D116 Unit 4 Study Guide

Grace J.
January 2, 2026January 2, 2026
D116, MSN, Western Governors University

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Western Governors University

D116 Advanced Pharmacology for the Advanced Practice Nurse

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Unit 4 Study Guide

How is Heart Failure Severity Classified According to the NYHA and ACC/AHA Systems?

Heart failure (HF) severity is typically evaluated using two key classification systems: the New York Heart Association (NYHA) functional classification and the American College of Cardiology/American Heart Association (ACC/AHA) staging system. These two frameworks complement each other, with the NYHA system focusing primarily on the patient’s symptoms and physical limitations, whereas the ACC/AHA system emphasizes the progression of structural heart disease and stages of illness, including asymptomatic phases.

NYHA Functional Classification

The NYHA classification is widely applied in clinical practice and categorizes patients based on how heart failure symptoms impact their daily physical activity. This scale helps clinicians tailor treatment intensity and predict patient outcomes.

NYHA Class	Clinical Description
Class I	No limitation of physical activity; ordinary activities cause no symptoms
Class II	Mild limitation; symptoms like fatigue or shortness of breath with ordinary exertion
Class III	Marked limitation; symptoms appear with less than ordinary activity
Class IV	Unable to perform any physical activity without discomfort; symptoms may be present even at rest

ACC/AHA Heart Failure Staging

In contrast, the ACC/AHA system views heart failure as a progressive disease, highlighting the importance of early identification and prevention even before symptoms emerge. It divides heart failure into four stages reflecting structural heart changes and symptom development.

ACC/AHA Stage	Description
Stage A	At high risk for HF but without structural heart disease or symptoms
Stage B	Structural heart disease present without signs or symptoms of HF
Stage C	Structural heart disease with current or past symptoms of HF
Stage D	Advanced, treatment-resistant HF requiring specialized care

The ACC/AHA stages are irreversible and emphasize prevention strategies at the earliest stages to slow disease progression (American College of Cardiology/American Heart Association, 2022).

What is the First-Line Treatment for Hypertension?

The cornerstone of hypertension management is lifestyle modification. These interventions aim to address controllable risk factors and often reduce or delay the need for medication. Effective lifestyle changes include:

Reducing dietary sodium intake
Achieving and maintaining a healthy body weight
Engaging in regular aerobic exercise
Limiting alcohol consumption
Quitting smoking
Following heart-healthy eating patterns such as the DASH (Dietary Approaches to Stop Hypertension) diet

These approaches have been demonstrated to effectively lower blood pressure and improve overall cardiovascular health (Whelton et al., 2018).

How Should Hypertension be Managed in Patients with Asthma?

In patients who have both asthma and hypertension, angiotensin-converting enzyme (ACE) inhibitors are generally preferred as antihypertensive agents. These medications, identifiable by the suffix “-pril,” do not induce bronchoconstriction, unlike nonselective beta-blockers, making them safer for individuals with reactive airway diseases. However, monitoring for side effects such as persistent cough is necessary, and switching to an angiotensin receptor blocker (ARB) may be required if cough develops (Brunton, Hilal-Dandan, & Knollmann, 2023).

Why Are ACE Inhibitors Contraindicated During Pregnancy?

ACE inhibitors are contraindicated in pregnancy due to their teratogenic effects, especially during the second and third trimesters. Fetal exposure can lead to severe complications such as hypotension, impaired kidney development, decreased amniotic fluid volume, skull malformations, lung underdevelopment, hyperkalemia, and even fetal demise. Pregnant women on ACE inhibitors should discontinue these drugs promptly and receive alternative therapies under medical supervision (Brunton et al., 2023).

What is the Mechanism of Action, Common Side Effects, and Contraindications of HMG-CoA Reductase Inhibitors?

HMG-CoA reductase inhibitors, commonly known as statins, lower LDL cholesterol by inhibiting the rate-limiting enzyme in cholesterol synthesis in the liver. This inhibition leads to increased LDL receptor expression on liver cells, which enhances removal of LDL cholesterol from the bloodstream.

Common adverse effects include headaches, gastrointestinal complaints (e.g., indigestion, constipation), and skin reactions. Serious but rare effects include muscle pain, myopathy, and rhabdomyolysis. Statins are contraindicated in pregnancy and lactation due to potential harm to the fetus and infant. Caution is advised when combined with other medications that interfere with cytochrome P450 enzymes, such as CYP3A4 inhibitors, to avoid toxicity (Brunton et al., 2023).

Which Patients Should Avoid ACE Inhibitors?

ACE inhibitors are contraindicated in patients with:

A history of angioedema caused by previous ACE inhibitor use
Pregnancy
Known neutropenia (low white blood cell count)

Moreover, these drugs should be used cautiously in individuals with bilateral renal artery stenosis or significant renal impairment due to the increased risk of kidney injury (Brunton et al., 2023).

What Are the Main Adverse Effects of Aspirin and Warfarin?

The most significant side effect associated with aspirin and warfarin is an increased risk of bleeding. This can present as gastrointestinal bleeding, intracranial hemorrhage, or excessive bruising. The risk escalates when these medications are combined or used in patients with bleeding disorders or poorly controlled hypertension (Gulanick & Myers, 2022).

What Are the Signs of Digoxin Toxicity? What Are Therapeutic and Toxic Serum Levels?

Digoxin has a narrow therapeutic window. Therapeutic serum levels are generally between 0.5 and 0.8 ng/mL. Levels above this range increase the risk of toxicity.

Symptoms of digoxin toxicity include gastrointestinal upset (nausea, vomiting, anorexia), fatigue, visual disturbances such as blurred or yellow vision, and dangerous cardiac arrhythmias. Any abnormal heart rhythm in a patient receiving digoxin warrants immediate serum level assessment (Brunton et al., 2023).

What Precautions Should Be Taken When Prescribing Theophylline? What Medications Interact with Theophylline?

Theophylline is used for long-term control of chronic stable asthma. Patients should be counseled not to double doses if a dose is missed. Since caffeine can increase theophylline toxicity by slowing its clearance, patients should limit caffeinated beverages.

Drug interactions include enzyme inducers (e.g., phenobarbital, phenytoin, rifampin), which reduce theophylline levels, and enzyme inhibitors (e.g., cimetidine, fluoroquinolones like ciprofloxacin), which increase the risk of toxicity (National Asthma Education and Prevention Program, 2020).

What is the Relationship Between Thiazide Diuretics and Calcium Excretion?

Thiazide diuretics reduce the amount of calcium excreted in urine by promoting calcium reabsorption in the distal convoluted tubule of the nephron. This effect can slightly raise serum calcium levels while lowering urinary calcium. This property may be beneficial in preventing calcium-based kidney stones but requires monitoring in patients predisposed to hypercalcemia (Brunton et al., 2023).

What Are the Side Effects of Mucolytics?

Mucolytics decrease the thickness of respiratory mucus, enhancing cough effectiveness. Although generally well tolerated, mucolytics may provoke bronchospasm in susceptible individuals, particularly those with asthma, necessitating careful monitoring during use (Gulanick & Myers, 2022).

How Do Sympathomimetics Work?

Sympathomimetics relieve nasal congestion by stimulating alpha-1 adrenergic receptors in the nasal blood vessels. This stimulation causes vasoconstriction, which decreases blood flow and reduces swelling of the nasal mucosa, thereby improving airflow. However, excessive or prolonged use may lead to rebound nasal congestion (Brunton et al., 2023).

What Are the Side Effects and Drug Interactions of Glucocorticoids? What Specific Assessments Are Needed?

Long-term glucocorticoid use can cause a wide range of adverse effects, including:

Osteoporosis
Increased infection risk
Impaired wound healing
Hyperglycemia
Muscle weakness
Fluid and electrolyte imbalance
Growth suppression in children
Psychological effects such as mood swings or psychosis
Cataracts and glaucoma
Peptic ulcers
Cushing syndrome
Adrenal suppression

Monitoring should include bone density scans, blood glucose, electrolytes, eye examinations, and infection surveillance. Glucocorticoids interact with potassium-depleting drugs, NSAIDs, insulin or oral hypoglycemics, and vaccines, necessitating careful management (Brunton et al., 2023).

What Is the Stepwise Approach to Asthma Management? Which Medication Classes Are Used in Each Step? How Are Short-Acting and Long-Acting Treatments Differentiated?

Asthma treatment is guided by a stepwise approach that escalates based on symptom severity and control. Short-acting beta-agonists (SABAs) are used for quick relief of acute symptoms, while long-acting agents such as inhaled corticosteroids (ICS) and long-acting beta-agonists (LABAs) are used for ongoing maintenance. As asthma severity increases, additional medications such as leukotriene modifiers, biologics, or systemic corticosteroids may be incorporated (National Asthma Education and Prevention Program, 2020).

Which Antitussives and Decongestants Are Safe During Pregnancy? Which Are Contraindicated?

Acceptable Medications:

Medication	Notes
Diphenhydramine (Benadryl®)	Generally safe
Dextromethorphan (Robitussin®)	Use with caution depending on trimester
Guaifenesin (Mucinex®)	Considered safe
Pseudoephedrine	Safe only after the first trimester
Saline nasal sprays, nasal strips, Neti pots	Non-pharmacologic and safe

Contraindicated Medications:

Medication	Reason for Avoidance
Pseudoephedrine (first trimester)	Potential teratogenic risk
Phenylephrine	Risk of fetal harm
Benzonatate	Lack of safety data
Dextromethorphan	Use with caution in early pregnancy

Pregnancy requires careful consideration to minimize fetal risk while managing maternal symptoms (Brunton et al., 2023).

References

American College of Cardiology/American Heart Association. (2022). Guideline for the management of heart failure. Journal of the American College of Cardiology, 79(17), e263–e421. https://doi.org/10.1016/j.jacc.2021.12.012

Brunton, L. L., Hilal-Dandan, R., & Knollmann, B. C. (2023). Goodman & Gilman’s: The pharmacological basis of therapeutics (14th ed.). McGraw-Hill Education.

Gulanick, M., & Myers, J. L. (2022). Nursing care plans: Diagnoses, interventions, and outcomes (10th ed.). Elsevier.