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 provides a comprehensive overview of key drug profiles including alpha blockers, beta blockers, and alkylating agents. It highlights the mechanisms of action, clinical applications, and potential pitfalls in administration. The discussion emphasizes the importance of understanding receptor selectivity in beta blockers, protocol-driven applications of alpha blockers in cardiovascular and urological emergencies, and the critical role of alkylating agents in oncology, along with inherent risks in their use.

Learning Objectives

1

Describe the profiles and mechanisms of action for alpha blockers, beta blockers, and alkylating agents.

2

Explain the clinical applications of alpha blockers in cardiovascular and urological conditions, including diagnosis protocols for pheochromocytoma and management of extravasation.

3

Analyze how receptor selectivity influences the effects of beta blockers on myocardial function.

4

Evaluate the role and mechanisms of alkylating agents in cancer treatment, and recognize potential errors in their administration.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

A class of drugs that inhibit the alpha-adrenergic receptors, used in managing cardiovascular issues such as hypertensive crises (e.g., phentolamine) and in treating urological conditions like benign prostatic hyperplasia (e.g., tamsulosin).

Beta Blockers

Drugs that block beta-adrenergic receptors, affecting myocardial function; their effectiveness depends on receptor selectivity which can influence therapeutic outcomes in treating conditions such as arrhythmias and hypertension.

Alkylating Agents

Chemotherapeutic drugs that work by adding alkyl groups to DNA, thereby interfering with cell division and replication; they are pivotal in the treatment of various cancers and require careful administration due to potential toxicities.

Example Problems

Example 1

The nurse is assessing a patient who is about to receive antifungal drug therapy. Which problem would be of most concern? a Endocrine disease b Hepatic disease c Cardiac disease d Pulmonary disease

Example 2

While monitoring a patient who is receiving intravenous amphotericin $\mathrm{B},$ the nurse expects to see which adverse effect(s)? a Hypertension b Bradycardia c Fever and chills d Diarrhea and stomach cramps

Example 3

When administering antifungal drug therapy, the nurse knows that an issue that contributes to many of the drug interactions with antifungals is the patient's a history of cardiac disease. b history of gallbladder surgery. c ethnic background. d cytochrome $\mathrm{P}-450$ enzyme system.

Example 4

During an infusion of amphotericin $\mathrm{B}$, the nurse knows that which administration technique may be used to minimize infusion-related adverse effects? a Forcing of fluids during the infusion b Infusing the medication quickly c Infusing the medication over a longer period of time d Stopping the infusion for 2 hours after half of the bag has infused, then resuming 1 hour later

Example 5

When teaching a patient who is taking nystatin lozenges for oral candidiasis, which instruction by the nurse is correct? a "Chew the lozenge carefully before swallowing." b "Dissolve the lozenge slowly and completely in your mouth." c "Dissolve the lozenge until it is half the original size, and then swallow it." d "These lozenges need to be swallowed whole with a glass of water."
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Step-by-Step Explanations

QUESTION

How does phentolamine work as an alpha blocker in cardiovascular applications?

STEP-BY-STEP ANSWER:

Step 1: Identify that phentolamine binds to alpha-adrenergic receptors, preventing the action of catecholamines.
Step 2: Recognize that by inhibiting these receptors, the drug leads to vasodilation, which can reduce blood pressure in hypertensive emergencies.
Step 3: Note that this mechanism is particularly useful in managing conditions like pheochromocytoma where excess catecholamine release occurs.
Final Answer: Phentolamine acts as an alpha blocker by binding to alpha receptors, causing vasodilation and reducing blood pressure in conditions such as hypertensive crises.

Alpha Blockers (Phentolamine)

QUESTION

How does receptor selectivity in beta blockers influence their effect on myocardial function?

STEP-BY-STEP ANSWER:

Step 1: Understand that beta blockers can be selective (primarily affecting beta-1 receptors in the heart) or non-selective (affecting both beta-1 and beta-2 receptors).
Step 2: Recognize that selective beta blockers primarily influence heart rate and contractility, providing targeted therapy for myocardial function issues.
Step 3: Acknowledge that non-selective beta blockers may affect other tissues, potentially leading to broader side effects.
Final Answer: Receptor selectivity in beta blockers determines their impact on myocardial function, providing a balance between therapeutic benefits and side effects based on whether the drug is beta-1 selective or non-selective.

Beta Blockers

QUESTION

What is the mechanism of action of alkylating agents in cancer treatment?

STEP-BY-STEP ANSWER:

Step 1: Recognize that alkylating agents target DNA by attaching alkyl groups to nucleotide bases.
Step 2: Understand that this damage disrupts DNA replication and cell division, preferentially affecting rapidly dividing cancer cells.
Step 3: Identify the importance of proper dosing and administration to minimize harm to normal cells while maximizing cancer cell destruction.
Final Answer: Alkylating agents exert their anticancer effect by alkylating DNA, disrupting replication and cell division, which leads to the death of rapidly dividing cancer cells.

Alkylating Agents

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Common Mistakes

  • Confusing the specific use of different alpha blockers, for instance misapplying phentolamine in non-cardiovascular contexts.
  • Overlooking the significance of receptor selectivity when prescribing beta blockers, which may lead to unintended side effects.
  • Underestimating the potential for administration errors with alkylating agents, ignoring the strict protocols needed to minimize toxicity.
  • Assuming all drugs within these categories have the same indication, rather than understanding the nuances of their specific clinical applications.