Practice EKG Rhythm Strips 226

Identify the following rhythms.

1.

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Answers

1.

Atrial flutter

The rhythm is slightly irregular with a heart rate of 90/min.   There are flutter waves between the QRS complexes.  These are more prominent in the V1 lead.  No ectopic beats are noted.  PR:  ---,  QRS:  .10 sec.  QT:  .28 sec Interpretation:  Atrial flutter

2.

3rd degree heart block 

The rhythm is regular.   The ventricular rate is 35 and an atrial rate of 100/min.  The P waves are uniform and upright but are not paired with a QRS complex.  On the 3rd complex you can see a P wave that is fused with the S wave of the QRS complex.  No ectopic beats are seen.   PR:  ---,  QRS:  .16 sec,  QT:  .40 sec.   Interpretation:  3rd degree heart block

3.

Normal sinus rhythm with frequent PACs

The rhythm is is irregular.   The rate is 80/min.  The P waves are positive but are not uniform. The QRS complex is narrow.  There are premature atrial complexes seen,  the 2nd, 6th, and 9th complexes.  The P waves of the 2nd and 9th complexes are fused with the T waves of the preceding complexes.  There is a brief pause following the PACs.  PR:  .14 sec,  QRS:  .08 sec,  QT:  .40 sec. Interpretation:  Normal sinus rhythm with frequent PACs

4.

Normal sinus rhythm with uniform PVCs

The rhythm is irregular.   The heart rate is 90/min.   The P waves are upright and associated with a QRS complex.  The PR interval is prolonged.  There are unifocal PVCs in a quadrigeminal pattern. A compensatory pause follows each PVC.  PR:  .24 sec,  QRS:  .08 sec,  QT:  .40 sec. Interpretation:  Normal sinus rhythm with uniform PVCs

5.

 Ventricular fibrillation

The rhythm is very irregular.  The rate is around 300/min.   No P waves are seen.   The QRS complex is very disorganized and wide.   PR:  ---,  QRS:  .16 sec.  QT:  ---.  Interpretation: Ventricular fibrillation