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|nextname=Step 3:Conduction intervals (PQ, QRS, QT, QTc) | |nextname=Step 3:Conduction intervals (PQ, QRS, QT, QTc) | ||
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[[Image:ECGpapier.png|thumb| The width of a square on the ECG represents time]] | [[Image:ECGpapier.png|thumb|300px| The width of a square on the ECG represents time]] | ||
[[Image:Ecgfreq.png|thumb| The count method to determine the heart frequency. 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|300px| The count method to determine the heart frequency. The second QRS complex is between ''75'' and ''60'' beat per minute. This heartbeat is between that, around 65 beats per minute.]] | ||
'''What is the heart rate?''' | '''What is the heart rate?''' | ||
To answer 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 answer 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). | ||