The heart muscle needs a constant supply of oxygen-rich blood. The coronary arteries Blood Supply of the Heart The heart and blood vessels constitute the cardiovascular (circulatory) system. The heart pumps the blood to the lungs so it can pick up oxygen and then pumps oxygen-rich blood to the body.... read more , which branch off the aorta just after it leaves the heart, deliver this blood. Coronary artery disease Overview of Coronary Artery Disease (CAD) Coronary artery disease is a condition in which the blood supply to the heart muscle is partially or completely blocked. The heart muscle needs a constant supply of oxygen-rich blood. The coronary... read more that narrows one or more of these arteries can block blood flow, causing chest pain Angina Angina is temporary chest pain or a sensation of pressure that occurs while the heart muscle is not receiving enough oxygen. A person with angina usually has discomfort or pressure beneath the... read more (angina) or an acute coronary syndrome Acute Coronary Syndromes (Heart Attack; Myocardial Infarction; Unstable Angina) Acute coronary syndromes result from a sudden blockage in a coronary artery. This blockage causes unstable angina or heart attack (myocardial infarction), depending on the location and amount... read more (see also Overview of Coronary Artery Disease Overview of Coronary Artery Disease (CAD) Coronary artery disease is a condition in which the blood supply to the heart muscle is partially or completely blocked. The heart muscle needs a constant supply of oxygen-rich blood. The coronary... read more ).
In an acute coronary syndrome, sudden blockage in a coronary artery greatly reduces or cuts off the blood supply to an area of the heart muscle (myocardium). The lack of blood supply to any tissue is termed ischemia. If the supply is greatly reduced or cut off for more than a few minutes, heart tissue dies. A heart attack, also termed myocardial infarction (MI), is death of heart tissue due to ischemia.
There are many different reasons doctors give drugs to people with coronary artery disease:
To relieve chest pain by reducing the heart's workload and widening arteries (nitrates)
To prevent angina and acute coronary symptoms from occurring (beta-blockers, calcium channel blockers, and sometimes ranolazine)
To prevent and reverse coronary artery narrowing from atherosclerosis (angiotensin-converting enzyme [ACE] inhibitors, angiotensin II receptor blockers [ARBs], statins, and antiplatelet drugs)
To open a blocked artery (clot-dissolving drugs, anticoagulants)
Most people are given nitroglycerin, which relieves pain by lowering blood pressure, which reduces the workload of the heart, and possibly by dilating arteries. Usually, it is first given under the tongue, then intravenously.
Most people who have had a heart attack are experiencing severe discomfort and anxiety. Morphine has a calming effect and reduces the workload of the heart. It is given when nitroglycerin cannot be used or is not effective; however, recent data suggest it may interact with antiplatelet drugs Antiplatelet drugs The heart muscle needs a constant supply of oxygen-rich blood. The coronary arteries, which branch off the aorta just after it leaves the heart, deliver this blood. Coronary artery disease that... read more and reduce their effectiveness and may increase the risk of death.
Because decreasing the heart’s workload also helps limit tissue damage, a beta-blocker is usually given to slow the heart rate. Slowing the rate enables the heart to work less hard and reduces the area of damaged tissue.
Calcium channel blockers
Calcium channel blockers prevent blood vessels from narrowing (constricting) and can counter coronary artery spasm. All calcium channel blockers reduce blood pressure. Some of these drugs, such as verapamil and diltiazem, may also reduce the heart rate. This effect can be useful to many people, especially those who cannot take beta-blockers or who do not get enough relief from nitrates.
Ranolazine is a drug used to treat angina in people who continue to have symptoms despite taking all other antianginal therapy. It may be more effective in women than in men.
Angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers
Angiotensin-converting enzyme Angiotensin-converting enzyme inhibitors High blood pressure is very common. It often does not cause symptoms; however, high blood pressure can increase the risk of stroke, heart attacks, and heart failure. Therefore, it is important... read more (ACE) inhibitors and angiotensin II receptor blockers Angiotensin II receptor blockers High blood pressure is very common. It often does not cause symptoms; however, high blood pressure can increase the risk of stroke, heart attacks, and heart failure. Therefore, it is important... read more (ARBs) can reduce heart enlargement and increase the chance of survival for many people. Therefore, these drugs are usually given in the first few days after a heart attack and prescribed indefinitely.
Statins Treatment Dyslipidemia is a high level of lipids (cholesterol, triglycerides, or both) or a low high-density lipoprotein (HDL) cholesterol level. Lifestyle, genetics, disorders (such as low thyroid hormone... read more have long been used to help prevent coronary artery disease, but doctors have recently found that they also have short-term benefit for people with an acute coronary syndrome. Doctors give a statin to people who are not already taking one.
People who think they may be having a heart attack should chew an aspirin tablet immediately after calling an ambulance. If aspirin is not taken at home or given by emergency personnel, it is immediately given at the hospital. This therapy improves the chances of survival by reducing the size of the clot (if present) in the coronary artery. People may also be given other types of antiplatelet drugs such as clopidogrel, ticlopidine, or ticagrelor taken by mouth, or glycoprotein IIb/IIIa inhibitors given by vein (intravenously).
Clot-dissolving drugs (thrombolytic drugs) are given intravenously to open the arteries if percutaneous coronary interventions Opening the arteries Acute coronary syndromes result from a sudden blockage in a coronary artery. This blockage causes unstable angina or heart attack (myocardial infarction), depending on the location and amount... read more cannot be done within 90 minutes after the person arrives at the hospital.
Most people are also given an anticoagulant drug, such as heparin, to help prevent the formation of additional blood clots.
Often, oxygen is given through nasal prongs or a face mask. Providing more oxygen to the heart helps keep heart tissue damage to a minimum.
Drugs Mentioned In This Article
|Generic Name||Select Brand Names|
|DURAMORPH PF, MS CONTIN|
|CARDIZEM, CARTIA XT|
|No US brand name|
|No US brand name|