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atrial fibrillation
The electrical pattern is abnormal prior to the QRS complex, and the frequency between the QRS complexes has increased.

second degree (partial) block
One-half of the P waves are not followed by the QRS complex and T waves while the other half are.

Third degree block
No correlation between atrial activity (the P wave) and ventricular activity (the QRS complex).

ventricular tachycardia
Abnormal QRS complex shape.

ventricular fibrillation
No normal electrical activity.
