NUR 507 midterm exam 4 Chamberlain University
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Free NUR 507 midterm exam 4 Chamberlain University Questions
1.
Which laboratory test is crucial for the diagnosis of sickle cell anemia?
- Serum ferritin level
- Hemoglobin A1C
- Complete blood count (CBC)
- Hemoglobin electrophoresis
Explanation
Explanation
Correct Answer: D) Hemoglobin electrophoresis
Hemoglobin electrophoresis is the definitive diagnostic test for sickle cell anemia. It separates different types of hemoglobin based on their electrical charge and migration pattern, allowing identification of hemoglobin S — the abnormal variant caused by a single amino acid substitution (valine for glutamic acid) in the beta-globin chain. In sickle cell anemia, the majority of hemoglobin will be identified as HbS, confirming the diagnosis.
Serum ferritin reflects iron stores and is used to diagnose iron deficiency or monitor iron overload, not sickle cell disease. Hemoglobin A1C measures average blood glucose over three months and is used in diabetes management. A complete blood count may reveal anemia and abnormal red cell indices, but it cannot identify the specific hemoglobin variant responsible for sickle cell disease.
Correct Answer: D) Hemoglobin electrophoresis
Hemoglobin electrophoresis is the definitive diagnostic test for sickle cell anemia. It separates different types of hemoglobin based on their electrical charge and migration pattern, allowing identification of hemoglobin S — the abnormal variant caused by a single amino acid substitution (valine for glutamic acid) in the beta-globin chain. In sickle cell anemia, the majority of hemoglobin will be identified as HbS, confirming the diagnosis.
Serum ferritin reflects iron stores and is used to diagnose iron deficiency or monitor iron overload, not sickle cell disease. Hemoglobin A1C measures average blood glucose over three months and is used in diabetes management. A complete blood count may reveal anemia and abnormal red cell indices, but it cannot identify the specific hemoglobin variant responsible for sickle cell disease.
2.
Emphysema can be categorized into different variations based on the distribution of lung damage. Which type of emphysema is characterized by damage primarily affecting the upper lobes of the lungs?
- Paraseptal emphysema
- Panacinar emphysema
- Irregular emphysema
- Centriacinar emphysema
Explanation
Explanation
Correct Answer: D) Centriacinar emphysema
Centriacinar emphysema, also known as centrilobular emphysema, is the most common type and is strongly associated with cigarette smoking. It predominantly affects the central portion of the acinus — specifically the respiratory bronchioles — and characteristically involves the upper lobes of the lungs where inhaled toxins tend to deposit more heavily due to regional ventilation patterns.
Paraseptal emphysema affects the distal acinus along the lung periphery and septa, and is associated with spontaneous pneumothorax in young adults. Panacinar emphysema involves the entire acinus uniformly and is classically associated with alpha-1 antitrypsin deficiency, predominantly affecting the lower lobes. Irregular emphysema is associated with scarring and has no consistent lobar distribution.
Correct Answer: D) Centriacinar emphysema
Centriacinar emphysema, also known as centrilobular emphysema, is the most common type and is strongly associated with cigarette smoking. It predominantly affects the central portion of the acinus — specifically the respiratory bronchioles — and characteristically involves the upper lobes of the lungs where inhaled toxins tend to deposit more heavily due to regional ventilation patterns.
Paraseptal emphysema affects the distal acinus along the lung periphery and septa, and is associated with spontaneous pneumothorax in young adults. Panacinar emphysema involves the entire acinus uniformly and is classically associated with alpha-1 antitrypsin deficiency, predominantly affecting the lower lobes. Irregular emphysema is associated with scarring and has no consistent lobar distribution.
3.
Which of the following patients is most at-risk for urge incontinence?
- A 40-year-old pregnant woman
- A 30-year-old male with a history of regular exercise
- A 60-year-old postmenopausal woman
- A 47-year-old male with benign prostatic hyperplasia
Explanation
Explanation
Correct Answer: C) A 60-year-old postmenopausal woman
Postmenopausal women are at the highest risk for urge incontinence due to the significant decline in estrogen levels that accompanies menopause. Estrogen plays a key role in maintaining the health and tone of the urethral and bladder mucosa. Its deficiency leads to atrophic changes in the urogenital tissues, increased bladder irritability, and detrusor muscle overactivity — all of which contribute to the sudden, strong urge to urinate that characterizes urge incontinence. Age further compounds these changes by reducing bladder capacity and increasing detrusor instability.
A pregnant woman is more prone to stress incontinence due to increased intra-abdominal pressure on the bladder rather than detrusor overactivity. A healthy, active 30-year-old male has no significant risk factors for urge incontinence. A male with BPH is more at risk for overflow incontinence or obstructive voiding symptoms rather than urge incontinence driven by detrusor overactivity.
Correct Answer: C) A 60-year-old postmenopausal woman
Postmenopausal women are at the highest risk for urge incontinence due to the significant decline in estrogen levels that accompanies menopause. Estrogen plays a key role in maintaining the health and tone of the urethral and bladder mucosa. Its deficiency leads to atrophic changes in the urogenital tissues, increased bladder irritability, and detrusor muscle overactivity — all of which contribute to the sudden, strong urge to urinate that characterizes urge incontinence. Age further compounds these changes by reducing bladder capacity and increasing detrusor instability.
A pregnant woman is more prone to stress incontinence due to increased intra-abdominal pressure on the bladder rather than detrusor overactivity. A healthy, active 30-year-old male has no significant risk factors for urge incontinence. A male with BPH is more at risk for overflow incontinence or obstructive voiding symptoms rather than urge incontinence driven by detrusor overactivity.
4.
What does the term azotemia denote in the context of kidney function?
- Impaired glucose metabolism
- Elevated levels of nitrogen-containing compounds in the blood
- Insufficient production of red blood cells
- Excessive sodium retention
Explanation
Explanation
Correct Answer: B) Elevated levels of nitrogen-containing compounds in the blood
Azotemia refers to the accumulation of nitrogenous waste products, primarily blood urea nitrogen (BUN) and creatinine, in the bloodstream due to impaired renal excretion. Healthy kidneys continuously filter and excrete these metabolic byproducts, but when renal function declines, as in acute kidney injury or CKD, these compounds accumulate to toxic levels. If azotemia progresses and becomes symptomatic, it is termed uremia, which can cause nausea, confusion, pericarditis, and multi-organ dysfunction.
Correct Answer: B) Elevated levels of nitrogen-containing compounds in the blood
Azotemia refers to the accumulation of nitrogenous waste products, primarily blood urea nitrogen (BUN) and creatinine, in the bloodstream due to impaired renal excretion. Healthy kidneys continuously filter and excrete these metabolic byproducts, but when renal function declines, as in acute kidney injury or CKD, these compounds accumulate to toxic levels. If azotemia progresses and becomes symptomatic, it is termed uremia, which can cause nausea, confusion, pericarditis, and multi-organ dysfunction.
5.
A 55-year-old patient presents with aortic regurgitation. Which of the following conditions is most likely to contribute to the development of this type of valvular disorder?
- Left ventricular hypertrophy
- Bicuspid aortic valve
- Mitral valve prolapse
- Atherosclerosis of the coronary arteries
Explanation
Explanation
Correct Answer: B) Bicuspid aortic valve
A bicuspid aortic valve — a congenital abnormality where the aortic valve has two leaflets instead of the normal three — is one of the most common causes of aortic regurgitation. The structural abnormality of the valve leaflets causes them to close incompletely, allowing blood to leak back from the aorta into the left ventricle during diastole. Over time, this volume overload leads to progressive left ventricular dilation and dysfunction.
Left ventricular hypertrophy is a consequence of increased pressure or volume load on the heart — it is a result of valvular or hypertensive disease rather than a cause of aortic regurgitation. Mitral valve prolapse affects the mitral valve and is associated with mitral regurgitation, not aortic regurgitation. Atherosclerosis of the coronary arteries leads to ischemic heart disease and does not directly cause aortic valve incompetence.
Correct Answer: B) Bicuspid aortic valve
A bicuspid aortic valve — a congenital abnormality where the aortic valve has two leaflets instead of the normal three — is one of the most common causes of aortic regurgitation. The structural abnormality of the valve leaflets causes them to close incompletely, allowing blood to leak back from the aorta into the left ventricle during diastole. Over time, this volume overload leads to progressive left ventricular dilation and dysfunction.
Left ventricular hypertrophy is a consequence of increased pressure or volume load on the heart — it is a result of valvular or hypertensive disease rather than a cause of aortic regurgitation. Mitral valve prolapse affects the mitral valve and is associated with mitral regurgitation, not aortic regurgitation. Atherosclerosis of the coronary arteries leads to ischemic heart disease and does not directly cause aortic valve incompetence.
6.
A 35-year-old woman presents with fatigue, pale skin, and brittle nails. Laboratory tests indicate low hemoglobin, hematocrit, and serum ferritin levels. What is the primary pathophysiological mechanism underlying her symptoms in iron deficiency anemia?
- Decreased iron absorption from the gastrointestinal (GI) tract
- Enhanced destruction of RBCs in the spleen
- Impaired production of erythropoietin by the kidneys
- Insufficient dietary intake of vitamin B-12
Explanation
Explanation
Correct Answer: A) Decreased iron absorption from the gastrointestinal (GI) tract
In iron deficiency anemia, the most common underlying pathophysiological mechanism is inadequate iron availability, which most frequently results from decreased absorption from the GI tract — due to conditions such as celiac disease, chronic use of proton pump inhibitors, or gastrointestinal blood loss depleting stores faster than absorption can replenish them. With insufficient iron, the body cannot synthesize adequate hemoglobin, leading to microcytic, hypochromic red blood cells and the classic symptoms of fatigue, pallor, and brittle nails seen in this patient. The low serum ferritin confirms depleted iron stores.
Enhanced destruction of RBCs in the spleen describes hemolytic anemia, a separate condition. Impaired erythropoietin production by the kidneys leads to anemia of chronic kidney disease, not iron deficiency anemia. Vitamin B-12 insufficiency causes megaloblastic macrocytic anemia, which presents with different laboratory findings and does not result in low ferritin levels.
Correct Answer: A) Decreased iron absorption from the gastrointestinal (GI) tract
In iron deficiency anemia, the most common underlying pathophysiological mechanism is inadequate iron availability, which most frequently results from decreased absorption from the GI tract — due to conditions such as celiac disease, chronic use of proton pump inhibitors, or gastrointestinal blood loss depleting stores faster than absorption can replenish them. With insufficient iron, the body cannot synthesize adequate hemoglobin, leading to microcytic, hypochromic red blood cells and the classic symptoms of fatigue, pallor, and brittle nails seen in this patient. The low serum ferritin confirms depleted iron stores.
Enhanced destruction of RBCs in the spleen describes hemolytic anemia, a separate condition. Impaired erythropoietin production by the kidneys leads to anemia of chronic kidney disease, not iron deficiency anemia. Vitamin B-12 insufficiency causes megaloblastic macrocytic anemia, which presents with different laboratory findings and does not result in low ferritin levels.
7.
Why does polycythemia often occur in individuals with Chronic Obstructive Pulmonary Disease (COPD)?
- Chronic hypoxemia leads to an increase in erythropoietin production
- Inflammation-mediated changes in bone marrow function result in polycythemia
- Increased oxygen delivery to tissues stimulates erythropoiesis
- Pulmonary hypertension stimulates red blood cell production in the lungs
Explanation
Explanation
Correct Answer: A) Chronic hypoxemia leads to an increase in erythropoietin production
In COPD, progressive airflow limitation and ventilation-perfusion mismatch result in chronic hypoxemia — persistently low oxygen levels in the blood. The kidneys detect this reduced oxygen tension and respond by increasing the production of erythropoietin, a hormone that stimulates the bone marrow to produce more red blood cells. This compensatory polycythemia attempts to improve oxygen delivery to tissues but can also increase blood viscosity and the risk of thrombosis.
Inflammation in COPD does not directly stimulate bone marrow to cause polycythemia in a clinically significant way. Oxygen delivery to tissues is actually decreased in COPD, not increased, making option C incorrect. Red blood cell production occurs in the bone marrow, not the lungs, so pulmonary hypertension does not directly stimulate erythropoiesis.
Correct Answer: A) Chronic hypoxemia leads to an increase in erythropoietin production
In COPD, progressive airflow limitation and ventilation-perfusion mismatch result in chronic hypoxemia — persistently low oxygen levels in the blood. The kidneys detect this reduced oxygen tension and respond by increasing the production of erythropoietin, a hormone that stimulates the bone marrow to produce more red blood cells. This compensatory polycythemia attempts to improve oxygen delivery to tissues but can also increase blood viscosity and the risk of thrombosis.
Inflammation in COPD does not directly stimulate bone marrow to cause polycythemia in a clinically significant way. Oxygen delivery to tissues is actually decreased in COPD, not increased, making option C incorrect. Red blood cell production occurs in the bone marrow, not the lungs, so pulmonary hypertension does not directly stimulate erythropoiesis.
8.
Which of the following is a risk factor for prostate cancer?
- Family history
- All choices are correct
- Ethnicity
- Obesity
Explanation
Explanation
Correct Answer: B) All choices are correct
Prostate cancer is associated with multiple well-established risk factors, all of which are represented among the answer choices. Family history is a significant risk factor, as men with a first-degree relative diagnosed with prostate cancer have a two to three times higher risk. Ethnicity plays a clear role, with African American men having the highest incidence and mortality rates compared to other ethnic groups. Obesity has been linked to more aggressive forms of prostate cancer and poorer outcomes, particularly due to hormonal and inflammatory mechanisms associated with excess adipose tissue.
Since family history, ethnicity, and obesity are all independently validated risk factors for prostate cancer, the most complete and accurate answer is that all choices are correct.
Correct Answer: B) All choices are correct
Prostate cancer is associated with multiple well-established risk factors, all of which are represented among the answer choices. Family history is a significant risk factor, as men with a first-degree relative diagnosed with prostate cancer have a two to three times higher risk. Ethnicity plays a clear role, with African American men having the highest incidence and mortality rates compared to other ethnic groups. Obesity has been linked to more aggressive forms of prostate cancer and poorer outcomes, particularly due to hormonal and inflammatory mechanisms associated with excess adipose tissue.
Since family history, ethnicity, and obesity are all independently validated risk factors for prostate cancer, the most complete and accurate answer is that all choices are correct.
9.
A patient is classified as Stage A for heart failure according to the American College of Cardiology (ACC)/American Heart Association (AHA) staging system. What intervention is most appropriate for managing Stage A heart failure?
- Implement lifestyle modifications and risk factor control
- Administer diuretics to relieve symptoms
- Perform coronary angiography for revascularization
- Initiate beta-blocker therapy
Explanation
Explanation
Correct Answer: A) Implement lifestyle modifications and risk factor control
Stage A heart failure represents the pre-heart failure stage — patients are at high risk due to conditions such as hypertension, diabetes, or obesity, but have no structural heart disease and no symptoms. The most appropriate intervention at this stage is aggressive management of risk factors through lifestyle modifications, including dietary changes, regular physical activity, smoking cessation, blood pressure control, and glycemic management, to prevent progression to structural heart disease.
Diuretics are used to relieve fluid overload symptoms in Stage C or D heart failure and are not appropriate at Stage A where no symptoms or structural changes exist. Coronary angiography for revascularization is reserved for patients with established coronary artery disease and specific indications. Beta-blocker therapy is initiated in patients with structural heart disease and reduced ejection fraction, typically Stage B or beyond.
Correct Answer: A) Implement lifestyle modifications and risk factor control
Stage A heart failure represents the pre-heart failure stage — patients are at high risk due to conditions such as hypertension, diabetes, or obesity, but have no structural heart disease and no symptoms. The most appropriate intervention at this stage is aggressive management of risk factors through lifestyle modifications, including dietary changes, regular physical activity, smoking cessation, blood pressure control, and glycemic management, to prevent progression to structural heart disease.
Diuretics are used to relieve fluid overload symptoms in Stage C or D heart failure and are not appropriate at Stage A where no symptoms or structural changes exist. Coronary angiography for revascularization is reserved for patients with established coronary artery disease and specific indications. Beta-blocker therapy is initiated in patients with structural heart disease and reduced ejection fraction, typically Stage B or beyond.
10.
What is the first-line bronchodilator medication used in the treatment of an acute asthma attack?
- Salmeterol
- Montelukast
- Ipratropium bromide
- Inhaled beta-agonist bronchodilator
Explanation
Explanation
Correct Answer: D) Inhaled beta-agonist bronchodilator
Short-acting inhaled beta-2 agonists, such as albuterol (salbutamol), are the first-line treatment for acute asthma attacks. They work by rapidly binding to beta-2 receptors in bronchial smooth muscle, causing bronchodilation and relieving airflow obstruction within minutes. Their rapid onset of action makes them the most effective rescue therapy during an acute exacerbation.
Salmeterol is a long-acting beta-agonist used for maintenance therapy and is not appropriate for acute rescue due to its slow onset. Montelukast is a leukotriene receptor antagonist used for long-term prophylactic management and has no role in treating acute bronchospasm. Ipratropium bromide is an anticholinergic bronchodilator that may be added as adjunct therapy in severe attacks but is not the first-line agent.
Correct Answer: D) Inhaled beta-agonist bronchodilator
Short-acting inhaled beta-2 agonists, such as albuterol (salbutamol), are the first-line treatment for acute asthma attacks. They work by rapidly binding to beta-2 receptors in bronchial smooth muscle, causing bronchodilation and relieving airflow obstruction within minutes. Their rapid onset of action makes them the most effective rescue therapy during an acute exacerbation.
Salmeterol is a long-acting beta-agonist used for maintenance therapy and is not appropriate for acute rescue due to its slow onset. Montelukast is a leukotriene receptor antagonist used for long-term prophylactic management and has no role in treating acute bronchospasm. Ipratropium bromide is an anticholinergic bronchodilator that may be added as adjunct therapy in severe attacks but is not the first-line agent.
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