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There are two major classes of cardiac fibrillation: atrial fibrillation and ventricular fibrillation. Atrial fibrillation is an irregular and uncoordinated contraction of the cardiac muscle of atria. It can be a chronic condition, usually treated with anticoagulation and sometimes with conversion to normal sinus rhythm.
Atrial fibrillation is associated with an increased risk of heart failure, dementia, and stroke. [3] [12] It is a type of supraventricular tachycardia. [14] Atrial fibrillation frequently results from bursts of tachycardia that originate in muscle bundles extending from the atrium to the pulmonary veins. [15]
[citation needed] In the class Aves (birds), there is only one family, Trochilidae (hummingbirds) [1] where the backward flying phenomenon can be found. In the class Insecta (insects), in the infraorder Anisoptera (dragonflies), [ 1 ] genus Hemaris (bee hawk-moths) [ a ] [ 2 ] and order Diptera (true flies), species with this ability can be ...
Junctional rhythms (if a bradycardia) can cause decreased cardiac output. Therefore, the person may exhibit signs and symptoms similar to other bradycardia such as lightheadedness, dizziness, low blood pressure, and fainting. This rhythm can usually be tolerated if the rate is above 50 beats per minute. [citation needed]
Atrial fibrillation is the most common type of irregular heart rhythm, impacting millions of Americans. While several factors can lead to atrial fibrillation (or AFib), research has uncovered a ...
Re-entry is divided into two major types: [Anatomically Defined] re-entry and [Functionally Defined] re-entry. The circus movement can occur around an anatomical or functional core. Either type may occur alone, or together. [citation needed] Anatomically defined re-entry has a fixed anatomic pathway. Anomalous conduction via accessory pathways ...
Some people’s phobia is resistant, so recovery can take longer and be very difficult. But many people do respond in a shorter time period. Therapy may keep the phobia at bay for years or, for ...
Image credits: cbn11 "Impolite behaviors on public transport often arise because people are absorbed in their own world—running late, rushing to work, or simply zoning out," explains etiquette ...