Telemetry Certification Practice Test

Mobitz Type II heart block is characterized by a pattern where every alternate P wave is blocked. In this type of block, the conduction through the atrioventricular (AV) node is inconsistent and typically does not show a progressive lengthening of the PR interval prior to the dropped beat, which is a hallmark of Mobitz Type I heart block (also known as Wenckebach). Instead, in Mobitz Type II, the PR interval remains fixed for those beats that are conducted, and then a P wave will simply not be followed by a QRS complex. This results in the phenomenon of blocked P waves occurring at regular intervals without a preceding lengthening of the PR interval. Understanding this characteristic is crucial for distinguishing Mobitz Type II from other types of heart block.