NURS 6521 Week 1 Discussion Pharmacokinetics and Pharmacodynamics – Online Nursing Essays
NURS 6521 Week 1 Discussion Pharmacokinetics and Pharmacodynamics
Working in an intermediate care unit, I get to see patients from all races with different healthcare needs and conditions. One obvious thing observed from the so many patients that come into the facility is the prevalence of diabetes, hypertension and chronic obstructive pulmonary disease (COPD) in patients ages 20 years and above. Though the diseases are common, the types of medications used in treating them may differ in dose, brand, and pricing. When prescribing medications for an individual patient, the physician considers the effects of the drugs and the mechanism of their action on that particular patient.
Let us consider a 75-year-old male patient who is admitted for uncontrolled Diabetes. The patient has a past medical history of Diabetes type II and takes metformin to control his glucose but had not been able to afford the refills for his medication. On admission the patient presented with a blood glucose of 288 mg/dl and was ordered Lispro on a low dose sliding scale with blood glucose monitoring before meals and at bedtime. The patient was assigned to a young nurse who had recently just started working on the unit. Just before the lunch trays came in, the nurse went to review the patients’ blood glucose levels the nurse tech had checked. Without paying much attention, the nurse drew up 8 units of lispro insulin and administered it to the patient for what she thought was a blood sugar of 288mg/dl. After about 20 minutes the nurse discovered that the patient was sweating a lot and had an increased heart rate with slight shivers. The young nurse called the attention of an older nurse and explained all the care she had provided to the patient prior to discovering his current state. The two nurses reviewed the documentation on the computer and saw that the patients’ last blood glucose check was 98mg/dl and not 288mg/dl as the young nurse had thought it was. The older nurse immediately got a glucometer and checked the patients’ blood glucose which was now 52mg/dl, and also discovered that the patient had not eaten anything. The older nurse immediately followed the establishment’s protocol and administered 1 gram of glucagon to the patient, checked his blood glucose which had gone up slightly and then administered another gram, checked his blood glucose again, and then provided the patient with a small cup of orange juice and a cracker.
As nurse practitioners, it is important to know and understand the pharmacokinetics and pharmacodynamic processes. Pharmacokinetics is the process of a drug being absorbed, distributed, metabolized, and excreted from the body (Rosenthal and Burchum, 2021). Pharmacodynamics is the relationship between drug concentration at the site of action and the resulting effects which include the time and severity of therapeutic and adverse effects (DiPiro, 2008).
Lispro Insulin is a rapid-acting insulin that has a short duration of action which is used to improve blood glucose management in patients with diabetes (Rosenthal and Burchum, 2021). It is more effective than the normal human insulin in improving and helping to maintain blood glucose control (Campbell et al., 1996). Factors that might influence the pharmacokinetics and pharmacodynamics of insulin are the size of the dose, the injected volume and the insulin concentration, vigorously rubbing the site of the injection, increase in temperature which increases absorption rate, site of the injection (absorption is faster when administered in the abdomen), and exercising of extremity within an hour of injection can speed up absorption (Donner and Sarkar, 2019). The patient received a large dose of insulin for an inaccurate blood glucose reading and presented with a hypoglycemic reaction due to the large amount of insulin that was administered.
A personalized care plan for the patient based on influencing factors and the patients history would be to set goals for the patient that include effective treatments to normalize and manage blood glucose levels, decrease the risk for hypoglycemic or hyperglycemic events using insulin medication, diet, and exercise, informing and educating the patient on the importance of compliance with medication regimen and importance of monitoring blood glucose, providing the patient with prescription savings or discount cards like Good Rx, and providing the patient with location to local community clinics that help with providing low-cost prescription medications.
Ensuring that the patient is properly educated and provided with the necessary resources to provide for his medication will promote his participation in self-care and ensure his compliance with monitoring and maintaining manageable blood glucose levels.
References:
Campbell, R. K., Campbell, L. K., & White, J. R. (1996, November). Insulin lispro: its role in the treatment of diabetes mellitus. The Annals of pharmacotherapy. https://pubmed.ncbi.nlm.nih.gov/8913409/.
Donner, T., & Sarkar, S. (2019). Insulin – Pharmacology, Therapeutic Regimens, and Principles of Intensive Insulin Therapy. Endotext [Internet]. https://www.ncbi.nlm.nih.gov/books/NBK278938/.
DiPiro, J. T. (2008). Pharmacotherapy: A pathophysiologic approach. McGraw-Hill Medical.
Rosenthal, L. D., & Burchum, J. R. (2021). Lehne’s pharmacotherapeutics for advanced practice nurses and physician assistants (2nd ed.) Elsevier.
Discussion: Pharmacokinetics and Pharmacodynamics
As an advanced practice nurse assisting physicians in the diagnosis and treatment of disorders, it is important to not only understand the impact of disorders on the body, but also the impact of drug treatments on the body. The relationships between drugs and the body can be described by pharmacokinetics and pharmacodynamics.
Pharmacokinetics describes what the body does to the drug through absorption, distribution, metabolism, and excretion, whereas pharmacodynamics describes what the drug does to the body.
Photo Credit: Getty Images/Ingram Publishing
When selecting drugs and determining dosages for patients, it is essential to consider individual patient factors that might impact the patient’s pharmacokinetic and pharmacodynamic processes. These patient factors include genetics, gender, ethnicity, age, behavior (i.e., diet, nutrition, smoking, alcohol, illicit drug abuse), and/or pathophysiological changes due to disease.
For this Discussion, you reflect on a case from your past clinical experiences and consider how a patient’s pharmacokinetic and pharmacodynamic processes may alter his or her response to a drug.
NURS 6521 Week 1 Discussion Pharmacokinetics and Pharmacodynamics
To Prepare
- Review the Resources for this module and consider the principles of pharmacokinetics and pharmacodynamics.
- Reflect on your experiences, observations, and/or clinical practices from the last 5 years and think about how pharmacokinetic and pharmacodynamic factors altered his or her anticipated response to a drug.
- Consider factors that might have influenced the patient’s pharmacokinetic and pharmacodynamic processes, such as genetics (including pharmacogenetics), gender, ethnicity, age, behavior, and/or possible pathophysiological changes due to disease.
- Think about a personalized plan of care based on these influencing factors and patient history in your case study.
By Day 3 of Week 1
Post a description of the patient case from your experiences, observations, and/or clinical practice from the last 5 years. Then, describe factors that might have influenced pharmacokinetic and pharmacodynamic processes of the patient you identified. Finally, explain details of the personalized plan of care that you would develop based on influencing factors and patient history in your case. Be specific and provide examples.
By Day 6 of Week 1
Read a selection of your colleagues’ responses and respond to at least two of your colleagues on two different days by suggesting additional patient factors that might have interfered with the pharmacokinetic and pharmacodynamic processes of the patients they described. In addition, suggest how the personalized plan of care might change if the age of the patient were different and/or if the patient had a comorbid condition, such as renal failure, heart failure, or liver failure.
Note: For this Discussion, you are required to complete your initial post before you will be able to view and respond to your colleagues’ postings. Begin by clicking on the “Post to Discussion Question” link, and then select “Create Thread” to complete your initial post. Remember, once you click on Submit, you cannot delete or edit your own posts, and you cannot post anonymously. Please check your post carefully before clicking on Submit!
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Submission and Grading Information
Grading Criteria
To access your rubric:
Week 1 Discussion Rubric
Post by Day 3 of Week 1 and Respond by Day 6 of Week 1
To Participate in this Discussion:
Week 1 Discussion
Week 1: Basic Pharmacotherapeutic Concepts/Ethical and Legal Aspects of Prescribing
How do beta-blockers work? What exactly do antibiotics do to the bacteria they target? What effects does an anti-depressant have on blood flow?
Questions like these are related to the underlying pharmacokinetic and pharmacodynamic processes of pharmacotherapeutics. As an advanced practice nurse, understanding these fundamental pharmacotherapeutic concepts is important to ensure that the prescription drugs you recommend for your patients will be safe and effective to treat and/or manage their symptoms. Additionally, as the advanced practice nurse, it is your responsibility to ensure that when prescribing prescription drugs, you adhere to the ethical and legal principles set forth for prescribing drugs as an added layer of protection and safety for the patients you will treat.
This week, you will analyze factors that may influence pharmacokinetic and pharmacodynamics processes of a patient and assess the details of a personalized plan of care that you develop based on influencing factors and patient history. You will also evaluate and analyze ethical and legal implications and practices related to prescribing drugs, including disclosure and nondisclosure, and analyze the process of writing prescriptions to avoid medication errors.
Learning Objectives
Students will:
- Analyze factors that influence pharmacokinetic and pharmacodynamic processes in patients
- Assess patient factors and history to develop personalized plans of care
- Evaluate ethical and legal implications related to prescribing drugs
- Analyze ethical and legal practices of prescribing drugs
- Analyze strategies to address disclosure and nondisclosure
- Justify advanced practice nurse strategies to guide prescription drug decision-making
- Analyze the process of writing prescriptions to avoid medication errors
Learning Resources
Required Readings (click to expand/reduce)
Rosenthal, L. D., & Burchum, J. R. (2021). Lehne’s pharmacotherapeutics for advanced practice nurses and physician assistants (2nd ed.) St. Louis, MO: Elsevier.
- Chapter 1, “Prescriptive Authority” (pp. 1–3)
- Chapter 2, “Rational Drug Selection and Prescription Writing” (pp. 4–7)
- Chapter 3, “Promoting Positive Outcomes of Drug Therapy” (pp. 8–12)
- Chapter 4, “Pharmacokinetics, Pharmacodynamics, and Drug Interactions” (pp. 13–33)
- Chapter 5, “Adverse Drug Reactions and Medication Errors” (pp. 34–42)
- Chapter 6, “Individual Variation in Drug Response” (pp. 43–45)
This website outlines the code of federal regulations for prescription drugs.
This website details key aspects of drug registration.
This resource introduces the code of ethics for nurses and highlights critical aspects for ethical guideline development, interpretation, and application in practice.
This article provides NPs with information regarding state-based laws for NP prescribing.
The authors of this article assess the impact of a pharmacist‐led educational intervention on family nurse practitioner (FNP) students’ prescribing skills, perception of preparedness to prescribe, and perception of pharmacist as collaborator.
Required Media (click to expand/reduce)
NURS 6521 Week 1 Discussion Pharmacokinetics and Pharmacodynamics
Introduction to Advanced Pharmacology
Meet Dr. Terry Buttaro, associate professor of practice at Simmons College of Nursing and Health Sciences as she discusses the importance of pharmacology for the advanced practice nurse. (8m)
Select Grid View or List View to change the rubric’s layout.
Content
Name: NURS_6521_Week1_Discussion_Rubric
| Excellent | Good | Fair | Poor | ||
| Main Posting | Points Range: 45 (45%) – 50 (50%)
Answers all parts of the discussion question(s) expectations with reflective critical analysis and synthesis of knowledge gained from the course readings for the module and current credible sources. Supported by at least three current, credible sources. Written clearly and concisely with no grammatical or spelling errors and fully adheres to current APA manual writing rules and style. |
Points Range: 40 (40%) – 44 (44%)
Responds to the discussion question(s) and is reflective with critical analysis and synthesis of knowledge gained from the course readings for the module. At least 75% of post has exceptional depth and breadth. Supported by at least three credible sources. Written clearly and concisely with one or no grammatical or spelling errors and fully adheres to current APA manual writing rules and style. |
Points Range: 35 (35%) – 39 (39%)
Responds to some of the discussion question(s). One or two criteria are not addressed or are superficially addressed. Is somewhat lacking reflection and critical analysis and synthesis. Somewhat represents knowledge gained from the course readings for the module. Post is cited with two credible sources. Written somewhat concisely; may contain more than two spelling or grammatical errors. Contains some APA formatting errors. |
Points Range: 0 (0%) – 34 (34%)
Does not respond to the discussion question(s) adequately. Lacks depth or superficially addresses criteria. Lacks reflection and critical analysis and synthesis. Does not represent knowledge gained from the course readings for the module. Contains only one or no credible sources. Not written clearly or concisely. Contains more than two spelling or grammatical errors. Does not adhere to current APA manual writing rules and style. |
|
| Main Post: Timeliness | Points Range: 10 (10%) – 10 (10%)
Posts main post by day 3 |
Points Range: 0 (0%) – 0 (0%) | Points Range: 0 (0%) – 0 (0%) | Points Range: 0 (0%) – 0 (0%)
Does not post by day 3 |
|
| First Response | Points Range: 17 (17%) – 18 (18%)
Response exhibits synthesis, critical thinking, and application to practice settings. Responds fully to questions posed by faculty. Provides clear, concise opinions and ideas that are supported by at least two scholarly sources. Demonstrates synthesis and understanding of learning objectives. Communication is professional and respectful to colleagues. . Responses to faculty questions are fully answered, if posed. Response is effectively written in standard, edited English. |
Points Range: 15 (15%) – 16 (16%)
Response exhibits synthesis, critical thinking, and application to practice settings. Responds fully to questions posed by faculty. Provides clear, concise opinions and ideas that are supported by at least two scholarly sources. Demonstrates synthesis and understanding of learning objectives. Communication is professional and respectful to colleagues. . Responses to faculty questions are fully answered, if posed. Response is effectively written in standard, edited English. |
Points Range: 13 (13%) – 14 (14%)
Response is on topic and may have some depth. Responses posted in the discussion may lack effective professional communication. Responses to faculty questions are somewhat answered, if posed. Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited. |
Points Range: 0 (0%) – 12 (12%)
Response may not be on topic and lacks depth. Responses posted in the discussion lack effective professional communication. Responses to faculty questions are missing. No credible sources are cited. |
|
| NURS 6521 Week 1 Discussion Pharmacokinetics and Pharmacodynamics
Second Response |
Points Range: 16 (16%) – 17 (17%)
Response exhibits synthesis, critical thinking, and application to practice settings. Responds fully to questions posed by faculty. Provides clear, concise opinions and ideas that are supported by at least two scholarly sources. Demonstrates synthesis and understanding of learning objectives. Communication is professional and respectful to colleagues. . Responses to faculty questions are fully answered, if posed. Response is effectively written in standard, edited English. |
Points Range: 14 (14%) – 15 (15%)
Response exhibits critical thinking and application to practice settings. Communication is professional and respectful to colleagues. Responses to faculty questions are answered, if posed. Provides clear, concise opinions and ideas that are supported by two or more credible sources. Response is effectively written in standard, edited English. |
Points Range: 12 (12%) – 13 (13%)
Response is on topic and may have some depth. Responses posted in the discussion may lack effective professional communication. Responses to faculty questions are somewhat answered, if posed. . Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited. |
Points Range: 0 (0%) – 11 (11%)
Response may not be on topic and lacks depth. Responses posted in the discussion lack effective professional communication. Responses to faculty questions are missing. No credible sources are cited. |
|
| Participation | Points Range: 5 (5%) – 5 (5%)
Meets requirements for participation by posting on three different days. |
Points Range: 0 (0%) – 0 (0%) | Points Range: 0 (0%) – 0 (0%) | Points Range: 0 (0%) – 0 (0%)
Does not meet requirements for participation by posting on 3 different days |
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| Total Points: 100 | |||||
Name: NURS_6521_Week1_Discussion_Rubric
Pharmacokinetics and Pharmacodynamics
When prescribing medication, it is crucial to consider several individual patient factors that might affect the pharmacokinetic and pharmacodynamic process (Reeve et al., 2017). For instance, while working with the geriatric population, I encountered an 85-year-old female patient with a history of atrial fibrillation and serum creatine of 1.8mg/dl. The patient was prescribed digoxin to help manage the rapid heart rate. A maintenance dose of 125mcg tabs once a day was decided based on the patient’s pharmacodynamic and pharmacokinetic processes.
Advanced age is characterized by reduced functionality of several regular body processes responsible for functional integration between different cells and organs. The 85-year-old patient displayed several pharmacokinetic changes, with the main ones being a reduction in hepatic and renal clearance and decreased distribution volume of water-soluble drugs leading to higher serum levels (Drenth‐van Maanen et al., 2019). Consequently, some of the pharmacokinetic changes associated with the patient’s advanced age include increased sensitivity to drugs like digoxin.
Serum creatine of 1.8mg/dl is quite high indicating that the patient’s kidneys are not functioning properly. However, since approximately 67% of digoxin undergoes renal clearance, it was necessary to calculate the standard renal clearance of the drug, which is 6 liters per hour per 70 kg body weight, with a creatinine clearance of 100 mL/min (Holford, 2017). The patient’s creatinine clearance is however reduced hence the need to administer a lower dose of the drug. A once-daily dosing frequency is thus recommended with a bioavailability of 0.7 that requires 127 mcg/day as the daily maintenance dose. The dose should however be monitored closely for further changes.
References
Drenth‐van Maanen, A. C., Wilting, I., & Jansen, P. A. F. (2019). Prescribing medicines to older people—How to consider the impact of aging on human organ and body functions. British Journal of Clinical Pharmacology, 86(10), 1921–1930. https://doi.org/10.1111/bcp.14094
Holford N.G. (2017). Pharmacokinetics & pharmacodynamics: rational dosing & the time course of drug action. Katzung B.G.(Ed.), Basic & Clinical Pharmacology, 14e. McGraw Hill. https://accessmedicine.mhmedical.com/content.aspx?bookid=2249§ionid=175215748
Reeve, E., Trenaman, S. C., Rockwood, K., & Hilmer, S. N. (2017). Pharmacokinetic and pharmacodynamic alterations in older people with dementia. Expert Opinion on Drug Metabolism & Toxicology, 13(6), 651–668. https://doi.org/10.1080/17425255.2017.1325873
