Management of acute coronary syndrome

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Management of acute coronary syndrome
Heart attack-NIH.gif
Acute coronary syndromes are commonly caused by a blood clot forming on an atherosclerotic plaque in a coronary artery. Oxygen delivery to a part of heart muscle is blocked, eventually causing cell death.
Specialty Cardiology

Management of acute coronary syndrome is targeted against the effects of reduced blood flow to the affected area of the heart muscle, usually because of a blood clot in one of the coronary arteries, the vessels that supply oxygenated blood to the myocardium. This is achieved with urgent hospitalization and medical therapy, including drugs that relieve chest pain and reduce the size of the infarct, and drugs that inhibit clot formation; for a subset of patients invasive measures are also employed (coronary angiography and percutaneous coronary intervention). Basic principles of management are the same for all types of acute coronary syndrome. However, some important aspects of treatment depend on the presence or absence of elevation of the ST segment on the electrocardiogram, which classifies cases upon presentation to either ST segment elevation myocardial infarction (STEMI) or non-ST elevation acute coronary syndrome (NST-ACS); the latter includes unstable angina and non-ST elevation myocardial infarction (NSTEMI). Treatment is generally more aggressive for STEMI patients, and reperfusion therapy is more often reserved for them. Long-term therapy is necessary for prevention of recurrent events and complications. [1]

Contents

General principles

Acute coronary syndromes are caused by sudden and critical reduction of blood flow in one of the coronary arteries, the vessels that supply oxygenated blood to the myocardium (heart muscle), typically by a blood clot. The principal symptom is typically chest pain, known as angina pectoris; people who present with angina must prompt evaluation for possible acute coronary syndrome. [2]

Acute coronary syndromes are classified to two major categories, according to the patient's electrocardiogram, and specifically the presence or absence of persistent (>20 min) ST segment elevation (or left bundle branch block). [2] Patients with acute coronary syndrome and ST elevation are said to have ST-elevation myocardial infarction (STEMI) and they tend to have one of their coronary arteries totally blocked. [3] Damage is reversible for approximately 20 [4] -30 [5] minutes after complete obstruction of blood flow; thereafter myocardial cell death ensues and progresses as time passes. Therefore, complete and sustained restoration of blood flow must be as prompt as possible to ensure maximum salvage of functional myocardium, a principle expressed in the maxim "time is muscle". [6] This is achieved with reperfusion therapy, which is based on invasive reopening of the affected coronary artery with primary percutaneous coronary intervention, or non-invasive breaking up of the responsible blood clot with a thrombolytic drug. [7]

Patients without ST segment elevation are said to have non-ST-elevation acute coronary syndrome and tend not to have full occlusion of a coronary artery. If there is evidence of myocardial cell death (especially elevated cardiac biomarkers) they are considered to have a non-ST-elevation myocardial infarction (NSTEMI); otherwise they are classified with unstable angina. [8] Their management is based on the estimation of their risk for adverse events. Patients at low risk can be adequately treated with medical therapy, in many ways similar to the one used for STEMI (but excluding thrombolytics). Those at moderate to high risk benefit from an early invasive strategy, which includes coronary angiography and, if necessary, revascularization with percutaneous coronary intervention or coronary artery bypass surgery. [9]

Medical therapy for acute coronary syndromes is based on drugs that act against ischemia and resultant angina and limit the infarct size (i.e., the area of myocardium that is affected), as well as drugs that inhibit clot formation. The latter include antiplatelet agents, which block the activation and aggregation of platelets (cellular blood components that contribute to clot formation), and anticoagulant agents (which attenuate the coagulation cascade). Long-term therapy in acute coronary syndrome survivors is targeted against recurrence and long-term complications (secondary prevention). [1]

Women are taken less seriously than men when they have a heart attack leading to higher mortality among women. [10]

Patient-dependent initial measures

Information card published by the National Heart, Lung, and Blood Institute urging people with symptoms of angina to call the emergency medical services. Heart Attack Know the Symptoms. Take Action.jpg
Information card published by the National Heart, Lung, and Blood Institute urging people with symptoms of angina to call the emergency medical services.

Because of the relationship between the duration of myocardial ischemia and the extent of damage to heart muscle, public health services encourage people experiencing possible acute coronary syndrome symptoms or those around them to immediately call emergency medical services. [11] [12] [13]

Patients with known coronary artery disease who have been prescribed nitroglycerin should promptly take one dose, and call emergency medical services if their symptoms do not improve within 2–5 minutes. Chewing non−enteric-coated aspirin is encouraged (unless there are contraindications).

Patients should stay calmed in a comfortable position. In case of heart attack, [14] it would not usually be lying down, but sitting down or sitting down with folded knees (but patients would notice the position that fits for them).

Patients should not be transported to hospital by private vehicles instead of an ambulance, unless evacuation by land or air ambulance is impossible (e.g., dangerous weather in a very remote area), and if they must be, it should be done if possible with someone trained in cardiac first aid. [15]

Health care professionals are responsible for teaching their patients at risk of acute coronary syndrome what the symptoms of this condition are, and that it is imperative to seek urgent medical attention in case they present. [16]

Emergency services

Emergency Medical Services (EMS) Systems vary considerably in their ability to evaluate and treat patients with suspected acute myocardial infarction. Some provide as little as first aid and early defibrillation. Others employ highly trained paramedics with sophisticated technology and advanced protocols. [17] Paramedic services are capable of providing oxygen, IV access, sublingual nitroglycerine, morphine, and aspirin. Some advanced paramedic systems can also perform 12-lead ECGs. [18] If a STEMI is recognized the paramedic may be able to contact the local PCI hospital and alert the emergency room physician, and staff of the suspected AMI. Some Paramedic services are capable of providing thrombolytic therapy in the prehospital setting, allowing reperfusion of the myocardium. [19] [20]

With primary PCI emerging as the preferred therapy for ST-segment elevation myocardial infarction, EMS can play a key role in reducing door-to-balloon intervals (the time from presentation to a hospital ER to the restoration of coronary artery blood flow) by performing a 12-lead ECG in the field and using this information to triage the patient to the most appropriate medical facility. [21] [22] [23] [24] In addition, the 12-lead ECG can be transmitted to the receiving hospital, which enables time saving decisions to be made prior to the arrival of the patient. This may include a "cardiac alert" or "STEMI alert" that calls in off duty personnel in areas where the cardiac cath lab is not staffed 24 hours a day. [25] Even in the absence of a formal alerting program, prehospital 12-lead ECGs are independently associated with reduced door to treatment intervals in the emergency department. [26]

Initial diagnostic approach

Typical electrocardiogram of an ST segment elevation myocardial infarction. ST elevation in leads I, aVL and V1-V5 indicates an anterior wall myocardial infarction and is shown in orange; reciprocal ST depression in leads II, III and aVF is shown in blue. 12 Lead EKG ST Elevation tracing color coded.jpg
Typical electrocardiogram of an ST segment elevation myocardial infarction. ST elevation in leads I, aVL and V1-V5 indicates an anterior wall myocardial infarction and is shown in orange; reciprocal ST depression in leads II, III and aVF is shown in blue.

In patients with symptoms typical of myocardial ischemia an electrocardiogram must be immediately obtained - e.g., within 10 minutes from first contact with medical or paramedical personnel, including prehospital setting; the electrocardiographic findings will guide the subsequent management. Patients with elevation of the ST segment (or presumed new left bundle branch block) are treated based on guidelines for ST elevation myocardial infarction (STEMI) and must undergo reperfusion therapy as soon as possible. Serum cardiac biomarkers are routinely obtained and their elevation is necessary for confirming diagnosis of myocardial infarction; [27] however, reperfusion must not be delayed by waiting for the results. Patients without the above findings are initially classified with non ST elevation acute coronary syndrome, and subsequent cardiac biomarker results will differentiate between true non ST elevation myocardial infarction (NSTEMI) and unstable angina. [28] [29] [30]

Relief of angina

Relief of the pain of angina is of paramount importance, not only for humane reasons but because the pain is associated with sympathetic activation that causes vasoconstriction and increases the workload of the heart. [28] The pain of myocardial ischemia is likely to respond to any intervention that improves the relationship between oxygen demand and supply, like nitrates, beta blockers and oxygen. [31]

Nitrates

Nitrates, like nitroglycerin, dilate blood vessels, which is beneficial against myocardial ischemia in two ways: By increasing blood flow in the coronary arteries and the amount of oxygen that arrives to heart muscle; and by relaxing all blood vessels in the body, thereby reducing the workload that heart needs to produce against them and the oxygen it consumes. The preferred mode of administration is sublingually. By relaxing blood vessels nitrates also reduce blood pressure, which must be carefully monitored; they must not be used if hypotension is present. They must also be avoided in patients who have taken sildenafil or other phosphodiesterase type 5 inhibitors (used for erectile dysfunction) within the previous 24–48 hours, as the combination of the two could cause a serious drop in blood pressure. [31] [32] [33] Intravenous nitrates are useful in patients with hypertension or pulmonary edema. [34]

Beta blockers

By reducing sympathetic stimulation of the heart, beta blockers decrease heart rate, blood pressure and cardiac output, and hence heart oxygen consumption. Beta-blockers alleviate ischemic pain, and have also been proved to reduce the size of infarcted heart muscle, the risk of arrhythmias, and the proportion of patients with acute coronary syndrome who actually evolve STEMI. However, they have also been shown to increase the risk of acute heart failure. Their early use is contraindicated if there are signs of congestive heart failure (e.g., Killip class II or above) or hypotension, along with other contraindications to beta blockers (slow heart rate, atrioventricular block); in the absence of contraindications beta blocker therapy should begin in the first 24 hours. It may be prudent to prefer oral rather than intravenous forms. [35]

Oxygen therapy

Initial administration of oxygen to all patients with acute coronary syndrome is common practice; however, there is no evidence to support or refute that supplemental oxygen might be harmful or beneficial for cardiac patients who do not need it. [36] It is currently recommended to give oxygen only to breathless patients or when blood oxygen saturation is low, e.g. <90%. [31] [37]

Analgesics

Analgesic agents that are most commonly used are opioids, and especially morphine, which is considered the analgesic of choice in patients with ST elevation. Along with its pain-controlling properties, morphine also reduces the work of breathing, alleviates breathlessness, reduces anxiety and has favorable action on hemodynamic parameters and cardiac oxygen consumption. [31] [38] [39] However, in patients presenting without ST elevation, morphine has been shown to have adverse events potential, and its use is considered acceptable only after inadequate pain relief by medication specific against angina. [40] Non-steroidal anti-inflammatory drugs are contraindicated for both categories of patients. [40] [41]

Antiplatelet drugs

All patients with acute coronary syndrome must immediately receive antiplatelet therapy, including aspirin and generally a second oral antiplatelet agent. [42] Bleeding is the most important side-effect of antiplatelets.[ citation needed ]

Aspirin

Aspirin inhibits platelet aggregation and formation of blood clots. It is effective across the entire spectrum of acute coronary syndromes; it has been shown to reduce the rate of death in patients with STEMI and in patients presenting without ST elevation. Aspirin is contraindicated in patients with documented allergy or known platelet disorder. Patients who have had gastrointestinal symptoms while on long-term aspirin therapy are usually able to tolerate aspirin in the short term. For patients with true intolerance to aspirin clopidogrel is recommended. Lower doses need days to achieve full antiplatelet effect, therefore a loading dose is necessary for patients who are not already on aspirin. [43]

P2Y12 inhibitors

Aside from aspirin, three antiplatelet agents taken by mouth have been approved for use in acute coronary syndromes, clopidogrel, ticagrelor and prasugrel; all reduce platelet aggregation by inhibiting the P2Y12 receptor, a type of adenosine phosphate receptor, on the surface of platelets. Not all three of them are equally indicated in all types of acute coronary syndromes. In patients with ST elevation the choice of P2Y12 inhibitor depends on reperfusion strategy; for patients undergoing primary percutaneous coronary intervention ticagrelor and prasugrel are considered superior to clopidogrel, as they are more potent and have more rapid onset of action, at the cost of some increase in bleeding risk; for STEMI patients who are treated with fibrinolysis and those who do not undergo reperfusion treatment only clopidogrel is indicated. Prasugrel must not be given to patients with a history of ischemic stroke or aged 75 years or older. In patients with non-ST elevation acute coronary syndrome current guidelines also recommend immediate administration of dual antiplatelet therapy upon diagnosis; clopidogrel and ticagrelor are indicated in this setting, with ticagrelor considered superior for patients undergoing early invasive strategy (see later). However, emerging evidence questions this strategy. [44] As with aspirin, it is necessary to administer a loading dose. [45] [46]

Glycoprotein IIb/IIIa inhibitors

Glycoprotein IIb/IIIa inhibitors are a class of intravenous antiplatelet agents used in patients undergoing percutaneous coronary intervention, consisting of abciximab, eptifibatide and tirofiban. Patients presenting with ST elevation that will be reperfused with percutaneous coronary intervention may receive one of the above agents at the time of catheterization, or perhaps before. Administering eptifibatide or tirofiban may also be reasonable in patients presenting with NST-ACS who are considered of intermediate or high risk and are treated with early invasive strategy. [47] [48]

Anticoagulants

Anticoagulants in acute coronary syndrome are targeted against the coronary blood clot, as well as towards prevention of thrombotic complications, like formation of blood clots in the ventricles, stroke, pulmonary embolism or deep vein thrombosis. [49] Patients undergoing PCI also need an anticoagulant to prevent catheter thrombosis. Options include unfractionated heparin, enoxaparin (a low molecular weight heparin), fondaparinux (a pentasaccharide antagonist of factor Xa) and bivalirudin (a direct thrombin inhibitor); all the above agents are given parenterally (subcutaneously or intravenously). Unfractionated heparin has the disadvantage of requiring dose adjustment based on a laboratory exam, activated partial thromboplastin time (APTT). In STEMI patients choice depends on the reperfusion strategy used (see below); bivalirudin is used when PCI is employed only, while in the same case fondaparinux is not preferred. [50] Similarly, in Non-STE ACS bivalirudin too is only used when an early invasive strategy is chosen. [51]

Reperfusion

Coronary angiography of a STEMI patient, showing partial occlusion of left circumflex coronary artery.jpg
Coronary angiography of a patient with acute myocardial infarction presenting with ST elevation and undergoing primary percutaneous coronary intervention; arrow points at partial occlusion of left circumflex coronary artery; star indicates tip of the guide wire that has been inserted in the artery through the occlusion.
Coronary angiography of a STEMI patient with partial occlusion of left circumflex coronary artery, after being treated with percoutaneous coronary intervention.jpg
Coronary angiography of the same patient, after dilation of the artery with balloon and placement of stent. The occlusion has been successfully treated. [52]

The concept of reperfusion has become so central to the modern treatment of acute myocardial infarction, that we are said to be in the reperfusion era. [53] [54] Patients who present with suspected acute myocardial infarction and ST segment elevation (STEMI) or new bundle branch block on the 12 lead ECG are presumed to have an occlusive thrombosis in an epicardial coronary artery. They are therefore candidates for immediate reperfusion, either with thrombolytic therapy, percutaneous coronary intervention (PCI) or when these therapies are unsuccessful, bypass surgery.[ citation needed ]

Individuals without ST segment elevation are presumed to be experiencing either unstable angina (UA) or non-ST segment elevation myocardial infarction (NSTEMI). They receive many of the same initial therapies and are often stabilized with antiplatelet drugs and anticoagulated. If their condition remains (hemodynamically) stable, they can be offered either late coronary angiography with subsequent restoration of blood flow (revascularization), or non-invasive stress testing to determine if there is significant ischemia that would benefit from revascularization. If hemodynamic instability develops in individuals with NSTEMIs, they may undergo urgent coronary angiography and subsequent revascularization. The use of thrombolytic agents is contraindicated in this patient subset, however. [55]

The basis for this distinction in treatment regimens is that ST segment elevations on an ECG are typically due to complete occlusion of a coronary artery. On the other hand, in NSTEMIs there is typically a sudden narrowing of a coronary artery with preserved (but diminished) flow to the distal myocardium. Anticoagulation and antiplatelet agents are given to prevent the narrowed artery from occluding.[ citation needed ]

At least 10% of patients with STEMI do not develop myocardial necrosis (as evidenced by a rise in cardiac markers) and subsequent Q waves on EKG after reperfusion therapy. Such a successful restoration of flow to the infarct-related artery during an acute myocardial infarction is known as "aborting" the myocardial infarction. If treated within the hour, about 25% of STEMIs can be aborted. [56]

Rehabilitation

Additional objectives are to prevent life-threatening arrhythmias or conduction disturbances. This requires monitoring in a coronary care unit and protocolized administration of antiarrhythmic agents. Antiarrhythmic agents are typically only given to individuals with life-threatening arrhythmias after a myocardial infarction and not to suppress the ventricular ectopy that is often seen after a myocardial infarction. [57] [58] [59]

Cardiac rehabilitation aims to optimize function and quality of life in those affected by a heart disease. This can be with the help of a physician, or in the form of a cardiac rehabilitation program. [60]

Physical exercise is an important part of rehabilitation after a myocardial infarction, with beneficial effects on cholesterol levels, blood pressure, weight, stress and mood. [60] Some patients become afraid of exercising because it might trigger another infarct. [61] Patients are encouraged to exercise, and should only avoid certain exerting activities. Local authorities may place limitations on driving motor vehicles. [62] In most cases, the advice is a gradual increase in physical exercise during about 6–8 weeks following an MI. [63] If it doesn't feel too hard for the patient, the advice about exercise is then the same as applies to anyone else to gain health benefits, that is, at least 20–30 minutes of moderate exercise on most days (at least five days per week) to the extent of getting slightly short of breath. [63]

Some people are afraid to have sex after a heart attack. Most people can resume sexual activities after 3 to 4 weeks. The amount of activity needs to be dosed to the patient's possibilities. [64]

Special cases

Cocaine

Cocaine associated myocardial infarction should be managed in a manner similar to other patients with acute coronary syndrome, except that beta blockers should not be used and benzodiazepines should be administered early. [65] The treatment itself may have complications. If attempts to restore the blood flow are initiated after a critical period of only a few hours, the result may be a reperfusion injury instead of amelioration. [66]

Wilderness setting

In wilderness first aid, a possible heart attack justifies evacuation by the fastest available means, often meaning the initiation of a MEDEVAC. The suspicion or provisional diagnosis of an MI means that it is inappropriate for the patient to walk out of the wilderness setting and will require them to be carried or conveyed in a vehicle. Aspirin, nitroglycerin, and oxygen can all be given with relative ease in a wilderness setting and should be administered as soon as possible in suspected cases of MI. Wilderness management of cardiac arrest differs slightly from that carried out in an urban setting in that it is generally considered acceptable to terminate a resuscitation attempt after 30 minutes if there has been no change in the patient's condition.[ citation needed ]

Air travel

Certified personnel traveling by commercial aircraft may be able to assist an MI patient by using the on-board first aid kit, which may contain some cardiac drugs (such as glyceryl trinitrate spray, aspirin, or opioid painkillers), an AED, [67] and oxygen. Pilots may divert the flight to land at a nearby airport. Cardiac monitors are being introduced by some airlines, and they can be used by both on-board and ground-based physicians. [68]

Related Research Articles

An antianginal is a drug used in the treatment of angina pectoris, a symptom of ischaemic heart disease.

<span class="mw-page-title-main">Coronary artery disease</span> Reduction of blood flow to the heart

Coronary artery disease (CAD), also called coronary heart disease (CHD), or ischemic heart disease (IHD), is a type of heart disease involving the reduction of blood flow to the cardiac muscle due to a build-up of atheromatous plaque in the arteries of the heart. It is the most common of the cardiovascular diseases. CAD can cause stable angina, unstable angina, myocardial ischemia, and myocardial infarction.

<span class="mw-page-title-main">Angina</span> Chest discomfort due to disorder of the heart muscles

Angina, also known as angina pectoris, is chest pain or pressure, usually caused by insufficient blood flow to the heart muscle (myocardium). It is most commonly a symptom of coronary artery disease.

An antiplatelet drug (antiaggregant), also known as a platelet agglutination inhibitor or platelet aggregation inhibitor, is a member of a class of pharmaceuticals that decrease platelet aggregation and inhibit thrombus formation. They are effective in the arterial circulation where classical Vitamin K antagonist anticoagulants have minimal effect.

<span class="mw-page-title-main">Prasugrel</span> Medication used to prevent formation of blood clots

Prasugrel, sold under the brand names Effient and Efient, is a medication used to prevent formation of blood clots. It is a platelet inhibitor and an irreversible antagonist of P2Y12 ADP receptors and is of the thienopyridine drug class. It was developed by Daiichi Sankyo Co. and produced by Ube and marketed in the United States in cooperation with Eli Lilly and Company.

<span class="mw-page-title-main">Acute coronary syndrome</span> Dysfunction of the heart muscles due to insufficient blood flow

Acute coronary syndrome (ACS) is a syndrome due to decreased blood flow in the coronary arteries such that part of the heart muscle is unable to function properly or dies. The most common symptom is centrally located pressure-like chest pain, often radiating to the left shoulder or angle of the jaw, and associated with nausea and sweating. Many people with acute coronary syndromes present with symptoms other than chest pain, particularly women, older people, and people with diabetes mellitus.

<span class="mw-page-title-main">Variant angina</span> Cardiac chest pain at any time, not just periods of exertion

Variant angina, also known as Prinzmetal angina,vasospastic angina, angina inversa, coronary vessel spasm, or coronary artery vasospasm, is a syndrome typically consisting of angina. Variant angina differs from stable angina in that it commonly occurs in individuals who are at rest or even asleep, whereas stable angina is generally triggered by exertion or intense exercise. Variant angina is caused by vasospasm, a narrowing of the coronary arteries due to contraction of the heart's smooth muscle tissue in the vessel walls. In comparison, stable angina is caused by the permanent occlusion of these vessels by atherosclerosis, which is the buildup of fatty plaque and hardening of the arteries.

<span class="mw-page-title-main">Unstable angina</span> Chest pain due to heart muscles that is easily provoked

Unstable angina is a type of angina pectoris that is irregular or more easily provoked. It is classified as a type of acute coronary syndrome.

<span class="mw-page-title-main">Eptifibatide</span> Antiplatelet drug

Eptifibatide, is an antiplatelet drug of the glycoprotein IIb/IIIa inhibitor class. Eptifibatide is a cyclic heptapeptide derived from a disintegrin protein found in the venom of the southeastern pygmy rattlesnake. It belongs to the class of the arginin-glycin-aspartat-mimetics and reversibly binds to platelets. Eptifibatide has a short half-life. The drug is the third inhibitor of GPIIb/IIIa that has found broad acceptance after the specific antibody abciximab and the non-peptide tirofiban entered the global market.

P2Y<sub>12</sub> Protein-coding gene in the species Homo sapiens

P2Y12 is a chemoreceptor for adenosine diphosphate (ADP) that belongs to the Gi class of a group of G protein-coupled (GPCR) purinergic receptors. This P2Y receptor family has several receptor subtypes with different pharmacological selectivity, which overlaps in some cases, for various adenosine and uridine nucleotides. The P2Y12 receptor is involved in platelet aggregation and is thus a biological target for the treatment of thromboembolisms and other clotting disorders. Two transcript variants encoding the same isoform have been identified for this gene.

<span class="mw-page-title-main">Bivalirudin</span> Anticoagulant drug

Bivalirudin, sold under the brand names Angiomax and Angiox, among others, is a specific and reversible direct thrombin inhibitor (DTI). Chemically, it is a synthetic congener of the naturally occurring drug hirudin, found in the saliva of the medicinal leech Hirudo medicinalis. It is manufactured by The Medicines Company.

Door-to-balloon is a time measurement in emergency cardiac care (ECC), specifically in the treatment of ST segment elevation myocardial infarction. The interval starts with the patient's arrival in the emergency department, and ends when a catheter guidewire crosses the culprit lesion in the cardiac cath lab. Because of the adage that "time is muscle", meaning that delays in treating a myocardial infarction increase the likelihood and amount of cardiac muscle damage due to localised hypoxia, ACC/AHA guidelines recommend a door-to-balloon interval of no more than 90 minutes. As of 2006 in the United States, fewer than half of STEMI patients received reperfusion with primary percutaneous coronary intervention (PCI) within the guideline-recommended timeframe. It has become a core quality measure for the Joint Commission on Accreditation of Healthcare Organizations (TJC).

The Thrombolysis In Myocardial Infarction (TIMI) Study Group, is an academic research organization (ARO) affiliated with Brigham and Women's Hospital and Harvard Medical School with a focus in the field of cardiovascular disease. The group has its headquarters in Boston, Massachusetts.

<span class="mw-page-title-main">Coronary stent</span> Medical stent implanted into coronary arteries

A coronary stent is a tube-shaped device placed in the coronary arteries that supply blood to the heart, to keep the arteries open in patients suffering from coronary heart disease. The vast majority of stents used in modern interventional cardiology are drug-eluting stents (DES). They are used in a medical procedure called percutaneous coronary intervention (PCI). Coronary stents are divided into two broad types: drug-eluting and bare metal stents. As of 2023, drug-eluting stents were used in more than 90% of all PCI procedures. Stents reduce angina and have been shown to improve survival and decrease adverse events after a patient has suffered a heart attack—medically termed an acute myocardial infarction.

<span class="mw-page-title-main">Coronary ischemia</span> Medical condition

Coronary ischemia, myocardial ischemia, or cardiac ischemia, is a medical term for abnormally reduced blood flow in the coronary circulation through the coronary arteries. Coronary ischemia is linked to heart disease, and heart attacks. Coronary arteries deliver oxygen-rich blood to the heart muscle. Reduced blood flow to the heart associated with coronary ischemia can result in inadequate oxygen supply to the heart muscle. When oxygen supply to the heart is unable to keep up with oxygen demand from the muscle, the result is the characteristic symptoms of coronary ischemia, the most common of which is chest pain. Chest pain due to coronary ischemia commonly radiates to the arm or neck. Certain individuals such as women, diabetics, and the elderly may present with more varied symptoms. If blood flow through the coronary arteries is stopped completely, cardiac muscle cells may die, known as a myocardial infarction, or heart attack.

<span class="mw-page-title-main">Myocardial infarction</span> Interruption of cardiac blood supply

A myocardial infarction (MI), commonly known as a heart attack, occurs when blood flow decreases or stops in one of the coronary arteries of the heart, causing infarction to the heart muscle. The most common symptom is retrosternal chest pain or discomfort that classically radiates to the left shoulder, arm, or jaw. The pain may occasionally feel like heartburn. This is the dangerous type of Acute coronary syndrome.

<span class="mw-page-title-main">Reperfusion therapy</span> Restoring blood flow post-heart attack

Reperfusion therapy is a medical treatment to restore blood flow, either through or around, blocked arteries, typically after a heart attack. Reperfusion therapy includes drugs and surgery. The drugs are thrombolytics and fibrinolytics used in a process called thrombolysis. Surgeries performed may be minimally-invasive endovascular procedures such as a percutaneous coronary intervention (PCI), which involves coronary angioplasty. The angioplasty uses the insertion of a balloon and/or stents to open up the artery. Other surgeries performed are the more invasive bypass surgeries that graft arteries around blockages.

<span class="mw-page-title-main">Electrocardiography in myocardial infarction</span>

Electrocardiography in suspected myocardial infarction has the main purpose of detecting ischemia or acute coronary injury in emergency department populations coming for symptoms of myocardial infarction (MI). Also, it can distinguish clinically different types of myocardial infarction.

A diagnosis of myocardial infarction is created by integrating the history of the presenting illness and physical examination with electrocardiogram findings and cardiac markers. A coronary angiogram allows visualization of narrowings or obstructions on the heart vessels, and therapeutic measures can follow immediately. At autopsy, a pathologist can diagnose a myocardial infarction based on anatomopathological findings.

<span class="mw-page-title-main">Arterial occlusion</span>

Arterial occlusion is a condition involving partial or complete blockage of blood flow through an artery. Arteries are blood vessels that carry oxygenated blood to body tissues. An occlusion of arteries disrupts oxygen and blood supply to tissues, leading to ischemia. Depending on the extent of ischemia, symptoms of arterial occlusion range from simple soreness and pain that can be relieved with rest, to a lack of sensation or paralysis that could require amputation.

References

  1. 1 2 Current management of acute coronary syndrome is based on guidelines, produced by national and international medical societies according to the principles of evidence-based medicine. Examples are the guidelines of the American Heart Association and American College of Cardiology (O'Gara 2013, Amsterdam 2014) and those of the European Society of Cardiology (Steg 2012, Hamm 2011).
  2. 1 2 Hamm 2011, p. 3004.
  3. ↑ Antman EM (2012a). "Chapter 54. ST-segment elevation myocardial infarction: Pathology, pathophysiology, and clinical features". In Bonow RO, Mann DL, Zipes DP, Libby P (eds.). Braunwald's heart disease: A textbook of cardiovascular medicine (9th ed.). Saunders. pp. 1087–1110. ISBN   978-0-8089-2436-4., p. 1092
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  6. ↑ See:
  7. ↑ Antman 2012b, p. 1118.
  8. ↑ Cannon 2012, p. 1178.
  9. ↑ Cannon 2012, p. 1194.
  10. ↑ Heart attack care dangerously unequal for women, study finds BBC
  11. ↑ Faxon, D; Lenfant, C (2001). "Timing is everything. Motivating patients to call 9-1-1 at onset of acute myocardial infarction". Circulation. 104 (11): 1210–1211. doi: 10.1161/circ.104.11.1210 . PMID   11551867.
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  13. ↑ "Heart attack - Symptoms". National Health Service. Retrieved 22 December 2014.
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  16. ↑ Antman 2012b, p. 1111.
  17. ↑ Antman EM, Anbe DT, Armstrong PW, et al. (August 2004). "ACC/AHA guidelines for the management of patients with ST-elevation myocardial infarction--executive summary. A report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to revise the 1999 guidelines for the management of patients with acute myocardial infarction)". J. Am. Coll. Cardiol. 44 (3): 671–719. doi: 10.1016/j.jacc.2004.07.002 . PMID   15358045.
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