What is Mobitz Type II?
Mobitz Type II, also known as second-degree atrioventricular (AV) block Type II, is a condition characterized by the
intermittent failure of electrical impulses to pass through the AV node from the atria to the ventricles. This
results in dropped heartbeats and can be particularly concerning in the pediatric population.
What are the Causes?
In children, Mobitz Type II can result from congenital heart diseases, surgical complications, infections such as
myocarditis, or genetic conditions. It can also be caused by conditions affecting
the
conduction system of the heart.
What are the Symptoms?
Symptoms may vary but can include
palpitations, dizziness, fatigue, and in severe
cases,
syncope (fainting). These symptoms arise due to the irregular heart rhythm and
reduced cardiac output.
What are the Treatment Options?
Treatment depends on the severity and underlying cause. In asymptomatic cases, close monitoring may suffice.
Symptomatic patients might require a
pacemaker to maintain a regular heart rhythm.
Medications are generally less effective but can be used in specific situations.
What is the Prognosis?
The prognosis for children with Mobitz Type II varies. Those with a pacemaker generally lead normal lives, though
they require lifelong follow-up. Without treatment, the condition can lead to more severe forms of
title="Heart Block">heart block and increased risk of complications.
Complications and Risk Factors
Complications can include progression to complete heart block, heart failure, and in rare cases, sudden cardiac
arrest. Risk factors include the presence of underlying congenital heart defects, previous heart surgeries, and
family history of conduction system diseases.
Preventative Measures
While some cases of Mobitz Type II are unavoidable, early diagnosis and management of underlying conditions like
congenital heart disease can help minimize risk. Genetic counseling may be recommended for families with a history
of heart conduction disorders.
