Are the P waves regular? Start from the beginning of one P wave to the beginning of the next P wave, measuring with calipers or a paper. Are there P waves present? Since we have 3 seconds here, we’ll multiply the number of P waves by 20, so 4 P waves times 20 shows an atrial rate of 80 bpmģ. Here we have 4 R waves in 3 seconds, times 20, equals 80 bpm (remember normal HR falls between 60-100).Ģ. What is the heart rate? Count how many R waves in 6 seconds & multiply by 10, or count how many in 3 seconds & multiply by 20. Let’s evaluate a normal sinus rhythm using these 5 steps:ġ. How long is the PR interval? (Normally 0.12-0.20 sec./3-5 small squares) & what is the width of the QRS complex? (normally 0.06-0.12 sec/1.5-3 boxes). Are the R waves regular? Again, measure with calipers or a paper.ĥ. Are the P waves regular? Measure with calipers or a paper.Ĥ. (this is the atrial heart rate – remember the P wave represents the atria contracting).ģ. Are there P waves present? Count how many in 6 sec. What is the heart rate? Count how many R waves in 6 seconds (this is the ventricular heart rate – the QRS complex represents the ventricles contracting).Ģ. If you haven’t already, you may want to watch our video on basic EKG interpretation first – it goes into more detailed steps of how to read an EKG strip and is a good refresher.įirst we’ll go over a simplified 5-step approach to interpreting all EKG strips:ġ. In this video we’ll be looking at how to interpret an EKG strip, specifically atrial flutter and atrial fibrillation.
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