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

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Summary
Learning Objectives
Key Concepts
Example Problems
Explanations
Common Mistakes

Summary

This chapter provides a detailed review of antianginal drug profiles, focusing on the pharmacodynamic and pharmacokinetic aspects of alpha blockers, beta blockers, and alkylating agents. Key medications like phentolamine and tamsulosin are examined, with emphasis on their clinical indications, contraindications, and adverse effects. The chapter underscores the importance of understanding drug interactions and precise dosing through pharmacokinetics for effective patient management and safety.

Learning Objectives

1

Explain the pharmacodynamics and pharmacokinetics of antianginal drugs, including alpha blockers, beta blockers, and alkylating agents.

2

Identify the clinical indications, contraindications, and adverse effects of key medications such as phentolamine and tamsulosin.

3

Analyze drug interactions and the role of pharmacokinetics in optimizing dosing strategies.

4

Evaluate the use of these drugs in specialized diagnostic and therapeutic contexts to optimize patient care.

Key Concepts

CONCEPT

DEFINITION

Pharmacodynamics

The study of the biochemical and physiological effects of drugs and their mechanisms of action on the body.

Pharmacokinetics

The analysis of how the body absorbs, distributes, metabolizes, and excretes a drug, which is crucial for proper dosing and drug interaction management.

Alpha Blockers

A class of drugs that inhibit alpha-adrenergic receptors, leading to vasodilation and other effects; examples include phentolamine and tamsulosin.

Beta Blockers

Medications that block beta-adrenergic receptors, reducing heart rate and myocardial oxygen demand, often used in managing angina and other cardiovascular conditions.

Alkylating Agents

A group of drugs that work by adding alkyl groups to DNA, affecting cell division and used in various therapeutic contexts.

Adverse Effects

Undesirable or harmful effects resulting from the use of a drug.

Contraindications

Specific situations or conditions under which a particular drug should not be used due to the risk of adverse effects.

Drug Interactions

The effects that may occur when one drug influences the activity, effectiveness, or toxicity of another.

Example Problems

Example 1

A patient has a new prescription for transdermal nitroglycerin patches. The nurse teaches the patient that these patches are most appropriately used for which reason? a To relieve exertional angina $\mathbf{b}$ To prevent palpitations $\mathrm{c}$ To prevent the occurrence of angina d To stop an episode of angina

Example 2

A nurse with adequate knowledge about the administration of intravenous nitroglycerin will recognize that which statement is correct? a The intravenous form is given by IV push injection. b Because the intravenous forms are short-lived, the dosing must be every 2 hours. c Intravenous nitroglycerin must be protected from exposure to light through use of special tubing. d Intravenous nitroglycerin can be given via gravity drip infusions.

Example 3

Which statement by the patient reflects the need for additional patient education about the calcium channel blocker diltiazem (Cardizem)? a "I can take this drug to stop an attack of angina." b "I understand that food and antacids alter the absorption of this oral drug." c "When the long-acting forms are taken, the drug cannot be crushed." d "This drug may cause my blood pressure to drop, so I need to be careful when getting up."

Example 4

While assessing a patient with angina who is to start beta blocker therapy, the nurse is aware that the presence of which condition may be a problem if these drugs are used? a Hypertension b Essential tremors c Exertional angina d Asthma

Example 5

A 68 -year-old man has been taking the nitrate isosorbide dinitrate (Isordil) for 2 years for angina. He recently has been experiencing erectile dysfunction and wants a prescription for sildenafil (Viagra). Which response would the nurse most likely hear from the prescriber? a "He will have to be switched to isosorbide mononitrate if he wants to take sildenafil." b "Taking sildenafil with the nitrate may result in severe hypotension, so a contraindication exists." c "I'll write a prescription, but if he uses it, he needs to stop taking the isosorbide for one dose." d "These drugs are compatible with each other, and so I'll write a prescription."
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Step-by-Step Explanations

QUESTION

How do the pharmacodynamic properties of phentolamine influence its clinical use in managing angina-related conditions?

STEP-BY-STEP ANSWER:

Step 1: Recognize that phentolamine acts as a nonselective alpha-adrenergic receptor antagonist, leading to vasodilation.
Step 2: Understand that by reducing vascular resistance, it helps alleviate excessive vasoconstriction which contributes to angina symptoms.
Step 3: Evaluate its clinical indications, such as hypertensive emergencies and specific diagnostic tests where rapid vasodilation is desired.
Step 4: Consider the potential adverse effects and contraindications (such as in patients with certain cardiac conditions) when deciding its use.
Final Answer: Phentolamine’s mechanism of blocking alpha receptors results in vasodilation, making it effective for conditions requiring rapid reduction in blood pressure and improved blood flow, which is vital in managing certain antianginal scenarios.

Phentolamine (Alpha Blocker)

QUESTION

What role does tamsulosin’s pharmacokinetic profile play in its therapeutic application?

STEP-BY-STEP ANSWER:

Step 1: Recognize that tamsulosin is designed to selectively block alpha receptors, particularly in smooth muscle tissue.
Step 2: Understand that its pharmacokinetic properties, such as absorption and half-life, are optimized for steady action, minimizing peak-related adverse effects.
Step 3: Analyze how these properties influence dosing schedules and timing of administration to maintain therapeutic levels.
Step 4: Assess clinical scenarios such as diagnostic testing or therapeutic use in urinary retention where steady receptor blockade improves outcomes.
Final Answer: Tamsulosin’s favorable pharmacokinetic profile allows for controlled and consistent receptor blockade, making it an effective therapeutic option in conditions that require precise dosing and minimal fluctuations in drug levels.

Tamsulosin (Alpha Blocker)

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Common Mistakes

  • Confusing the mechanism of action between alpha blockers and beta blockers, leading to incorrect therapeutic choices.
  • Neglecting the critical influence of pharmacokinetics in dosing, which can result in suboptimal drug levels and increased risk of adverse effects.
  • Overlooking contraindications and failing to adapt treatment plans based on the patient’s specific clinical conditions.
  • Assuming that all antianginal medications have similar profiles without considering the nuanced differences in their pharmacodynamics and clinical applications.