6 second method ecg

The term "heart rate" normally refers to the rate of ventricular contractions.

Formula how to calculate heart rate

However, because there are circumstances in which the atrial and ventricular rates differ (e.g., second and third degree AV block), it is important to determine both atrial and ventricular rates. This is easily done by examining an ECG rhythm strip, which is usually taken from a single lead (e.g., Lead II). In the example below, there are four numbered R waves, each of which is preceded by a P wave.

Therefore, the atrial and ventricular rates will be the same because there is a one-to-one correspondence. Atrial rate can be determined by measuring the time intervals between P waves (P-P intervals). Ventricular rate can be determined by measuring the time intervals between the QRS complexes, which is done by looking at the R-R intervals.

There are different short-cut methods that can calculate rates, all of which assume a recording speed of 25 mm/sec, which corresponds to 5 large squares (dark red boxes) in the ECG recording.

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how to measure pulse rate in ecg

how to calculate the heart rate in ecg