Third-Degree or Complete AV Block (1 of 3) :
Third-Degree or Complete AV Block (1 of 3) No communication whatsoever between atria and ventricles
Two pacemakers by definition:
One supraventricular, one ventricular
Atrial and ventricular rates are typically different.
No capture or fusion waves anywhere
Key feature is that PR intervals are completely changing and have no effect on the ventricular rate. Chapter 35
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Third-Degree or Complete AV Block (2 of 3) :
Third-Degree or Complete AV Block (2 of 3) Chapter 35
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Third-Degree or Complete AV Block (3 of 3) :
Third-Degree or Complete AV Block (3 of 3) Chapter 35
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Two Examples :
Two Examples Chapter 35
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Slide 6:
Chapter 35
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Differential Diagnosis (1 of 2) :
Differential Diagnosis (1 of 2) Sclerosis and fibrosis
Lev disease
Lenegre disease
Idiopathic
AMI and ischemic heart disease Drugs
Calcium channel blockers
Digoxin
Beta blockers
Procainamide
Quinidine
Disopyramide
Propafenone
Amiodarone
Adenosine Chapter 35
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Differential Diagnosis (2 of 2) :
Differential Diagnosis (2 of 2) 4. Increased vagal tone: carotid sinus massage, pain, sleep, etc.
5. Surgery and trauma to the heart
6. Cardiomyopathies
Myocarditis
Infective endocarditis
Electrolyte disorders
Congenital heart disease Chapter 35
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