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Q)Which of the following most logically completes the

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Q)Which of the following most logically completes the [#permalink] New post 11 Jun 2007, 10:53
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C
D
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Q)Which of the following most logically completes the passage? Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since.....

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,
have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis
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 [#permalink] New post 11 Jun 2007, 11:40
E?
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 [#permalink] New post 11 Jun 2007, 12:06
I'd go with E, but not 100% sure. :?:
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Re: CR- Appendicitis [#permalink] New post 11 Jun 2007, 22:00
circkit wrote:
Q)Which of the following most logically completes the passage? Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since.....

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,
have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis


I can't understand the question, specially the last sentence.

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since..

Arshad Warsi, could you explain ;)
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Re: CR- Appendicitis [#permalink] New post 11 Jun 2007, 22:12
shoonya wrote:
circkit wrote:
Q)Which of the following most logically completes the passage? Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since.....

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,
have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis


I can't understand the question, specially the last sentence.

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since..

Arshad Warsi, could you explain ;)



The OA is not "E"

shoonya,
this question got me stumped too, its fairly confusing...
Question is-> doctors can avoid unnecessary removals but need not do any lesser tests than before.. since....


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 [#permalink] New post 11 Jun 2007, 22:12
go with (B)

only when the new tests makes sure that none of the patients with actual condition are misdiag. can the conclusion be satisfied.

OA ?
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 [#permalink] New post 12 Jun 2007, 00:04
Another one for (B).

The argument says

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since..

This means that all the new approch would diagnose correctly all those cases where appendicitis is present..............so it will misdiagnose only those cases where appendicitis in not there and thus appendix emoved when there is no need to.
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Re: CR- Appendicitis [#permalink] New post 12 Jun 2007, 01:02
circkit wrote:
Q)Which of the following most logically completes the passage? Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since.....

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,
have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis


IMO its A.

We have to show significance of new test in correctly.

A shows it corectly "the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis"
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Re: CR- Appendicitis [#permalink] New post 12 Jun 2007, 01:39
A: Nothing to do with the context.

B: If someone not having appendicitis is diagnosed as having it, then there is a case for unnecessary removal!

C: This does not say anything about the people who are not diagnosed with appendicitis.

D: If some other condition has symptoms overlapping with those of appendicitis, we cannot be sure if the diagnosis is correct,

E: Most logical choice. Since misdiagnosed patients lack symptoms, it may be assumed that it is due to some cause other than appendicitis. Also, since the statement says that doctors can "largely avoid", which means that unnecessary removal is not completely eliminated! Just that the percentage has to be the lowest.

Please correct me if the reasoning is flawed.
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 [#permalink] New post 12 Jun 2007, 02:45
I think B.

Even with 2% misdiagnoses, it is said that we are still performing same/more as/than before NECESSARY surgeries SINCE Misdiagnosis always leads to more surgery not less i.e. cutting up some patients who do not have the problem.
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 [#permalink] New post 12 Jun 2007, 04:19
OA is "B"
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 [#permalink] New post 12 Jun 2007, 07:04
How do we know that it only gives false positives and not instances in which it fails to diagnose appendicitis? The statement never distinguishes.
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 [#permalink] New post 06 Aug 2007, 01:20
Regarding the OAs, how are we so sure that OAs do not have any mistake?

All I want to say that I do not know who has marked the OAs. Can anybody enlighten please?
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 [#permalink] New post 06 Aug 2007, 02:29
Although I could not understand the question at first, B makes sense.

Argument is saying:
- 80% of removals are correct
- 20% of removal are wrong
Conclusion: Necessary removals will still stay the same (i.e. - that 80% case).
How come? Simple. Only if that 20% mainly involved unnecessary removals, as B says.

(B) says: Necessary removals stay the same because the misdiagnoses were cases where removals were not necessary to start with !!!!!
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 [#permalink] New post 06 Aug 2007, 07:35
It took me time to understand the question but B is straight answer as explained above by many.
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 [#permalink] New post 06 Aug 2007, 08:02
A pretty tough one..

hey guys,
How do you manage in timed conditions, the tough questions in CR esp the ones that are long and tricky worded ? Reading multiple times ..?
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 [#permalink] New post 27 Sep 2007, 08:34
This question is tricky because it mixes the concepts of performed unnecessarily, perfromed necessarily, correctly diagnosed and misdiagnosed.

For the first test,
unnecessarily and misdiagnosed:20|||necessarily and correctly:80

For the second,
misdiagnosed(do not know whether they are unnecessarily performed or not):2|||correctly(unnecessarily+necessarily): 98

If we want this part: correctly(unnecessarily+necessarily): 98 have all the necessarily performed ones, the other part must not have any necessarily performed ones, as B says.
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 [#permalink] New post 27 Sep 2007, 12:11
This is ridiculous. I still am having trouble understanding the reason behind B.

I originally tried using the same approach: i.e. 2% 98%, 20%, 80%.

Realizing that: doctors are avoiding the unnessescary removal of A's, but not decreasing the number of A's they remove....

For this kinda Q during the test: id eliminate A,C and then guess. Way too much time wasted and I still don't get it =(
  [#permalink] 27 Sep 2007, 12:11
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