Which ECG findings would the nurse expect in a patient who has both a first-degree heart block and a bundle branch block?
1. An ST segment elevation and a QT interval of < 0.44 second
2. An ST segment elevation and an inverted T wave
3. A PR interval of 0.24 second and a QRS complex width of 0.16 second
4. A QT interval of > 0.44 second and a PR interval of 0.16 second
3
Rationale 1: ST elevation and the length of the QT interval are not related to first-degree block or bundle branch block.
Rationale 2: ST segment elevation and inverted T waves are both indicative of myocardial ischemia/injury but are not related to bundle branch block.
Rationale 3: A PR interval of > 0.20 second indicates first-degree block, and a QRS complex width of > 0.12 second is bundle branch block.
Rationale 4: This is a normal PR interval. The QT interval is not associated with bundle branch block.
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