New-onset atrial fibrillation can be serious for which of the following reasons?
a. It increases the risk of stroke and pulmonary embolism from atrial clots.
b. It increases the patient's risk of deep venous thrombosis.
c. It may increase cardiac output to dangerous levels.
d. It indicates that the patient is about to have an MI.
A
In atrial fibrillation the atria do not contract normally; they quiver. This increases the chance of the blood clotting in the atria because of a lack of complete emptying of the atria. These clots can break free and cause embolic strokes and pulmonary emboli. Atrial fibrillation does not indicate impending myocardial infarction or an increased risk of deep venous thrombosis. Atrial fibrillation decreases cardiac output from the loss of atrial kick.
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