jdobbs Posted February 5, 2013 Hey guys... I'm trying to figure out how the lead angles of orientation work. Lead I is pretty easy. Right arm (-), left arm (+) equals angle of orientation zero degrees Lead II makes sense too. Right arm (-), left leg (+) equals angle of orientation of +60 degrees Now, Lead III is where I get lost. Left arm (-), left leg (+)....how does that create an angle of +120??? In my simple mind, lead III would create and angle of +90 to +100, depending on left leg lead placement. I have attached a picture of einthoven's triangle that shows my train of thought, however, notice the diagram on the left shows the angle back at +120.
flyingsquirrel Posted February 5, 2013 The axis of each lead refers to the electrical orientation, not anatomical. Tom Bouthillet's EMS12-lead blog has a great tutorial on all things axis... http://ems12lead.com/2008/10/axis-determination-part-i/
flyingsquirrel Posted February 5, 2013 No problem...I'm not sure what EKG book your program uses, but I've been through several, and by far my favorite is Garcia and Holtz, 12-lead ECG: The Art of Interpretation.
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