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25 Cards in this Set
- Front
- Back
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What do you need for an acute MI to be present
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T wave inversion
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In a study of perioperative Ischemia, what % of patients had ST segment changes
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41%
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Classically noted as ST changes
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Myocardial Injury
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Classically noted as Q wave changes
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Myocardial infarction
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Classically noted as symmetrical T wave changes
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Myocardial ischemia
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Injury or infarction of only the inner half of the heart wall
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subendocardial ischemia
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Injury or infarction that involves only a superficial portion of the outer ventricle
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Subepicardial ischemia
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Ischemia, injury or infarction involving the full thickness of the ventricle
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Transmural
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occurs when an acute vessel occlusion subsequently reopens and reperfuses the myocardium
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stunned myocardium
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occurs when there is a chronic reduction in blood flow. (decreased EF)
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Hibernating myocardium
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can occur when the stunned or hibernating myocardium suddenly is restored with high blood flow
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reperfusion injury
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Short repeated episodes of ischemia that do not result in cumulative damage, but instead protect the heart from subsequent damage caused by larger ischemic insults
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preconditioning
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Refers to inotropy or the inability to contract. results in an increase in compliance (heart dilates)
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systolic dysfunction
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develops most often d/t "supply ischemia"
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systolic dysfunciton
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develops most often d/t "demand ischemia"
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diastolic dysfunction
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**80% of ischemia occurs when?
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postop
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**What leads show "inferior side of heart"
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V2-3, AVF
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**What leads show "Lateral side of heart"
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V1, AVL, V5-6
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**What leads show "septal and anterior leads"
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V1-V4
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What 2 leads are best for monitoring for Ischemia
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V5
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**What 2 leads are best for detecting dysrhythmias
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MCL1 and II
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ST or T wave changes > 1mm =
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possible ischemia
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Indicative changes that point to ischemic/infarcted tissue =
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-inverted T waves
-Elevated ST segment -Abnormal Q-waves or loss of R wave amplitude |
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**St segment depression >/= 1mm is indicative of
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classic subendocardial injury
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**ST segment elevation >/= to 1mm is indicative of
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Classic transmural injury
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