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Angina is a clinical condition of ischemic heart disease, which can cause an inflammatory response in the intracardiac region. While angina itself does not directly cause muscle tissue necrosis, it can lead to myocardial infarction (MI) or muscle necrosis under certain conditions. Prinzmetal's angina, for instance, is a rare form of angina caused by primary coronary vasospasm, which can contribute to acute plaque change and MI. Unstable angina, on the other hand, is caused by a rupture in the atherosclerotic plaque of an epicardial coronary artery, resulting in impaired blood flow and inadequate oxygen supply to the myocardium. Depending on the severity and duration of ischemia, unstable angina may or may not lead to necrosis of myocardial tissue and MI.
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What You'll Learn
Unstable angina and myocardial necrosis
Angina is a type of chest pain that can be indicative of a lack of blood supply to the heart muscle. Unstable angina occurs while at rest or sleeping and can be a precursor to a heart attack. It is caused by the disruption of intraluminal plaque, which leads to the formation of a nonocclusive thrombus.
Myocardial necrosis is the death of myocardial tissue, which is often a result of cardiac arrhythmias following a diffuse central nervous system injury. Myocardial infarction (MI), commonly known as a heart attack, occurs when an area of the heart muscle is damaged or dies due to a blocked blood supply.
Systemic inflammation in unstable angina has been found to be the result of low-grade myocardial necrosis. This inflammation is caused by elevated levels of proinflammatory cytokines, including interleukin-6, interleukin-1β, tumor necrosis factor-α, C-reactive protein, and interleukin-17. These elevated levels suggest that the inflammatory process is activated in unstable angina.
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Ludwig's angina and cervicofacial necrotizing fasciitis
Angina is a common type of chest pain. While I could not find explicit information on whether angina causes muscle tissue to die (necrosis), I did find information on two related conditions: Ludwig's angina and cervicofacial necrotizing fasciitis.
Ludwig's angina is a severe and potentially fatal form of cellulitis (soft tissue infection) that occurs in the mouth and neck regions. It is characterised by a rapid onset of inflammation and swelling that can lead to airway obstruction and respiratory distress. The condition typically begins with an odontogenic (dental) infection that spreads to the submandibular, sublingual, and submental spaces, often from a lower molar tooth. It is considered an emergency and requires prompt recognition and treatment due to the high risk of airway compromise and associated morbidity and mortality.
Cervicofacial necrotizing fasciitis is a rare complication that can arise from Ludwig's angina. It is characterised by the necrosis of fascia and the overlying skin in the cervicofacial region. The progression from Ludwig's angina to cervicofacial necrotizing fasciitis is associated with extreme systemic toxicity and a rapid spread of infection through the fascial spaces. The immune status of the patient is a critical factor in the development and prognosis of cervicofacial necrotizing fasciitis, with immunocompromised individuals being more susceptible.
The successful management of Ludwig's angina and cervicofacial necrotizing fasciitis requires early and aggressive intervention. Antibiotic therapy and surgical debridement of necrotic tissue may be employed. However, as illustrated in a case report, delayed treatment can lead to fatal outcomes, emphasising the importance of timely and appropriate medical care.
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Angina caused by atherosclerosis
Angina is a common symptom of heart disease, which occurs when the heart does not receive enough blood flow and oxygen. Unstable angina can be a warning sign of an imminent heart attack and requires immediate medical attention. Atherosclerosis is a condition that leads to heart disease and is caused by the buildup of sticky cholesterol plaque, known as fatty plaque, in the arteries. This buildup often begins during childhood and worsens with age, and it can affect almost any artery in the body, including those in the heart, brain, arms, legs, pelvis, and kidneys.
When atherosclerosis affects the arteries in the heart, it is known as coronary artery disease (CAD). The buildup of plaque in the coronary arteries can lead to a decrease in blood flow, resulting in symptoms like angina. In some cases, the plaque may burst, leading to the formation of blood clots that can block the artery or travel to other parts of the body. These blockages can cause heart attacks, strokes, vascular dementia, erectile dysfunction, heart failure, or limb loss.
As atherosclerosis progresses and the arteries become more narrowed and constricted, the surrounding tissue may not receive enough oxygen, leading to muscle pain or cramps. In some cases, nearby blood vessels may expand to compensate, a phenomenon known as collateral circulation. This collateral circulation can help protect against heart attacks by delivering blood to the heart. However, if the blood supply is not restored quickly enough, the heart muscle can suffer injury and eventually die, leading to myocardial necrosis.
Myocardial necrosis, or heart muscle necrosis, is the degeneration and death of myocardial tissue, which can result from cardiac arrhythmias following a diffuse central nervous system injury. It is characterized by poorly defined areas of necrosis and is typically followed by leukocytic invasion, inflammatory cell infiltration, and phagocytosis of sarcoplasmic debris. The residual effects of myocardial necrosis can include fibroblast proliferation and collagen deposition, leading to the formation of scar tissue.
To diagnose and treat angina caused by atherosclerosis, medical professionals may perform physical examinations, blood tests, and various imaging tests such as electrocardiograms (ECG) and echocardiograms. Treatment options can include medications such as blood thinners (e.g., aspirin, clopidogrel), procedures such as angioplasty and stenting to open blocked arteries, and in some cases, heart bypass surgery. Lifestyle changes are also important in preventing and managing atherosclerosis and its complications, such as angina.
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Angina caused by abnormal heart rhythms
Angina is a type of chest pain that occurs when the heart muscle doesn't receive enough oxygen-rich blood. This happens due to plaque blockages and usually a blood clot in one or more of the arteries that feed the heart (coronary arteries). Unstable angina can lead to a heart attack and should be treated as a medical emergency.
Unstable angina can cause abnormal heart rhythms or arrhythmia. Heart muscle necrosis, or myocardial necrosis, is the degeneration and death of myocardial tissue, which is often the result of cardiac arrhythmias following a diffuse central nervous system injury. The death of myocardial tissue can be detected by observing CK-MM3 and CK-MB2 isoforms, which are quickly released into the plasma and converted to CK-MM2 and CK-MB1, respectively. CK-MM3 and CK-MB2 are isoforms of CK-MM and CK-MB, which are isoenzymes of CK, an enzyme found in virtually all body tissues. CK levels can rise due to a broad spectrum of pathologic conditions, even without myocardial necrosis.
In the case of necrosis caused by abnormal heart rhythms, the passage of calcium through damaged, abnormally permeable plasma membranes can lead to hypercontraction. This occurs when severely ischemic tissue is reperfused with arterial blood or when necrosis is caused by factors unrelated to reduced coronary blood flow. This can result in necrosis with contraction bands, which is seen in many forms of cardiac toxic injury.
Following myocardial necrosis, there is generally leukocytic invasion and phagocytosis of sarcoplasmic debris, leading to the persistence of sarcolemmal "tubes" surrounded by condensed interstitial stroma and vessels. In severe cases, there may be fibroblast proliferation and collagen deposition, forming scar tissue. This scar tissue does not contract or pump as well as healthy muscle tissue, impacting the heart's ability to pump blood.
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Microvascular angina
Angina is a common type of chest pain. Microvascular angina is a type of angina that is caused by problems with the smallest arteries of the heart, which play a crucial role in regulating blood supply to the heart. It is also known as cardiac syndrome X (CSX).
The condition is underdiagnosed due to a lack of awareness and the fact that abnormalities in the coronary microvessels are difficult to detect. An angiogram, for example, may not reveal any issues, leading doctors to tell patients that there is nothing wrong with their heart. However, tests such as MRI, stress echocardiography, and acetylcholine provocation during angiography can aid diagnosis.
Women, especially around or after menopause, are more likely than men to experience microvascular angina. This may be due to the connection between reduced oestrogen levels and the development of abnormalities in the microvessels. Oestrogen also affects how the brain perceives pain, and lower oestrogen levels are associated with a lower pain threshold.
Treatment for microvascular angina varies depending on the underlying cause but is effective in a large proportion of cases. Medications such as calcium channel blockers, nitrates, beta-blockers, and ranolazine may be used to manage symptoms and improve blood vessel function. Lifestyle changes, such as quitting smoking, are also recommended.
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Frequently asked questions
Angina is chest pain or pressure, usually caused by insufficient blood flow to the heart muscle. It is most commonly a symptom of coronary artery disease.
Unstable angina is a clinical syndrome characterised by myocardial ischemia without detectable myocardial necrosis. It is considered an acute coronary syndrome and is distinct from stable angina.
Unstable angina is associated with systemic inflammation, which can be the result of low-grade myocardial necrosis. However, in unstable angina, there is no detectable myocardial necrosis, meaning cardiac biomarkers of necrosis are not released into the circulation. Therefore, while there may be a link between angina and necrosis in some cases, it is not a direct cause-and-effect relationship.
Ludwig's angina is a rare condition that can lead to cervicofacial necrotizing fasciitis, causing necrosis of the fascia, muscle, gland tissue, and bone. It is typically managed with antibiotic therapy, and surgical intervention is only required in nonresponsive cases.
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