Jam with Confidence: Rock Your Certified Rhythm Analysis Technician Exam 2026!

Counting small squares between R-R intervals is a fundamental method for interpreting heart rhythm in an ECG. This technique involves measuring the distance between consecutive R waves, which represent the peak of the QRS complex, where ventricular depolarization occurs. By counting the number of small squares on the ECG paper between these R-R intervals, you can quickly determine the heart rate and assess whether the rhythm is regular or irregular.

In a standard ECG, each small square typically represents 0.04 seconds. Therefore, by counting the squares between R-R intervals and applying the appropriate calculations, you can calculate the ventricular rate. A consistent R-R interval indicates a regular rhythm, whereas varying intervals suggest an irregular rhythm, which could be clinically relevant for diagnosis.

This method is a basic yet crucial skill for any technician interpreting ECGs, as it lays the foundation for identifying various arrhythmias and understanding the overall cardiac rhythm pattern.