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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 p...

Identify the following rhythms. 1. 2. 3. 4. 5. Answers 1. Normal sinus rhythm with unifocal PVCs The rhythm is irregular with premature ventricular contractions.  The rate is 80/min.  The P waves are upright and are paired with a QRS complex.  The PR interval is prolonged.  Two unifocal PVCs are present.  A compensatory pause follows each PVC.  PR: .24 sec,  QRS:  .08 sec,  QT:  .40 sec. 2. Idioventricular rhythm The rhythm is irregular with a rate of 40/min.   No P waves are present.   The QRS complexes are wide and poorly organized.   PR:  ---,   QRS:  .44 sec,  QT:  .88 sec 3. Atrial flutter with a pair of three beat runs of ventricular tachycardia The rhythm is irregular.   No P waves are seen but there are flutter waves present.   There are two 3 beat runs of ventricular tachycardia pre...

Identify the following rhythms. 1. 2. 3. 4. 5. Answers 1. Complete heart block The rhythm is regular with a rate of 38/min.   The P waves are upright and uniform.   There is no association between the P waves and the QRS complexes.   A P wave is buried in the ST segment of the 2nd complex.  No ectopic beats are seen.   The QRS complex is wide suggesting an ventricular escape rhythm.   PR:  ---,  QRS:  .16 sec,  QT:  .52 sec. 2. Junctional rhythm changing to a sinus rhythm The rhythm is irregular with a rate of 70/min.   The initial 3 complexes have negative P waves and the remaining 4 complexes have upright P waves.  There is slight pause after the 3rd complex in which the rhythm transitions from a junctional rhythm to a sinus rhythm.   All the P waves have a corresponding QRS complex.  No ectopic bea...

Identify the following rhythms. 1. 2. 3. 4. 5. Answers 1. Atrial fibrillation with rapid ventricular response The rhythm is very irregular with a rate of 160/min.  No P waves are seen.  No ectopic beats are noted. PR:  ---,  QRS:  .10 sec,  QT:  .28 sec. 2. Atrial paced The rhythm is regular with a heart rate of 68/min.   The P waves are preceded by an atrial pacing stimulus.   No ectopic beats are noted.   PR:  .16 sec,  QRS:  .08 sec,  QT:  .36 sec. 3. Dual paced The rhythm is regular.   The heart rate is 68/min.   The P waves and the QRS complexes are preceded by a pacer spike.   PR:  .12 sec,  QRS:  .16 sec,  QT:  .44 sec. 4. Normal sinus rhythm with bigeminal PVCs The rhythm is irregular due to the multiple PVCs.   The ventricular rate is 100...

Identify the following rhythms. 1. 2. 3. 4. 5. Answers 1. 1st degree block The rhythm is regular with a rate of 60/min.   The P waves are upright, uniform and precede the QRS complexes.   The PR interval is prolonged.  No ectopic beats are noted.   PR:  .40 sec,  QRS: .16 sec,  QT:  .48 sec. 2. 2nd degree block type II The rhythm is irregular.   The heart rate is 50/min.   The P wave are upright.   Nonconducted P waves follow the 2nd and 4th complexes.   There is progressive elongation of the PR interval over successive beats.   PR:  .16/.36 sec.  PR:  .12 sec,  QT:  .48 sec. 3. 2nd degree AV block type II The rhythm is regular with a ventricular rate of 42/min.   The P waves are upright and uniform.  Some nonconducted P waves follow each QRS complex.  The PR interval is consistent o...