ECG Strip 29
This is ECG recorded by a cardiologic check of a 21 years old girl. On first sight it may look like normal but the opposite is true. There is a complete dissociation of P waves and QRS complexes. I marked the P waves by small dots in lead II. It is a case of third-degree AV block as the young woman suffers from an inherited disorder of her AV node. The electric impulses probably arise in ventricles in an area just below the AV node and that is why the QRS complexes are narrow and why there is not heavy bradycardia. This girl must be regularly monitored and in case of complications (bradycardia, syncope, etc.), she must be paced.