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 highlights the importance of understanding drug profiles, especially for medications used in cardiovascular, urological, and cancer treatments. It covers critical classes of drugs, including alpha blockers, beta blockers, and alkylating agents, emphasizing their mechanisms, clinical applications, and potential side effects. Essential principles such as receptor antagonism underscore the need for safe drug administration and effective patient management.

Learning Objectives

1

Describe the pharmacological profiles of drugs used for cardiovascular conditions, urological issues, and cancer treatment.

2

Explain the mechanisms of action of specific drug classes such as alpha blockers, beta blockers, and alkylating agents.

3

Identify the clinical applications and potential adverse effects associated with these pharmacological agents.

4

Understand the principles of receptor antagonism and its role in safe drug administration and patient management.

Key Concepts

CONCEPT

DEFINITION

Drug Profiles

Detailed summaries that include mechanisms of action, clinical applications, adverse effects, and interactions of pharmacological drugs.

Alpha Blockers

Drugs that inhibit alpha-adrenergic receptors to relax vascular smooth muscle and treat conditions such as hypertension and benign prostatic hyperplasia (BPH).

Phentolamine

A non-selective alpha blocker used to treat hypertensive emergencies by antagonizing alpha receptors.

Tamsulosin

A selective alpha blocker that targets receptors in the prostate to relieve symptoms associated with BPH.

Beta Blockers

Medications that block beta-adrenoceptors, reducing heart rate and blood pressure, and used for various cardiovascular conditions.

Alkylating Agents

A class of chemotherapy drugs that work by adding alkyl groups to DNA, thereby inhibiting cancer cell proliferation. Their use is associated with specific adverse effects and potential drug interactions.

Receptor Antagonism

A process where drugs bind to receptors without activating them, thereby blocking the effect of endogenous substances.

Example Problems

Example 1

The nurse is reviewing the use of bethanechol (Urecholine) in a patient who is experiencing postoperative urinary retention. Which statement best describes the mechanism of action of bethanechol? a It causes decreased bladder tone and motility. b. It causes increased bladder tone and motility. c It increases the sensation of a full bladder. d It causes the sphincters in the bladder to become tighter.

Example 2

The family of a patient who has recently been diagnosed with Alzheimer's disease is asking about the new drug prescribed to treat this disease. The patient's wife says, "I'm so excited that there are drugs that can cure this disease! I can't wait for him to start treatment." Which reply from the nurse is appropriate? a "The sooner he starts the medicine, the sooner it can have this effect." b "These effects won't be seen for a few months." c "These drugs do not cure Alzheimer's disease. Let's talk about what the physician said to expect with this drug therapy. $^{n}$ d ${ }^{"}$ His response to this drug therapy will depend on how far along he is in the disease process."

Example 3

The nurse is giving a dose of bethanechol (Urecholine) to a postoperative patient. The nurse is aware that contraindications to bethanechol include: a bladder atony. b peptic ulcer. c urinary retention. d hypothyroidism.

Example 4

A patient took an accidental overdose of a cholinergic drug while at home. He comes to the emergency department with severe abdominal cramping and bloody diarrhea. The nurse expects that which drug will be used to treat this patient? a atropine (generic) b physostigmine (Antilirium) c bethanechol (Urecholine) d phentolamine (Regitine)

Example 5

The nurse is reviewing the orders for a newly admitted patient and sees an order for edrophonium (Tensilon). The nurse expects that this drug is ordered for which reason? a To reduce symptoms and delay the onset of Alzheimer's disease b To treat the symptoms of myasthenia gravis c To aid in the diagnosis of myasthenia gravis d To reverse the effects of nondepolarizing neuromuscular blocking drugs after surgery
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Step-by-Step Explanations

QUESTION

How do alpha blockers like phentolamine and tamsulosin work to manage conditions such as hypertension and BPH?

STEP-BY-STEP ANSWER:

Step 1: Identify that alpha blockers target alpha-adrenergic receptors located on blood vessels and in the prostate.
Step 2: Understand that receptor antagonism prevents the binding of catecholamines, leading to relaxation of vascular smooth muscles in hypertension or smooth muscle in the prostate.
Step 3: Recognize that phentolamine, being a non-selective alpha blocker, blocks receptors in multiple tissues to provide rapid vasodilation.
Step 4: Note that tamsulosin selectively targets receptors in the prostate, reducing urinary obstruction symptoms in BPH.
Final Answer: Alpha blockers work by binding to and inhibiting alpha receptors, leading to decreased vascular resistance and smooth muscle relaxation, which assists in managing hypertension and BPH.

Alpha Blockers Mechanism

QUESTION

What is the mechanism by which beta blockers help manage cardiovascular conditions?

STEP-BY-STEP ANSWER:

Step 1: Identify beta-adrenergic receptors in the heart and vascular tissue.
Step 2: Understand that beta blockers inhibit these receptors, reducing heart rate and the force of contraction.
Step 3: Note that by decreasing sympathetic stimulation, beta blockers lower blood pressure and reduce cardiac workload.
Step 4: Recognize that this mechanism also helps in managing arrhythmias and other cardiovascular complications.
Final Answer: Beta blockers function by antagonizing beta-adrenergic receptors, leading to reduced heart rate and blood pressure, thereby managing various cardiovascular conditions effectively.

Beta Blockers Mechanism

QUESTION

How do alkylating agents work in the treatment of cancer, and what considerations should be taken into account regarding adverse effects?

STEP-BY-STEP ANSWER:

Step 1: Acknowledge that alkylating agents add alkyl groups to the DNA of cancer cells.
Step 2: Understand that this leads to DNA cross-linking and breaks, ultimately inhibiting cell division.
Step 3: Recognize that while effective, these agents affect both cancerous and healthy cells, leading to adverse effects such as bone marrow suppression.
Step 4: Consider drug interactions and the need for careful dosing to minimize toxicity.
Final Answer: Alkylating agents work by damaging DNA through alkylation, which hinders cell replication; however, their use must be carefully managed due to significant adverse effects and potential interactions.

Alkylating Agents in Cancer Treatment

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Common Mistakes

  • Confusing the action of alpha blockers with that of other vasodilating agents that do not work via receptor antagonism.
  • Assuming that all beta blockers have identical effects without considering individual pharmacokinetic and pharmacodynamic properties.
  • Overlooking the adverse effects and interactions of alkylating agents due to their potent cytotoxic nature.
  • Neglecting the selective action of drugs like tamsulosin, which is specifically tailored for urological conditions and should not be used interchangeably with non-selective agents.