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 details the profiles of various drug classes including alpha blockers, beta blockers, alkylating agents, and cytotoxic antibiotics. It emphasizes the importance of understanding each drug's mechanism of action, clinical uses, pharmacokinetics, adverse effects, contraindications, and potential drug interactions. With detailed case studies of phentolamine and tamsulosin, the chapter illustrates how precision in dosage and thorough drug compatibility assessments are vital in high-risk settings such as emergency care and oncology. Overall, this information provides a comprehensive guide for safe and effective drug administration.

Learning Objectives

1

Identify and explain the different classes of drugs covered including alpha blockers, beta blockers, alkylating agents, and cytotoxic antibiotics.

2

Analyze the mechanisms of action, clinical uses, pharmacokinetics, adverse effects, contraindications, and drug interactions of these drugs.

3

Interpret the detailed profiles of specific drugs such as phentolamine and tamsulosin and their applications in managing conditions like hypertension and BPH.

4

Discuss the importance of dosage precision and drug compatibility in high-risk settings such as oncology and emergency care.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

A class of drugs that inhibit the alpha-adrenergic receptors, used primarily to manage high blood pressure and conditions like benign prostatic hyperplasia (BPH).

Beta Blockers

Medications that reduce blood pressure by blocking the effects of adrenaline on beta receptors, thereby lowering heart rate and contractility.

Alkylating Agents

Chemotherapeutic drugs that work by adding alkyl groups to DNA, leading to cell death, commonly used in oncology.

Cytotoxic Antibiotics

A group of drugs that inhibit cell division by interfering with DNA or protein synthesis, also used primarily in cancer treatments.

Phentolamine

An alpha blocker used in diagnosing and managing hypertension and treating extravasation injuries, particularly effective when rapid drug action is needed.

Tamsulosin

A selective alpha-1 blocker primarily used to treat benign prostatic hyperplasia (BPH) by relaxing the muscles in the prostate and bladder neck.

Dosage Precision

The careful determination and administration of the appropriate drug dose, critical in ensuring efficacy and minimizing adverse effects, especially in high-risk therapy settings.

Drug Compatibility

The assessment of potential interactions between drugs and ensuring that they can be safely co-administered without adverse effects or loss of efficacy.

Example Problems

Example 1

Which is the most appropriate timing regarding the nurse's administration of a rapid-acting insulin to a hospitalized patient? a Give it 15 minutes before the patient begins a meal. b Give it $1 / 2$ hour before a meal. c Give it 1 hour after a meal. d The timing of the insulin injection does not matter with insulin lispro.

Example 2

Which statement is appropriate for the nurse to include in patient teaching regarding type 2 diabetes? a "Insulin injections are never used with type 2 diabetes." b "You don't need to measure your blood glucose levels because you are not taking insulin injections." c "A person with type 2 diabetes still has functioning beta cells in his or her pancreas." d "Patients with type 2 diabetes usually have better control over their diabetes than those with type 1 diabetes."

Example 3

The nurse monitoring a patient for a therapeutic response to oral antidiabetic drugs will look for a fewer episodes of diabetic ketoacidosis (DKA). b weight loss of 5 pounds. c hemoglobin A1C levels of less than $7 \%$. d glucose levels of $150 \mathrm{mg} / \mathrm{dL}$

Example 4

A patient with type 2 diabetes is scheduled for magnetic resonance imaging (MRI) with contrast dye. The nurse reviews the orders and notices that the patient is receiving metformin (Glucophage). Which action by the nurse is appropriate? a Proceed with the MRI as scheduled. b Notify the radiology department that the patient is receiving metformin. $c$ Expect to hold the metformin the day of the test and for 48 hours after the test is performed. d Call the prescriber regarding holding the metformin for 2 days before the MRI is performed.

Example 5

A patient with type 2 diabetes has a new prescription for repaglinide (Prandin). After 1 week, she calls the office to ask what to do, because she keeps missing meals. "I work right through lunch sometimes, and I'm not sure whether I need to take it. What do I need to do?" What is the nurse's best response? a "You need to try not to skip meals, but if that happens, you will need to skip that dose of Prandin." b "We will probably need to change your prescription to insulin injections because you can't eat meals on a regular basis." c "Go ahead and take the pill when you first remember that you missed it." d "Take both pills with the next meal, and try to eat a little extra to make up for what you missed at lunchtime."
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Step-by-Step Explanations

QUESTION

How do you determine the proper dosage and administration of phentolamine in a hypertensive crisis?

STEP-BY-STEP ANSWER:

Step 1: Review the patient’s medical history, current blood pressure readings, and contraindications to determine suitability for phentolamine.
Step 2: Understand the mechanism of action of phentolamine as a non-selective alpha blocker, which helps rapidly reduce blood pressure by dilating blood vessels.
Step 3: Calculate the initial dosage using established clinical guidelines, considering factors such as the patient's weight, blood pressure level, and overall condition.
Step 4: Administer the drug intravenously or as recommended, monitoring the patient continuously for blood pressure response.
Step 5: Adjust the dosage as necessary based on the patient’s response and any observed adverse effects.
Final Answer: The proper dosage of phentolamine is determined by a comprehensive assessment including patient history, clinical guidelines, and continuous monitoring to ensure both efficacy and safety during hypertensive emergencies.

Using Phentolamine in Hypertensive Emergencies

QUESTION

What are the steps to effectively use tamsulosin for the treatment of benign prostatic hyperplasia (BPH)?

STEP-BY-STEP ANSWER:

Step 1: Evaluate the patient's symptoms of BPH and confirm diagnosis through clinical tests including urinary flow study and prostate evaluation.
Step 2: Review the drug profile of tamsulosin, noting its selective action on alpha-1 receptors predominantly in the prostate and bladder neck.
Step 3: Determine the correct dosage based on the patient's condition and clinical guidelines for BPH management.
Step 4: Counsel the patient on the expected benefits, potential side effects, and the importance of adherence to the prescribed regimen.
Step 5: Initiate treatment and schedule follow-up appointments to monitor symptom improvement and adjust the dosage if necessary.
Final Answer: Effective treatment with tamsulosin for BPH involves proper diagnosis, careful dosage selection, patient counseling, and regular monitoring to optimize therapeutic outcomes.

Applying Tamsulosin in BPH Management

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Common Mistakes

  • Overlooking the significance of drug interactions, which may alter the efficacy or increase toxicity.
  • Failing to consider contraindications and individual patient factors such as comorbid conditions when selecting a drug.
  • Misinterpreting dosage guidelines, leading to either under-dosage (reducing therapeutic impact) or over-dosage (increasing adverse effects).
  • Confusing the distinct applications of different drug classes, such as using alpha blockers in situations where beta blockers are preferred.
  • Underestimating the importance of monitoring pharmacokinetic variables, which can significantly affect the clinical outcomes of drug therapy.