EKG Week 1
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Lead *MCL 1
• Variation of precordial
lead V 1
• MCL 1 - Negative
electrode below L
clavicle & positive
electrode R of sternum,
4th intercostal space
• Main depolarization
wave is away from
positive electrode, so
QRS appears negative
MCL 1
Lead
Summary
with EKG
Rhythm
Strips
ECG Paper
Vertical Axis = Voltage/Amplitude (mm)
– Small squares = 1 mm high, 1 mm wide
– Large squares = 5 mm high, 5 mm wide
ECG Paper
Horizontal Axis = Time
– Small box = 0.04 second (40 millisec, ms)
– Large box = 0.20 second (200 millisec, ms)
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