# Exam 3 with Answers 2004 - BME 301 Exam 3 Name The exam...

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BME 301 Name: Exam 3 April 29, 2004 The exam consists of 10 questions. Show all work to receive credit. Good Luck! Problem 1 (10): Problem 2 (10): Problem 3 (10): Problem 4 (10): Problem 5 (10): Problem 6 (10): Problem 7 (10): Problem 8 (10): Problem 9: (10): Problem 10 (10): Extra Credit: Total (100):

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1. In our unit on heart failure, we considered what happens to the ejection fraction as disease progresses. a. What is the ejection fraction? The ejection fraction (EF) is the fraction of blood pumped out of the ventricle with each heart beat (stroke volume, SV) divided by the total volume at the end of diastole (EDV) EF = SV/EDV b. What is a normal value for the ejection fraction? Normal value > 60% c. How does the ejection fraction change as heart failure develops? The EF decreases as heart failure develops. d. How do we measure the ejection fraction? The EF is measured using echocardiography. 2. Heart disease typically develops over a period of decades. a. Describe two approaches to prevent the development of heart disease. Control high blood pressure through diet, lifestyle, drugs Control high cholesterol through diet, lifestyle, drugs b. Has our society focused on prevention of disease or treatment of disease? Should this change? Our society has focused on treatment. This should change; new studies show that a focus on prevention could be more effective and cost-effective
3. The heart lung machine was developed in the 1950s. It enabled many types of cardiac surgery which were previously impossible. a. Describe the function of a heart-lung machine. The heart-lung machine takes over the function of the heart and lungs during open heart surgery. It consists of a chamber that receives the blood from the body. Blood is pumped by machine through an oxygenator. The oxygenator removes CO2 and adds oxygen. The pump then pumps this newly oxygenated blood back to the body. The machine is connected to patient by a series of tubes. b. What is the major disadvantage of using the heart-lung machine? pump head – memory loss and loss of mental clarity due to oxygen deprivation to the brain. c. What are two new technologies which eliminate the need for use of the heart lung machine? Off-pump CABG where surgery is performed on the beating heart. Closed pump CABG where surgery is performed endoscopically on the beating heart. 4. You are working in the emergency room, when Mr. Solomon comes in with chest pain of one hour duration. Mr. Solomon describes the pain as being severe and "like someone was sitting on my chest." The pain, located "in the lower part of my breast bone," awakened him from his sleep. Although he tried to relieve the pain by changing positions in bed, sitting up and drinking water,

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Exam 3 with Answers 2004 - BME 301 Exam 3 Name The exam...

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