Practice EKG Rhythm Strips 171
Identify the following rhythms.
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Answers
1.
The rhythm is irregular with a rate of 50/min. There are upright P waves present but there is progressive lengthening of the PR interval. A non-conducted P wave follows the 3rd complex. No ectopic beats are present. PR---, QRS: .08 sec, QT: .42 sec.
2.
The rhythm is irregular. The rate is 80/min. There are both upright and retrograde P waves present. The P waves of the 2nd and 3rd complexes are negative while the P waves of the 5th, 6th, and 8th are sinus in origin. There are trigeminal unifocal PVCs present. PR: .12 sec, QRS: .08 sec, QT: .40 sec.
3.
The rhythm is regular with a rate of 78/min. The P waves are biphasic. No ectopic beats are noted. PR: .12 sec, QRS: .08 sec, QT: .30 sec.
4.
The rhythm is irregular. There are upright P waves present. For the sinus beats the intervals are as follows: PR: .16 sec, QRS: .08, QT: .72 sec. There is T wave inversion. There is a 13 beat run of polymorphic ventricular tachycardia. The VT is precipitated by a R-on-T episode in which the VT begins on the up slope of the inverted T wave. The long QT interval may also play a factor in the episode of polymorphic VT.
5.
The rhythm is irregular with a rate of 90/min. There are upright P waves present of differing morphology and varying PR intervals. For this to be wandering atrial pacemaker there should be at least 3 P waves of varying morphology with a rate less than 100/min. PR: ---, QRS: .08 sec, QT: .36 sec
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2.
3.
4.
5.
Answers
1.
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| 2nd degree AV block type I |
The rhythm is irregular with a rate of 50/min. There are upright P waves present but there is progressive lengthening of the PR interval. A non-conducted P wave follows the 3rd complex. No ectopic beats are present. PR---, QRS: .08 sec, QT: .42 sec.
2.
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| Normal sinus rhythm with a couplet of junctional beats and trigeminal PVCs |
The rhythm is irregular. The rate is 80/min. There are both upright and retrograde P waves present. The P waves of the 2nd and 3rd complexes are negative while the P waves of the 5th, 6th, and 8th are sinus in origin. There are trigeminal unifocal PVCs present. PR: .12 sec, QRS: .08 sec, QT: .40 sec.
3.
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| Normal sinus rhythm with biphasic P waves |
The rhythm is regular with a rate of 78/min. The P waves are biphasic. No ectopic beats are noted. PR: .12 sec, QRS: .08 sec, QT: .30 sec.
4.
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| Sinus arrhythmia with a run of polymorphic ventricular tachycardia |
The rhythm is irregular. There are upright P waves present. For the sinus beats the intervals are as follows: PR: .16 sec, QRS: .08, QT: .72 sec. There is T wave inversion. There is a 13 beat run of polymorphic ventricular tachycardia. The VT is precipitated by a R-on-T episode in which the VT begins on the up slope of the inverted T wave. The long QT interval may also play a factor in the episode of polymorphic VT.
5.
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| Wandering atrial pacemaker |
The rhythm is irregular with a rate of 90/min. There are upright P waves present of differing morphology and varying PR intervals. For this to be wandering atrial pacemaker there should be at least 3 P waves of varying morphology with a rate less than 100/min. PR: ---, QRS: .08 sec, QT: .36 sec
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