Cardiac Angiography EKG Electrode Placement: Standard 12-Lead Positions

Precise electrode placement ensures accurate ECG during cardiac angiography:

Lead	Position
RA (Right Arm)	High on right sternal border, 3rd–4th intercostal space
LA (Left Arm)	High on left sternal border, 3rd–4th intercostal space
RL (Right Leg)	Right ankle or lower leg (ground)
LL (Left Leg)	Left ankle or lower leg
V1	Right sternal border, 4th intercostal space
V2	Left sternal border, 4th intercostal space
V3	Midway between V2 and V4
V4	Left midclavicular line, 5th intercostal space
V5	Left anterior axillary line, 5th intercostal space
V6	Left midaxillary line, 5th intercostal space

Clean skin, ensure good contact, and verify lead labels. Misplacement alters axis and morphology, risking misdiagnosis.