| Medical Dictionary |
A Medical Dictionary of Medical Terminology
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An arrhythmia is any disorder of your heart rate or rhythm. It means that your heart beats too quickly, too slowly, or with an irregular pattern. Most arrhythmias result from problems in the electrical system of the heart. If your arrhythmia is serious, you may need a cardiac pacemaker or an implantable cardioverter defibrillator (ICD). They are devices that are implanted in your chest or abdomen.
A pacemaker helps control abnormal heart rhythms. It uses electrical pulses to prompt the heart to beat at a normal rate. It can speed up a slow heart rhythm, control a fast heart rhythm, and coordinate the chambers of the heart.
An ICD monitors heart rhythms. If it senses dangerous rhythms, it delivers shocks. This treatment is called defibrillation. An ICD can help control life-threatening arrhythmias, especially those that can cause sudden cardiac arrest (SCA). Most new ICDs can act as both a pacemaker and a defibrillator. Many ICDs also record the heart's electrical patterns when there is an abnormal heartbeat. This can help the doctor plan future treatment.
Getting a pacemaker or ICD requires minor surgery. You usually need to stay in the hospital for a day or two, so your doctor can make sure that the device is working well. You will probably be back to your normal activities within a few days.
Sudden cardiac arrest (SCA) is a condition in which the heart suddenly stops beating. When that happens, blood stops flowing to the brain and other vital organs. If it is not treated, SCA usually causes death within minutes. But quick treatment with a defibrillator may be lifesaving.
How is sudden cardiac arrest (SCA) different from a heart attack?A heart attack is different from an SCA. A heart attack happens when blood flow to the heart is blocked. During a heart attack, the heart usually doesn't suddenly stop beating. With an SCA, the heart stops beating.
Sometimes an SCA can happen after or during recovery from a heart attack.
What causes sudden cardiac arrest (SCA)?Your heart has an electrical system that controls the rate and rhythm of your heartbeat. An SCA can happen when the heart's electrical system is not working right and causes irregular heartbeats. Irregular heartbeats are called arrhythmias. There are different types. They may cause the heart to beat too fast, too slow, or with an irregular rhythm. Some can cause the heart to stop pumping blood to the body; this is the type that causes SCA.
Certain diseases and conditions can cause the electrical problems that lead to SCA. They include:
You are at higher risk for SCA if you:
Usually, the first sign of SCA is loss of consciousness (fainting). This happens when the heart stops beating.
Some people may have a racing heartbeat or feel dizzy or light-headed just before they faint. And sometimes people have chest pain, shortness of breath, nausea, or vomiting in the hour before they have an SCA.
How is sudden cardiac arrest (SCA) diagnosed?SCA happens without warning and requires emergency treatment. Health care providers rarely diagnose SCA with medical tests as it's happening. Instead, it is usually diagnosed after it happens. Providers do this by ruling out other causes of a person's sudden collapse.
If you are at high risk for SCA, your provider may refer you to a cardiologist, a doctor who specializes in heart diseases. The cardiologist may ask you to get various heart health tests to see how well you heart is working. He or she will work with you to decide whether you need treatment to prevent SCA.
What are the treatments for sudden cardiac arrest (SCA)?SCA is an emergency. A person having SCA needs to be treated with a defibrillator right away. A defibrillator is a device sends an electric shock to the heart. The electric shock can restore a normal rhythm to a heart that's stopped beating. To work well, it needs to be done within minutes of the SCA.
Most police officers, emergency medical technicians, and other first responders are trained and equipped to use a defibrillator. Call 9-1-1 right away if someone has signs or symptoms of SCA. The sooner you call for help, the sooner lifesaving treatment can begin.
What should I do if I think that someone has had an SCA?Many public places such as schools, businesses, and airports have automated external defibrillators (AEDs). AEDs are special defibrillators that untrained people can use if they think that someone has had SCA. AEDS are programmed to give an electric shock if they detect a dangerous arrhythmia. This prevents giving a shock to someone who may have fainted but isn't having SCA.
If you see someone who you think has had SCA, you should give cardiopulmonary resuscitation (CPR) until defibrillation can be done.
People who are at risk for SCA may want to consider having an AED at home. Ask your cardiologist to help you decide whether having an AED in your home might help you.
What are the treatments after surviving sudden cardiac arrest (SCA)?If you survive SCA, you'll likely be admitted to a hospital for ongoing care and treatment. In the hospital, your medical team will closely watch your heart. They may give you medicines to try to reduce the risk of another SCA.
They will also try to find out what caused your SCA. If you're diagnosed with coronary artery disease, you may have an angioplasty or coronary artery bypass surgery. These procedures help restore blood flow through narrowed or blocked coronary arteries.
Often, people who have had SCA get a device called an implantable cardioverter defibrillator (ICD). This small device is surgically placed under the skin in your chest or abdomen. An ICD uses electric pulses or shocks to help control dangerous arrhythmias.
Can sudden cardiac arrest (SCA) be prevented?You may be able to lower your risk of SCA by following a heart-healthy lifestyle. If you have coronary artery disease or another heart disease, treating that disease can also lower your risk of SCA. If you have had an SCA, getting an implantable cardioverter defibrillator (ICD) can lower your chance of having another SCA.
NIH: National Heart, Lung, and Blood Institute
An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia. The most common type of arrhythmia is atrial fibrillation, which causes an irregular and fast heart beat.
Many factors can affect your heart's rhythm, such as having had a heart attack, smoking, congenital heart defects, and stress. Some substances or medicines may also cause arrhythmias.
Symptoms of arrhythmias include:
Your doctor can run tests to find out if you have an arrhythmia. Treatment to restore a normal heart rhythm may include medicines, an implantable cardioverter-defibrillator (ICD) or pacemaker, or sometimes surgery.
NIH: National Heart, Lung, and Blood Institute
Heart surgery can correct certain heart problems when other treatments haven't worked or can't be used.
In some cases, heart surgery may be a medical emergency. For example, surgery for a severe heart attack may need to be done right away. In other cases, you can plan heart surgery ahead of time. Some heart surgeries are major operations, such as heart bypass surgery for blocked arteries in the heart. Other surgeries are more minor heart procedures, such as putting in a pacemaker.
What conditions does heart surgery treat?There are different types of heart surgery that can help treat many heart conditions:
What conditions does heart surgery treat?What does the heart surgery do?Coronary artery disease (CAD) - when a sticky substance called plaque narrows or blocks the arteries that supply blood to your heart muscle.Makes a new path for blood to flow around the blocked part of an artery in the heart. This is called a coronary artery bypass graft (CABG), or heart bypass. It's the most common heart surgery in adults.Heart valve diseases - problems with the valves that control the flow of blood through your heart.Repairs heart valves.Replaces heart valves with a mechanical valve or a biologic valve made from pig, cow, or human heart tissue.Arrhythmia - problems with the rate or rhythm of your heartbeat. They are caused by changes in the electrical signals that control your heartbeat.Places a pacemaker or an implantable cardioverter defibrillator (ICD) in the chest to correct your heartbeat.Treats atrial fibrillation with small cuts in the heart muscle. The cuts form scars that make a path for the heart's electrical signals (Maze surgery).Heart failure - when your heart is too weak or stiff to pump enough oxygen-rich blood to meet your body's needs.Places a device in the chest which may include:The approach a surgeon uses to do heart surgery depends on your heart problem, your general health, and other factors. Approaches to heart surgery include:
Like all surgery, heart surgery has risks even though the results are often excellent. The risks include:
The risks of heart surgery tend to be higher if:
NIH: National Heart, Lung, and Blood Institute
Heart failure means that your heart can't pump enough oxygen-rich blood to meet your body's needs. Heart failure doesn't mean that your heart has stopped or is about to stop beating. But without enough blood flow, your organs may not work well, which can cause serious problems.
Heart failure can affect one or both sides of your heart:
Left-sided heart failure is more common than right-sided heart failure.
What causes heart failure?Heart failure can start suddenly after a medical condition or injury damages your heart muscle. But in most cases, heart failure develops slowly from long-term medical conditions.
Conditions that can cause heart failure include:
Over time, left-sided heart failure can lead to right-sided heart failure.
Who is more likely to develop heart failure?Heart failure can happen at any age. It happens to both men and women, but men often develop it at a younger age than women. Your chance of developing heart failure increases if:
The symptoms of heart failure depend on which side of your heart is affected and how serious your condition has become. Most symptoms are caused by reduced blood flow to your organs and fluid buildup in your body.
Fluid buildup happens because the flow of blood through your heart is too slow. As a result, blood backs up in the vessels that return the blood to your heart. Fluid may leak from the blood vessels and collect in the tissues of your body, causing swelling (edema) and other problems.
Symptoms of heart failure may include:
At first you may have no symptoms or mild symptoms. As the disease gets worse, your symptoms will usually bother you more.
What other problems does heart failure cause?Fluid buildup and reduced blood flow to your organs can lead to serious problems, including:
To find out if you have heart failure, your doctor will:
In some cases, your doctor may refer you to a cardiologist (a doctor who specializes in heart diseases) for tests, diagnosis, and care.
What are the treatments for heart failure?Your treatment will depend on the type of heart failure you have and how serious it is. There's no cure for heart failure. But treatment can help you live longer with fewer symptoms.
Even with treatment, heart failure usually gets worse over time, so you'll likely need treatment for the rest of your life.
Most treatment plans include:
You may need heart surgery if:
As part of your treatment, you'll need to pay close attention to your symptoms, because heart failure can worsen suddenly. Your provider may suggest a cardiac rehabilitation program to help you learn how to manage your condition.
Can heart failure be prevented?You may be able to prevent or delay heart failure if you:
NIH: National Heart, Lung, and Blood Institute
When someone's blood flow or breathing stops, seconds count. Permanent brain damage or death can happen quickly. If you know how to perform cardiopulmonary resuscitation (CPR), you could save a life. CPR is an emergency procedure for a person whose heart has stopped (called sudden cardiac arrest) or who is no longer breathing. CPR can maintain the blood flow breathing until emergency medical help arrives.
Take these steps if someone is in sudden cardiac arrest:
Endocarditis is sometimes called infective endocarditis. It's a rare but life-threatening inflammation of the lining inside your heart's chambers and valves (the endocardium).
Endocarditis is usually caused by germs that get into your bloodstream and travel to your heart. Once they get inside your heart, the germs can attach to the lining or get trapped in the valves. They start to grow, causing an infection. If not treated quickly, the infection can cause damage to the heart and lead to serious health problems.
What causes endocarditis?Bacterial infections cause most endocarditis. Normally, many bacteria live in your mouth, on your skin, or in other parts of the body. Sometimes the bacteria can get into your bloodstream from injuries such cuts or scrapes. Dental work and certain surgeries can also allow small amounts of bacteria to enter your bloodstream.
In some cases, fungal infections cause endocarditis. The fungi, such as yeast, can live in parts of your body. Fungal infections generally happen in people who have weakened immune systems that can't stop the fungus from growing. This includes people who have HIV.
Who is more likely to develop endocarditis?In general, endocarditis is rare. If you're healthy, your immune system usually destroys the germs in your bloodstream before they can cause harm.
But your chance of developing endocarditis may be higher than most people if you:
Endocarditis symptoms may be severe or very mild. They may start suddenly or slowly. And they can vary from person to person. The possible symptoms of endocarditis include:
When the germs are in your heart, they can clump together with blood cells. These clumps can break off and travel through your bloodstream. They may block blood flow, spread infection, or damage your organs, including your brain, lungs, kidneys, and spleen.
Endocarditis may sometimes lead to sepsis, a medical emergency that happens when your body has an extreme response to the infection.
Endocarditis can also cause serious heart problems including:
To find out if you have endocarditis, your health care provider will:
If you have endocarditis, it's important to get treatment quickly. Treatments may include:
Treatment may last weeks, and you may need tests to make sure it's working. Your provider will also check you for problems that could develop from endocarditis, such as heart failure or an irregular heartbeat.
Can endocarditis be prevented?If you have a higher chance of developing endocarditis than most people, you can reduce your risk if you:
People with the highest risk for bacterial endocarditis need antibiotics before dental visits or certain medical or surgical procedures. Ask your provider if you're part of the highest risk group. If so, let all your providers know about your risk.
NIH: National Heart, Lung, and Blood Institute
Heart disease is a general term that includes many types of heart problems. It's also called cardiovascular disease, which means heart and blood vessel disease.
Heart disease is the leading cause of death in the United States, but there are ways to prevent and manage many types of heart disease.
What are the types of heart disease?There are many different types of heart disease. Some you may be born with, called congenital heart disease. Other types develop during your lifetime.
Coronary artery disease (also called coronary heart disease) is the most common type of heart disease. It happens slowly over time when a sticky substance called plaque builds up in the arteries that supply your heart muscle with blood. The plaque narrows or blocks blood flow to the heart muscle and can lead to other heart problems:
Other types of heart diseases may affect your heart valves or heart muscle (cardiomyopathy).
What causes heart diseases?The causes of heart disease depend on the type of disease. Some possible causes include lifestyle, genetics, infections, medicines, and other diseases.
Who is more likely to develop heart diseases?There are many different factors that can make you more likely to develop heart disease. Some of these factors you can change, but others you cannot.
Your symptoms will depend on the type of heart disease you have. You may not have symptoms at first. In some cases, you may not know you have heart disease until you have a complication such as a heart attack.
How are heart diseases diagnosed?To find out if you have heart disease, your health care provider will:
In some cases, your provider may refer you to a cardiologist (a doctor who specializes in heart diseases) for tests, diagnosis, and care.
What are the treatments for heart disease?Treatment plans for heart disease depend on the type of heart disease you have, how serious your symptoms are, and what other health conditions you have. Possible treatments may include:
You may be able to lower your risk of certain heart diseases by making heart-healthy lifestyle changes and managing any other medical conditions you have.
NIH: National Heart, Lung, and Blood Institute
Sarcoidosis is a condition in which groups of cells in your immune system form small, red, and swollen (inflamed) lumps. These lumps are called granulomas. They can form in any organ in the body. But they most commonly affect the lungs and lymph nodes in the chest. Over time, sarcoidosis can cause permanent scarring of organs.
What causes sarcoidosis?Your immune system creates inflammation to help defend you against germs and sickness. But in sarcoidosis, inflammation goes off track. It causes the cells in your immune system to form granulomas. Studies suggest that this inflammation might be triggered by infections and certain substances in the environment such as insecticides and mold. And your genes may affect how your immune system reacts to a trigger.
Who is more likely to develop sarcoidosis?Anyone can develop sarcoidosis, but you are more likely to have it if you:
Many people who have sarcoidosis have no symptoms, or they may feel unwell but without any obvious symptoms. If you have symptoms, you may have some general symptoms. And you may have other symptoms, which will depend upon which part of the body is affected.
The general symptoms can include:
The symptoms of sarcoidosis in the lungs can include:
The symptoms of sarcoidosis in other parts of the body can include:
There is also a set of symptoms that are called Lofgren's syndrome. Some people have Lofgren's syndrome when they first develop sarcoidosis. It usually goes away completely within 2 years. The symptoms of Lofgren's syndrome may include:
If untreated, or if the treatment does not work, sarcoidosis can cause serious health problems called complications. Possible complications include:
There is no single test that can diagnose sarcoidosis, and its symptoms can be similar to the symptoms of many other conditions. That makes it hard to diagnose. To find out if you have sarcoidosis, your health care provider:
If you are diagnosed with sarcoidosis, your provider may order other tests to look at how sarcoidosis is affecting the body.
What are the treatments for sarcoidosis?There is no cure for sarcoidosis. The goal of treatment for sarcoidosis is remission, which means you still have the condition, but it does not cause you problems.
You may not need treatment, and sometimes the condition goes away on its own. If you do need treatment, which treatment(s) you get will depend on your symptoms, which organs are affected, and whether those organs are working well. You may be given medicines to:
If you have complications from sarcoidosis, you may need other treatments, such as other medicines, surgery, oxygen therapy, pulmonary rehabilitation, or an implanted cardiac pacemaker or defibrillator.
Whether or not you have symptoms from sarcoidosis, it's important to get regular follow-up care from your provider, make healthy lifestyle changes, and contact your provider if you have any new symptoms.
NIH: National Heart, Lung, and Blood Institute