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Unformatted text preview: BME 301 Name: Practice Exam 3 April 24, 2004 The exam consists of 12 questions. Show all work to receive credit. Good Luck! Problem 1 (5): Problem 2 (10): Problem 3 (10): Problem 4 (10): Problem 5 (10): Problem 6 (5): Problem 7 (10): Problem 8 (5): Problem 9: (10): Problem 10 (5): Problem 11 (10): Problem 12 (10): Total (100): 1. Name three risk factors for cardiovascular disease that were discussed in class. Any three of the following: Tobacco use Low levels of physical activity Inappropriate diet High blood pressure High cholesterol 2. When a sphygmomanometer is used to measure blood pressure, what two values are measured? Describe how the sphygmomanometer is used to perform these measurements. The systolic pressure and the diastolic pressure are the values measured. The inflatable cuff is placed on the upper arm. The cuff pressure is increased until it is higher than the systolic pressure, so that blood flow into the arm stops. The pressure is gradually released by opening a valve. When the cuff pressure equals the systolic pressure, blood begins to flow and the Korotkoff sound associated with turbulent blood flow is heard with the stethoscope. When the cuff pressure equals the diastolic pressure, the artery is no longer compressed and the Korotkoff sound is no longer heard. 3. If a persons cardiac output is 5.5 L/minute at a heart rate of 75 beats/minute, what is the stroke volume in mL? How many seconds will it take for this persons entire 4.9-Liter volume of blood to be pumped through the heart? CO = HR x SV SV = CO/HR = (5.5 L/minute) / (75 beats/minute) = 0.073 L = 73 mL per beat (4.9 L) / (5.5 L/minute) = 0.89 minutes = 53.5 seconds 4. Explain why it is important to consider additive procedures when analyzing the cost effectiveness of new medical technologies. Give a specific example that was discussed in class in which additive procedures influenced cost effectiveness. A new technology may be used in addition to an existing procedure, rather than replacing it. Use of the new technology therefore may not lead to the overall cost savings that were originally anticipated. For example, among heart patients who have had PTCA, 20-40% have a second PTCA within 5 years, and 25% have CABG within 5 years. This reduces the cost savings advantage of PTCA over CABG....
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This note was uploaded on 04/25/2008 for the course BIOE 301 taught by Professor Richards-kortum during the Spring '08 term at Rice.
- Spring '08