Learn by measuring

Real paper, exact calipers, and an answer key for every strip. Each stage adds one skill, and no rhythm gets a name until you have measured your way to it.

The paper

Boxes, speed, gain, and the calibration pulse. Everything else is built on this.

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Time and voltage

Convert a caliper span to milliseconds and millivolts at half-box precision.

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Rate

The 300 method, the 1500 method, and reading rate straight off an RR.

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Regularity

March the calipers down the strip and decide whether the rhythm is regular.

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Waves

Find the onset and offset of the P wave, the QRS, and the T wave.

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Intervals

PR, QRS, QT and QTc, and whether each is normal for the species.

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Axis

The quadrant method on leads I and aVF, then the isoelectric lead, then a number.

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The systematic read

Rate, regularity, P waves, PR, QRS, then and only then a name.

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