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ECG

Placement of electrodes and leads

QuestionAnswer
Limb leads Placed on arms and legs with tab of electrode pointing toward the center of the body
V1 Fourth intercostal space (ICS) on the right sternal border
V2 Fourth intercostal space (ICS) on the left sternal border
V3 Midway between V2 and V4
V4 Mid-clavicular line at 5th intercostal space (ICS)
V5 Anterior axillary line at 5th ICS (horizontal to V4)
V6 Mid-axillary line at 5th ICS (horizontal to V4)
Lead I Right arm (-) to left arm (+)
Lead II Right arm (-) to left leg (+)
Lead III Left arm (-) to left leg (+)
aVR Right arm (+) and midpoint of left arm and left leg (-)
aVL Left arm (+) and midpoint of right arm and left leg (-)
aVF Left leg (+) and midpoint of right arm and left arm (-)
Rhythm strip Lead II
Right leg in ECG tracings is.... Ground lead
Usual speed of the ECG paper 25 mm/second but can be adujusted if needed due to bradycardia (decreased) or tachycardia (increased)
Standardization Usually 10 mm but can be increased or decreased (each ECG machine will have specific settings) to increase or decrease the size of the deflections on the tracing (see slides)
Holtor Monitor ECG system that monitors heart activity for 24-48 hours (see slide - remember actual hookup varies according to specific equipment)
Created by: cskinner
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