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<mark class="QVRyCf">An electrocardiogram (ECG or EKG) is a key test for diagnosing myocardial infarction (MI)</mark>. An ECG records electrical activity in the heart as a wave pattern, and abnormalities in the ST segment, T wave, and QRS complex can indicate MI. However, an ECG may be normal or nonspecific in some patients.<span class="UV3uM"> </span>
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<span role="heading" aria-level="2">Here are some ways an ECG can help diagnose MI:</span><span class="UV3uM"> </span>
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<div class="Gur8Ad">ST-segment elevation</div>
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An ECG with ST-segment elevation has a 90% specificity and 45% sensitivity for diagnosing MI. ST elevation MI (STEMI) requires immediate coronary intervention, so a rapid assessment of the patient and ECG is important.<span class="UV3uM"> </span>
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<div class="Gur8Ad">Serial tracings</div>
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Serial tracings taken every 8 hours for a day, then daily, can help confirm a diagnosis. A gradual evolution toward a more normal pattern or development of abnormal Q waves over a few days can be a sign of MI.<span class="UV3uM"> </span>
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<div class="Gur8Ad">Right ventricular infarction</div>
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If right ventricular (RV) infarction is suspected, a 15-lead ECG can be used. Additional leads are placed at V4-6R to detect RV infarction, and V8 and V9 to detect posterior infarction.<span class="UV3uM"> </span>
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<span role="heading" aria-level="2">Other tests that can help diagnose MI include:</span><span class="UV3uM"> </span>
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 	<li class="PZPZlf" data-attrid="SGEListItem">Echocardiography: Uses sound waves to create an image of the heart's internal structure<span class="UV3uM"> </span>
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