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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]]
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