Heart rate: What's normal? - Mayo Clinic
2022年10月8日 · A normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute.
Tachycardia - Symptoms and causes - Mayo Clinic
2023年12月15日 · Tachycardia is an increased heart rate for any reason. If a fast heart rate is caused by exercise or stress, it's called sinus tachycardia. Sinus tachycardia is a symptom, not a condition. Most heart conditions can lead to different forms of tachycardia. Irregular heart rhythms, called arrhythmias, are one cause.
Heart conditions and pregnancy: Know the risks - Mayo Clinic
2023年8月10日 · Pregnancy makes the heart and blood vessels work harder. During pregnancy, blood volume increases by 30% to 50% to nourish the growing baby. The heart also pumps more blood each minute, and the heart rate increases. Labor and delivery add to the heart's workload too. During labor, there are sudden changes in blood flow and blood pressure ...
Heart palpitations - Symptoms & causes - Mayo Clinic
2022年3月11日 · If the heart beats rapidly, blood pressure can drop, causing the person to faint. This is more likely in those with a heart problem, such as congenital heart disease or certain valve problems. Cardiac arrest. Rarely, palpitations can be caused by life-threatening heartbeat problems and can cause the heart to stop beating effectively. Stroke.
Bradycardia - Symptoms and causes - Mayo Clinic
2022年5月7日 · Bradycardia (brad-e-KAHR-dee-uh) is a slow heart rate. The hearts of adults at rest usually beat between 60 and 100 times a minute. If you have bradycardia, your heart beats fewer than 60 times a minute. Bradycardia can be a serious problem if the heart rate is very slow and the heart can't pump enough oxygen-rich blood to the body.
Heart arrhythmia - Symptoms and causes - Mayo Clinic
2023年10月13日 · A heart-healthy lifestyle can help prevent heart damage that can trigger some heart arrhythmias. Types. In general, heart arrhythmias are grouped by the speed of the heart rate. For example: Tachycardia (tak-ih-KAHR-dee-uh) is a fast heartbeat. The heart rate is greater than 100 beats a minute. Bradycardia (brad-e-KAHR-dee-uh) is a slow heartbeat.
Ejection fraction: An important heart test - Mayo Clinic
2023年2月17日 · The heart contracts and relaxes. When the heart contracts, it pumps out — ejects — blood from the two lower heart chambers, called ventricles. When the heart relaxes, the ventricles refill with blood. No matter how forceful the contraction, the heart can never pump all the blood out of a ventricle.
Enlarged heart - Symptoms & causes - Mayo Clinic
2022年5月4日 · Heart failure. Heart failure may occur if the left lower heart chamber (left ventricle) becomes enlarged. In heart failure, the heart can't pump the proper amount of blood throughout the body. Blood clots. Blood clots may form in the lining of the heart. A blood clot that forms on the right side of the heart can travel to the lungs (pulmonary ...
Atrial fibrillation - Symptoms and causes - Mayo Clinic
2024年3月8日 · In people with AFib, the heart rate may range from 100 to 175 beats a minute. Causes of atrial fibrillation. Problems with the heart's structure are the most common cause of atrial fibrillation (AFib). Heart diseases and health problems that can cause AFib include: A heart problem you're born with, called a congenital heart defect.
Heart failure - Symptoms and causes - Mayo Clinic
2023年4月20日 · Other heart problems. Heart failure can cause changes in the heart's size and function. These changes may damage heart valves and cause irregular heartbeats. Liver damage. Heart failure can cause fluid buildup that puts too much pressure on the liver. This fluid backup can lead to scarring, which makes it more difficult for the liver to work ...