TEST BANK LEHNE’S PHARMACOLOGY
CHAPTERS 71-75
Chapter 71: Cyclooxygenase Inhibitors: Nonsteroidal
Anti-inflammatory Drugs and Acetaminophen
MULTIPLE CHOICE
1. A nurse is teaching a group of nursing students about cyclooxygenase inhibitors. Which
statement by a student indicates understanding of the teaching?
a. “Cyclooxygenase-2 inhibition causes gastrointestinal side effects.”
b. “Cyclooxygenase-2 is considered the ‘bad COX.’”
c. “Inhibition of cyclooxygenase-1 promotes myocardial infarction and stroke.”
d. “Inhibition of cyclooxygenase-1 results in suppression of inflammation.”
ANS: B
Because cyclooxygenase-2 (COX-2) primarily mediates harmful processes in the
body, it is called the “bad COX”; suppression of COX-2 results in largely beneficial
effects. The gastrointestinal (GI) side effects of COX inhibitors are the result of COX-
1 inhibition. One of two harmful side effects of COX-2 inhibition is suppression of
vasodilation, which leads to an increased risk of myocardial infarction (MI) and
stroke. Inhibition of COX-2 causes suppression of inflammation.
DIF: Cognitive Level: Analysis REF: Mechanism of Action TOP:
Nursing Process: Evaluation MSC: NCLEX Client Needs Category:
Physiologic Integrity: Pharmacologic and Parenteral Therapies
2. A patient who takes daily doses of aspirin is scheduled for surgery next week. The nurse
should advise the patient to:
a. continue to use aspirin as scheduled.
b. reduce the aspirin dosage by half until after surgery.
c. stop using aspirin immediately.
d. stop using aspirin 3 days before surgery.
ANS: C
Aspirin must be withdrawn at least 1 week before surgery. Aspirin cannot be
continued as scheduled, because the risk for bleeding is too great. An interval of 3
days is not long enough for the bleeding effects of aspirin to be reversed. Cutting the
dose in half would not reduce the effects of bleeding associated with aspirin use.
DIF: Cognitive Level: Application REF: Aspirin | Adverse Effects |
Bleeding TOP: Nursing Process: Implementation MSC: NCLEX
, Client Needs Category: Physiologic Integrity: Pharmacologic and Parenteral
Therapies
3. A patient who is taking acetaminophen for pain wants to know why it does not cause
gastrointestinal upset, as do other over-the-counter pain medications. The nurse will
explain that this is most likely because of which property of acetaminophen?
a. It does not inhibit cyclooxygenase.
b. It has minimal effects at peripheral sites.
c. It is more similar to opioids than to nonsteroidal anti-inflammatory drugs
(NSAIDs).
d. It is selective for cyclooxygenase-2.
ANS: B
The differences between the effects of acetaminophen and aspirin are thought to result
from selective inhibition of cyclooxygenase; acetaminophen has only minimal effects
on cyclooxygenase at peripheral sites, which may explain why acetaminophen does
not have adverse GI, renal, and antiplatelet effects. Acetaminophen is a selective
COX inhibitor. It is not more similar to opioids than NSAIDs. It is not selective for
COX-2.
DIF: Cognitive Level: Application REF: Acetaminophen | Mechanism of
Action TOP: Nursing Process: Evaluation MSC: NCLEX
Client Needs Category: Physiologic Integrity: Pharmacologic and Parenteral
Therapies
4. A patient tells the nurse that she takes aspirin for menstrual cramps, but she does not feel
that it works well. What will the nurse suggest?
a. The patient should avoid any type of COX inhibitor because of the risk of Reye’s
syndrome.
b. The patient should increase the dose to a level that suppresses inflammation.
c. The patient should use a first-generation nonsteroidal anti-inflammatory
medication instead.
d. The patient should use acetaminophen because of its selective effects on uterine
smooth muscle.
ANS: C
Aspirin (ASA) has analgesic effects for joint pain, muscle pain, and headache, but it is
relatively ineffective against visceral pain, including uterine smooth muscle pain, for
which NSAIDs are indicated. The risk of Reye’s syndrome is associated with the use
of ASA in children to treat fever. Increasing the ASA dose to anti-inflammatory levels
is useful for rheumatic fever, tendonitis, and bursitis. Acetaminophen is not effective
for dysmenorrhea.
DIF: Cognitive Level: Application REF: Aspirin | Therapeutic Uses |
Nonaspirin First-Generation NSAIDs TOP: Nursing Process:
Implementation MSC: NCLEX Client Needs Category: Physiologic
, Integrity: Pharmacologic and Parenteral Therapies
5. A patient who takes aspirin for rheumatoid arthritis is admitted to the hospital
complaining of headache and ringing in the ears. The plasma salicylate level is 300
mcg/mL, and the urine pH is 6.0. What will the nurse do?
a. Increase the aspirin dose to treat the patient’s headache.
b. Notify the provider of possible renal toxicity.
c. Prepare to provide respiratory support, because the patient shows signs of
overdose.
d. Withhold the aspirin until the patient’s symptoms have subsided.
ANS: D
This patient shows signs of salicylism, which occurs when ASA levels climb just
slightly above therapeutic level. Salicylism is characterized by tinnitus, sweating,
headache, and dizziness. Tinnitus is an indication that the maximum acceptable dose
has been achieved. Toxicity occurs at a salicylate level of 400 mcg/mL or higher.
ASA should be withheld until the symptoms subside and then should be resumed at a
lower dose. Increasing the dose would only increase the risk of toxicity. Signs of renal
impairment include oliguria and weight gain, which are not present in this patient.
This patient has salicylism, not salicylate toxicity, so respiratory support measures are
not indicated.
DIF: Cognitive Level: Application REF: Aspirin | Adverse Effects |
Salicylism TOP: Nursing Process: Evaluation MSC: NCLEX Client
Needs Category: Physiologic Integrity: Pharmacologic and Parenteral
Therapies
6. An adolescent is brought to the emergency department by a parent who reports that the
patient took a whole bottle of extended-release acetaminophen tablets somewhere
between 8 and 10 hours ago. The nurse will anticipate administering which of the
following?
a. Acetylcysteine (Mucomyst)
b. Activated charcoal
c. Hemodialysis
d. Respiratory support
ANS: A
The nurse should anticipate giving acetylcysteine, because it is the specific antidote
for acetaminophen overdose. It is 100% effective when given within 8 to 10 hours
after ingestion and may still have some benefit after this interval. Activated charcoal
is effective only if given before the medication is absorbed, so it must be given much
sooner. Hemodialysis is not indicated. Respiratory support is used for ASA overdose.
DIF: Cognitive Level: Application REF: Acetaminophen | Acute Toxicity:
Liver Damage TOP: Nursing Process: Implementation MSC:
NCLEX Client Needs Category: Physiologic Integrity: Reduction of Risk
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ExamsRevision. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.76. You're not tied to anything after your purchase.
