The Nurse Notes That PR Intervals Are Getting Progressively Longer

question 28

Multiple Choice

The nurse notes that PR intervals are getting progressively longer before a QRS complex is dropped on a patient's cardiac rhythm strip. The nurse interprets this as which cardiac dysrhythmia?

• A)First-degree atrioventricular (AV) block
• B)Second-degree AV block, Mobitz I
• C)Secondary-degree AV block, Mobitz II
• D)Third-degree AV block

---

Definitions:

Average Total Costs

The total costs (fixed and variable) of production divided by the quantity of output produced.

Average Fixed Costs

The total fixed costs divided by the quantity of output produced, indicating the cost per unit that does not change with output level.

Average Total Costs

The cost of producing each unit, calculated by dividing the entire production cost by the total number of units made.

Marginal Cost

The increase in cost that arises from producing one additional unit of a good or service.