Pharmacology and the Nursing Process

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

ISBN #9780323087896

7th Edition

394 Questions

2,697 Students Helped

Homework Questions

Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This chapter provides a comprehensive overview of drug profiles relevant to otic drugs, focusing on alpha blockers, beta blockers, antiparkinson drugs, and alkylating agents. Key insights include the dual therapeutic and diagnostic roles of drugs like phentolamine, the targeted use of tamsulosin in BPH, and the mechanism by which beta blockers reduce myocardial oxygen demand. The chapter underscores the crucial importance of safe and effective drug administration, particularly in managing complex medications such as antineoplastic agents, where correct dosing and administration routes are essential to patient safety.

Learning Objectives

Describe the various drug profiles covered in the chapter including alpha blockers, beta blockers, antiparkinson drugs, and alkylating agents.

Explain the therapeutic and diagnostic roles of specific drugs such as phentolamine and tamsulosin.

Analyze the mechanism by which beta blockers reduce myocardial oxygen demand.

Understand the importance of correct dosing, administration routes, and safety protocols particularly with antineoplastic agents.

Apply knowledge of drug mechanisms to ensure safe and effective drug administration in clinical practice.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

A class of drugs that inhibit alpha-adrenergic receptors, used therapeutically for conditions such as hypertension and for diagnostic purposes, as seen with phentolamine.

Beta Blockers

Medications that block beta-adrenergic receptors, reducing heart rate and myocardial oxygen demand, which is beneficial in managing cardiovascular diseases.

Antiparkinson Drugs

A group of medications used to manage symptoms of Parkinson's disease by affecting neurotransmitter activity in the brain.

Alkylating Agents

A class of antineoplastic drugs that interfere with DNA replication, used to treat various cancers, with an emphasis on correct dosing and administration routes.

Phentolamine

An alpha blocker used for both therapeutic and diagnostic purposes, particularly in conditions where vascular smooth muscle relaxation is required.

Tamsulosin

A selective alpha blocker used primarily in male patients with Benign Prostatic Hyperplasia (BPH) to improve urinary flow.

Example Problems

Example 1

While teaching a patient about treatment of otitis media, the nurse should mention that untreated otitis media may lead to a mastoiditis. b throat infections. c fungal ear infection. d decreased cerumen production.

Example 2

During a teaching session about eardrops, the patient tells the nurse, "I know why an antibiotic is in this medicine, but why do I need to take a steroid?" Which is the nurse's best answer? a "The steroid will help to soften the cerumen." $\mathrm{b}$ "The steroid reduces itching and inflammation." c "The steroid also has antifungal effects." d "This medication helps to anesthetize the area to decrease pain."

Example 3

The nurse is preparing to administer eardrops. Which technique for administering eardrops is correct? a Warm the solution to $100^{\circ} \mathrm{F}\left(37.7^{\circ} \mathrm{C}\right)$ before using. b Position the patient so that the unaffected ear is accessible. c Massage the tragus before administering the eardrops. d Gently insert a cotton ball into the outer ear canal after the drops are given.

Example 4

The nurse is discussing treatment of earwax buildup with a patient. Which statement about earwax emulsifiers is true? These drugs: a are useful for treatment of ear infections. b loosen impacted cerumen so that it may be removed by irrigation. $c$ are used to rinse out excessive earwax. d enhance the secretion of earwax.

Example 5

During an examination, the nurse notes that a patient has a perforated tympanic membrane. There is an order for eardrops. Which action by the nurse is most appropriate? a Give the medication as ordered. b Check the patient's hearing, and then give the drops. c Hold the medication, and check with the prescriber. d Administer the drops with a cotton wick.

Step-by-Step Explanations

QUESTION

How does phentolamine serve both therapeutic and diagnostic roles in clinical settings?

STEP-BY-STEP ANSWER:

Step 1: Recognize that phentolamine is an alpha blocker which inhibits alpha-adrenergic receptors.
Step 2: Understand that therapeutically, it is used to relieve conditions related to high blood pressure and vasoconstriction.
Step 3: Identify its diagnostic application, such as differentiating types of hypertension when used in specific testing protocols.
Step 4: Connect the mechanism of enzyme inhibition to its overall effect on vascular smooth muscle relaxation.
Final Answer: Phentolamine’s ability to block alpha receptors results in vascular dilation, making it valuable both in reducing blood pressure (therapeutic) and in diagnostic tests for certain cardiovascular conditions.

Phentolamine

QUESTION

Explain how beta blockers contribute to reducing myocardial oxygen demand and why this is critical in cardiovascular therapy.

STEP-BY-STEP ANSWER:

Step 1: Begin by recognizing that beta blockers inhibit beta-adrenergic receptors in the heart.
Step 2: Understand that this inhibition leads to decreased heart rate and contractility.
Step 3: Associate the reduction in heart activity with a decrease in the heart's oxygen demand.
Step 4: Recognize that lowered oxygen demand is particularly important in preventing ischemia and managing conditions such as angina.
Final Answer: Beta blockers reduce myocardial oxygen demand by slowing the heart rate and decreasing contractility, which is essential in managing and preventing cardiovascular events.

Beta Blockers

QUESTION

What are the key factors to consider when administering alkylating agents for cancer treatment?

STEP-BY-STEP ANSWER:

Step 1: Recognize that alkylating agents are used to damage the DNA of cancer cells, preventing their replication.
Step 2: Understand that correct dosing is critical to maximize therapeutic effects while minimizing toxicity.
Step 3: Identify the importance of the correct administration routes to ensure the agents reach the target effectively.
Step 4: Emphasize the need to avoid medication errors through careful calculation and monitoring.
Final Answer: When administering alkylating agents, it is essential to ensure accurate dosing, appropriate administration routes, and vigilant monitoring to achieve effective cancer treatment while reducing the risk of adverse effects.

Antineoplastic Agents (Alkylating Agents)

Common Mistakes

Confusing the diagnostic and therapeutic roles of drugs like phentolamine.
Overlooking the importance of correct dosing and monitoring when using antineoplastic agents.
Assuming all alpha blockers function similarly without considering specific clinical applications such as BPH.
Misinterpreting the mechanism of beta blockers as solely reducing heart rate, rather than also reducing myocardial oxygen demand.