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MKSAP Arrhythmias

From CV Questions

QuestionAnswer
Multifocal Atrial Tachycardia - Three or more P-wave morphologic patterns & variable PR intervals. P wave morph. best seen in leads II, III, & V1. - Most often in acutely ill, pulmonary dz pt. Treat pulm. dz & electrolyte imbalances (esp. Mg2+ - give Mag even if levels are nml)
Idioventricular Tachycardia (slow ventricular tachycardia) Wide QRS complex (w/out preceding conducting P waves) & normal heart rate
AV Re-entrant tachycardia Bypass-tract-mediated. Anterograde conduction (A->V) is via AV node (nml) vs retrograde conduction is via the bypass tract. Bypass tract conduction is faster so atrial activation occurs rapidly after QRS complex -> short RP & P wave within ST segment
AV Nodal Re-entrant tachycardia Atria & Ventricles are activated simultaneously from AV node; QRS complex is narrow and there are no P waves
Created by: dsilver2
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