What are some causes of a third-degree AV block?
a. certain drugs, such as quinidine and atropine
b. age, digitalis intoxication, or myocardial infarction
c. heart disease and damage from uncontrolled diabetes mellitus
d. hypertension, coronary artery disease, and cardiomyopathy
Answer: b. age, digitalis intoxication, or myocardial infarction
Some causes of a third-degree AV block are age, digitalis intoxication, and myocardial infarction. this is also called a complete heart block because no impulses are being transmitted from the atria to the ventricles.