Second-Degree AV Heart Block Mobitz Type II

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Second-Degree AV (atrioventricular) block, specifically Mobitz Type II, is a cardiac conduction disorder where there is a partial block of the electrical signals between the atria (upper chambers of the heart) and the ventricles (lower chambers of the heart). In Mobitz Type II, some of the atrial impulses fail to reach the ventricles without any warning, leading to irregular heartbeats.
Here are some key points about Second-Degree AV Heart Block Mobitz Type II:
1. *Electrical Conduction in the Heart:*
- In a healthy heart, electrical signals originating in the atria travel to the ventricles, causing them to contract and pump blood.
- The AV node is a critical part of this conduction system, slowing down the electrical signal to allow the ventricles enough time to fill with blood before contracting.
2. *Mobitz Type II Characteristics:*
- In Mobitz Type II, some atrial impulses are blocked from reaching the ventricles without any warning.
- Unlike Mobitz Type I (Wenckebach), where there is a progressive lengthening of the PR interval before a dropped beat, Mobitz Type II is characterized by a constant PR interval before a sudden blocked beat.
3. *Clinical Implications:*
- Mobitz Type II is considered more serious than Mobitz Type I because the blocked impulses often indicate a defect below the AV node, which can lead to complete heart block.
- Complete heart block can be life-threatening, requiring a pacemaker to regulate the heart's rhythm and ensure proper pumping of blood.
4. *Causes and Risk Factors:*
- Mobitz Type II can result from various cardiac conditions, such as ischemic heart disease, myocardial infarction (heart attack), or degeneration of the heart's conduction system.
- Certain medications, aging, and structural heart diseases can also contribute to the development of Mobitz Type II.
5. *Symptoms:*
- Patients might experience dizziness, lightheadedness, fainting (syncope), chest pain, or shortness of breath.
- Some individuals with Mobitz Type II may not exhibit any symptoms and only discover the condition during a routine medical checkup or after experiencing complications.
6. *Treatment:*
- Treatment depends on the severity of symptoms and the underlying cause.
- In symptomatic cases or when Mobitz Type II progresses to complete heart block, a pacemaker is implanted to regulate the heart's rhythm and ensure proper conduction of electrical signals.
It's important to note that any concerns about heart rhythm abnormalities should be discussed with a healthcare professional. This information is for general understanding and should not be considered medical advice.
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