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# Non regular rhytms 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 rhytms 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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{| font-size="90%" align="right" border="0" | {| style="wikitable" font-size="90%" align="right" border="0" | ||
|- style="text-align:center;background-color:#6EB4EB;" | |- style="text-align:center;background-color:#6EB4EB;" | ||
|+'''The 'square counting' method can be finetuned with the following sequence''' | |+'''The 'square counting' method can be finetuned with the following sequence''' | ||