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[[Image:ECGpapier.png|thumb| The width of a square on the ECG represents time]] | [[Image:ECGpapier.png|thumb| The width of a square on the ECG represents time]] | ||
[[Image:Ecgfreq.png|thumb| The countmethod to determine the heartfrequency. The second QRS-complex is between ''75'' and ''60'' beat per minute. This heartbeat is between that, around 65 beats per minute.]] | [[Image:Ecgfreq.png|thumb| The countmethod to determine the heartfrequency. The second QRS-complex is between ''75'' and ''60'' beat per minute. This heartbeat is between that, around 65 beats per minute.]] | ||
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|+'''The 'square counting' method can be finetuned with the following sequence''' | |||
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|'''300'''||250||214||187||167||'''150'''||136||125||115||107||'''100'''||94||88||83||79||'''75'''||71||68||65||62||'''60''' | |||
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To anwer this question, determine the time between two QRS complexes. Previously, the ECG was registered on a paperstrip transported through an ECG writer at the speed of 25 mm/second. Nowadays, digital ECG registration is common however, the method of determining the frequency remains the same. The ECG paper has a grid with thick lines 5 mm apart (= 0,20 second) and thin lines 1 mm (0,04 second). | To anwer this question, determine the time between two QRS complexes. Previously, the ECG was registered on a paperstrip transported through an ECG writer at the speed of 25 mm/second. Nowadays, digital ECG registration is common however, the method of determining the frequency remains the same. The ECG paper has a grid with thick lines 5 mm apart (= 0,20 second) and thin lines 1 mm (0,04 second). | ||
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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. | ||
{{clr}} | {{clr}} | ||