Cardiac Dysrhythmias Part 2 Verified Solutions
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Cardiac Dysrhythmias Part 2 Verified Solutions 
First-degree heart block is characterized by a prolonged PR interval of more than 0.20 seconds on an 
EKG. Patients typically do not experience symptoms with this condition. 
Causes of first-degree heart block include myocardial infarction (MI), coronary artery disease (CAD), 
rheumatic fever, hyperthyroidism, electrolyte imbalances, vagal stimulation, and certain medications 
such as digitalis, beta-blockers, calcium channel blockers, and fle...