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

Chapter 40 on Antiviral Drugs, with its focus on drug profiles and pathophysiology, provides a comprehensive overview of various pharmacological agents including alpha blockers, beta blockers, MAO-B inhibitors, and alkylating agents. The chapter emphasizes the importance of understanding each drug’s mechanism of action, indications, contraindications, pharmacokinetics, and adverse effects, while also highlighting the critical role of safety protocols and drug interaction awareness in clinical practice.

Learning Objectives

1

Describe the pharmacological profiles of alpha blockers, beta blockers, MAO-B inhibitors, and alkylating agents.

2

Explain the mechanisms of action, indications, contraindications, and pharmacokinetics for each drug class.

3

Analyze potential adverse effects and drug interactions associated with these pharmacological agents.

4

Discuss the importance of proper drug selection and safety protocols, especially in handling injectable medications.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

A class of drugs (e.g. phentolamine, tamsulosin) that inhibit alpha-adrenergic receptors to cause vasodilation and are used in conditions such as hypertension and benign prostatic hyperplasia.

Beta Blockers

Medications that block beta-adrenergic receptors, reducing heart rate and blood pressure, and are used in treating cardiovascular conditions such as arrhythmias and hypertension.

MAO-B Inhibitors

Drugs that inhibit the monoamine oxidase B enzyme, thereby increasing dopamine levels in the brain; commonly used in the treatment of Parkinson’s disease.

Alkylating Agents

Chemotherapeutic agents that work by adding alkyl groups to DNA, thereby interfering with cell division and used in the treatment of various cancers.

Pharmacokinetics

The study of how drugs are absorbed, distributed, metabolized, and excreted by the body.

Drug Interactions

The effects that may occur when one drug influences the pharmacological response of another when administered together.

Example Problems

Example 1

During treatment with zidovudine, the nurse needs to monitor for which potential adverse effect? a Retinitis b Deep vein thromboses c Kaposi's sarcoma d Bone marrow suppression

Example 2

After giving an injection to a patient with HIV infection, the nurse accidentally receives a needlestick from a too-full needle disposal box. Recommendations for occupational HIV exposure may include the use of which drug(s)? a didanosine b lamivudine and enfuvirtide c zidovudine, lamivudine, and indinavir d acvclovir

Example 3

When the nurse is teaching a patient who is taking acyclovir for genital herpes, which statement by the nurse is accurate? a "This drug will help the lesions to dry and crust over." b "Acyclovir will eradicate the herpes virus." c "This drug will prevent the spread of this virus to others." d "Be sure to give this drug to your partner, too."

Example 4

A patient who has been newly diagnosed with HIV has many questions about the effectiveness of drug therapy. After a teaching session, which statement by the patient reflects a need for more education? a "I will be monitored for side effects and improvements while I'm taking this medicine." b "These drugs do not eliminate the HIV, but hopefully the amount of virus in my body will be reduced." $\mathrm{c}^{\text {"There is no cure for HIV." }}$ d "These drugs will eventually eliminate the virus from my body."

Example 5

After surgery for organ transplantation, a patient is receiving ganciclovir, even though he does not have a viral infection. Which statement best explains the rationale for this medication therapy? a Ganciclovir is used to prevent potential exposure to the HIV virus. b This medication is given prophylactically to prevent influenza A infection. c Ganciclovir is given to prevent CMV infection. d The drug works synergistically with antibiotics to prevent superinfections.
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Step-by-Step Explanations

QUESTION

How do you determine the suitability of an alpha blocker like tamsulosin for a patient with urinary retention associated with benign prostatic hyperplasia?

STEP-BY-STEP ANSWER:

Step 1: Review patient’s medical history, including any cardiovascular issues, to assess for contraindications.
Step 2: Understand the mechanism of tamsulosin—it relaxes smooth muscle in the bladder neck and prostate by blocking alpha-1 receptors.
Step 3: Evaluate the patient’s symptoms and severity to determine if the drug’s action will be beneficial.
Step 4: Consider potential drug interactions with the patient’s current medications.
Step 5: Decide on proper dosing and monitor the patient for improvement and any adverse effects.
Final Answer: Tamsulosin is suitable if benefits outweigh risks in the context of patient’s overall condition and potential drug interactions are well managed.

Evaluating Alpha Blockers

QUESTION

What are the key steps to evaluate beta blockers for managing a patient with hypertension and arrhythmia?

STEP-BY-STEP ANSWER:

Step 1: Diagnose and confirm the presence of hypertension and any arrhythmias through clinical assessment and diagnostic tests.
Step 2: Understand that beta blockers reduce heart rate and contractility by blocking beta-adrenergic receptors.
Step 3: Examine potential contraindications such as asthma or severe peripheral vascular disease.
Step 4: Analyze other medications the patient is taking to rule out adverse drug interactions.
Step 5: Initiate treatment with an appropriate beta blocker, adjusting dosage based on patient response and side effects.
Final Answer: A careful evaluation of clinical status and potential contraindications determines the appropriateness of beta blockers in this scenario.

Assessing Beta Blockers

QUESTION

How would you approach the use of MAO-B inhibitors in the treatment plan for a patient with Parkinson’s disease?

STEP-BY-STEP ANSWER:

Step 1: Review the patient’s diagnosis and stage of Parkinson’s disease, ensuring MAO-B inhibitors are indicated.
Step 2: Identify the specific MAO-B inhibitor being considered and its mechanism of increasing dopamine levels in the brain.
Step 3: Assess patient’s current medication regimen to identify potential interactions, especially with other antidepressants or dietary restrictions.
Step 4: Consider the pharmacokinetics to optimize dosing and timing for maximum therapeutic effect.
Step 5: Monitor the patient for side effects, such as orthostatic hypotension or dyskinesia, and adjust treatment as necessary.
Final Answer: MAO-B inhibitors are integrated into the patient’s treatment after careful assessment of disease stage, current medications, and potential side effects.

Utilizing MAO-B Inhibitors

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Common Mistakes

  • Confusing the mechanism of action of different drug classes, such as misidentifying an alpha blocker’s function with that of a beta blocker.
  • Overlooking contraindications that may exacerbate a patient’s existing conditions.
  • Failing to consider potential drug interactions when multiple medications are prescribed.
  • Neglecting safety protocols in the administration of injectable medications, leading to avoidable complications.