In which AV block is there no relationship between P waves and QRS complexes?

In complete AV block, also known as third-degree AV block, there is a total failure of electrical impulses from the atria to the ventricles. This results in a dissociation between the P waves and the QRS complexes. The atria and the ventricles are functioning independently of one another; consequently, P waves can occur without any corresponding QRS complexes, and vice versa. This lack of communication leads to an irregular heartbeat and can result in a slower heart rate as the ventricles may rely on an escape rhythm from a lower pacemaker site. Understanding this mechanism is crucial for recognizing the severity and potential consequences of complete AV block, including its implications for patient management and treatment options.