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Supraventricular tachycardia (SVT) is an umbrella term for fast heart rhythms arising from the upper part of the heart. [2] This is in contrast to the other group of fast heart rhythms – ventricular tachycardia , which start within the lower chambers of the heart . [ 2 ]
It is a type of supraventricular tachycardia (SVT), meaning that it originates from a location within the heart above the bundle of His. AV nodal reentrant tachycardia is the most common regular supraventricular tachycardia. It is more common in women than men (approximately 75% of cases occur in females). The main symptom is palpitations.
Arrhythmia may be classified by rate (tachycardia, bradycardia), mechanism (automaticity, re-entry, triggered) or duration (isolated premature beats; couplets; runs, that is 3 or more beats; non-sustained = less than 30 seconds or sustained = over 30 seconds). [citation needed] Arrhythmias are also classified by site of origin: [citation needed]
The cause of the palpitations during these conditions is often a sustained supraventricular tachycardia or ventricular tachyarrhythmia. [1] Supraventricular tachycardias can also be induced at the termination of exercise when the withdrawal of catecholamines is coupled with a surge in the vagal tone . [ 1 ]
Over 99% of individuals in the general population will have at least one PAC in a 24 hour period. [6] Many PACs can indicate increased risk of atrial fibrillation and/or ischemic stroke . [ 6 ] The threshold for number of PACs which substantially raises the risk atrial fibrillation is debatable, but some estimates range between in excess of 500 ...
Image credits: windexfresh #5. I took out salary continuance insurance until I was 65 instead of just the 2 years I was originally thinking. I was only 35 when I did that.
The withdrawal reflex (nociceptive flexion reflex or flexor withdrawal reflex) is a spinal reflex intended to protect the body from damaging stimuli. [1] The reflex rapidly coordinates the contractions of all the flexor muscles and the relaxations of the extensors in that limb causing sudden withdrawal from the potentially damaging stimulus. [2]
Surely, someone would have thrown their coat over her, ran to look for water, screamed at her to stop, drop and roll. Found a fire extinguisher. Yelled for help .