<prompt> ECG is poor detecting ischemia in areas supplied by wich of the following vessels-Left anterior descending LADLeft circumflex LCxLeft Coronary Aery LCARight Coronary Aery RCA  <response>: Occlusion in the left circumflex aery ECG changes resemble those seen in posterior infarction due to occlusion in the RCA, namely ST-segment elevations in V7-V9 and reciprocal ST-segment depressions in V1-V3, along with high R-waves and positive T-waves in the same leads V1-V3.but it is poorly detected on ECG Ref Davidson edition23rd pg 460 