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 section on drug profiles outlines the diverse roles of several medications including alpha blockers, beta blockers, antiparkinson agents, and alkylating drugs. It emphasizes the mechanisms by which these drugs operate, the importance of pharmacokinetics, and the need for awareness of drug interactions and contraindications. The clinical applications, such as treating extravasation injuries with phentolamine and managing BPH with tamsulosin, underscore the practical relevance of these drugs in patient care.

Learning Objectives

1

Describe the mechanisms of action of various drug profiles including alpha blockers, beta blockers, antiparkinson agents, and alkylating drugs.

2

Explain the roles of pharmacokinetic parameters and the significance of drug interactions and contraindications in patient care.

3

Analyze clinical applications of these drugs, such as the use of phentolamine in extravasation injuries and tamsulosin in BPH treatment.

4

Evaluate the impact of these medications on conditions like hypertension, Parkinson's disease, benign prostatic hyperplasia (BPH), and cancer.

Key Concepts

CONCEPT

DEFINITION

Alpha Blockers

Drugs that inhibit alpha-adrenergic receptors to produce vasodilation and relieve conditions such as hypertension and BPH.

Beta Blockers

Medications that block beta-adrenergic receptors, reducing heart rate and blood pressure, often used in treating cardiovascular conditions.

Antiparkinson Agents

Medications used to manage Parkinson's disease symptoms typically by balancing neurotransmitters in the brain.

Alkylating Drugs

Chemotherapeutic agents that work by adding alkyl groups to DNA, thereby inhibiting cancer cell replication.

Pharmacokinetic Parameters

Properties that describe the absorption, distribution, metabolism, and excretion of drugs within the body.

Drug Interactions and Contraindications

Considerations regarding how one drug may affect another's efficacy or safety, including situations when a drug should not be used.

Phentolamine

An alpha blocker used clinically to treat extravasation injuries by reversing vasoconstriction.

Tamsulosin

A selective alpha blocker used to alleviate symptoms of benign prostatic hyperplasia (BPH) by relaxing smooth muscles in the prostate and bladder neck.

Example Problems

Example 1

The nurse is monitoring a patient who is receiving antithrombolytic therapy in the emergency department because of a possible MI. Which adverse effect would be of the greatest concern at this time? a Dizziness b Blood pressure of $130 / 98 \mathrm{~mm} \mathrm{Hg}$ c Slight bloody oozing from the IV insertion site d Irregular heart rhythm

Example 2

A patient is receiving instructions regarding warfarin therapy and asks the nurse about what medications she can take for headaches. The nurse will tell her to avoid which type of medication? a Opioids $\mathrm{b}$ acetaminophen (Tylenol) c NSAIDs d There are no restrictions while taking warfarin.

Example 3

The nurse is teaching a patient about self-administration of enoxaparin (Lovenox). Which statement should be included in this teaching session? a "We will need to teach a family member how to give this drug in your arm." b "This drug is given in the folds of your abdomen, but at least 2 inches away from your navel." c"This drug needs to be taken at the same time every day with a full glass of water." d "Be sure to massage the injection site thoroughly after giving the drug."

Example 4

A patient is receiving dabigatran (Pradaxa), $150 \mathrm{mg}$ twice daily, as part of treatment for atrial fibrillation. Which condition, if present, would be a concern if the patient were to receive this dose? a Asthma b Renal impairment $c$ History of myocardial infarction d Elevated liver enzymes

Example 5

A patient has received a double dose of heparin during surgery and is bleeding through the incision site. While the surgeons are working to stop the bleeding at the incision site, the nurse will prepare to take what action at this time? a Give IV vitamin $\mathrm{K}$ as an antidote b Give IV protamine sulfate as an antidote c Call the blood bank for an immediate platelet transfusion d Obtain an order for packed red blood cells
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Step-by-Step Explanations

QUESTION

How do alpha blockers aid in the treatment of hypertension and BPH?

STEP-BY-STEP ANSWER:

Step 1: Recognize that alpha blockers inhibit alpha-adrenergic receptors located in vascular smooth muscle.
Step 2: The inhibition of these receptors leads to vasodilation, lowering blood pressure in hypertension.
Step 3: In the treatment of BPH, alpha blockers relax the smooth muscle in the prostate and bladder neck, improving urine flow.
Final Answer: Alpha blockers decrease blood pressure by reducing vascular resistance and mitigate BPH symptoms by relaxing smooth muscles.

Alpha Blockers

QUESTION

Describe the mechanism by which beta blockers manage cardiovascular conditions.

STEP-BY-STEP ANSWER:

Step 1: Understand that beta blockers target beta-adrenergic receptors in the heart and blood vessels.
Step 2: Blocking these receptors results in a decrease in heart rate and force of contraction.
Step 3: These effects reduce myocardial oxygen demand, thereby aiding in the management of various heart conditions.
Final Answer: Beta blockers improve cardiovascular health by lowering heart rate and contractility, reducing the strain on the heart.

Beta Blockers

QUESTION

What role do antiparkinson agents play in managing Parkinson's disease?

STEP-BY-STEP ANSWER:

Step 1: Identify that Parkinson's disease is associated with a deficit of dopamine.
Step 2: Antiparkinson agents aim to restore the balance by either increasing dopamine levels or mimicking its action.
Step 3: They work through various mechanisms such as inhibiting the breakdown of dopamine or stimulating dopamine receptors.
Final Answer: Antiparkinson agents alleviate motor symptoms of Parkinson's disease by enhancing dopaminergic activity in the brain.

Antiparkinson Agents

QUESTION

How do alkylating drugs function in the treatment of cancer?

STEP-BY-STEP ANSWER:

Step 1: Recognize that alkylating drugs add alkyl groups to DNA molecules.
Step 2: This process causes cross-linking of DNA strands or mispairing of nucleotide bases.
Step 3: Disruption of DNA structure interferes with replication and ultimately leads to cell death.
Final Answer: Alkylating drugs combat cancer by modifying DNA structure, thereby inhibiting cell replication and promoting cell death.

Alkylating Drugs

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Common Mistakes

  • Confusing the specific target receptors between alpha and beta blockers.
  • Overlooking the importance of pharmacokinetic parameters when determining drug dosage and interactions.
  • Assuming that all antiparkinson agents work through the same mechanism.
  • Ignoring contraindications and potential drug interactions when prescribing alkylating drugs or other complex therapies.