EKG Rhythm Strips 30: Heart Block Challenge Part I
Identify the following rhythms
1.
2.
3.
4
5.
6.
7.
There is no consistent relationship between the P waves and the QRS complexes. The atrium and the ventricles are beating asynchronously.
4.
The PR interval is over .20. What is the actual PR interval?
5.
The PR interval in first degree heart block is prolonged, > .20 sec.
6.
There is one nonconducted P wave that follows each QRS complex. The PR interval on the conducted beats is the same from beat to beat.
7.
The P waves are not associated with a QRS complex.
8.
1.
7.
8.
Answers
1.
|
| 2nd degree heart block type I |
Measure out the P-P interval and you will see that the nonconducted P wave actually falls on the ST segment of the 3rd, 5th, and 7th complex. The progressive lengthening of the PR interval is the hallmark of a 2nd degree type I block.
2.
|
| 2nd degree heart block type II |
Watch the PR intervals. On conducted beats they will be the same from beat to beat. Then there will be some nonconducted P waves present. In this strip there are also some unifocal PVCs
3.
 |
| 3rd degree heart block |
There is no consistent relationship between the P waves and the QRS complexes. The atrium and the ventricles are beating asynchronously.
4.
|
| 1st degree heart block |
5.
|
| 1st degree heart block |
6.
|
| 2nd degree heart block type II |
7.
|
| 3rd degree heart block |
8.
|
| 2nd degree heart block type I |
There is progressive lengthening of the PR interval over three beats followed by a nonconducted P wave after the 1st and 4th complexes.
Reviewed 3/1/16
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