What is an important complication associated with second-degree AV block Mobitz Type II?

Second-degree AV block Mobitz Type II is characterized by the occasional failure of electrical impulses to conduct from the atria to the ventricles. This type of block is particularly concerning because it can lead to complete heart block or third-degree AV block, which may result in a sudden change in heart rhythm.

When this occurs, there can be significant drops in cardiac output, potentially leading to cardiac arrest. Unlike other types of block, such as Mobitz Type I, Mobitz Type II can progress without warning and without preceding symptoms, which increases the risk of serious complications.

Therefore, the important complication associated with Mobitz Type II is indeed cardiac arrest, as it directly arises from the potential for this block to rapidly progress to a more severe form of heart block, which can impact the heart's ability to pump effectively, leading to life-threatening scenarios.

In contrast, while severe hypotension, ventricular tachycardia, and myocardial infarction are serious conditions, they are not direct complications of Mobitz Type II AV block. They may occur in the context of various cardiac conditions but are not the primary concern with this specific type of AV block.