2022年4月30日 · Tachycardia-bradycardia syndrome. The heart rate alternates between unusually slow and fast rhythms, often with a long pause between heartbeats.

2018年11月20日 · If you have sick sinus syndrome, your sinus node isn't functioning properly, causing your heart rate to be too slow (bradycardia), too fast (tachycardia) or irregular. Types of sick sinus syndrome and their causes include: Sinoatrial block. Electrical signals move too slowly through the sinus node, causing an abnormally slow heart rate. Sinus ...

2024年12月13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.

2022年4月30日 · To diagnose sick sinus syndrome, a health care provider performs a physical exam and asks about symptoms and medical history. Symptoms of sick sinus syndrome — such as dizziness, shortness of breath and fainting — only occur when the heart is beating irregularly.

2023年12月15日 · Tachycardia may not cause any symptoms or complications. But sometimes it's a warning of a medical condition that needs attention. Some forms of tachycardia can lead to serious health problems if left untreated. Such problems may include heart failure, stroke or sudden cardiac death.

2023年10月13日 · A heart rate below 60 beats a minute is considered bradycardia. But a low resting heart rate doesn't always mean there's a problem. If you're physically fit, your heart may be able to pump enough blood to the body with less than 60 beats a minute.

2023年12月15日 · The goals of tachycardia treatment are to slow a rapid heartbeat and to prevent future episodes of a fast heart rate. If another health condition is causing tachycardia, treating the underlying problem may reduce or prevent episodes of a fast heartbeat.

2017年3月18日 · In postural tachycardia syndrome, the nerves that regulate blood flow are out of balance, so enough blood doesn’t go to the right place at the right time. The result is a variety of symptoms, including an overly rapid heartbeat when shifting from lying down to standing up.

2020年2月27日 · Bradycardia (brad-e-KAHR-dee-uh). This refers to a slow heartbeat — a resting heart rate less than 60 beats a minute. Not all tachycardias or bradycardias mean you have heart disease.

2023年12月13日 · Mayo Clinic doctors and scientists are studying ways to improve diagnosis and treatment of heart arrhythmias, including WPW syndrome. The Heart Rhythm Disease Program in the Cardiovascular Research Center focuses on several areas related to irregular heartbeats, called cardiac arrhythmias.