Shekswess/llama3_medquad_instruct_dataset huggingface dataset:
Question: What causes Heart Block ?
Answer: Heart block has many causes. Some people are born with the disorder (congenital), while others develop it during their lifetimes (acquired).
                
Congenital Heart Block
                
One form of congenital heart block occurs in babies whose mothers have autoimmune diseases, such as lupus. People who have these diseases make proteins called antibodies that attack and damage the body's tissues or cells.
                
In pregnant women, antibodies can cross the placenta. (The placenta is the organ that attaches the umbilical cord to the mother's womb.) These proteins can damage the baby's heart and lead to congenital heart block.
                
Congenital heart defects also may cause congenital heart block. These defects are problems with the heart's structure that are present at birth. Often, doctors don't know what causes these defects.
                
Acquired Heart Block
                
Many factors can cause acquired heart block. Examples include:
                
Damage to the heart from a heart attack. This is the most common cause of acquired heart block.
                
Coronary heart disease, also called coronary artery disease.
                
Myocarditis (MI-o-kar-DI-tis), or inflammation of the heart muscle.
                
Heart failure.
                
Rheumatic (roo-MAT-ik) fever.
                
Cardiomyopathy (KAR-de-o-mi-OP-a-the), or heart muscle diseases.
                
Other diseases may increase the risk of heart block. Examples include sarcoidosis (sar-koy-DOE-sis) and the degenerative muscle disorders Lev's disease and Lenegre's disease.
                
Certain types of surgery also may damage the heart's electrical system and lead to heart block.
                
Exposure to toxic substances and taking certain medicinesincluding digitalis, beta blockers, and calcium channel blockersalso may cause heart block. Doctors closely watch people who are taking these medicines for signs of problems.
                
Some types of heart block have been linked to genetic mutations (changes in the genes).
                
An overly active vagus nerve also can cause heart block. You have one vagus nerve on each side of your body. These nerves run from your brain stem all the way to your abdomen. Activity in the vagus nerve slows the heart rate.
                
In some cases, acquired heart block may go away if the factor causing it is treated or resolved. For example, heart block that occurs after a heart attack or surgery may go away during recovery.
                
Also, if a medicine is causing heart block, the disorder may go away if the medicine is stopped or the dosage is lowered. Always talk with your doctor before you change the way you take your medicines.
Question: Who is at risk for Heart Block? ?
Answer: The risk factors for congenital and acquired heart block are different.
                
Congenital Heart Block
                
If a pregnant woman has an autoimmune disease, such as lupus, her fetus is at risk for heart block.
                
Autoimmune diseases can cause the body to make proteins called antibodies that can cross the placenta. (The placenta is the organ that attaches the umbilical cord to the mother's womb.) These antibodies may damage the baby's heart and lead to congenital heart block.
                
Congenital heart defects also can cause heart block. These defects are problems with the heart's structure that are present at birth. Most of the time, doctors don't know what causes congenital heart defects.
                
Heredity may play a role in certain heart defects. For example, a parent who has a congenital heart defect might be more likely than other people to have a child with the condition.
                
Acquired Heart Block
                
Acquired heart block can occur in people of any age. However, most types of the condition are more common in older people. This is because many of the risk factors are more common in older people.
                
People who have a history of heart disease or heart attacks are at increased risk for heart block. Examples of heart disease that can lead to heart block include heart failure, coronary heart disease, and cardiomyopathy (heart muscle diseases).
                
Other diseases also may raise the risk of heart block, such as sarcoidosis and the degenerative muscle disorders Lev's disease and Lenegre's disease.
                
Exposure to toxic substances or taking certain medicines, such as digitalis, also can raise your risk for heart block.
                
Well-trained athletes and young people are at higher risk for first-degree heart block caused by an overly active vagus nerve. You have one vagus nerve on each side of your body. These nerves run from your brain stem all the way to your abdomen. Activity in the vagus nerve slows the heart rate.
Question: What are the symptoms of Heart Block ?
Answer: Signs and symptoms depend on the type of heart block you have. First-degree heart block may not cause any symptoms.
                
Signs and symptoms of second- and third-degree heart block include:
                
Fainting
                
Dizziness or light-headedness
                
Fatigue (tiredness)
                
Shortness of breath
                
Chest pain
                
These symptoms may suggest other health problems as well. If these symptoms are new or severe, call 911 or have someone drive you to the hospital emergency room. If you have milder symptoms, talk with your doctor right away to find out whether you need prompt treatment.
Question: What are the treatments for Heart Block ?
Answer: Treatment depends on the type of heart block you have. If you have first-degree heart block, you may not need treatment.
                
If you have second-degree heart block, you may need a pacemaker. A pacemaker is a small device that's placed under the skin of your chest or abdomen. This device uses electrical pulses to prompt the heart to beat at a normal rate.
                
If you have third-degree heart block, you will need a pacemaker. In an emergency, a temporary pacemaker might be used until you can get a long-term device. Most people who have third-degree heart block need pacemakers for the rest of their lives.
                
Some people who have third-degree congenital heart block don't need pacemakers for many years. Others may need pacemakers at a young age or during infancy.
                
If a pregnant woman has an autoimmune disease, such as lupus, her fetus is at risk for heart block. If heart block is detected in a fetus, the mother might be given medicine to reduce the fetus' risk of developing serious heart block.
                
Sometimes acquired heart block goes away if the factor causing it is treated or resolved. For example, heart block that occurs after a heart attack or surgery may go away during recovery.
                
Also, if a medicine is causing heart block, the condition may go away if the medicine is stopped or the dosage is lowered. (Always talk with your doctor before you change the way you take your medicines.)
Question: What is (are) Carotid Artery Disease ?
Answer: Carotid artery disease is a disease in which a waxy substance called plaque builds up inside the carotid arteries. You have two common carotid arteries, one on each side of your neck. They each divide into internal and external carotid arteries.
                
The internal carotid arteries supply oxygen-rich blood to your brain. The external carotid arteries supply oxygen-rich blood to your face, scalp, and neck.
                
Carotid Arteries
                

                
Carotid artery disease is serious because it can cause a stroke, also called a brain attack. A stroke occurs if blood flow to your brain is cut off.
                
If blood flow is cut off for more than a few minutes, the cells in your brain start to die. This impairs the parts of the body that the brain cells control. A stroke can cause lasting brain damage; long-term disability, such as vision or speech problems or paralysis (an inability to move); or death.
                
Overview
                
Carotid artery disease is a major cause of stroke in the United States. Over time, plaque hardens and narrows the arteries. This may limit the flow of oxygen-rich blood to your organs and other parts of your body.
                
Atherosclerosis can affect any artery in the body. For example, if plaque builds up in the coronary (heart) arteries, a heart attack can occur. If plaque builds up in the carotid arteries, a stroke can occur.
                
A stroke also can occur if blood clots form in the carotid arteries. This can happen if the plaque in an artery cracks or ruptures. Blood cell fragments called platelets (PLATE-lets) stick to the site of the injury and may clump together to form blood clots. Blood clots can partly or fully block a carotid artery.
                
A piece of plaque or a blood clot also can break away from the wall of the carotid artery. The plaque or clot can travel through the bloodstream and get stuck in one of the brain's smaller arteries. This can block blood flow in the artery and cause a stroke.
                
Carotid artery disease may not cause signs or symptoms until the carotid arteries are severely narrowed or blocked. For some people, a stroke is the first sign of the disease.
                
Outlook
                
Carotid artery disease is a major cause of stroke in the United States. Other conditions, such as certain heart problems and bleeding in the brain, also can cause strokes.Lifestyle changes, medicines, and medical procedures can help prevent or treat carotid artery disease and may reduce the risk of stroke.
                
If you think you're having a stroke, you need urgent treatment. Call 911 right away if you have symptoms of a stroke. Do not drive yourself to the hospital.You have the best chance for full recovery if treatment to open a blocked artery is given within 4 hours of symptom onset. The sooner treatment occurs, the better your chances of recovery.
Question: What causes Carotid Artery Disease ?
Answer: Carotid artery disease seems to start when damage occurs to the inner layers of the carotid arteries. Major factors that contribute to damage include:
                
Smoking
                
High levels of certain fats and cholesterol in the blood
                
High blood pressure
                
High levels of sugar in the blood due to insulin resistance or diabetes
                
When damage occurs, your body starts a healing process. The healing may cause plaque to build up where the arteries are damaged.
                
The plaque in an artery can crack or rupture. If this happens, blood cell fragments called platelets will stick to the site of the injury and may clump together to form blood clots. 
                
The buildup of plaque or blood clots can severely narrow or block the carotid arteries. This limits the flow of oxygen-rich blood to your brain, which can cause a stroke.
Question: Who is at risk for Carotid Artery Disease? ?
Answer: The major risk factors for carotid artery disease, listed below, also are the major risk factors for coronary heart disease (also called coronary artery disease) and peripheral artery disease.
                
Diabetes. With this disease, the bodys blood sugar level is too high because the body doesnt make enough insulin or doesnt use its insulin properly. People who have diabetes are four times more likely to have carotid artery disease than are people who dont have diabetes.
                
Family history of atherosclerosis. People who have a family history of atherosclerosis are more likely to develop carotid artery disease.
                
High blood pressure (Hypertension). Blood pressure is considered high if it stays at or above 140/90 mmHg over time. If you have diabetes or chronic kidney disease, high blood pressure is defined as 130/80 mmHg or higher. (The mmHg is millimeters of mercurythe units used to measure blood pressure.)
                
Lack of physical activity.Too much sitting (sedentary lifestyle) and a lack of aerobic activity can worsen other risk factors for carotid artery disease, such as unhealthy blood cholesterol levels, high blood pressure, diabetes, and overweight or obesity.
                
Metabolic syndrome. Metabolic syndrome is the name for a group of risk factors that raise your risk for stroke and other health problems, such as diabetes and heart disease. The five metabolic risk factors are a large waistline (abdominal obesity), a high triglyceride level (a type of fat found in the blood), a low HDL cholesterol level, high blood pressure, and high blood sugar. Metabolic syndrome is diagnosed if you have at least three of these metabolic risk factors.
                
Older age. As you age, your risk for atherosclerosis increases. The process of atherosclerosis begins in youth and typically progresses over many decades before diseases develop.
                
Overweight or obesity. The terms overweight and obesity refer to body weight thats greater than what is considered healthy for a certain height.
                
Smoking. Smoking can damage and tighten blood vessels, lead to unhealthy cholesterol levels, and raise blood pressure. Smoking also can limit how much oxygen reaches the bodys tissues.
                
Unhealthy blood cholesterol levels. This includes high LDL (bad) cholesterol) and low HDL (good) cholesterol.
                
Unhealthy diet. An unhealthy diet can raise your risk for carotid artery disease. Foods that are high in saturated and trans fats, cholesterol, sodium, and sugar can worsen other risk factors for carotid artery disease.
                
Having any of these risk factors does not guarantee that youll develop carotid artery disease. However, if you know that you have one or more risk factors, you can take steps to help prevent or delay the disease.
                
If you have plaque buildup in your carotid arteries, you also may have plaque buildup in other arteries. People who have carotid artery disease also are at increased risk for coronary heartdisease.
Question: What are the symptoms of Carotid Artery Disease ?
Answer: Carotid artery disease may not cause signs or symptoms until it severely narrows or blocks a carotid artery. Signs and symptoms may include a bruit, a transient ischemic attack(TIA), or a stroke.
                
Bruit
                
During a physical exam, your doctor may listen to your carotid arteries with a stethoscope. He or she may hear a whooshing sound called a bruit. This sound may suggest changed or reduced blood flow due to plaque buildup. To find out more, your doctor may recommend tests.
                
Not all people who have carotid artery disease have bruits.
                
Transient Ischemic Attack (Mini-Stroke)
                
For some people, having a transient ischemic attack (TIA), or mini-stroke, is the first sign of carotid artery disease. During a mini-stroke, you may have some or all of the symptoms of a stroke. However, the symptoms usually go away on their own within 24 hours.
                
Stroke and mini-stroke symptoms may include:
                
A sudden, severe headache with no known cause
                
Dizziness or loss of balance
                
Inability to move one or more of your limbs
                
Sudden trouble seeing in one or both eyes
                
Sudden weakness or numbness in the face or limbs, often on just one side of the body
                
Trouble speaking or understanding speech
                
Even if the symptoms stop quickly, call 911 for emergency help. Do not drive yourself to the hospital. Its important to get checked and to get treatment started as soon as possible.
                
A mini-stroke is a warning sign that youre at high risk of having a stroke. You shouldnt ignore these symptoms. Getting medical care can help find possible causes of a mini-stroke and help you manage risk factors. These actions might prevent a future stroke.
                
Although a mini-stroke may warn of a stroke, it doesnt predict when a stroke will happen. A stroke may occur days, weeks, or even months after a mini-stroke.
                
Stroke
                
The symptoms of a stroke are the same as those of a mini-stroke, but the results are not. A stroke can cause lasting brain damage; long-term disability, such as vision or speech problems or paralysis (an inability to move); or death. Most people who have strokes have not previously had warning mini-strokes.
                
Getting treatment for a stroke right away is very important. You have the best chance for full recovery if treatment to open a blocked artery is given within 4 hours of symptom onset. The sooner treatment occurs, the better your chances of recovery.
                
Call 911 for emergency help as soon as symptoms occur. Do not drive yourself to the hospital. Its very important to get checked and to get treatment started as soon as possible.
                
Make those close to you aware of stroke symptoms and the need for urgent action. Learning the signs and symptoms of a stroke will allow you to help yourself or someone close to you lower the risk of brain damage or death due to a stroke.
Question: How to diagnose Carotid Artery Disease ?
Answer: Your doctor will diagnose carotid artery disease based on your medical history, a physical exam, and test results.
                
Medical History
                
Your doctor will find out whether you have any of the major risk factors for carotid artery disease. He or she also will ask whether you've had any signs or symptoms of a mini-stroke or stroke.
                
Physical Exam
                
To check your carotid arteries, your doctor will listen to them with a stethoscope. He or she will listen for a whooshing sound called a bruit. This sound may indicate changed or reduced blood flow due to plaque buildup. To find out more, your doctor may recommend tests.
                
Diagnostic Tests
                
The following tests are common for diagnosing carotid artery disease. If you have symptoms of a mini-stroke or stroke, your doctor may use other tests as well.
                
Carotid Ultrasound
                
Carotid ultrasound (also called sonography) is the most common test for diagnosing carotid artery disease. It's a painless, harmless test that uses sound waves to create pictures of the insides of your carotid arteries. This test can show whether plaque has narrowed your carotid arteries and how narrow they are.
                
A standard carotid ultrasound shows the structure of your carotid arteries. A Doppler carotid ultrasound shows how blood moves through your carotid arteries.
                
Carotid Angiography
                
Carotid angiography (an-jee-OG-ra-fee) is a special type of x ray. This test may be used if the ultrasound results are unclear or don't give your doctor enough information.
                
For this test, your doctor will inject a substance (called contrast dye) into a vein, most often in your leg. The dye travels to your carotid arteries and highlights them on x-ray pictures.
                
Magnetic Resonance Angiography
                
Magnetic resonance angiography (MRA) uses a large magnet and radio waves to take pictures of your carotid arteries. Your doctor can see these pictures on a computer screen.
                
For this test, your doctor may give you contrast dye to highlight your carotid arteries on the pictures.
                
Computed Tomography Angiography
                
Computed tomography (to-MOG-rah-fee) angiography, or CT angiography, takes x-ray pictures of the body from many angles. A computer combines the pictures into two- and three-dimensional images.
                
For this test, your doctor may give you contrast dye to highlight your carotid arteries on the pictures.
Question: How to prevent Carotid Artery Disease ?
Answer: Taking action to control your risk factors can help prevent or delay carotid artery disease and stroke. Your risk for carotid artery disease increases with the number of risk factors you have.
                
One step you can take is to adopt a heart-healthy lifestyle, which can include:
                
Heart-Healthy Eating. Following heart-healthy eating is an important part of a healthy lifestyle. Dietary Approaches to Stop Hypertension (DASH)is a program that promotes heart-healthy eating.
                
Maintaining a Healthy Weight. If youre overweight or obese, work with your doctor to create a reasonable plan for weight loss. Controlling your weight helps you control risk factors for carotid arterydisease.
                
Physical Activity. Be as physically active as you can. Physical activity can improve your fitness level and your health. Ask your doctor what types and amounts of activity are safe for you. Read more about Physical Activity and Your Heart.
                
Quit Smoking. If you smoke, quit. Talk with your doctor about programs and products that can help you quit.
                
Other steps that can prevent or delay carotid artery disease include knowing your family history of carotid artery disease. If you or someone in your family has carotid artery disease, be sure to tell your doctor.
                
If lifestyle changes arent enough, your doctor may prescribe medicines to control your carotid artery disease risk factors. Take all of your medicines as your doctor advises.
Question: What is (are) Sudden Cardiac Arrest ?
Answer: Sudden cardiac arrest (SCA) is a condition in which the heart suddenly and unexpectedly stops beating. If this happens, blood stops flowing to the brain and other vital organs.
                
SCA usually causes death if it's not treated within minutes.
                
Overview
                
To understand SCA, it helps to understand how the heart works. The heart has an electrical system that controls the rate and rhythm of the heartbeat. Problems with the heart's electrical system can cause irregular heartbeats called arrhythmias.
                
There are many types of arrhythmias. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm. Some arrhythmias can cause the heart to stop pumping blood to the bodythese arrhythmias cause SCA.
                
SCA is not the same as a heart attack. A heart attack occurs if blood flow to part of the heart muscle is blocked. During a heart attack, the heart usually doesn't suddenly stop beating. SCA, however, may happen after or during recovery from a heart attack.
                
People who have heart disease are at higher risk for SCA. However, SCA can happen in people who appear healthy and have no known heart disease or other risk factors for SCA.
                
Outlook
                
Most people who have SCA die from itoften within minutes. Rapid treatment of SCA with a defibrillator can be lifesaving. A defibrillator is a device that sends an electric shock to the heart to try to restore its normal rhythm.
                
Automated external defibrillators (AEDs) can be used by bystanders to save the lives of people who are having SCA. These portable devices often are found in public places, such as shopping malls, golf courses, businesses, airports, airplanes, casinos, convention centers, hotels, sports venues, and schools.