Practice EKG Rhythm Strips 157
Identify the following rhythms.
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The rhythm is regular and the rate is 65/min. There are uniform, upright P waves before each QRS complex. However the PR interval is prolonged. No ectopy is noted. PR: .32 sec, QRS: .08 sec, QT: .36 sec.
2.
The rhythm is regular. The P-P rhythm is regular as well as the R-R interval. The atrial rate is 120/min and the ventricular rate is calculated to be 34/min. The P waves are upright and uniform. However, there are two non-conducted P waves for each QRS complex. Some P waves are buried in the T waves. The PR interval is consistent. PR: .20 sec. QRS: .10 sec, QT: .44 sec.
3.
The rhythm is irregular because of a dropped beat. The atrial rate is 70/min and the ventricular rate is 50/min. The are upright P waves before each QRS complex but there is a non-conducted P wave that follows the 3rd complex. The PR interval increases over successive beats: complex 1 PR: .20 sec, complex 2 PR .28 sec, complex 3 PR .32 sec. No ectopic beats are present. PR: ---, QRS: .10 sec, QT: .52 sec
4.
The rhythm is irregular due to a pause. The rate is 50. There are uniform, upright P waves before each QRS complex. No ectopic beats are noted. A sinus 1.96 second pause follows the 1st complex. The pause is less than 2 cardiac cycles so it is termed a pause rather that a period sinus arrest. PR: .12 sec, QRS: .08 sec, QT: .36 sec.
5.
The rhythm is irregular. The rate is 70. The P waves are upright and precede the QRS complexes. The PR interval is prolonged. There is a premature atrial complex that follows the 4th complex. The P wave of the PAC is hidden with the preceding T wave. There is a short noncompensatory pause that follows the PAC. PR: .24 sec, QRS: .12 sec, QT: .40 sec
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Answers
1.
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| 1st degree block |
The rhythm is regular and the rate is 65/min. There are uniform, upright P waves before each QRS complex. However the PR interval is prolonged. No ectopy is noted. PR: .32 sec, QRS: .08 sec, QT: .36 sec.
2.
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| 2nd degree AV block type II |
The rhythm is regular. The P-P rhythm is regular as well as the R-R interval. The atrial rate is 120/min and the ventricular rate is calculated to be 34/min. The P waves are upright and uniform. However, there are two non-conducted P waves for each QRS complex. Some P waves are buried in the T waves. The PR interval is consistent. PR: .20 sec. QRS: .10 sec, QT: .44 sec.
3.
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| 2nd degree AV block type I |
The rhythm is irregular because of a dropped beat. The atrial rate is 70/min and the ventricular rate is 50/min. The are upright P waves before each QRS complex but there is a non-conducted P wave that follows the 3rd complex. The PR interval increases over successive beats: complex 1 PR: .20 sec, complex 2 PR .28 sec, complex 3 PR .32 sec. No ectopic beats are present. PR: ---, QRS: .10 sec, QT: .52 sec
4.
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| Sinus pause |
The rhythm is irregular due to a pause. The rate is 50. There are uniform, upright P waves before each QRS complex. No ectopic beats are noted. A sinus 1.96 second pause follows the 1st complex. The pause is less than 2 cardiac cycles so it is termed a pause rather that a period sinus arrest. PR: .12 sec, QRS: .08 sec, QT: .36 sec.
5.
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| 1st degree block, sinus arrhythmia with a PAC |
The rhythm is irregular. The rate is 70. The P waves are upright and precede the QRS complexes. The PR interval is prolonged. There is a premature atrial complex that follows the 4th complex. The P wave of the PAC is hidden with the preceding T wave. There is a short noncompensatory pause that follows the PAC. PR: .24 sec, QRS: .12 sec, QT: .40 sec
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