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Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...
Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
A recent study found that features of POTS, such as the change in heart rate or blood pressure when going from laying down to sitting up, can affect the performance of elite swimmers. Why Ledecky ...
Orthostatic intolerance (OI) is the development of symptoms when standing upright that are relieved when reclining. [1] There are many types of orthostatic intolerance. OI can be a subcategory of dysautonomia, a disorder of the autonomic nervous system [2] occurring when an individual stands up. [3]
Research published Monday has confirmed a link between a COVID-19 infection and a debilitating heart condition called POTS, or postural orthostatic tachycardia syndrome, that has been diagnosed in ...
In a healthy heart during normal sinus rhythm, only either the fast pathway or the slow pathway is used at any given moment for conducting electrical signals through the AV node, not both simultaneously. [10] During PSVT episodes, an irregular heartbeat is triggered by an early electrical signal from one of the atria.
Most of these can be cured if the tumor can be completely removed. When a tumor is very large or there are multiple tumors, removing part of it that is not inside the heart walls can improve or eliminate symptoms. Some types can be followed with yearly echocardiograms instead of surgery if they are no longer causing symptoms.
This is complemented by gastro-coronary reflexes [12] whereby the coronary arteries constrict with "functional cardiovascular symptoms" similar to chest-pain on the left side and radiation to the left shoulder, dyspnea, sweating, up to angina pectoris-like attacks with extrasystoles, drop of blood pressure, and tachycardia (high heart rate) or ...