ECG Rhythm Interpretation

In this problem, we are asked to interpret a specific EKG rhythm strip. Let's analyze it systematically by looking at the rhythm, the rate, and the presence or absence of P waves.

First, let's look for P waves. Looking before each QRS complex, we can see that there are no visible P waves. This tells us the rhythm is likely not originating from the sinoatrial node.

Next, let's examine the QRS complex. Notice that the QRS complexes are narrow, which means they are less than point one two seconds wide. This indicates that the electrical impulse is traveling through the normal conduction system, starting from above the ventricles.

Now, let's determine the heart rate. We can count the number of QRS complexes in a six-second strip or calculate it based on the number of large boxes between R waves.

There are approximately two and a half large squares between each R wave. Using the math, three hundred divided by two point five gives us a rate of about one hundred and twenty beats per minute.