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heart rhythms

Using the 6 Second Method
Draw two lines on the ECG trace. The first line should be near the left-hand side
of the paper containing the ECG trace; the second line should be exactly 30 large
squares subsequent to the first line. 30 large squares on an ECG trace represents
exactly 6 seconds.[9]
Count the number of QRS complexes between the two lines.[10] As a reminder,
the QRS complex is the tallest peak of each wave form that represents one heart
beat. Tally up the total number of QRS complexes between your two lines and
write down this number.
Multiply your answer by 10.[11] Because 6 seconds x 10 = 60 seconds,
multiplying your answer by 10 will give you the number of heart beats that have
occurred in one minute (in other words, the "beats per minute," which is the
standard measurement of heart rate). For example, if you count 8 beats in the 6
second period, then your heart rate calculation gives you 8 x 10 = 80 beats per
Understand that this method is particularly effective for irregular heart
rhythms. If the heart rate is regular, the first method of simply determining the
distance between one QRS and the next can be very effective, because the
distance between all the QRS complexes is presumably the same with a regular
heart rate. On the other hand, with an irregular heart rate (where the QRS
complexes are not at regular distances from one another), the 6 second method
works better because it averages the distance between heart beats, giving a
more accurate overall number.[12]