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      Transient QRS Axis Shift to the Right during Right Coronary Artery and/or Left Circumflex Artery Spasms

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          Abstract

          The QRS axis was measured in 24 patients during ergonovine malate provocation test (EM test). Of 12 patients with significant spasm of the right coronary artery (RCA) and/or left circumflex artery (LCX), the QRS axis shifted to the right in 7 patients after the EM test (mean 8.2°), and the axis shifted back to the left in 9 patients after nitroglycerin administration (mean – 9.1 °). The sensitivity of right axis shift for RCA and LCX spasm was 58% and the specificity was 80%. Thus, right axis shift seems to be associated with myocardial ischemia due to RCA and LCX spasm and to be useful for the detection of RCA and/or LCX spasms.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1989
          1989
          11 November 2008
          : 76
          : 3
          : 222-227
          Affiliations
          aFirst Department of Internal Medicine, Tottori University School of Medicine, and bDepartment of Internal Medicine, San-in Rosai Hospital, Yonago, Japan
          Article
          174494 Cardiology 1989;76:222–227
          10.1159/000174494
          2776142
          © 1989 S. Karger AG, Basel

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          Page count
          Pages: 6
          Categories
          Case Report

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