Journal of electrocardiology
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Respiratory artifact in the electrocardiogram usually indicates labored breathing due to compromised cardiac or pulmonary function. This case series illustrates that correlating the presence and characteristics of respiratory artifact with the ECG morphology and with changes in heart rate frequently allows us to reach specific clinical diagnoses.
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ST-segment depression in lead aVR in acute inferior wall ST-segment elevation myocardial infarction (STEMI) has recently been suggested as a predictor of left circumflex (LCx) artery involvement. The purpose of this study is to evaluate the clinical significance of aVR depression during inferior wall STEMI. ⋯ ST-segment depression in lead aVR in inferior wall STEMI predicts LCx infarction or larger RCA infarction involving a large posterolateral branch.
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We report the case of a 41-year-old man with acute myocardial infarction showing first ST elevation in V1-V6-DI-aVL leads followed by a typical V2-V4 ST depression (concomitant occlusion of proximal diagonal branch with an incomplete left anterior descending occlusion) and DII-DIII-aVF ST elevation. At coronary angiography, a proximal left anterior descending coronary stenosis with right coronary artery thrombosis was found.