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 19 focuses on adrenergic-blocking drugs, detailing the mechanisms of alpha and beta blockers and their clinical applications in managing hypertension, angina, and BPH. The chapter emphasizes the importance of understanding drug actions for effective nursing interventions, patient education, and the prevention of side effects like hypotension, bradycardia, and bronchoconstriction.

Learning Objectives

1

Describe the mechanism of action of adrenergic-blocking drugs, including both alpha and beta blockers.

2

Explain how these drugs manage conditions such as hypertension, angina, and benign prostatic hyperplasia (BPH).

3

Analyze the nursing interventions required for safe administration and patient education regarding potential adverse effects.

4

Identify the key differences between alpha blockers (e.g., vasodilation) and beta blockers (e.g., decreased cardiac workload).

Key Concepts

CONCEPT

DEFINITION

Adrenergic-Blocking Drugs

Medications that inhibit the effects of the sympathetic nervous system by blocking adrenergic receptors. They include both alpha and beta blockers.

Alpha Blockers

Drugs that block alpha-adrenergic receptors leading to vasodilation and a decrease in blood pressure. They are used primarily in conditions like hypertension and sometimes BPH.

Beta Blockers

Medications that inhibit beta-adrenergic receptors, reducing heart rate, contractility, and overall cardiac workload. They are mainly used in treating conditions such as angina and hypertension.

Sympathetic Nervous System

A part of the autonomic nervous system that mediates the 'fight or flight' response, increasing heart rate, blood pressure, and overall metabolic activity.

Adverse Effects

Unintended effects that may occur with drug use, including hypotension, bradycardia, and bronchoconstriction in the context of adrenergic-blocking drugs.

Example Problems

Example 1

When a patient has experienced extravasation of a peripheral infusion of dopamine, the nurse will inject the alpha blocker phentolamine (Regitine) into the area of extravasation and expect which effect? a Vasoconstriction b Vasodilation c Analgesia d Hypotension

Example 2

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 3

When administering beta blockers, the nurse will follow which guideline for administration and monitoring? a The drug may be discontinued at any time. b Postural hypotension rarely occurs with this drug. c Tapering off the medication is necessary to prevent rebound hypertension. d The patient needs to stop taking the medication at once if he or she gains 3 to 4 pounds in a week.

Example 4

The nurse providing teaching for a patient who has a new prescription for beta $_{1}$ blockers will keep in mind that these drugs may result in which effect? a Tachycardia b Tachypnea c Bradycardia d Bradypnea

Example 5

A patient who has recently had a myocardial infarction (MI) has started therapy with a beta blocker. The nurse explains that the main purpose of the beta blocker for this patient is to a cause vasodilation of the coronary arteries. $\mathbf{b}$ prevent hypertension. c increase conduction through the SA node. d protect the heart from circulating catecholamines.
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Step-by-Step Explanations

QUESTION

How do beta blockers decrease cardiac workload to alleviate conditions like angina?

STEP-BY-STEP ANSWER:

Step 1: Beta blockers bind to beta-adrenergic receptors on the heart, preventing adrenaline and noradrenaline from exerting their effects.
Step 2: By blocking these receptors, the drugs decrease the heart rate and the force of myocardial contraction.
Step 3: The reduction in heart rate and contractility lowers the oxygen demand of the heart muscle.
Step 4: This decreased demand helps manage conditions like angina by reducing the stress on the heart.
Final Answer: Beta blockers reduce cardiac workload by decreasing heart rate and contraction force, thereby lowering oxygen consumption in the heart.

Beta Blockers Mechanism

QUESTION

How do alpha blockers contribute to the management of hypertension?

STEP-BY-STEP ANSWER:

Step 1: Alpha blockers block alpha-adrenergic receptors in the vascular smooth muscle.
Step 2: This blocking action results in vasodilation, or the widening of blood vessels.
Step 3: Vasodilation reduces vascular resistance, leading to a decrease in blood pressure.
Step 4: This mechanism helps manage hypertension and can also improve blood flow in patients with related conditions.
Final Answer: Alpha blockers manage hypertension by causing vasodilation, which lowers vascular resistance and blood pressure.

Alpha Blockers Mechanism

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Common Mistakes

  • Confusing the roles of alpha and beta blockers, leading to misinterpretation of their effects on blood pressure and cardiac workload.
  • Overlooking the potential adverse effects such as hypotension, bradycardia, and bronchoconstriction when administering these drugs.
  • Failing to appropriately tailor nursing interventions and patient education to the specific mechanisms and side effect profiles of the medications.
  • Assuming that all adrenergic-blocking drugs are interchangeable without considering the distinct differences in receptor targeting and clinical applications.