How Is the Qrs Complex Described in Atrial Fibrillation
The width of the preexcited QRS complex and the amplitude of the ST-T wave segment usually obscure the retrograde P wave on the surface ECG. When the P waves can be identified they are inscribed within the ST-T wave segment with an RP interval that may be more than half of the tachycardia RR interval because retrograde conduction occurs slowly.
The atrial rate is typically 240 bpm to 300 bpm but conduction delays in the atrial circuit due to scars from prior ablation surgery or antiarrhythmic drugs can slow the rate to.
. 65 When the circuit revolves in the opposite direction flutter waves typically appear positive in the inferior ECG leads and negative in.
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