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Arrhythmias, also known as cardiac arrhythmias, are irregularities in the heartbeat, including when it is too fast or too slow. [2] A resting heart rate that is too fast – above 100 beats per minute in adults – is called tachycardia, and a resting heart rate that is too slow – below 60 beats per minute – is called bradycardia. [2]
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. [1] In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. [1] Heart rates above the resting rate may be normal (such as with exercise) or abnormal (such as with electrical problems within the heart).
Heart arrhythmias refer to problems involving the heart rate or heart rhythm that result from abnormal electrical activity in the heart. Arrhythmias can cause your heart to beat too rapidly ...
The most common symptoms of POTS are rapid heart rate within 10 minutes of standing or sitting up, lightheadedness and fainting, fatigue, brain fog, nausea, and shortness of breath.
They sometimes persist until treated. The rapid heart rate, if fast enough, reduces the opportunity for the "pump" to fill between beats decreasing cardiac output and consequently blood pressure. The following symptoms are typical with a rate of 150–270 or more beats per minute: [11] Pounding heart; Rapid heart beat; Shortness of breath ...
Symptoms of an irregular heart rhythm can include palpitations and chest discomfort. [2] The timecourse of TIC is most well-studied in experiments on animals. [1] Researchers have found that animals began to exhibit abnormal changes in blood flow after just one day of an artificially generated fast heart rate (designed to simulate a ...
An impulse (action potential) that originates from the SA node at a relative rate of 60–100 bpm is known as a normal sinus rhythm. If SA nodal impulses occur at a rate less than 60 bpm, the heart rhythm is known as sinus bradycardia. If SA nodal impulses occur at a rate exceeding 100 bpm, the consequent rapid heart rate is sinus tachycardia ...
As with any other form of tachycardia (rapid heart beat), the underlying mechanism can be either the rapid discharge of an abnormal focus, the presence of a ring of cardiac tissue that gives rise to a circle movement , [1] or a triggered rapid rhythm due to other pathological circumstances (as would be the case with some drug toxicities, such ...
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