aVR

aVR: Importance (mostly ignored, why)
In theory, aVR looks at the R upper side of the heart (RV outflow tract and basal septum). In practice, aVR is only regarded as a reciprocal reflexion of the L lateral side of the heart which is already covered by aVL, II, V5, 6 = therefore ignored

• sinus rhythm
• origin of arrhythmia: (+) P wave = SVT; (-) P wave = VT (note: P wave is hard to find in WCT, besides, it can also be mistaken for artifact)
  check AVR Algorithm
  
• unstable angina + at least 8 leads of ST changes + ST elevation aVR = LMCA or TVD
• PE: ST elevation (RV overload)
  
• proximal LAD
• TCA poisoning, upright aVR
• pericarditis: PR elevation (+ PR depression the rest of the leads