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# Non regular rhythms are best determined with the "3 second marker method" Count the number of QRS complexes that fit in 3 seconds (some ECG writers register this period on the ECG paper). Multiply this number by 20 and find the number of beats/minute. | # Non regular rhythms are best determined with the "3 second marker method" Count the number of QRS complexes that fit in 3 seconds (some ECG writers register this period on the ECG paper). Multiply this number by 20 and find the number of beats/minute. | ||
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|+'''The 'square counting' method can be fine-tuned with the following sequence''' | |+'''The 'square counting' method can be fine-tuned with the following sequence''' | ||
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* Cardiac filling increases the frequency. | * Cardiac filling increases the frequency. | ||
* Also [[arrhythmias]] influence heart rate. | * Also [[arrhythmias]] influence heart rate. | ||
[[Category:ECG Course]] | |||