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;Definition of a pathologic Q wave
 
;Definition of a pathologic Q wave
 
:Any Q-wave in leads V2–V3 >= 0.02 s or QS complex in leads V2 and V3
 
:Any Q-wave in leads V2–V3 >= 0.02 s or QS complex in leads V2 and V3
:Q-wave >= 0.03 s and > 0.1 mV deep or QS complex in leads I, II, aVL, aVF, or
+
:Q-wave >= 0.03 s and > 0.1 mV deep or QS complex in leads I, II, aVL, aVF, or V4–V6 in any two leads of a contiguous lead grouping (I, aVL,V6; V4–V6; II, III, and aVF)
V4–V6 in any two leads of a contiguous lead grouping (I, aVL,V6; V4–V6; II, III,
  −
and aVF)*
   
:R-wave >= 0.04 s in V1–V2 and R/S > 1 with a concordant positive T-wave in the
 
:R-wave >= 0.04 s in V1–V2 and R/S > 1 with a concordant positive T-wave in the
 
absence of a conduction defect
 
absence of a conduction defect

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