1. Negative P wave in V1 Is the Key to Identifying High Placement of V1-V2 Electrodes in Nonpathological Subjects 
Javier García-Niebla, RN 
The American Journal of Medicine 
Volume 125, Issue 9, Pages e9-e10 (September 2012)
DOI: /j.amjmed
Copyright © 2012 Elsevier Inc. Terms and Conditions

2. Figure
V1 and V2 recordings in a healthy 45-year-old man. With proper lead placement, the P wave is positive in V1-V2 (A). However, on moving the leads up to the 3rd intercostal space, the P wave in V1 is predominantly negative and in V2 has a negative component. This identifies lead-positioning error (B). With leads placed on the 2nd intercostal space, the negative P wave in V1 together with rSr' morphology alerts us to high V1-V2 placement (C).
The American Journal of Medicine  , e9-e10DOI: ( /j.amjmed )
Copyright © 2012 Elsevier Inc. Terms and Conditions