g****g
发帖数: 411 | 1 Please give your opinion and explanation, thanks in advance.
Question:
You are reading a study assessing whether ECG during graded treadmill
exercise stress testing can predict clinically significant(75% or more)
coronary artery stenosis as shown by arteriography(the gold standard). The
subjects are men, ages 55 to 75 years, with chest pain who were referred to
a cardiac center. Prevalence of greater than 75% stenosis in the study group
was 53%. Results of the study are as follows:
Sensitivity = 53% Positive predictive value = 89%
Specificity = 92% Negative predictive value = 63%
The authors concluded:" In men, a positive multistage stress test is highly
predictive of the presence of significant coronary artery disease, but a
negative stress test does not reliably rule out significant disease." You
consider how exercise stress testing could be used to diagnose clinically
significant coronary artery disease in patients in our practice. In a 30-
year-old man with chest pain, an exercise stress test would be likely to
have which of the following features?
A) Higher negative predictive value
B) Higher sensitivity
C) Higher specificity
D) Lower positive predictive value
E) Lower specificity
Please help! | e*****3
发帖数: 27 | 2 In a low prevalence situation, PV− increases, while PV+ decreases. A
or D?
The test has high specificity (92%) →very high PV+, will not be greatly
affected by prevalence?
Is the answer A? 欢迎大家讨论 | T****g
发帖数: 705 | 3 实验数据是出自55-75岁人群的，
不适用于这个30岁病人。
问题就可以简略为
In a 30-year-old man with chest pain, an exercise stress test would be
likely to
have which of the following features?
我会选 E
等楼主给答案和解释 | g****g
发帖数: 411 | 4 Please give your opinion and explanation, thanks in advance.
Question:
You are reading a study assessing whether ECG during graded treadmill
exercise stress testing can predict clinically significant(75% or more)
coronary artery stenosis as shown by arteriography(the gold standard). The
subjects are men, ages 55 to 75 years, with chest pain who were referred to
a cardiac center. Prevalence of greater than 75% stenosis in the study group
was 53%. Results of the study are as follows:
Sensitivity = 53% Positive predictive value = 89%
Specificity = 92% Negative predictive value = 63%
The authors concluded:" In men, a positive multistage stress test is highly
predictive of the presence of significant coronary artery disease, but a
negative stress test does not reliably rule out significant disease." You
consider how exercise stress testing could be used to diagnose clinically
significant coronary artery disease in patients in our practice. In a 30-
year-old man with chest pain, an exercise stress test would be likely to
have which of the following features?
A) Higher negative predictive value
B) Higher sensitivity
C) Higher specificity
D) Lower positive predictive value
E) Lower specificity
Please help! | e*****3
发帖数: 27 | 5 In a low prevalence situation, PV− increases, while PV+ decreases. A
or D?
The test has high specificity (92%) →very high PV+, will not be greatly
affected by prevalence?
Is the answer A? 欢迎大家讨论 | T****g
发帖数: 705 | 6 实验数据是出自55-75岁人群的，
不适用于这个30岁病人。
问题就可以简略为
In a 30-year-old man with chest pain, an exercise stress test would be
likely to
have which of the following features?
我会选 E
等楼主给答案和解释 | o**********w
发帖数: 17 | 7 D, specifi, sensen都是不改变的，唯一改变的是PPV，NPV.
prevalent变小的话，PPV降低，NPV升高，
现在是病人体检是+性表现，所以问的是PPV，而不是NPV。
这个题目好诡异，绕弯的厉害。 |
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