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18 bytes added ,  15 August 2007
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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'''
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