D118 Unit 7 Study Guide

D118 Unit 7 Study Guide

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 Western Governors University

D118 Adult Primary Care for the Advanced Practice Nurse

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D118 Unit 7 Study Guide

Differentiating Laboratory Findings in Anemia

Anemia is defined by a decrease in hemoglobin concentration, hematocrit, or red blood cell (RBC) count. Its causes are diverse, so interpreting lab results carefully is crucial for identifying the underlying issue. Potential causes include acute or chronic blood loss, bone marrow dysfunction, cancers, and kidney disease.

In acute blood loss, such as from hemorrhage or hemolysis, laboratory values are initially normal but then show a drop in hemoglobin and hematocrit. The body responds by increasing the reticulocyte count as the bone marrow produces new RBCs. Chronic blood loss, often due to gastrointestinal or gynecological problems, leads to iron deficiency anemia. This is characterized by low ferritin and serum iron, elevated total iron-binding capacity (TIBC), and smaller-than-normal RBCs (microcytosis).

Bone marrow disorders such as aplastic anemia or myelodysplastic syndromes frequently result in pancytopenia (a reduction across all blood cell types), low reticulocyte counts, and abnormal bone marrow cellularity. Anemia linked to malignancies can develop through marrow infiltration, chronic inflammation, or as an effect of chemotherapy, typically presenting as normocytic or slightly microcytic anemia alongside raised inflammatory markers. In renal failure, anemia occurs due to insufficient erythropoietin production, leading to normocytic, normochromic anemia.

What Are the Laboratory Patterns for Common Types of Anemia?

Etiology	MCV	Reticulocyte Count	Ferritin	Additional Findings
Acute blood loss	Normal	Elevated	Normal	Decreasing hemoglobin and hematocrit
Chronic blood loss (iron deficiency)	Low	Low or Normal	Low	Elevated TIBC
Bone marrow failure	Normal/High	Low	Normal	Pancytopenia
Malignancy	Normal	Low	Normal/High	Increased CRP/ESR
Renal failure	Normal	Low	Normal	Decreased erythropoietin

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Laboratory Values in Metabolic Syndrome Warranting Nephrology Referral

For patients with metabolic syndrome, early detection of kidney impairment is vital to avoid progression to advanced kidney disease. Referral to a nephrologist should be considered when the estimated glomerular filtration rate (eGFR) drops below 30 mL/min/1.73 m², or when albuminuria exceeds 300 mg per gram of urinary creatinine.

An eGFR below this level corresponds to stage 4 chronic kidney disease, requiring specialized treatment to slow disease progression and prepare for possible dialysis or transplant. Significant albuminuria indicates glomerular damage and is strongly linked with increased cardiovascular and renal risks (National Kidney Foundation, 2023).

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First-Line Treatment for Generalized Anxiety Disorder

Selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) are considered the first-line pharmacologic treatments for generalized anxiety disorder (GAD). Examples include sertraline and escitalopram (SSRIs), and venlafaxine and duloxetine (SNRIs). These medications have demonstrated consistent effectiveness in reducing anxiety symptoms and are preferred due to their safety and suitability for long-term use.

In addition to medication, cognitive behavioral therapy (CBT) is recommended to enhance treatment outcomes, targeting both psychological and physical symptoms of anxiety.

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Types of Urinary Incontinence and Their Characteristics

Urinary incontinence can be classified into several types, each with unique mechanisms and clinical features that influence treatment decisions.

Type	Description
Stress incontinence	Leakage during activities increasing abdominal pressure (coughing, lifting)
Urge incontinence	Sudden urge to urinate followed by involuntary leakage
Mixed incontinence	Combination of stress and urge symptoms
Overflow incontinence	Continuous or intermittent leakage due to incomplete bladder emptying

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Which Patients Should Avoid Oxybutynin?

Oxybutynin, an anticholinergic drug used for overactive bladder, is contraindicated in certain conditions. It should be avoided in patients with myasthenia gravis because it can worsen muscle weakness. Those with untreated narrow-angle glaucoma, urinary retention related to benign prostatic hyperplasia, or inflammatory bowel diseases (such as ulcerative colitis or Crohn’s disease) should also not use oxybutynin due to its antimuscarinic side effects.

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Appropriate Medications for Treating Graves Disease

Graves disease is an autoimmune cause of hyperthyroidism, where thyroid-stimulating immunoglobulins activate the thyroid gland. The mainstay treatment in the U.S. is radioactive iodine ablation, which destroys overactive thyroid tissue and provides long-term disease control.

For initial symptom control or in patients who cannot undergo radioactive iodine therapy, antithyroid drugs like methimazole are used. Beta-blockers are also frequently prescribed to manage adrenergic symptoms, such as rapid heartbeat and tremors.

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Clinical Features of Addison’s Disease

Addison’s disease, or primary adrenal insufficiency, results from insufficient production of cortisol and aldosterone. Patients typically present with chronic symptoms such as fatigue, weight loss, low blood pressure, skin hyperpigmentation, and electrolyte abnormalities like hyponatremia and hyperkalemia.

During periods of stress (physical or emotional), affected individuals risk adrenal crisis—a medical emergency characterized by vomiting, profound hypotension, dehydration, and shock. Immediate treatment with glucocorticoids is critical for survival.

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Patient Education for Managing Type 2 Diabetes

Successful management of type 2 diabetes requires educating patients about lifestyle modifications, medication adherence, glucose monitoring, and complication prevention. Regular physical activity is essential as it improves insulin sensitivity and promotes glucose uptake by muscles; these effects can last up to 48 hours. Consequently, medication dosages may need adjustment to prevent hypoglycemia.

Nutritional guidance should focus on balanced diets, weight loss, and avoiding excess caloric intake. Patients should also learn to recognize hypoglycemia symptoms, follow sick-day management rules, and maintain routine medical follow-up. Exercise additionally helps delay progression from prediabetes to diabetes.

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Key Laboratory Test for Monitoring Kidney Function in Diabetes

The earliest and most sensitive laboratory indicator of diabetic kidney disease is microalbuminuria, defined as increased urinary albumin excretion exceeding 30 mg over 24 hours. This test often detects kidney damage before symptoms appear and predicts risks for renal failure and cardiovascular disease.

Testing methods include the albumin-to-creatinine ratio in a spot urine sample, timed urine collections, or 24-hour urine analysis. A diagnosis requires two abnormal results over a 3–6 month interval. Continuous monitoring evaluates treatment effectiveness and disease progression.

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Clinical Importance of the Philadelphia Chromosome

The Philadelphia chromosome is a genetic abnormality characteristic of chronic myelogenous leukemia (CML). It arises from a translocation between chromosomes 9 and 22, creating the BCR-ABL fusion gene. This gene encodes a constantly active tyrosine kinase that drives unchecked white blood cell proliferation.

CML was the first cancer linked to a specific chromosomal mutation. Identifying the Philadelphia chromosome enables targeted therapy with tyrosine kinase inhibitors, significantly improving survival and quality of life.

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Guidelines for Clinical Management of Type 1 and Type 2 Diabetes

Differentiating type 1 and type 2 diabetes is vital for treatment strategy. Type 1 diabetes requires lifelong insulin therapy due to absolute insulin deficiency. Type 2 diabetes management involves lifestyle changes, oral medications, and insulin as necessary.

In pregnancy, insulin remains the preferred treatment, although oral agents like glyburide and metformin are increasingly accepted for selected patients. C-peptide testing can help distinguish diabetes types when clinical signs overlap.

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Diagnosis, Lab Findings, and Treatment of Hypothyroidism

Hypothyroidism is diagnosed by elevated thyroid-stimulating hormone (TSH) levels combined with low free thyroxine (T4). Treatment consists of thyroid hormone replacement to normalize thyroid function and suppress excess TSH.

In thyroid cancer patients, TSH suppression is adjusted by risk category: intermediate and high-risk patients aim for TSH <0.3 mIU/L, whereas low-risk patients maintain levels between 0.3 and 2.0 mIU/L.

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Classes of Medications Used to Treat Depression

Antidepressant drugs are chosen based on symptom profile, comorbidities, and tolerability. The main classes include:

Class	Example	Typical Dose Range
SSRI	Sertraline	50–200 mg/day
SNRI	Venlafaxine	75–225 mg/day
Atypical	Bupropion	150–300 mg/day
TCA	Amitriptyline	25–150 mg/day
MAOI	Phenelzine	45–90 mg/day

SSRIs and SNRIs are generally first-line due to their effectiveness and favorable side-effect profiles.

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Which Type of Anemia is Associated with a Beefy Red Tongue?

Vitamin B12 deficiency anemia, a form of megaloblastic anemia, commonly presents with a smooth, bright red (beefy) tongue known as glossitis. Neurological symptoms such as peripheral neuropathy and cognitive changes may also occur. Early diagnosis and treatment are essential to prevent permanent neurological damage.

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References

American Diabetes Association. (2024). Standards of medical care in diabetes—2024. Diabetes Care, 47(Suppl. 1), S1–S350.

Jameson, J. L., Fauci, A. S., Kasper, D. L., Hauser, S. L., Longo, D. L., & Loscalzo, J. (2022). Harrison’s principles of internal medicine (21st ed.). McGraw-Hill.

Katzung, B. G., & Trevor, A. J. (2023). Basic and clinical pharmacology (15th ed.). McGraw-Hill.

Melmed, S., Polonsky, K. S., Larsen, P. R., & Kronenberg, H. M. (2020). Williams textbook of endocrinology (14th ed.). Elsevier.

D118 Unit 7 Study Guide

National Kidney Foundation. (2023). KDIGO clinical practice guideline for the evaluation and management of chronic kidney disease. Kidney International Supplements.

World Health Organization. (2022). Nutritional anaemias: Tools for effective prevention and control. WHO Press.

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