Acute Coronary Syndrome

Acute coronary syndrome (ACS) is a syndrome (a set of signs and symptoms) 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.

Acute coronary syndrome is subdivided in three scenarios depending on the duration of symptoms, the presence of ECG changes and blood test results: ST elevation myocardial infarction (STEMI, 30%), non-ST elevation myocardial infarction (NSTEMI, 25%), or unstable angina (38%). Generally, when symptoms occur for less than 30 minutes, it is unstable angina. When symptoms are prolonged for more than 30 minutes, the diagnosis is acute myocardial infarction.

ACS should be distinguished from ''stable'' angina, which develops during physical activity or stress and resolves at rest. In contrast with stable angina, unstable angina occurs suddenly, often at rest or with minimal exertion, or at lesser degrees of exertion than the individual's previous angina ("crescendo angina"). New-onset angina is also considered unstable angina, since it suggests a new problem in a coronary artery.

Signs and symptoms

The cardinal symptom of critically decreased blood flow to the heart is chest pain, experienced as tightness around or over the chest and (often, but not always) radiating to the left arm and the left angle of the jaw. This may be associated with diaphoresis (sweating), nausea and vomiting, as well as shortness of breath. In many cases, the sensation is "atypical", with pain experienced in different ways or even being completely absent (which is more likely in female patients and those with diabetes). Some may report palpitations, anxiety or a sense of impending doom ( angor animi) and a feeling of being acutely ill. The description of the chest discomfort as a pressure has little utility in aiding a diagnosis as it is not specific for ACS.

Though ACS is usually associated with coronary thrombosis, it can also be associated with cocaine use. Chest pain with features characteristic of cardiac origin (angina) can also be precipitated by profound anemia, brady- or tachycardia (excessively slow or rapid heart rate), low or high blood pressure, severe aortic valve stenosis (narrowing of the valve at the beginning of the aorta), pulmonary artery hypertension and a number of other conditions.

Pathophysiology

In those who have ACS, atheroma rupture is most commonly found 60% when compared to atheroma erosion (30%), thus causes the formation of thrombus which block the coronary arteries. Plaque rupture is responsible for 60% in ST elevated myocardial infarction (STEMI) while plaque erosion is responsible for 30% of the STEMI and vice versa for Non ST elevated myocardial infarction (NSTEMI). In plaque rupture, the content of the plaque are lipid rich, collagen poor, with abundant inflammation which is macrophage predominant, and covered with a thin fibrous cap. Meanwhile, in plaque erosion, the plaque is rich with extracellular matrix, proteoglycan, glycoaminoglycan, but without fibrous caps, no inflammatory cells, and no large lipid core. After the coronary arteries are unblocked, there is a risk of reperfusion injury due spreading inflammatory mediators throughout the body. Investigations is still underway on the role of Cyclophilin D in reducing the reperfusion injury.

Other, less common, causes of acute coronary syndrome include spontaneous coronary artery dissection, ischemia in the absence of obstructive coronary artery disease (INOCA), and myocardial infarction in the absence of obstructive coronary artery disease (MINOCA).

Diagnosis

Electrocardiogram

In the setting of acute chest pain, the electrocardiogram is the investigation that most reliably distinguishes between various causes. The ECG should be done as early as practicable, including in the ambulance if possible. If this indicates acute heart damage (elevation in the ''ST segment'', new left bundle branch block), treatment for a heart attack in the form of angioplasty or thrombolysis is indicated immediately (see below). In the absence of such changes, it is not possible to immediately distinguish between unstable angina and NSTEMI.

Imaging and blood tests

As it is only one of the many potential causes of chest pain, the patient usually has a number of tests in the emergency department, such as a chest X-ray, blood tests (including myocardial markers such as troponin I or T, and H-FABP and/or a D-dimer if a pulmonary embolism is suspected), and telemetry (monitoring of the heart rhythm).

Combination of troponin levels (less than 5 ng/L) with low TIMI scores can help to predict those with low possibility of myocardial infarction and discharge them safely from the emergency department. Coronary CT angiography combined with Troponin levels is also helpful to triage those who are susceptible to ACS. F-fluoride positron emission tomography is also helpful in identifying those with high risk, lipid-rich coronary plaques.

Prediction scores

The ACI-TIPI score can be used to aid diagnosis; using seven variables from the admission record, this score predicts crudely which patients are likely to have myocardial ischemia. For example, according to a randomized controlled trial, males having chest pain with normal or non-diagnostic ECG are at higher risk for having acute coronary syndrome than women. In this study, the sensitivity was 65.2% and specificity was 44%. This particular study had an 8.4% prevalence of acute coronary syndrome, which means the positive predictive value of being a male with chest pain and having coronary syndrome is 9.6% and negative predictive value is 93.2%
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to adjust these results for people at higher or lower risk of acute coronary syndrome).
In a second cohort study, exercise electrocardiography was similarly found to be a poor predictor of acute coronary syndrome at follow-up. Of the patients who had a coronary event at 6 years of follow up, 47% had a negative ECG at the start of the study. With an average follow up of 2.21 years the receiver operating characteristic curves gave resting ECG a score of 0.72 and exercise ECG a score of 0.74.

There are not only prediction scores for diagnosis of ACS, but also prognosis. Most notably, the GRACE ACS Risk and Mortality score helps diagnose, and based upon that score predicts mortality rate of a given patient. It takes into account both clinical (blood pressure, heart rate, EKG findings) and medical history in its scoring system.

Prevention

Acute coronary syndrome often reflects a degree of damage to the coronaries by atherosclerosis. Primary prevention of atherosclerosis is controlling the risk factors: healthy eating, exercise, treatment for hypertension and diabetes, avoiding smoking and controlling cholesterol levels; in patients with significant risk factors, aspirin has been shown to reduce the risk of cardiovascular events. Secondary prevention is discussed in myocardial infarction.

After a ban on smoking in all enclosed public places was introduced in Scotland in March 2006, there was a 17% reduction in hospital admissions for acute coronary syndrome. 67% of the decrease occurred in non-smokers.

Treatment

People with presumed ACS are typically treated with aspirin, clopidogrel or ticagrelor, nitroglycerin, and if the chest discomfort persists morphine. Other analgesics such as nitrous oxide are of unknown benefit. Angiography is recommended in those who have either new ST elevation or a new left or right bundle branch block on their ECG. Unless the person has low oxygen levels additional oxygen does not appear to be useful.

STEMI

If the ECG confirms changes suggestive of myocardial infarction (ST elevations in specific leads, a new left bundle branch block or a true posterior MI pattern), thrombolytics may be administered or primary coronary angioplasty may be performed. In the former, medication is injected that stimulates fibrinolysis, destroying blood clots obstructing the coronary arteries. In the latter, a flexible catheter is passed via the femoral or radial arteries and advanced to the heart to identify blockages in the coronaries. When occlusions are found, they can be intervened upon mechanically with angioplasty and usually stent deployment if a lesion, termed the ''culprit'' lesion, is thought to be causing myocardial damage. Data suggest that rapid triage, transfer and treatment is essential. The time frame for door-to-needle thrombolytic administration according to American College of Cardiology (ACC) guidelines should be within 30 minutes, whereas the door-to-balloon Percutaneous Coronary Intervention (PCI) time should be less than 90 minutes. It was found that thrombolysis is more likely to be delivered within the established ACC guidelines among patients with STEMI as compared to PCI according to a case control study.

NSTEMI and NSTE-ACS

If the ECG does not show typical changes, the term "non-ST segment elevation ACS" is applied. The patient may still have had a "non-ST elevation MI" (NSTEMI). The accepted management of unstable angina and acute coronary syndrome is therefore empirical treatment with aspirin, a second platelet inhibitor such as clopidogrel, prasugrel or ticagrelor, and heparin (usually a low-molecular weight heparin), with intravenous nitroglycerin and opioids if the pain persists. The heparin-like drug known as fondaparinux appears to be better than enoxaparin.

A blood test is generally performed for cardiac troponins twelve hours after onset of the pain. If this is positive, coronary angiography is typically performed on an urgent basis, as this is highly predictive of a heart attack in the near-future. If the troponin is negative, a treadmill exercise test or a thallium scintigram may be requested.

If there is no evidence of ST segment elevation on the electrocardiogram, delaying urgent angioplasty until the next morning is not inferior to doing so immediately. Using statins in the first 14 days after ACS reduces the risk of further ACS.

In a cohort study comparing NSTEMI and STEMI, people with NSTEMI had a similar risk of death at one year after PCI as compared to people with STEMI (3.4% vs 4.4%). However, NSTEMI had significantly more "major cardiac events" (death, myocardial infarction, disabling stroke, or requiring revascularization) at one year (24.0% vs 16.6%).

Cocaine-associated ACS should be managed in a manner similar to other patients with acute coronary syndrome except beta blockers should not be used and benzodiazepines should be administered early.

Prognosis

TIMI score

The TIMI risk score can identify high risk patients in non-ST segment elevation MI ACS and has been independently validated.

Global Registry of Acute Coronary Events (GRACE) score

Based on a global registry of 102,341 patients, the GRACE Risk Score estimates in-hospital, 6 months, 1 year, and 3-year mortality risk after a heart attack
GRACE Score 2.0 Calculator

Killip class

The Killip classification consists of 4 classes based on clinical symptoms. It predicts 30-day mortality after myocardial infarction.

Biomarkers for diagnosis

The aim of diagnostic markers is to identify patients with ACS even when there is no evidence of heart muscle damage.
* Ischemia-Modified Albumin (IMA) – In cases of Ischemia – Albumin undergoes a conformational change and loses its ability to bind transitional metals (copper or cobalt). IMA can be used to assess the proportion of modified albumin in ischemia. Its use is limited to ruling out ischemia rather than a diagnostic test for the occurrence of ischemia.
* Myeloperoxidase (MPO) – The levels of circulating MPO, a leukocyte enzyme, elevate early after ACS and can be used as an early marker for the condition.
* Glycogen Phosphorylase Isoenzyme BB-(GPBB) is an early marker of cardiac ischemia and is one of three isoenzyme of Glycogen Phosphorylase.
* Troponin is a late cardiac marker of ACS

Biomarkers for risk determination

The aim of prognostic markers is to reflect different components of pathophysiology of ACS. For example:
* Natriuretic peptide – Both B-type natriuretic peptide (BNP) and N-terminal Pro BNP can be applied to predict the risk of death and heart failure following ACS.
* Monocyte chemo attractive protein (MCP)-1 – has been shown in a number of studies to identify patients with a higher risk of adverse outcomes after ACS.

Day of admission

Studies have shown that for ACS patients, weekend admission is associated with higher mortality and lower utilization of invasive cardiac procedures, and those who did undergo these interventions had higher rates of mortality and complications than their weekday counterparts. This data leads to the possible conclusion that access to diagnostic/interventional procedures may be contingent upon the day of admission, which may impact mortality. This phenomenon is described as weekend effect.

Valvular heart disease

Valvular heart disease is characterized by damage to or defective in one of the four heart valves: the mitral, aortic, tricuspid or pulmonary. Some types of valvular heart disease include valvular stenosis, valvular prolapse and regurgitation.

Oral manifestations

Oral infections may pose risk during postoperative period of heart valve surgery. Oral health in patients scheduled for heart valve surgery is poorer than in individuals without valve disease. Most of them experience periodontitis due to high dental plaque scores, reflecting poorer dental hygiene. This situation could favour the appearance of bacteremia following tooth brushing in these individuals. Bacteremia secondary to periodontal infection is known to be one of the primary causes of infectious endocarditis, particularly in patient with heart valve disorders. Therefore, treatment of dental disease should be done prior to performing heart surgery. Periodontal treatment is advised in patients with advanced periodontitis, followed by root planing and ultrasound treatment. Those teeth not amenable to treatment and with poor prognosis should be removed as pre-surgical preventive measures.

Dental management

The two main concerns during dental treatment for people of patient with valvular heart disease are the risk of infective endocarditis and bleeding in anti coagulated patients. Endocarditis is more likely to occur in patients who have previously had endocarditis and those with certain cardiac lesions. Risk of a normally functioning prosthesis being infected after a dental procedure is probably no higher than risk in patient with damaged native valves. However, mortality and morbidity is much higher should prosthesis become infected. Patient with native valve disease can often stop or reduce their anticoagulants, but those with prosthetic valves should not discontinue anticoagulants without cardiological advice. Mechanical mitral valves are prone to thrombosis, which cause emboli if adequate anti-coagulation is not maintained, although short term modification may be possible.

Heart failure

Heart failure (HF) is defined as the incapacity of the heart to function properly, pumping insufficient blood towards the tissues and leading to fluid accumulation within the lungs, liver and peripheral tissues.

Oral manifestations

    Most if not all patients with heart failure will be undergoing drug treatments for their condition and these drugs can produce a series of oral manifestation. In this context, angiotensin-converting enzyme (ACE) inhibitors such as captopril and enalapril can produce burning mouth sensation lichenoid reactions and a loss of taste sensation, while diuretics like furosemide can produce xerostomia.

Dental management

    Consultation with the supervising physician is highly advised in order to understand the patient's current condition and the medication prescribed. The patient should be receiving medical care, and heart failure should be compensated. Dental treatment is to be limited to patients who are in stable condition, since these people are at a high risk of developing questionable arrhythmias and even sudden death secondary to cardiopulmonary arrest. Stress and anxiety are to be avoided during the visits, which in turn should be brief (< 30 minutes) and are to be scheduled for the morning sessions. The patient should be seated on the chair in a semi-supine position, with control of body movements (which should be slow), to avoid orthostatic hypotension. In patients who has been administered with digitalis agents (digoxin, methyl-digoxin), the vasoconstrictor dose should be limited to two anaesthetic carpules, since this drug combination can cause arrhythmias. Aspirin (acetylsalicylic acid) can lead to fluid and sodium retention, and therefore should not be prescribed in patients with heart failure.

In emergency (i.e., lung edema), after contacting the emergency service, the patient should be seated with the legs lowered, and receiving nasal oxygen at a rate of 4–6 liters/minute. Sublingual nitroglycerin tablets are indicated (0.4-0.8 mg), and the dose may be repeated every 5 or 10 minutes if blood pressure is maintained.

Arrhythmia

Arrhythmias are variations in normal heart rate due to cardiac rhythm, frequency or contraction disorders. The most common type of cardiac arrhythmia is atrial fibrillation.

Oral manifestations

Many anti-arrhythmic drugs have side effects such as gingival hyperplasia or xerostomia.

Dental management

Consultation with the supervising physician is also advised in order to understand the patient's current condition and the type of arrhythmia involved, as well as the medication prescribed. It must be checked that the patient uses the medication correctly. Stress and anxiety can be reduced with anxiolytics. Short visits in the morning are to be preferred. Patient monitoring, with recording of the pulse, is indicated before treatment. It is very important to limit the use of vasoconstrictor in local anesthesia, with no more than two carpules. The treatment planned should not be too long or complicated. Although modern pacemakers are more resistant to electromagnetic interferences, caution is required when using electrical devices like ultrasound and electric scalpels that might interfere with pacemakers – especially the older models, since such devices developed in the last 30 years are bipolar and are generally not affected by the small electromagnetic fields generated by dental equipment. It is therefore important to know the type of pacemaker, the degree of electromagnetic protection of the generator, and the nature of the arrhythmia. If arrhythmia develops during dental treatment, the procedure should be suspended, oxygen is to be given, and the patient vital signs are to be assessed: body temperature (normal values: 35.5-37oC), pulse (normal values: 60-100 bpm), respiratory frequency (normal values in adults: 14-20 cycles or respirations per minute), blood pressure (normal values: systolic blood pressure under 140 mmHg and diastolic blood pressure under 90 mmHg). Sublingual nitrites are to be administered if there is chest pain. The patient should be placed in the Trendelenburg position, with vagal maneuvering where necessary (valsalva maneuver, massage in the carotid pulse and initiation of the emergency procedure for evacuation to a hospital centre, if necessary.

See also

* Allergic acute coronary syndrome (Kounis syndrome)

References

External links

{{DEFAULTSORT:Acute Coronary Syndrome
Medical emergencies
Ischemic heart diseases
Syndromes affecting the heart