1 / 19

Arrhythmias

Arrhythmias. An arrhythmia is… disturbance of the electrical rhythm of the heart. Classification Supraventicular (sinus, atrial, junctional ) and.. Ventricular Main mechanisms Disorders of impulse formation or automaticity Abnormalities of impulse conduction Re-entry

linus
Download Presentation

Arrhythmias

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Arrhythmias

  2. An arrhythmia is… • disturbance of the electrical rhythm of the heart. • Classification • Supraventicular (sinus, atrial, junctional) and.. • Ventricular • Main mechanisms • Disorders of impulse formation or automaticity • Abnormalities of impulse conduction • Re-entry • Triggered activity

  3. Supraventricular I • Sinus • Sinus arrhythmia -> alteration of heart rate during respiration – not pathological, pronounced in children • Sinus bradycardia and tachycardia • Atrial tachycardia – automaticity, sinoartial disease • Narrow complex tachycardia with abnormal P waves • Atrial flutter – large re-entry circuit (RA encircling tricuspid) • 300/min, some form of AV block • Saw tooth flutter waves • Atrial fibrillation – re-entry, or continued ectopic firing • Paroxysmal or persistent

  4. Supraventricular II • AV node re-entrant tachycardia (AVNRT) • 120-140 tachycardia, why polyuria? • WPW Syndrome, atrioventricular re-entrant tachycardia • Abnormal band of conducting tissue connects the ventricles and the atria • Resembles purkinje tissue, acts as an accessory pathway, 50% asymptomatic • If different pathways have different speeds -> re-entrant -> with symptoms => WPW syndrome • Delta wave is characteristic

  5. AV block • First degree – delayed progression through AV node • Second degree • Type 1 – PR gradually increase until a QRS complex is missed. • Type 2 – Occasionally P wave does not result in a QRS complex. • Third degree – complete heart block.

  6. SA block • First degree – delay between firing of the SA node and depolarisation of the atria • Second degree • Type 1 – conduction time between SA node and surrounding atrial tissue becomes progressively longer – eventually a cycle is missed. • Type 2 – time between SA node and propagation to atria is normal but at some point a cycle is just missed. • Third degree – failure to conduct impulses

More Related