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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]
Normal variation causing LAD is an age-related physiologic change. Conduction defects such as left bundle branch block or left anterior fascicular block can cause LAD on the ECG. Pre-excitation syndrome as well as congenital heart diseases such as atrial septal defect, endocardial cushion defects can also cause LAD on ECG.
This sinus rhythm is important because it ensures that the heart's atria reliably contract before the ventricles, ensuring as optimal stroke volume and cardiac output. [ 4 ] In junctional rhythm, however, the sinoatrial node does not control the heart's rhythm – this can happen in the case of a block in conduction somewhere along the pathway ...
Fibrillation can affect the atrium (atrial fibrillation) or the ventricle (ventricular fibrillation): ventricular fibrillation is imminently life-threatening. Atrial fibrillation affects the upper chambers of the heart, known as the atria. Atrial fibrillation may be due to serious underlying medical conditions and should be evaluated by a ...
Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including: Cardiac rhythm disturbances, such as atrial fibrillation [6] and ventricular tachycardia; [7] Inadequate coronary artery blood flow, such as myocardial ischemia [8] and myocardial infarction; [9] and electrolyte disturbances, such as hypokalemia. [10]
On an electrocardiogram, or ECG, normally the “P wave” corresponds to the atrial contraction, which is followed shortly after by the “QRS complex”—which is the ventricular contraction. During AF, all these small areas are contracting at different times so you end up with this scribble sort of looking ECG, each little peak ...