NR509 MIDTERM EXAM TEST LATEST ACTUAL
EXAM WITH COMPLETE QUESTIONS AND
CORRECT ANSWERS RATED A+
A 21-year-old college student experiences tachycardia following a
night of heavy drinking. She is advised to undergo a stress
electrocardiogram (ECG). As she exercises, the recently
calibrated pulse oximeter records a heart rate ranging from 25
beats per minute (bpm) at rest to 50 bpm while jogging. The test
is stopped and re-started twice, and each time the pulse oximeter
yields a resting heart rate of 25 and a jogging heart rate of 50.
Which aspect of this instrument does the ECG technician
question?
a. Prevalence
b. Validity
c. Sensitivity
d. Specificity
e. Predictive value Correct Answer b. Validity
A 51-year-old moderately overweight college professor visits the
clinic with a complaint of chest pain after tennis matches. He
jokes that his tennis partner "is in a lot better shape than I am" but
says that he is trying to keep up. Later in the day, a 28-year-old
female student at the same college reports that "my chest often
feels hot and tight." She also feels stressed on the evening before
,mid-term exams. The clinician recommends an immediate
evaluation for coronary artery disease (CAD) for the professor, but
not for the student. Why?
a. Positive predictive value of an observation is higher in a group
with a higher prevalence of disease.
b. Positive predictive value of an observation is lower in a group
with a higher prevalence of disease.
c. Negative predictive value of an observation is lower in a group
with a higher prevalence of disease.
d. Negative predictive value of an observation is higher in a group
Correct Answer a. Positive predictive value of an observation is
higher in a group with a higher prevalence of disease.
A 23-year-old farm worker submits urine for testing. Three test
strips from Container A show abnormally low pH levels in the
urine. However, three test strips from Container B, purchased
more recently, consistently indicate that the pH of this patient's
urine is normal. Which of the following is a true statement about
the test strips?
a. The test strips demonstrate high interobserver reliability.
b. The test strips demonstrate low intraobserver reliability.
c. The test strips demonstrate high intraobserver reliability.
d. The test strips demonstrate high sensitivity.
,e. The test strips demonstrate high specificity. Correct Answer c.
The test strips demonstrate high intraobserver reliability.
A 45-year-old forklift driver presents to the clinic at 4 o'clock in the
afternoon complaining of intense substernal chest pain and
nausea. He appears pale and sweaty. At work that day, he filled in
for an absent co-worker and was asked to perform heavy lifting
not normally a part of his job. The physician assistant (PA)
questions the patient in detail about his nausea, eating habits,
and digestive history. Which of the following steps of clinical
reasoning has the PA failed to follow?
a. Elicit information about the patient's gastrointestinal (GI)
system
b. Localize findings anatomically
c. Match findings against conditions that could cause them
d. Give special consideration to potential life-threatening problems
e. Elicit information about the patient's family history of digestive
disorders Correct Answer d. Give special consideration to
potential life-threatening problems
The positive predictive value of a test is calculated as the number
of true positives identified by the test divided by the total positives
found by the test. If a novel test for strep throat yields 150 true-
positive results and 150 false-positive results, what is the positive
predictive value of this test?
, a. 10%
b. 25%
c. 50%
d. 75%
e. 100% Correct Answer c. 50%
OLDCARTS Correct Answer Onset
Location
Duration
Character
Aggravating or alleviating factors
Radiation
Timing
Setting
The negative predictive value of a test is calculated as the
number of true negatives identified by the test divided by the total
negatives found by the test. If a novel test for strep throat yields
85 true-negative results and 15 false-negative results, what is the
negative predictive value of this test?
a. 10%
EXAM WITH COMPLETE QUESTIONS AND
CORRECT ANSWERS RATED A+
A 21-year-old college student experiences tachycardia following a
night of heavy drinking. She is advised to undergo a stress
electrocardiogram (ECG). As she exercises, the recently
calibrated pulse oximeter records a heart rate ranging from 25
beats per minute (bpm) at rest to 50 bpm while jogging. The test
is stopped and re-started twice, and each time the pulse oximeter
yields a resting heart rate of 25 and a jogging heart rate of 50.
Which aspect of this instrument does the ECG technician
question?
a. Prevalence
b. Validity
c. Sensitivity
d. Specificity
e. Predictive value Correct Answer b. Validity
A 51-year-old moderately overweight college professor visits the
clinic with a complaint of chest pain after tennis matches. He
jokes that his tennis partner "is in a lot better shape than I am" but
says that he is trying to keep up. Later in the day, a 28-year-old
female student at the same college reports that "my chest often
feels hot and tight." She also feels stressed on the evening before
,mid-term exams. The clinician recommends an immediate
evaluation for coronary artery disease (CAD) for the professor, but
not for the student. Why?
a. Positive predictive value of an observation is higher in a group
with a higher prevalence of disease.
b. Positive predictive value of an observation is lower in a group
with a higher prevalence of disease.
c. Negative predictive value of an observation is lower in a group
with a higher prevalence of disease.
d. Negative predictive value of an observation is higher in a group
Correct Answer a. Positive predictive value of an observation is
higher in a group with a higher prevalence of disease.
A 23-year-old farm worker submits urine for testing. Three test
strips from Container A show abnormally low pH levels in the
urine. However, three test strips from Container B, purchased
more recently, consistently indicate that the pH of this patient's
urine is normal. Which of the following is a true statement about
the test strips?
a. The test strips demonstrate high interobserver reliability.
b. The test strips demonstrate low intraobserver reliability.
c. The test strips demonstrate high intraobserver reliability.
d. The test strips demonstrate high sensitivity.
,e. The test strips demonstrate high specificity. Correct Answer c.
The test strips demonstrate high intraobserver reliability.
A 45-year-old forklift driver presents to the clinic at 4 o'clock in the
afternoon complaining of intense substernal chest pain and
nausea. He appears pale and sweaty. At work that day, he filled in
for an absent co-worker and was asked to perform heavy lifting
not normally a part of his job. The physician assistant (PA)
questions the patient in detail about his nausea, eating habits,
and digestive history. Which of the following steps of clinical
reasoning has the PA failed to follow?
a. Elicit information about the patient's gastrointestinal (GI)
system
b. Localize findings anatomically
c. Match findings against conditions that could cause them
d. Give special consideration to potential life-threatening problems
e. Elicit information about the patient's family history of digestive
disorders Correct Answer d. Give special consideration to
potential life-threatening problems
The positive predictive value of a test is calculated as the number
of true positives identified by the test divided by the total positives
found by the test. If a novel test for strep throat yields 150 true-
positive results and 150 false-positive results, what is the positive
predictive value of this test?
, a. 10%
b. 25%
c. 50%
d. 75%
e. 100% Correct Answer c. 50%
OLDCARTS Correct Answer Onset
Location
Duration
Character
Aggravating or alleviating factors
Radiation
Timing
Setting
The negative predictive value of a test is calculated as the
number of true negatives identified by the test divided by the total
negatives found by the test. If a novel test for strep throat yields
85 true-negative results and 15 false-negative results, what is the
negative predictive value of this test?
a. 10%
