Chapter22
Detailed Answers to Assess Your Understanding
1.c: Sinus bradycardia is rhythm that arises from the SA node and has a heart rate of less than 60 BPM.
2.a:Accelerated junctional rhythm has a normal heart rate of 60 to 100 BPM.
3.b:Sinus bradycardia has a/an regular rhythm.
4.c: Atrial fibrillation Which of the following produces a totally irregular rhythm.
5.d:A patterned irregular rhythm is seen when premature complexes occur every other (second) complex, every third complex, or every fourth complex.
6.c:AV heart block has more P waves than QRS complexes.
7.a:Enlarged or damaged atria produce P waves that look different than sinus P waves.
8.d:Sinus tachycardia will likely have narrow QRS complexes.
9.b:Low-voltage or abnormally small QRS complexes are seen in obese patients.
10.c:Premature ventricular complexes produce QRS complexes that look different than those that arise above or at the AV junction.
11.d:With 3rd-degree AV block, the QRS complexes are slower than the P wave rate because there is complete blockage of the AV node.
12.d:Constant PR intervals of greater than 0.20 seconds are characteristic of 1st-degree AV heart block.
13.b:With wandering atrial pacemaker, the P’R intervals vary.
14.d:The PR intervals with 2nd-degree AV heart block, type Ibecome progressively longer.
15.c:There will be an absence of PR intervals in 3rd-degree AV heart block.
16.b:Type II 2nd-degree AV heart block has PR intervals that are constant.
17.a:With atrial dysrhythmias, the atrial waveforms differ in appearance from normal sinus P waves.
18.d:Your patient is a 67-year-old female with a history of cardiac problems. After attaching her to the monitor, you see a slightly irregular rhythm with normal QRS complexes, but each P’ wave is different. This rhythm is wandering atrial pacemaker.
19.a:These questions relate to the scenario at the beginning of this chapter. The origin of the narrow QRS complexes is supraventricular.
20.a:The underlying rhythm is most likely multifocal atrial tachycardia.