Practice EKG Rhythm Strips 126
Identify the following rhythms.
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Answers
1.
The underlying rhythm is regular. The calculated rate is 65. There are upright P waves that precede the QRS complexes. There is a single ectopic PVC. PR: .20 sec. QRS: .10 sec. QT: .40 sec
2.
The underlying rhythm is regular. The calculated rate is 62. There are upright P waves before each sinus QRS complex. A single PJC is noted, the 3rd complex. The P wave of this complex is retrograde in origin. PR: 12 sec, QRS: .08 sec, QT: .44 sec.
3.
The rhythm is irregular due to the pause. The rate is 80 per minute (10 sec strip rule). There are upright P waves before each QRS complex. Notice that the P waves are wide, about .12 sec. There may be some underlying left atrial enlargement. No ectopy is noted. There is .8 sec pause after the 3rd complex. The pause is less than two cardiac cycles so that is why it is termed a pause and not an arrest. PR: .24 sec, QRS: .08 sec, QT: .44 sec.
4.
The rhythm is irregular. The rate is 50/minute. The 1st, 2nd, and 5th complexes have upright P waves. The 3rd and 4th complexes do not have P waves. The R-R interval between the 2nd and 3rd complex is longer than the complexes of sinus origin, this suggests an escape mechanism rather than a premature beat. The same delay is noted between the 3rd and 4th complexes. The 5th complex is sinus in origin. PR: .24, QRS: .12 sec, QT: .48 sec
5.
The rhythm is irregular owing to the presence of a PAC, 3rd complex. Otherwise the underlying rhythm is regular. The calculated rate is 44. There are upright P waves before each QRS complex. A single PAC is noted. The 3 complex has a P wave that is of slightly different morphology than the P waves of sinus origin. There are U waves that follow each T waves. PR: 12 sec, QRS: .08 sec, QT: .44 sec.
1.
2.
3.
4.
5.
Answers
1.
 |
| Normal sinus rhythm with a PVC |
The underlying rhythm is regular. The calculated rate is 65. There are upright P waves that precede the QRS complexes. There is a single ectopic PVC. PR: .20 sec. QRS: .10 sec. QT: .40 sec
2.
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| Normal sinus rhythm with a PJC |
The underlying rhythm is regular. The calculated rate is 62. There are upright P waves before each sinus QRS complex. A single PJC is noted, the 3rd complex. The P wave of this complex is retrograde in origin. PR: 12 sec, QRS: .08 sec, QT: .44 sec.
3.
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| Normal sinus rhythm 1st degree block with a pause |
The rhythm is irregular due to the pause. The rate is 80 per minute (10 sec strip rule). There are upright P waves before each QRS complex. Notice that the P waves are wide, about .12 sec. There may be some underlying left atrial enlargement. No ectopy is noted. There is .8 sec pause after the 3rd complex. The pause is less than two cardiac cycles so that is why it is termed a pause and not an arrest. PR: .24 sec, QRS: .08 sec, QT: .44 sec.
4.
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| Normal sinus rhythm 1st degree block with junctional escape beats |
The rhythm is irregular. The rate is 50/minute. The 1st, 2nd, and 5th complexes have upright P waves. The 3rd and 4th complexes do not have P waves. The R-R interval between the 2nd and 3rd complex is longer than the complexes of sinus origin, this suggests an escape mechanism rather than a premature beat. The same delay is noted between the 3rd and 4th complexes. The 5th complex is sinus in origin. PR: .24, QRS: .12 sec, QT: .48 sec
5.
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| Normal sinus rhythm with prominent U waves and a PAC |
The rhythm is irregular owing to the presence of a PAC, 3rd complex. Otherwise the underlying rhythm is regular. The calculated rate is 44. There are upright P waves before each QRS complex. A single PAC is noted. The 3 complex has a P wave that is of slightly different morphology than the P waves of sinus origin. There are U waves that follow each T waves. PR: 12 sec, QRS: .08 sec, QT: .44 sec.
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