51. The following patients are best treated with coronary artery bypass grafting (CABG):
A. A 60-year-old man with class II angina, 75% proximal right coronary artery lesion, and normal ventricular function.
B. A 60-year-old man with unstable angina, three-vessel disease, and an ejection fraction of 35%.
C. A 60-year-old nondiabetic man with class III angina symptoms and focal discrete lesions in the mid-right coronary artery and mid-left circumflex artery.
D. A 60-year-old man with diabetes, class IV angina, 75% proximal left anterior descending and 75% proximal right coronary artery obstruction, and left ventricular ejection fraction of 60%.
Ans: B,D
52. Sternal wound infections that spread to the mediastinum are associated with a mortality rate of:
A. 60%.
B. 30%.
C. 25%.
D. Less than 15%.
Ans: D
53. Perioperative myocardial infarction occurs following coronary bypass procedures in approximately:
A. 15%.
B. 10%.
C. 7%.
D. Less than 5%.
Ans: D
54. Following acute myocardial infarction, ventricular septal defects occur in:
A. 20%.
B. 10%.
C. 15%
D. 2% or less.
Ans: D
55. Which of the following clinical characteristics is/are associated with a higher mortality after emergency CABG for failed PTCA?
A. Multivessel disease.
B. Rescue atherectomy.
C. Cardiogenic shock prior to CABG.
D. Previous bypass surgery.
E. All of the above.
Ans: A,C,D
56. Which statement(s) about operative mortality and perioperative incidence of myocardial infarction for elective CABG (X) versus emergency CABG following failed PTCA (Y) is/are accurate?
A. The operative mortality is higher for Y but the incidence of perioperative myocardial infarction is unchanged between X and Y.
B. The operative mortality is unchanged between X and Y but the perioperative incidence of myocardial infarction is higher in Y.
C. The operative mortality and perioperative incidence is higher in X than in Y.
D. The operative mortality and perioperative incidence of myocardial infarction are no different for X and for Y.
Ans: C
57. Which of the following statements about patients treated by placement of an internal mammary artery (IMA) bypass graft at primary CABG is/are correct?
A. The risk for morbidity and mortality from reoperative coronary bypass grafting is increased.
B. Left ventricular function is better preserved at the time of reoperation.
C. The risk of sternal wound complications is greatly increased if the contralateral IMA is harvested at the time of reoperation.
D. A light clamp should be applied to the IMA pedicle to limit cardiac warming during cardioplegic arrest at the time of reoperation.
E. A functional study demonstrating a large portion of myocardium at risk should be obtained before reoperation.
Ans: B,D,E
58. Considering the results of coronary reoperation in comparison to primary CABG, choose the incorrect statement:
A. Operative morbidity and mortality are increased over those for primary CABG.
B. Mortality most often stems from cardiac causes after reoperation.
C. Survival of patients after hospital discharge following coronary reoperation is nearly equivalent to survival after primary CABG.
D. Compared to primary CABG, return of anginal symptoms is delayed after reoperative CABG.
E. Myocardial protection and the risk of myocardial infarction in reoperation are complicated by increased noncoronary collaterals, patent atherosclerotic saphenous vein grafts, and more diffuse coronary atherosclerosis.
Ans: D
59. Which statements are correct comparisons of gated equilibrium and initial-transit radionuclide measurements of left ventricular function?
A. Gated equilibrium techniques provide more accurate measurements of ejection fraction than initial-transit methods.
B. Left ventricular imaging time for a gated equilibrium study is at least 10 times that of an initial-transit study.
C. Both techniques require the same radiopharmaceuticals.
D. Both techniques require a bolus injection.
Ans: B
60. The radionuclide variable that contains the greatest amount of prognostic information in patients with coronary artery disease is:
A. Exercise ejection fraction.
B. Change in regional wall motion from rest to exercise.
C. Maximal cardiac output during exercise.
D. Change in heart rate during exercise.
Ans: A
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A. A 60-year-old man with class II angina, 75% proximal right coronary artery lesion, and normal ventricular function.
B. A 60-year-old man with unstable angina, three-vessel disease, and an ejection fraction of 35%.
C. A 60-year-old nondiabetic man with class III angina symptoms and focal discrete lesions in the mid-right coronary artery and mid-left circumflex artery.
D. A 60-year-old man with diabetes, class IV angina, 75% proximal left anterior descending and 75% proximal right coronary artery obstruction, and left ventricular ejection fraction of 60%.
Ans: B,D
52. Sternal wound infections that spread to the mediastinum are associated with a mortality rate of:
A. 60%.
B. 30%.
C. 25%.
D. Less than 15%.
Ans: D
53. Perioperative myocardial infarction occurs following coronary bypass procedures in approximately:
A. 15%.
B. 10%.
C. 7%.
D. Less than 5%.
Ans: D
54. Following acute myocardial infarction, ventricular septal defects occur in:
A. 20%.
B. 10%.
C. 15%
D. 2% or less.
Ans: D
55. Which of the following clinical characteristics is/are associated with a higher mortality after emergency CABG for failed PTCA?
A. Multivessel disease.
B. Rescue atherectomy.
C. Cardiogenic shock prior to CABG.
D. Previous bypass surgery.
E. All of the above.
Ans: A,C,D
56. Which statement(s) about operative mortality and perioperative incidence of myocardial infarction for elective CABG (X) versus emergency CABG following failed PTCA (Y) is/are accurate?
A. The operative mortality is higher for Y but the incidence of perioperative myocardial infarction is unchanged between X and Y.
B. The operative mortality is unchanged between X and Y but the perioperative incidence of myocardial infarction is higher in Y.
C. The operative mortality and perioperative incidence is higher in X than in Y.
D. The operative mortality and perioperative incidence of myocardial infarction are no different for X and for Y.
Ans: C
57. Which of the following statements about patients treated by placement of an internal mammary artery (IMA) bypass graft at primary CABG is/are correct?
A. The risk for morbidity and mortality from reoperative coronary bypass grafting is increased.
B. Left ventricular function is better preserved at the time of reoperation.
C. The risk of sternal wound complications is greatly increased if the contralateral IMA is harvested at the time of reoperation.
D. A light clamp should be applied to the IMA pedicle to limit cardiac warming during cardioplegic arrest at the time of reoperation.
E. A functional study demonstrating a large portion of myocardium at risk should be obtained before reoperation.
Ans: B,D,E
58. Considering the results of coronary reoperation in comparison to primary CABG, choose the incorrect statement:
A. Operative morbidity and mortality are increased over those for primary CABG.
B. Mortality most often stems from cardiac causes after reoperation.
C. Survival of patients after hospital discharge following coronary reoperation is nearly equivalent to survival after primary CABG.
D. Compared to primary CABG, return of anginal symptoms is delayed after reoperative CABG.
E. Myocardial protection and the risk of myocardial infarction in reoperation are complicated by increased noncoronary collaterals, patent atherosclerotic saphenous vein grafts, and more diffuse coronary atherosclerosis.
Ans: D
59. Which statements are correct comparisons of gated equilibrium and initial-transit radionuclide measurements of left ventricular function?
A. Gated equilibrium techniques provide more accurate measurements of ejection fraction than initial-transit methods.
B. Left ventricular imaging time for a gated equilibrium study is at least 10 times that of an initial-transit study.
C. Both techniques require the same radiopharmaceuticals.
D. Both techniques require a bolus injection.
Ans: B
60. The radionuclide variable that contains the greatest amount of prognostic information in patients with coronary artery disease is:
A. Exercise ejection fraction.
B. Change in regional wall motion from rest to exercise.
C. Maximal cardiac output during exercise.
D. Change in heart rate during exercise.
Ans: A
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