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 24 on Heart Failure Drugs provides a comprehensive overview of several drug classes, including alpha blockers, beta blockers, alkylating agents, and MAO-B inhibitors. The chapter emphasizes understanding each drug’s mechanism of action, pharmacokinetic profile, clinical applications, contraindications, and potential adverse effects. These insights are essential for accurate diagnosis, effective treatment planning, management of complications such as extravasation, and prevention of medication errors in clinical practice.

Learning Objectives

1

Describe the mechanisms of action for various heart failure drugs, including alpha blockers, beta blockers, alkylating agents, and MAO-B inhibitors.

2

Explain the pharmacokinetic properties and clinical applications of these drugs in conditions such as pheochromocytoma and Parkinson's disease.

3

Identify contraindications and potential adverse effects associated with these drug profiles.

4

Apply knowledge of drug profiles to prevent medication errors and manage complications like extravasation in clinical practice.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

Drugs that inhibit alpha-adrenergic receptors, leading to vasodilation. Examples include phentolamine and tamsulosin, used for conditions such as pheochromocytoma.

Beta Blockers

Medications that block beta-adrenergic receptors, reducing heart rate and myocardial contractility, commonly used in treating various cardiovascular conditions.

Alkylating Agents

A class of chemotherapy drugs that work by adding an alkyl group to DNA, thereby inhibiting cell replication. They are used to treat various forms of cancer.

MAO-B Inhibitors

Drugs that selectively inhibit monoamine oxidase B, increasing dopamine levels in the brain, primarily used in the management of Parkinson's disease.

Pharmacokinetics

The study of how a drug is absorbed, distributed, metabolized, and excreted by the body.

Mechanism of Action

A description of the biochemical and physiological effects of a drug and its mechanism in the body.

Example Problems

Example 1

When teaching the patient about the signs and symptoms of cardiac glycoside toxicity, the nurse should alert the patient to watch for a visual changes such as photophobia. b flickering lights or halos around lights. c dizziness when standing up. d increased urine output.

Example 2

During assessment of a patient who is receiving digoxin, the nurse monitors for findings that would indicate an increased possibility of toxicity, such as: a apical pulse rate of 62 beats/min. b digoxin level of $1.5 \mathrm{ng} / \mathrm{mL}$. $c$ serum potassium level of $2.0 \mathrm{mEq} / \mathrm{L}$. d serum calcium level of $9.9 \mathrm{mEq} / \mathrm{L}$

Example 3

When monitoring a patient who is receiving an intravenous infusion of nesiritide (Natrecor), the nurse will look for which adverse effect? a Dysrhythmia b Proteinuria c Hyperglycemia d Hypertension

Example 4

A patient is taking a beta blocker as part of the treatment plan for heart failure. The nurse knows that the purpose of the beta blocker for this patient is to a increase urine output. $\mathbf{b}$ prevent stimulation of the heart by catecholamines. $c$ increase the contractility of the heart muscle. d cause peripheral vasodilation.

Example 5

The nurse is assessing a patient who is receiving a milrinone infusion and checks the patient's cardiac rhythm on the heart monitor. What adverse cardiac effect is most likely to occur in a patient who is receiving intravenous milrinone? a Tachycardia b Bradycardia c Atrial fibrillation d Ventricular dysrhythmia
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Step-by-Step Explanations

QUESTION

How does phentolamine work in the treatment of pheochromocytoma?

STEP-BY-STEP ANSWER:

Step 1: Recognize that pheochromocytoma is a tumor that causes excessive release of catecholamines.
Step 2: Understand that phentolamine is an alpha blocker that inhibits alpha-adrenergic receptors.
Step 3: Blocking these receptors results in vasodilation, reducing blood pressure spikes caused by catecholamines.
Step 4: This mechanism helps in managing the hypertensive crises associated with pheochromocytoma.
Final Answer: Phentolamine mitigates the effects of excessive catecholamines by blocking alpha receptors, thereby managing blood pressure in pheochromocytoma patients.

Phentolamine

QUESTION

What steps should be taken to manage complications such as extravasation when administering alkylating agents?

STEP-BY-STEP ANSWER:

Step 1: Identify early signs of extravasation, such as swelling, pain, or redness at the injection site.
Step 2: Immediately stop the infusion to prevent further tissue damage.
Step 3: Administer the appropriate antidote or treatment protocol as per established guidelines.
Step 4: Provide supportive care to mitigate tissue injury and monitor for adverse reactions.
Final Answer: Effective management of extravasation involves early detection, stopping the infusion, administering treatments, and close monitoring to prevent complications.

Extravasation Management with Chemotherapy Agents

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Common Mistakes

  • Confusing the distinct mechanisms of action between alpha blockers and beta blockers.
  • Overlooking the importance of pharmacokinetic differences when selecting a drug for a specific condition.
  • Neglecting contraindications which can lead to adverse effects in vulnerable patients.
  • Assuming that all adverse effects are common across similar drug classes without considering individual drug profiles.