Lead V1 location

4th ICS, RSB

Lead V2 location

4th ICS, LSB

Lead V3 location

5th ICS, between V2 and V4

Lead V4 location

5th ICS, L Midclavicular Line

Lead V5 location

5th ICS, L Anterior Axillary Line

Lead V6 location

5th ICS, L Midaxillary Line

Lead 1 +

L arm

Lead 2 +

L leg

Lead 3 +

L leg

Lead 3 -

L arm

Lead 2 -

R arm

Lead 1 -

R arm

Lead aVR +

R arm

Lead aVL +

L arm

Lead aVF +

L leg

- poles in augmented leads

central terminal

- poles in precordial leads

central terminal

+ electrode

perspective that is looked from in all leads

White lead wire

R arm/subclavicular fossa

Black lead wire

L arm/cubclavicular fossa

Red lead wire

L leg/L lower torso

Green lead wire

R leg/R lower torso

Ground wire

Green wire/R leg/R lower torso

Heart Contraction

depolarization

Heart Relaxation

repolarization

Charge of resting cell

-

Charge of depolarized cell

+

Contraction term

systole

Relaxation term

diastole

Lead for a rhythm strip

lead 2

Anterior of Heart

V1,V2,V3,V4

Lateral Wall

1,aVL,V5,V6

Inferior Wall

2,3,aVF

CA brings blood to inferior wall

R main

CA brings blood to lateral wall

circumflex

CA brings blood to anterior wall

anterior descending

Limb Leads

1,2,3,aVF,aVR,aVL

Precordial leads

V1-V6

Bipolar leads

1,2,3

Unipolar leads

aVF,aVR,aVL,V1-V6

speed of EKG printing

25mm/sec

setting of EKG spaces

50mm/sec

sensitivity of EKG

10mm/mV

Sensitivity or

Gain

standard gain

1

10 electrodes and lead wires

12 lead and stress test

5 electrodes and lead wires

holter and telemetry

at home, long time

holtor and event monitoring

heart response to tachycardia

stress test

3 electrodes and lead wires

continuous monitoring