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26 bytes added, 08:01, 30 May 2009
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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.
 {| class="wikitable" font-size="90%" align="leftcenter"
|+'''The 'square counting' method can be fine-tuned with the following sequence'''
* Cardiac filling increases the frequency.
* Also [[arrhythmias]] influence heart rate.
[[Category:ECG Course]]


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