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'''There are three simple methods to determine the | '''There are three simple methods to determine the heart frquency (HF):''' | ||
# Count the small (1mm) squares between two QRS-complexes. Hense, the ECG paper runs with 25 mm/sec through the ECG writer, therefore: [[Image:HFformule_en.png]]This method works well in case of tachycardia (>100 beats/minute)<br> | # Count the small (1mm) squares between two QRS-complexes. Hense, the ECG paper runs with 25 mm/sec through the ECG writer, therefore: [[Image:HFformule_en.png]]This method works well in case of tachycardia (>100 beats/minute)<br> | ||
# To determine the frequency of a normal sinus ritme: Use the sequence 300-150-100-75-60-50-43-37. Count from the first QRS complex, the first thick line is 300, the next line 150 etc. Stop the sequence at the next QRS complex. When the second QRS complex is in between two lines, take the mean of the two numbers from the sequence or use the finetune method listed to the right. | # To determine the frequency of a normal sinus ritme: Use the sequence 300-150-100-75-60-50-43-37. Count from the first QRS complex, the first thick line is 300, the next line 150 etc. Stop the sequence at the next QRS complex. When the second QRS complex is in between two lines, take the mean of the two numbers from the sequence or use the finetune method listed to the right. | ||