involves the administration of medication that activates the enzymes that normally dissolve blood clots. These medications include tissue plasminogen activator, reteplase, streptokinase, and tenecteplase.[24] Thrombolysis is not recommended in a number of situations, particularly when associated with a high risk of bleeding or the potential for problematic bleeding, such as active bleeding, past strokes or bleeds into the brain, or severe hypertension. Situations in which thrombolysis may be considered, but with caution, include recent surgery, use of anticoagulants, pregnancy, and proclivity to bleeding.[24] Major risks of thrombolysis are major bleeding and intracranial bleeding.[24] Pre-hospital thrombolysis reduces time to thrombolytic treatment, based on studies conducted in higher income countries, however it is unclear whether this has an impact on mortality rates.[89]
Other[edit]
In the past, high flow oxygen was recommended for everyone with a possible myocardial infarction.[66] More recently, no evidence was found for routine use with potential of harm.[90][91][92] Therefore, oxygen is currently only recommended if oxygen levels are found to be low or if someone is in respiratory distress.[24][66]
If despite thrombolysis there is significant cardiogenic shock, continued severe chest pain, or less than a 50% improvement in ST elevation on the ECG recording after 90 minutes, then rescue PCI is indicated emergently.[93][94]
Those who have had cardiac arrest may benefit from targeted temperature management with evaluation for implementation of hypothermia protocols. Furthermore, those with cardiac arrest, and ST elevation at any time, should usually have angiography.[95]
Rehabilitation[edit]
Cardiac rehabilitation benefits many who have experienced myocardial infarction,[58] even if there has been substantial heart damage and resultant left ventricular failure. It should start soon after discharge from the hospital. The program may include lifestyle advice, exercise, social support, as well as recommendations about driving, flying, sport participation, stress management, and sexual intercourse.[96]
Prevention[edit]
There is a large crossover between the lifestyle and activity recommendations to prevent a myocardial infarction, and those that may be adopted as secondary prevention after an initial myocardial infarction,[58] because of shared risk factors and an aim to reduce atherosclerosis affecting heart vessels.[24]
Primary prevention[edit]
Lifestyle[edit]
Physical activity can reduce the risk of cardiovascular disease, and people at risk are advised to engage in 150 minutes of moderate or 75 minutes of vigorous intensity aerobic exercise a week.[97] Keeping a healthy weight, drinking alcohol within the recommended limits, and quitting smoking reduce the risk of cardiovascular disease.[97]
Substituting polyunsaturated fats such as olive oil and rapeseed oil instead saturated fats may reduce the risk of myocardial infarction,[39] although there is not universal agreement.[40] Dietary modifications are recommended by some national authorities, with recommendations including increasing the intake of wholegrain starch, reducing sugar intake (particularly of refined sugar), consuming five portions of fruit and vegetables daily, consuming two or more portions of fish per week, and consuming 4–5 portions of unsalted nuts, seeds, or legumes per week.[97] The dietary pattern with the greatest support is the Mediterranean diet.[98] Vitamins and mineral supplements are of no proven benefit,[99] and neither are plant stanols or sterols.[97]
Public health measures may also act at a population level to reduce the risk of myocardial infarction, for example by reduce unhealthy diets (excessive salt, saturated fat and trans fat) including food labeling and marketing requirements as well as requirements for catering and restaurants, and stimulating physical activity. This may be part of regional cardiovascular disease prevention programs, or through the health impact assessment of regional and local plans and policies.[100]
Most guidelines recommend combining different preventive strategies. A 2015 Cochrane Review found some evidence that such an approach might help with blood pressure, body mass index and waist circumference. However, there was insufficient evidence to show an effect on mortality or actual cardio-vascular events.[101]
Medication[edit]
Statins, drugs that act to lower blood cholesterol, decrease the incidence and mortality rates of myocardial infarctions.[102] They are often recommended in those at an elevated risk of cardiovascular diseases.[97]
Aspirin has been studied extensively in people considered at increased risk of myocardial infarction. Based on numerous studies in different groups (e.g. people with or without diabetes), there does not appear to be a benefit strong enough to outweigh the risk of excessive bleeding.[103][104] Nevertheless, many clinical practice guidelines continue to recommend aspirin for primary prevention,[105] and some researchers feel that those with very high cardiovascular risk but low risk of bleeding should continue to receive aspirin.[106]
Secondary prevention[edit]
There is a large crossover between the lifestyle and activity recommendations to prevent a myocardial infarction, and those that may be adopted as secondary prevention after an initial myocardial infarct.[58] Recommendations include stopping smoking, a gradual return to exercise, eating a healthy diet, low in saturated fat and low in cholesterol, and drinking alcohol within recommended limits, exercising, and trying to achieve a healthy weight.[58][96] Exercise is both safe and effective even if people have had stents or heart failure,[107] and is recommended to start gradually after 1–2 weeks.[58] Counselling should be provided relating to medications used, and for warning signs of depression.[58] Previous studies suggested a benefit from omega-3 fatty acid supplementation but this has not been confirmed.[96]
Medications[edit]
Following a heart attack, nitrates, when taken for two days, and ACE-inhibitors decrease the risk of death.[108] Other medications include:
Aspirin is continued indefinitely, as well as another antiplatelet agent such as clopidogrel or ticagrelor ("dual antiplatelet therapy" or DAPT) for up to twelve months.[96] If someone has another medical condition that requires anticoagulation (e.g. with warfarin) this may need to be adjusted based on risk of further cardiac events as well as bleeding risk.[96] In those who have had a stent, more than 12 months of clopidogrel plus aspirin does not affect the risk of death.[109]
Beta blocker therapy such as metoprolol or carvedilol is recommended to be started within 24 hours, provided there is no acute heart failure or heart block.[18][66] The dose should be increased to the highest tolerated.[96] Contrary to what was long believed, the use of beta blockers does not appear to affect the risk of death, possibly because other treatments for MI have improved.[110] When beta blocker medication is given within the first 24–72 hours of a STEMI no lives are saved. However, 1 in 200 people were prevented from a repeat heart attack, and another 1 in 200 from having an abnormal heart rhythm. Additionally, for 1 in 91 the medication causes a temporary decrease in the heart's ability to pump blood.[111]
ACE inhibitor therapy should be started within 24 hours, and continued indefinitely at the highest tolerated dose. This is provided there is no evidence of worsening kidney failure, high potassium, low blood pressure, or known narrowing of the renal arteries.[58] Those who cannot tolerate ACE inhibitors may be treated with an angiotensin II receptor antagonist.[96]
Statin therapy has been shown to reduce mortality and subsequent cardiac events, and should be commenced with the aim of lowering LDL cholesterol. Other medications, such as ezetimibe, may also be added with this goal in mind.[58]
Aldosterone antagonists (spironolactone or eplerenone) may be used if there is evidence of left ventricular dysfunction after an MI, ideally after beginning treatment with an ACE inhibitor.[96]
Other[edit]
A defibrillator, an electric device connected to the heart and surgically inserted under the skin, may be recommended. This is particularly if there are any ongoing signs of heart failure, with a low left ventricular ejection fraction and a New York Heart Association grade II or III after 40 days of the infarction.[58] Defibrillators detect potentially fatal arrhythmia and deliver an electrical shock to the person to depolarize a critical mass of the heart muscle.[112]
Prognosis[edit]
The prognosis after myocardial infarction varies greatly depending on the extent and location of the affected heart muscle, and the development and management of complications.[15] Prognosis is worse with older age, and social isolation.[15] Anterior infarcts, persistent ventricular tachycardia or fibrillation, development of heart blocks, and left ventricular impairment are all associated with poorer prognosis.[15] Without treatment, about a quarter of those affected by MI die within minutes, and about forty percent within the first month.[15] Morbidity and mortality from myocardial infarction has however improved over the years due to earlier and better treatment:[25] in those who have an STEMI in the United States, between 5 and 6 percent die before leaving the hospital and 7 to 18 percent die within a year.[18]
Complications[edit]
Main article: Myocardial infarction complications
Complications may occur immediately following the myocardial infarction or may take time to develop. Disturbances of heart rhythms, including atrial fibrillation, ventricular tachycardia and fibrillation and heart block can arise as a result of ischemia, cardiac scarring, and infarct location.[15][58] Stroke is also a risk, either as a result of clots transmitted from the heart during PCI, as a result of bleeding following anticoagulation, or as a result of disturbances in the heart's ability to pump effectively as a result of the infarction.[58] Regurgitation of blood through the mitral valve is possible, particularly if the infarction causes dysfunction of the papillary muscle.[58] Cardiogenic shock as a result of the heart being unable to adequately pump blood may develop, dependent on infarct size, and is most likely to occur within the days following an acute myocardial infarction. Cardiogenic shock is the largest cause of in-hospital mortality.[25][58] Rupture of the ventricular dividing wall or left ventricular wall may occur within the initial weeks.[58] Dressler's syndrome, a reaction following larger infarcts and a cause of pericarditis is also possible.[58]
Heart failure may develop as a long-term consequence, with an impaired ability of heard muscle to pump, scarring, and increase in size of the existing muscle. Aneurysm of the left ventricle myocardium develops in about 10% of MI and is itself a risk factor for heart failure, ventricular arrhythmia and the development of clots.[15]
Risk factors for complications and death risk factors for death include age, hemodynamic parameters (such as heart failure, cardiac arrest on admission, systolic blood pressure, or Killip class of two or greater), ST-segment deviation, diabetes, serum creatinine, peripheral vascular disease, and elevation of cardiac markers.[113][114][115]
Epidemiology[edit]
Myocardial infarction is a common presentation of coronary artery disease. The World Health Organization estimated in 2004, that 12.2% of worldwide deaths were from ischemic heart disease;[116] with it being the leading cause of death in high- or middle-income countries and second only to lower respiratory infections in lower-income countries.[116] Worldwide, more than 3 million people have STEMIs and 4 million have NSTEMIs a year.[17] STEMIs occur about twice as often in men as women.[18]
Rates of death from ischemic heart disease (IHD) have slowed or declined in most high-income countries, although cardiovascular disease still accounted for one in three of all deaths in the USA in 2008.[117] For example, rates of death from cardiovascular disease have decreased almost a third between 2001 and 2011 in the United States.[118]
In contrast, IHD is becoming a more common cause of death in the developing world. For example, in India, IHD had become the leading cause of death by 2004, accounting for 1.46 million deaths (14% of total deaths) and deaths due to IHD were expected to double during 1985–2015.[119] Globally, disability adjusted life years (DALYs) lost to ischemic heart disease are predicted to account for 5.5% of total DALYs in 2030, making it the second-most-important cause of disability (after unipolar depressive disorder), as well as the leading cause of death by this date.[116]
Society and culture[edit]
Depictions of heart attacks in popular media often include collapsing or loss of consciousness which are not common symptoms; these depictions contribute to widespread misunderstanding about the symptoms of myocardial infarctions, which in turn contributes to people not getting care when they should.[120]
Legal implications[edit]
At common law, in general, a myocardial infarction is a disease, but may sometimes be an injury. This can create coverage issues in the administration of no-fault insurance schemes such as workers' compensation. In general, a heart attack is not covered;[121] however, it may be a work-related injury if it results, for example, from unusual emotional stress or unusual exertion.[122] In addition, in some jurisdictions, heart attacks suffered by persons in particular occupations such as police officers may be classified as line-of-duty injuries by statute or policy. In some countries or states, a person having suffered from an MI may be prevented from participating in activity that puts other people's lives at risk, for example driving a car or flying an airplane.[123]
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Further reading[edit]
Levine, Glenn N.; Bates, Eric R.; Blankenship, James C.; Bailey, Steven R.; Bittl, John A.; Cercek, Bojan; Chambers, Charles E.; Ellis, Stephen G.; Guyton, Robert A. (2016-03-15). "2015 ACC/AHA/SCAI Focused Update on Primary Percutaneous Coronary Intervention for Patients With ST-Elevation Myocardial Infarction: An Update of the 2011 ACCF/AHA/SCAI Guideline for Percutaneous Coronary Intervention and the 2013 ACCF/AHA Guideline for the Management of ST-Elevation Myocardial Infarction". Circulation. 133 (11): 1135–1147. ISSN 0009-7322. PMID 26490017. doi:10.1161/CIR.0000000000000336.
External links[edit]
Classification
V · T · D
ICD-10: I21-I22
ICD-9-CM: 410
MeSH: D009203
DiseasesDB: 8664
External resources
MedlinePlus: 000195
eMedicine: med/1567 emerg/327 ped/2520
Patient UK: Myocardial infarction

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LCCN: sh85059683
GND: 4024654-1
BNF: cb11932573j (data)
NDL: 00571052
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Heart attack (disambiguation)

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Right coronary arteries

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Cardiac arrhythmia

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Lack of exercise

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Diagnostic method

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Coronary angiography

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Coronary artery

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Coronary artery spasm

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ST elevation MI

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Beta blockers

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Human sternum

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Positive predictive value

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Fatigue (physical)

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Left ventricle

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Sudden cardiac death

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Family history

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Alcohol use

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Framingham risk score

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Secondhand smoke

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Workplace stress

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Ischemic heart disease

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Genome-wide association studies

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Chromosome 9

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Single nucleotide polymorphisms

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Smooth muscle

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Coronary artery bypass graft

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Na/K ATPase

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Dressler's syndrome

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Coronary angioplasty

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Contiguous leads

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Chest X-ray

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Contrast dye

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Thallium chloride

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Angina pectoris

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Esophageal rupture

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Tension pneumothorax

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P2Y12 inhibitors

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Clotting cascade

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Balloon angioplasty

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Aspiration thrombectomy

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Coronary stenting

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Coronary artery bypass grafting

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Intracranial bleed

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Left ventricular failure

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Secondary prevention

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Rapeseed oil

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Waist circumference

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Clinical practice guideline

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Aldosterone antagonist

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Mitral regurgitation

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Systole (medicine)

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Disability adjusted life year

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Industrial injury

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