Smarter Medicine in a Snap

The Lead Reversal Nightmare

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Normal Leads	RA/LA	RA/LL	LA/LL	RL/RA	RL/LA	RL/LL	RA→ LA→ LL→ RA	RA→ LL→ LA→ RA	RA/RL + LA/ LL	RA/LA + LL/RL
I	-I	-III	II	-III	II	I	III	-II	0	-I
II	III	-II	I	0	II	II	-I	-III	-III	III
III	II	-I	-III	III	0	III	-II	I	-III	III
aVR	aVL	aVF	aVR	aVR=aVF	-II	aVR	aVL	aVF	aVR=aVL	aVL
aVL	aVR	aVL	aVF	-III	aVL=aVF	aVL	aVF	aVR	aVR=aVL	aVR
aVF	aVF	aVR	aVL	aVR=aVF	aVL=aVF	aVF	aVR	aVL	-III	aVF
V1-V6	No Change in leads I, II, III, aVR, aVL, aVF. R/S wave amplitude change unexpectedly in the switched leads.

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