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Appendicitis (inflammation of the appendix) is potentially

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Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 11 May 2010, 05:59
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A
B
C
D
E

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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
[Reveal] Spoiler: OA

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 11 May 2010, 08:00
IMO B
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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 11 May 2010, 09:41
hmm i dont get this can someone explain ?

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 11 May 2010, 09:48
IMO its A.

Please correct me if you find the below description incorrect.


The new surgery has eliminated the unnecessary removal of appendicix because of its 98% accuracy rate. According to the last sentence - as a result of the new test doctors correctly identify the patients with appendix and leave out those which dont have it. We have to prove here that when the new test results say that a person doesnt have appendix they are true most of the times (leaving a caveate for the 2% misdiagnosed cases) which also means that those diagnosed with appendix actually have it.

A mentions that patients identified as not having appendicitics invariably have other medical conditions so they dont need to remove their appendicitis. Therefore the test for not having appendicitis is invariably accurate.
B is extreme as it uses 'always' and mentions that misdiagnosis is by claiming that one has appendix when he doesnt. But misdiagnosis can also be when one does indeed have one and its disgnosed that he doesnt.
C is extrme as it says that all patients diagnosed with appendicitis by this indeed have it. This doesnt leave a scope for the 2% misdiagnosed one's.
D might be true but it doesnt serve our purpose to prove the accuracy. those diagnosed have but those who have may or may not be diagnosed
E gives the reason for misdiagnosis but again doesnt prove that the diagnosis is correct.

Does anyone know the correct answer?

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 11 May 2010, 09:49
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the machine misdiagnoses 2% of the cases ..but what if these 2 cases were actually appendicitis cases and the machiens misdiagnosed them ...because it is a fatal disease so to complete this sentence we need B which states that the 2% cases are the ones who didnt need appendicitis removed but the machine misdiagnosed them ...in this way the machine is not avoiding the patients it needs to detect correctly for appendicitis .

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New post 11 May 2010, 10:06
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B.

The answer seems obvious when you rephrase the last sentence of the question as: new tech lowers instances of false positive but does not lower those of real positive since____

Answer: the misdiagnosis is always false positive instead of false negative.

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 12 May 2010, 00:41
More than the 2% misdiagnoses,it is important to know that the 98% of the
cases do infact have APPENDICITIS and hence are not unnecessary
Am tending towards C

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New post 13 May 2010, 05:40
OA is 'B'

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New post 15 May 2010, 05:43
yup B must be the answer

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Appendicitis (inflammation of the appendix) is potentially [#permalink]

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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 always 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 dont understand the OA.Guys explain.

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 02 Apr 2012, 00:23
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Basically the info that fills the blank is the one that suggests why in spite of using the internal scan the number of surgery performed will not decrease. We need some information regarding the misdiagnosed case. B fills the gap saying the misdiagnosed cases are infact not the misdiagnosed ones; they actually dont have appendicitis. hence the number actually infected is not reduced and hence the necessary removals will not decrease.

Hence B.

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 02 Apr 2012, 04:06
B it is...
Agree with kraizada84... rest of the options dont make much sense in filling the gap.

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New post 16 May 2012, 13:07
Also c and e are easily eliminated due to the extreme word.

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 18 May 2012, 08:17
I think I am the only one who doesn't understand even a bit of the justification mentioned above for answer B.

Argument states in conclusion :

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......(something that could justify the conclusion)

What I interpret from Argument is :

Despite of producing two misdiagnoses for every 98 correct diagnoses, new test will help doctors to avoid unnecessary removals of the appendix without performing fewer necessary ones than before. This is because.....................this test, if results in misdiagnosis, can only have false negative ( a person has appendicitis but diagnosed as not having one) but not false positive ( a person doesn't have appendicitis but diagnosed as having one). This means, A person who doesn't have appendicitis will never be diagnosed as having one and Doctor will never have to remove the appendix.

Now let's dissect options B and C (I don't see A, D, E have much relevance anyway)

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
=> This is a case of False Positives (Wrong Alarm). And It will obviously result in "Unnecessarry removal of Appendix"

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
=> This can be interpreted as a case of "NO False Positives (Wrong Alarm)". And It will not result in "Unnecessarry removal of Appendix". However, it may have false negatives (No Alarm, when there should be one).

Although "Option C" 'll harm those people who were not diagnosed with Appendicitis despite of having one, it strengthens the conclusion of this argument

As I am not with Official answer, I need expert views on this.
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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 26 Aug 2013, 13:59
LETS SAY

earlier 100 operations ( 20 unnecessary , 80 necessary)--all were operated no matter the misdiagnosis

NOW

98 sure shot operated, fate of 2 is unknown

If they have disease and are not operated the conclusion falls apart. Therefore, we need something to show that they will be operated if they actually have it.

Choice B tells that..no matter the misdiagnosis they will be operated...proving the conclusion that " no fewer than necessary ops will take place"

therefore, B. Hope it helps

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New post 12 Aug 2014, 08:51
I chose B.
Anyone have the OA?
Experts?

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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New post 12 Aug 2014, 12:12
I dont think it is B and IMO it could be A or C. I chose C

B- This test used in B refers to the test which can accurately diagnose appendicitis. So it is the throwing negative light on this stating the misdiagnosis of the test is attributed to the people who actually dont have it

A- There is no concrete information that the medical condition is less serious than appendicitis. it may not be appendicitis but any other ailment which may still be serious

C -Though all is an extreme usage, this option prcisely tells why " performing any fewer necessary ones than before" which means, the scan does not misdiagnose any patient who is actually suffering with appendicitis to be suffering with a lesser disease

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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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Just to be sure - The OA is B) and the question is part of GMATPrep Exam Pack 1 - Mock 3

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 _____ .

Basically, the doctors can reduce the unnecessary operations but cannot avoid the necessary operations, using the new test. So, misdiagnosis is always shows Positive for negative cases or false negative cases. If it is the other way around, the false positive cases, the doctors will be performing more necessary removals.

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
- OFS as we are not talking about other medical conditions

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

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,have appendicitis
It doesn't say about the misdiagnosis. If the misdiagnosis is false positive, that will increase the necessary removals

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
We are not talking about the symptoms associated with appendicities

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
It doesn't explain why unnecessary removals can be done by the doctors
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Re: Appendicitis (inflammation of the appendix) is potentially [#permalink]

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I read this in other forum and it help me understand better the solution. See if helps anyone:

"Complete the passage questions are like inference questions. You will most likely have to put in the correct conclusion or else (as here) a correct piece of evidence that would logically support the conclusion. As with other inference questions, the best approach is to follow the gist of the passage, make a deduction and scan for a match.

Here, the author is arguing that the scan will obviate the need for surgeons to perform unnecessary appendectomies. Really? Let's examine what we have learned about the scan: the misdiagnosis rate is 2%. But are the misdiagnoses false positives or false negatives? A false positive is where the scan says you have appendictis when you don't while a false negative is when the scan fails to pick up that a patient has appendictis when in fact they do. False positives are not risky here b/c if a person who doesn't have appendictis gets his/her appendix removed, its no big deal. On the other hand, false negatives are very risky b/c if a person who has appendicitis doesn't get his/her appendix removed, then they may die. So, in order for the author's conclusion to be correct, the kind of misdiagnoses the scan makes must be false positives and not false negatives. That would be the piece of evidence that would support the conclusion (we know we want to put in some evidence here b/c the passage ends with "since'). That is our deduction, and now we scan for a match....choice B."

-> I think the statement we need to fill is a piece of information that will guarantee that they will perform "ALL THE NECESSARY" operations, in this case even when is a misdiagnoses. I think C does not clear that as well as B. C lives room to ask "what about the misdiagnoses?"

Hope it helps!

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Re: Appendicitis (inflammation of the appendix) is potentially   [#permalink] 13 Nov 2014, 02:49

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