| Test 4 Study Guide PEP 475 Electrocardiography Diagnosis and Localization of MI 1. What is the height/duration of a "physiological" (normal) Q wave? What causes physiological Q waves? 2. What is the height/duration for a "non-physiological" (abnormal) Q wave caused by an MI? 3. What changes do you see on the EKG when you have: -myocardial ischemia? -myocardial injury? -myocardial infarction 4. Know what events occur in the heart muscle and on the EKG during the progression of an MI. Focus on the onset of the MI through several weeks after the MI. 5. What is a transmural MI? Subendocardial MI? 6. Know the 5 major coronary arteries and what areas of the heart they feed. (Hint: Also know what areas of the heart the 12 EKG leads look at!!) 7. Know what the EKG characteristics are for: acute/old anterior MI, acute/old inferior MI, acute/old "high" and "low" lateral MI, and old posterior MI. Know what EKG leads we see each of these MI’s in. 8. What conditions (5 of them) affect the diagnosis of MI on the EKG? ST segment elevation/depression 1. What are 5 causes of ST elevation on the EKG? 2. What are the steps in the measurement of the ST segment? 3. According to Goldschlager, what 4 factors are considered when diagnosing the severity of disease when we look at the ST segment? Be able to define what each factor means in relation to severity of disease. 4. Define the terms: true positive and negative, false positive and negative. Define them by what you would see on the EKG and angiography. 5. What is sensitivity and specificity? What is the false negative and false positive rate for EKG diagnosis? What do these rates mean? |
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