Respiratory System Discussion

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1. What do the ECG and the blood levels of creatine phosphokinase-2 and troponin-I tell you about the likelihood that Barbara had a heart attack? 2. Why are Barbara’s arterial PO2, PCO2, and pH v... alues different from normal? 3. Are your ideas consistent with her blood pressure and heart rate? 4. What conditions cause contraction of the bronchiole smooth muscle or pulmonary arteriole smooth muscle? 6. Why did the doctor ask for a CT scan and ultrasound of Barbara’s legs? 7. With Barbara’s symptoms in mind, and the tests that were performed, do you wish to speculate about her condition? answers 1. In Heart attack or myocardial infarction, the most common ECG changes would be the ST elevation or depression of the PR segment. The position or the indicator which artery is affected depends on what leads were affected. The most common site of MI is the LAD, hence an ST elevation on lead I, and aVL can be seen. There are instances wherein there are different arteries are blocked, hence the lead changes. Troponin I elevates due to cardiac injury, therefore in MI, it is expected to rise. Creatine phosphokinase 2 (CK) is also elevated in MI, but note that CK is not specific for MI. [Show More]

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