jdobbs Posted February 5, 2013 Share 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. Link to comment Share on other sites More sharing options...
flyingsquirrel Posted February 5, 2013 Share 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/ Link to comment Share on other sites More sharing options...
jdobbs Posted February 5, 2013 Author Share Posted February 5, 2013 Excellent site. My EKG mentions nothing of this. Thanks a lot! Link to comment Share on other sites More sharing options...
flyingsquirrel Posted February 5, 2013 Share 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. Link to comment Share on other sites More sharing options...
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