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Atrial Flutter Can Deteriorate Into Atrial Fibrillation , And A Person Can Have Both Arrhythmias At The Same Time

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Vaishnavi Kashid
Atrial Flutter Can Deteriorate Into Atrial Fibrillation , And A Person Can Have Both Arrhythmias At The Same Time

Increased calcium release from the sarcoplasmic reticulum and greater calcium sensitivity in an Atrial Fibrillation heart can lead to intracellular calcium buildup and downregulation of L-type calcium channels. This shortens the action potential length and the refractory period, facilitating the conduction of re-entrant waves. Reduced atrial refractory time and wavelength can be caused by increased expression of inward-rectifier potassium ion channels. The arrhythmia is caused by the aberrant distribution of gap junction proteins such as GJA1 (also known as Connexin 43) and GJA5 (Connexin 40).

 (AF) differs from atrial flutter (AFL), which occurs as an ordered electrical circuit in the right atrium. On an ECG, AFL produces typical saw-toothed F-waves with continuous amplitude and frequency, whereas Atrial Fibrillation does not. The discharges in the AFL flow swiftly across the atrium at a rate of 300 beats per minute (bpm). Except at sites where the local activation rate exceeds 500 bpm, there is no such regularity in Atrial Fibrillation.

While Atrial Fibrillation and atrial flutter are separate arrhythmias. While AF electrical impulses occur at a rapid rate, the majority of them do not result in a heartbeat. A heartbeat occurs when an electrical impulse from the atria travels to the ventricles through the atrioventricular (AV) node and causes them to contract.

If all atrioventricular impulses were to flow via the AV node during Atrial Fibrillation there would be significant ventricular tachycardia, resulting in a dramatic drop in cardiac output. The AV node prevents this perilous circumstance because its reduced conduction velocity slows the rate at which impulses reach the ventricles during Atrial Fibrillation.

Read More - https://cmilatestinsights.blogspot.com/2023/04/during-atrial-fibrillation-top-chambers.html


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Vaishnavi Kashid
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