How would the nurse differentiate between the two types of second-degree heart block?
1. Assess the QT interval.
2. Assess the ventricular rate.
3. Assess PR intervals.
4. Assess the configuration of the P wave.
3
Rationale 1: There will be no change in QT intervals in either block.
Rationale 2: The ventricular rate may be slower in both blocks.
Rationale 3: In Mobitz I block, the PR interval progressively lengthens until a QRS complex is dropped. In Mobitz II, the PR intervals are consistent.
Rationale 4: P waves will be of normal configuration in both blocks.
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