a) Limb leads
eg: - bipolar (MMII)
- unipolar (aVR, aVL, aVF)
b) Precordial leads
eg: - standard unipolar (V1-V6)
- non-standard unipolar (V7-V9)
• rigftt - ventricle unipolar (V1R-V6R)
eg: - 25mm/s: 1mm=0.04s=40ms & 5mm=0.2s=200ms • 50mm/s: 1mm=0.02s=20ms & 5mm=0.1s=100ms
b) Frequency of the heart
eg: - 25mm/s: 1500:RR(mm) - 25mm/1sek X 60 sek*1500/1min