Book cover for Pharmacology and the Nursing Process

Pharmacology and the Nursing Process

Linda Lane Lilley, Shelly Rainforth Collins, Julie S. Snyder

ISBN #9780323087896

7th Edition

394 Questions

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2,697 Students Helped

Homework Questions

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Summary
Learning Objectives
Key Concepts
Example Problems
Explanations
Common Mistakes

Summary

This chapter emphasizes the critical importance of understanding drug profiles for biologic response–modifying and antirheumatic drugs. It focuses on various drug classes such as alpha blockers, beta blockers, MAO-B inhibitors, alkylating agents, and cytotoxic antibiotics, detailing their mechanisms, pharmacokinetics, adverse effects, contraindications, and interactions. Clinicians are encouraged to apply this knowledge to optimize therapeutic outcomes and minimize risks across diverse clinical scenarios.

Learning Objectives

1

Describe the mechanisms of action and pharmacokinetic properties of various drug classes including alpha blockers, beta blockers, MAO-B inhibitors, alkylating agents, and cytotoxic antibiotics.

2

Identify and explain the adverse effects, contraindications, and potential drug interactions of these medications.

3

Distinguish between the clinical applications of these drug classes in conditions such as hypertension, benign prostatic hyperplasia (BPH), cancer, and neurological disorders like Parkinson’s disease.

4

Develop the ability to analyze drug profiles to ensure safe and effective therapeutic use.

Key Concepts

CONCEPT

DEFINITION

Mechanism of Action

The process by which a drug exerts its biological effect at the target site.

Pharmacokinetics

The study of the absorption, distribution, metabolism, and excretion of drugs.

Adverse Effects

Unintended, harmful reactions to a drug that may occur at therapeutic doses.

Contraindications

Specific situations or conditions where a particular drug should not be used because it may be harmful.

Drug Interactions

The effects that may occur when one drug influences the activity, concentration, or efficacy of another when administered together.

Alpha Blockers

A class of drugs that relax smooth muscle tissue, often used to treat hypertension and BPH.

Beta Blockers

Medications that reduce blood pressure and heart rate by blocking beta-adrenergic receptors.

MAO-B Inhibitors

Drugs that inhibit the monoamine oxidase-B enzyme, primarily used in the management of Parkinson’s disease.

Alkylating Agents

A group of chemotherapy drugs that work by adding alkyl groups to DNA, interfering with cell replication, commonly used in cancer treatment.

Cytotoxic Antibiotics

Antibiotics that interfere with the DNA replication of cells, utilized in chemotherapy to target rapidly dividing cancer cells.

Example Problems

Example 1

The nurse is conducting a class on drugs for malignant tumors for a group of new oncology staff members. Which best describes the action of interferons in the management of malignant tumors? a Interferons increase the production of specific anticancer enzymes. b Interferons have antiviral and antitumor properties and strengthen the immune system. c Interferons stimulate the production and activation of $\mathrm{T}$ lymphocytes and cytotoxic T cells. d Interferons help improve the cell-killing action of T cells because they are retrieved from healthy donors.

Example 2

When planning care for a patient who is receiving interferon therapy, the nurse must keep in mind that the major doselimiting factor is a fatigue. b bone marrow suppression. c fever. d nausea and vomiting.

Example 3

The nurse is administering methotrexate as part of the treatment for rheumatoid arthritis and will monitor for which sign of bone marrow suppression? a Edema b Tinnitus c Increased bleeding tendencies d Tingling in the extremities

Example 4

In caring for a patient receiving therapy with a myelosuppressive antineoplastic drug, the nurse notes an order to begin filgrastim after the chemotherapy is completed. Which statement correctly describes when the nurse will begin the filgrastim therapy? a It can be started during the chemotherapy. b It will begin immediately after the chemotherapy is completed. c It will be initiated 24 hours after the chemotherapy is completed. d It will not be started until at least 72 hours after the chemotherapy is completed.

Example 5

The nurse is monitoring a patient who has been receiving aldesleukin (IL-2) (Proleukin) for treatment of malignant melanoma. Which adverse effect, if noted on assessment, is of primary concern? a Chills b Fatigue c Headache d Fluid retention
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Step-by-Step Explanations

QUESTION

How do beta blockers contribute to the management of hypertension?

STEP-BY-STEP ANSWER:

Step 1: Recognize that beta blockers work by blocking beta-adrenergic receptors, which are normally stimulated by adrenaline and noradrenaline.
Step 2: Understand that this blockade reduces heart rate and contractility, thereby decreasing cardiac output.
Step 3: Understand that the reduction in cardiac workload helps lower blood pressure.
Step 4: Appreciate that beta blockers also help in managing symptoms of anxiety and arrhythmias which can be associated with hypertension.
Final Answer: Beta blockers help manage hypertension by reducing heart rate and contractility, thus lowering cardiac output and, ultimately, blood pressure.

Beta Blockers

QUESTION

What is the role of MAO-B inhibitors in the treatment of Parkinson’s disease?

STEP-BY-STEP ANSWER:

Step 1: Identify that Parkinson’s disease is associated with low levels of dopamine in the brain.
Step 2: MAO-B inhibitors work by inhibiting the enzyme monoamine oxidase-B, which is responsible for breaking down dopamine.
Step 3: Inhibition of MAO-B leads to increased availability of dopamine in the central nervous system.
Step 4: This helps improve the symptoms associated with Parkinson’s, such as motor control and tremor.
Final Answer: MAO-B inhibitors work in the treatment of Parkinson’s disease by preventing the breakdown of dopamine, thereby increasing its levels and improving motor function.

MAO-B Inhibitors

QUESTION

How do alkylating agents exert their anticancer effects?

STEP-BY-STEP ANSWER:

Step 1: Recognize that alkylating agents add alkyl groups to DNA.
Step 2: This addition causes cross-linking of DNA strands or mispairing of nucleotides.
Step 3: The interference with DNA replication and transcription leads to cell death, especially in rapidly dividing cells.
Step 4: Understand that while effective in killing cancer cells, these agents can also affect normal rapidly dividing cells, leading to adverse effects.
Final Answer: Alkylating agents exert their anticancer effects by alkylating DNA, thereby disrupting replication and transcription, which leads to the death of cancer cells.

Alkylating Agents

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Common Mistakes

  • Assuming that drugs with similar names or classes have identical mechanisms of action and clinical applications.
  • Overlooking the significance of pharmacokinetic properties, which can lead to improper dosing or timing of medication administration.
  • Failing to recognize potential drug interactions and contraindications, resulting in adverse effects.
  • Misidentifying the clinical scenarios for drug use, such as confusing the indications for beta blockers in hypertension with their use in other conditions.