Pharmacology and the Nursing Process

Linda Lane Lilley, Shelly Rainforth Collins, Julie S. Snyder

ISBN #9780323087896

7th Edition

394 Questions

2,697 Students Helped

Homework Questions

Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

Chapter 3 - Lifespan Considerations emphasizes the necessity of customizing drug therapy to meet the unique needs of patients at different life stages—from pregnancy and breastfeeding to neonatal/pediatric and elderly populations. By understanding how physiological differences affect drug metabolism and efficacy, clinicians can tailor medication dosing, mitigate risks such as fetal harm, polypharmacy, and organ dysfunction, and apply a systematic nursing process for optimal care.

Learning Objectives

Explain the importance of tailoring drug therapy to different life stages, including pregnancy, breastfeeding, neonatal/pediatric, and elderly patients.

Analyze how physiological differences impact pharmacokinetics and pharmacodynamics across the lifespan.

Apply FDA risk categories and placental drug transfer concepts to minimize fetal harm during pregnancy.

Determine appropriate dosing strategies for pediatric patients based on weight or body surface area.

Identify risks associated with polypharmacy and diminished organ function in elderly patients to ensure safe medication administration.

Key Concepts

CONCEPT

DEFINITION

Lifespan Drug Therapy

The customization of medication plans according to the patient’s specific age-related physiological and developmental characteristics.

Placental Drug Transfer

The process by which drugs cross the placenta from the mother to the fetus, impacting fetal exposure and potential risk.

FDA Risk Categories

A classification system used to indicate the potential risk to the fetus when medications are used during pregnancy.

Pediatric Dosing

The practice of calculating medication doses for children based on weight or body surface area due to their developing organ systems.

Polypharmacy

The use of multiple medications by a patient, particularly common among the elderly, which increases the risk of drug interactions and adverse effects.

Pharmacokinetics

The study of how the body absorbs, distributes, metabolizes, and excretes medications.

Pharmacodynamics

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

Example Problems

Example 1

The nurse is reviewing factors that influence pharmacokinetics in the neonatal patient. Which factor puts the neonatal patient at risk with regard to drug therapy? a Immature renal system b Hyperperistalsis in the GI tract c Irregular temperature regulation d Smaller circulatory capacity

Example 2

The physiologic differences in the pediatric patient compared with the adult patient affect the amount of drug needed to produce a therapeutic effect. The nurse is aware that one of the main differences is that infants have a increased protein in circulation. b fat composition lower than $0.001 \%$. c more muscular body composition. d water composition of approximately $75 \%$.

Example 3

While teaching a 76-year-old patient about the adverse effects of his medications, the nurse encourages him to keep a journal of the adverse effects he experiences. This intervention is important for the elderly patient because of which alterations in pharmacokinetics? a Increased renal excretion of protein-bound drugs b More alkaline gastric pH, resulting in more adverse effects c Decreased blood flow to the liver, resulting in altered metabolism d Less adipose tissue to store fat-soluble drugs

Example 4

When the nurse is reviewing a list of medications taken by an 88-year-old patient, the patient says, "I get dizzy when I stand up." She also states that she has nearly fainted "a time or two " in the afternoons. Her systolic blood pressure drops 15 points when she stands up. Which type of medication may be responsible for these effects? a NSAIDs b Cardiac glycosides c Anticoagulants d Antihypertensives

Example 5

A pregnant patient who is at 32 weeks' gestation has a cold and calls the office to ask about taking an over-the-counter medication that is rated as pregnancy category A. Which answer by the nurse is correct? a "This drug causes problems in the human fetus, so you should not take this medication." $\mathbf{b}$ "This drug may cause problems in the human fetus, but nothing has been proven in clinical trials. It is best not to take this medication." c "This drug has not caused problems in animals, but no testing has been done in humans. It is probably safe to take." d "Studies indicate that there is no risk to the human fetus, so it is okay to take this medication as directed if you need it."

Step-by-Step Explanations

QUESTION

How does understanding placental drug transfer and FDA risk categories guide drug therapy decisions in pregnant patients?

STEP-BY-STEP ANSWER:

Step 1: Identify if the drug in question can cross the placental barrier.
Step 2: Review the FDA risk category for the drug to evaluate its potential harm to the fetus.
Step 3: Balance the medication’s therapeutic benefits to the mother against the potential risks to the fetus.
Step 4: Adjust dosage or seek safer alternative medications if the risk is deemed too high.
Final Answer: Effective drug therapy during pregnancy involves careful evaluation of placental transfer and risk category to minimize fetal harm while treating the mother.

Drug Therapy During Pregnancy

QUESTION

What are the key steps in calculating the appropriate dose of medication for a pediatric patient?

STEP-BY-STEP ANSWER:

Step 1: Obtain the pediatric patient’s weight or body surface area (BSA).
Step 2: Determine the standard dosage per unit of weight/BSA for the medication.
Step 3: Calculate the total appropriate dose by multiplying the standard dosage by the patient’s weight/BSA.
Step 4: Review the patient’s developmental status and organ function to ensure safe administration.
Final Answer: Pediatric dosing is accurately determined by calculating the dose based on weight or BSA with consideration of the child’s overall physiological status.

Pediatric Dosing

QUESTION

How can healthcare providers adjust drug therapy in elderly patients to minimize the risk of adverse effects?

STEP-BY-STEP ANSWER:

Step 1: Assess the elderly patient’s current medications to identify potential polypharmacy issues.
Step 2: Evaluate organ function, especially renal and hepatic functions, which may be diminished with age.
Step 3: Consider dosage adjustments and the use of alternative therapies with safer profiles.
Step 4: Monitor the patient carefully for any signs of adverse drug reactions.
Final Answer: Optimizing drug therapy for elderly patients involves evaluating polypharmacy and organ function to adjust dosages appropriately and monitor for adverse effects.

Drug Therapy for Elderly Patients

QUESTION

How does the nursing process contribute to safe and effective medication administration throughout the lifespan?

STEP-BY-STEP ANSWER:

Step 1: Assess the patient’s age-specific physiological, developmental, and pharmacologic considerations.
Step 2: Diagnose potential risks relating to drug therapy in the given life stage.
Step 3: Plan a medication administration strategy that integrates these considerations using evidence-based guidelines.
Step 4: Implement the plan by carefully monitoring the patient’s response to therapy.
Step 5: Evaluate the outcomes and make necessary adjustments to the therapy plan.
Final Answer: The nursing process supports safe medication administration by systematically considering patient-specific factors across the lifespan.

Integrating the Nursing Process

Common Mistakes

Assuming that adult dosing guidelines are applicable to pediatric or elderly patients without adjustment.
Neglecting to consider the role of placental drug transfer in pregnant patients, leading to potential fetal harm.
Overlooking the risks associated with polypharmacy and diminished organ function in the elderly.
Misinterpreting FDA risk categories, which can lead to inappropriate medication choices during pregnancy.
Failing to calculate doses based on weight or body surface area in pediatric patients, resulting in inaccurate dosing.