Practice EKG Rhythm Strips 185

Identify the following rhythms.


1.



2.



3.


4.



5.












Answers


1.
Normal sinus rhythm changing to a junctional rhythm











The rhythm is regular with a heart rate of 58/min.   There are P waves present with the first four complexes but the P wave is absent with the remaining complexes.   The QRS complex is narrow with some down slopping of the ST segment.   No ectopic beats are present.   PR:  .16 sec,  QRS:  .08 sec,  QT:  .40 sec.  


2.
Normal sinus rhythm












The rhythm is regular with a rate of 71/min.   The P waves are uniform, upright, and have a corresponding QRS complex.   No ectopic beats are noted.   The ST segment is down slopping with inversion of the T wave.   PR:  .12 sec,  QRS:  .08 sec,  QT:  .36 sec.

3.
Sinus tachycardia













The rhythm is regular with a heart rate of 167/min.   Uniform P waves precede each QRS complex.  No ectopic beats are noted.  PR:  .10 sec,  QRS:  .08 sec,  QT:  .30 sec.


4.
Supraventricular tachycardia













The rhythm is regular with a ventricular rate of 167/min.   No P waves are seen.   The QRS complex is narrow.   PR:  ---,  QRS:  .06 sec,  QT:  .32 sec.


5.
Ventricular paced with bigeminal PVCs











The rhythm is irregular due to the many PVCs.   The ventricular rate is 100/min.   No P waves are evident.   The ventricle is being paced.   Unifocal PVCs are present every other beat.   PR:  ---,  QRS:  .16 sec,  QT:  .48 sec.

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