Practice EKG Rhythm Strips 138

Identify the following rhythms.

1.

2.

3.

4.

5.

Answers

1.

1st degree block

The rhythm is regular with a rate of 75/min.   There are upright P waves associated with each QRS complex, however, the PR interval is prolonged.  No ectopic beats are identified.  PR:  .28 sec,  QRS:  .10 sec,  QT:  .38 sec.

2.

2nd degree block type I

The rhythm is irregular and the rate is 50/min.   There are upright P waves present but the P waves following the 1st and 3rd complexes are not conducted.   There is progressive prolongation of the PR interval.  No ectopy is present.   PR: ---,  QRS:  .10 sec,  QT:  .52 sec.



3.

Sinus arrhythmia with a U wave

The rhythm is irregular with a rate of 80/min.  There are upright P waves that precede the QRS complexes.  There are U waves that follow the T waves.   As the rate increases the P waves and the U wave merge giving the P waves a varying morphology.  PR:  .20 sec.  QRS:  .12 sec,  QT:  .40 sec


4.

2nd degree AV block type II

The rhythm is irregular.   The rate is 50/min.   There are upright P waves present but the P waves following the 1st, 3rd, and 5th complexes are not conducted.  The PR interval on the conducted beats are consistent.  No ectopic beats are present.   PR:  .24 sec,  QRS:  .12 sec,  QT:  .32 sec.


5.

Sinus bradycardia with sinus arrest

The rhythm is irregular with a rate of 40/min.   The P waves are upright and associated with a QRS complex.  No ectopic beats are present.   A 1.92 second pause follows the 2nd complex.  PR:  .20 sec, QRS:  .08 sec,  QT:  .42 sec