Question 22
Advanced Pathophysiology. A 50-year-old man presents with polyuria and polydipsia. Labs show fasting glucose 90 mg/dL and hypercalcemia. PTH is suppressed. The NP bases the plan of care on the understanding that which process causes his hypercalcemia?
- Primary hyperparathyroidism
- PTH-independent calcium release due to malignancy producing PTH-related peptide
- Chronic renal insufficiency reducing phosphate excretion
- Vitamin D deficiency causing secondary hyperparathyroidism
Question 23
A 68-year-old woman presents with memory loss, disorientation, and difficulty performing familiar tasks. MRI reveals cortical atrophy. The NP bases the plan of care on the understanding that which process explains her condition?
- Accumulation of beta-amyloid plaques and neurofibrillary tangles leading to synaptic dysfunction (Alzheimer disease)
- Dopamine neuron loss in the substantia nigra causing motor and cognitive decline
- Autoimmune demyelination of the central nervous system
- Frontal lobe infarction from chronic cerebral ischemia
Question 24
A 45-year-old woman reports fatigue and craving ice. She has heavy menses. Labs: Hgb 8.9 g/dL, MCV 73 fL, ferritin 7 ng/mL, serum iron 22 mug/dL, TIBC 465 \mug/dL. The NP bases the plan of care on the understanding that which process causes her anemia?
- Ineffective DNA replication causing macrocytosis
- Depleted iron stores limiting heme synthesis and producing microcytosis (iron-deficiency anemia)
- Bone-marrow stem-cell failure reducing all cell lines
- Chronic renal insufficiency reducing erythropoietin production
Question 25
A 73-year-old man reports difficulty urinating and nocturia. Digital rectal exam reveals a smooth, enlarged prostate. The NP bases the plan of care on the understanding that which mechanism explains these findings?
- Prostatic inflammation from chronic bacterial infection
- Hormone-mediated prostatic stromal and epithelial hyperplasia causing urethral compression (benign prostatic hyperplasia)
- Metastatic infiltration of the pelvic bone causing referred pain
- Autoimmune destruction of the prostate glandular tissue
Question 26
A 29-year-old woman experiences severe unilateral throbbing headache preceded by shimmering visual changes. The NP bases the plan of care on the understanding that which pathophysiologic event initiates her pain?
- Excess cerebrospinal fluid production increasing intracranial pressure
- Dopaminergic neuron degeneration in the basal ganglia
- Cortical spreading depolarization triggering trigemino vascular activation and neurogenic inflammation
- Immune demyelination of the optic nerve leading to visual loss
Question 27
A 56-year-old woman reports fatigue, cold intolerance, and weight gain. Exam shows dry skin and delayed reflex relaxation. Labs: TSH 11.2 mu IU/mL free T4 $0.5 ng/dL. The NP bases the plan of care on the understanding that which process causes this disorder?
- Pituitary adenoma producing excess TSH
- Autoimmune (Hashimoto) destruction of thyroid tissue reducing T3/T_4 synthesis
- Chronic iodine excess suppressing thyroid hormone release
- Peripheral thyroid-hormone resistance in target tissues
Question 28
A 38-year-old woman develops a deep venous thrombosis (DVT) two weeks after a long flight. Her mother had an unprovoked DVT at age 40. Activated protein C (APC) resistance test is abnormal. The NP bases the plan of care on the understanding that which mechanism explains this tendency?
- Antithrombin deficiency causing excessive factor Xa activity
- Autoantibodies against platelets causing thrombocytopenia
- Mutation in factor V making it resistant to inactivation by activated protein C (Factor V Leiden)
- Deficiency of von Willebrand factor prolonging bleeding time
Question 29
A 60-year-old man presents with severe crushing chest pain radiating to the left arm and jaw. ECG shows ST elevation in V1–V4. The NP bases the plan of care on the understanding that which coronary artery is most likely occluded?
- Right coronary artery supplying the inferior wall
- Left anterior descending artery supplying the anterior wall of the left ventricle
- Left circumflex artery supplying the lateral wall
- Posterior descending artery supplying the posterior wall
Question 30
A 70-year-old woman presents with progressive shortness of breath and ankle swelling. Echocardiogram shows concentric left ventricular hypertrophy and normal ejection fraction. The NP bases the plan of care on the understanding that which mechanism explains her symptoms?
- Acute myocardial infarction causing systolic pump failure
- Chronic pressure overload from long-standing hypertension causing diastolic dysfunction (heart failure with preserved ejection fraction)
- Volume overload from acute renal failure causing pulmonary edema
- Viral myocarditis causing global ventricular dilation
Question 31
A 41-year-old woman presents with excessive thirst, frequent urination, and fatigue. Labs: fasting glucose 188 mg/dL, HbA}8.6%. The NP bases the plan of care on the understanding that which pathophysiologic process best explains her condition?
- Peripheral insulin resistance with impaired glucose uptake and increased hepatic glucose output (type 2 diabetes mellitus)
- Autoimmune destruction of pancreatic beta cells causing absolute insulin deficiency
- Pituitary failure to secrete ADH leading to water loss
- Excessive cortisol production causing secondary hyperglycemia
Question 32
A 25-year-old man presents with sudden onset of scrotal pain and swelling after physical activity. The NP bases the plan of care on the understanding that which pathophysiologic process explains his symptoms?
- Epididymal infection causing inflammatory swelling
- Twisting of the spermatic cord leading to ischemia and venous congestion (testicular torsion)
- Fluid accumulation within the tunica vaginalis
- Herniation of the bowel through the inguinal canal
Question 33
A 69-year-old man presents with cough producing blood-tinged sputum. He has smoked for 50 years. Imaging shows a central lung mass obstructing the right main bronchus. The NP bases the plan of care on the understanding that which process explains his disease?
- Chronic alveolar macrophage activation leading to fibrosis
- Malignant transformation of bronchial epithelial cells due to carcinogen exposure (squamous cell carcinoma of the lung)
- Inherited mutation in alpha-1 antitrypsin causing lung destruction
- Vasculitis of pulmonary capillaries causing alveolar hemorrhage
Question 34
Advanced Pathophysiology. A 9-year-old boy presents with recurrent joint and muscle bleeding after minor trauma. Family history is positive in maternal male relatives. Labs: platelets 300,000 \muL (150–400,000), PT 12 s (11–15), aPTT 78 s (25–35). The NP bases the plan of care on the understanding that which process explains his bleeding disorder?
- Vitamin K deficiency lowering activity of clotting factors
- Platelet adhesion defect with prolonged bleeding time
- Deficiency of an intrinsic-pathway factor reducing thrombin generation and prolonging aPTT
Question 35
A 70-year-old man presents with difficulty initiating movement and a mask-like facial expression. The NP bases the plan of care on the understanding that which neurotransmitter imbalance is present? Advanced Pathophysiology
- Increased dopamine and decreased acetylcholine
- Decreased dopamine and relative acetylcholine excess in the basal ganglia
- Decreased serotonin with norepinephrine excess
- Increased GABA with decreased glutamate
Question 36
A 62-year-old man with a long smoking history presents with chronic cough producing sputum for more than three months in two consecutive years. The NP bases the plan of care on the understanding that which process causes his symptoms?
- Reversible bronchoconstriction
- Chronic inflammation and hypertrophy of mucus-secreting glands in bronchi leading to airway obstruction (chronic bronchitis)
- Fibrosis of alveolar septa reducing compliance
- Destruction of elastic tissue increasing residual volume
Question 37
A 58-year-old woman presents with fatigue, weight loss, and cold intolerance after thyroid surgery. Labs: TSH elevated, free $T_4$ low. The NP bases the plan of care on the understanding that which mechanism explains her disorder?
- Pituitary TSH suppression
- Iatrogenic loss of thyroid tissue leading to primary hypothyroidism
- Autoantibody stimulation of thyroid hormone production
- Thyroid hormone resistance at target tissues
Question 38
A 46-year-old woman presents with diarrhea, flushing, and wheezing. Labs show elevated urinary 5-HIAA. The NP bases the plan of care on the understanding that which process explains these findings?
- Autoimmune enteropathy causing malabsorption
- Serotonin-secreting neuroendocrine tumor of the small intestine (carcinoid syndrome)
- Gastrin-secreting tumor causing peptic ulcer
- Pancreatic beta-cell hyperplasia producing insulin
Question 39
A 60-year-old man presents with severe epigastric pain radiating to the back. Serum amylase and lipase are markedly elevated. The NP bases the plan of care on the understanding that which mechanism explains these findings?
- Obstruction of the bile duct with infection
- Chronic alcohol intake causing hepatocellular failure
- Premature activation of pancreatic enzymes leading to autodigestion of the pancreas (acute pancreatitis)
- Gallbladder inflammation with gallstone formation
Question 40
A 70-year-old man with chronic cough, weight loss, and right-arm weakness has hypercalcemia. Labs: Ca 12.0 mg/dL (8.5–10.5). The NP bases the plan of care on the understanding that which process explains his hypercalcemia?
- Vitamin D deficiency increasing PTH. Advanced Pathophysiology
- Defective osteoblast function
- Cytokine-mediated bone resorption from infection
- Tumor secretion of PTH-related peptide causing bone demineralization (squamous-cell carcinoma of lung)
Question 41
A 74-year-old woman has glare and blurry night vision. Slit-lamp exam reveals lens opacities; intraocular pressure is normal. The NP bases the plan of care on the understanding that which mechanism causes this finding?
- Acute trabecular blockage causing ischemia
- Inflammatory uveitis with exudate
- Retinal venous occlusion with edema
- Age-related protein denaturation and aggregation within the lens reducing light transmission (cataract)
Question 42
A 66-year-old woman presents with nephrolithiasis and diffuse bone pain. Labs: $Ca^{2+}$ 11.6 mg/dL (8.5–10.5), phosphate 2.2 mg/dL (2.5–4.5), PTH elevated (15–65 pg/mL). The NP bases the plan of care on the understanding that which pathophysiologic process best explains these findings?
- Persistent parathyroid hormone excess increasing bone resorption and phosphate excretion
- Excess calcitonin causing renal calcium loss
- Vitamin D deficiency decreasing intestinal calcium absorption
- Reduced osteoclast activity limiting calcium release
Question 43
A 44-year-old woman presents with muscle weakness, bruising, and hypertension. Exam reveals supraclavicular fat pads and wide striae. Labs: cortisol 38 $\mu$g/dL (5–25), ACTH 92 pg/mL (10–60). The NP bases the plan of care on the understanding that which of these is the underlying cause?
- Adrenal cortical failure
- Ectopic ADH release
- Pituitary overproduction of ACTH causing adrenal hyperplasia and excess cortisol (Cushing disease)
- Autoimmune adrenal destruction
Question 44
A 36-year-old woman presents with fatigue, palpitations, and weight loss. Exam shows tremor, tachycardia, and a diffuse goiter. Labs: TSH suppressed, free $T_4$ elevated. The NP bases the plan of care on the understanding that which mechanism explains her condition?
- Pituitary adenoma secreting TSH
- Thyroid inflammation causing hormone leakage
- Autoantibody stimulation of the TSH receptor causing excess thyroid hormone synthesis (Graves disease)
- Excess iodine intake stimulating thyroid hormone production
Question 45
A 3-month-old infant frequently rubs his eyes and is sensitive to light. Exam shows enlarged corneas and increases intraocular pressure. The NP bases the plan of care on the understanding that congenital glaucoma is:
- Usually resolves spontaneously with medication
- Results from excess vitreous production
- Caused by abnormal development of aqueous-outflow channels and treated surgically
- Managed primarily with corticosteroids
Question 46
A 24-year-old man reports episodic palpitations, sweating, and headaches. BP is 182/108 mm Hg. Labs show elevated plasma catecholamines. The NP bases the plan of care on the understanding that which process explains these findings?
- Catecholamine-secreting tumor of the adrenal medulla (pheochromocytoma)
- Primary hyperaldosteronism causing sodium retention
- Chronic cortisol excess leading to secondary hypertension
- Decreased sympathetic nervous system activity
Question 47
A 62-year-old man with long-standing diabetes reports numb feet and gait imbalance. The NP bases the plan of care on the understanding that which mechanism causes his neuropathy? Advanced Pathophysiology
- Immune demyelination after infection
- Antibody-mediated acetylcholine-receptor blockade
- Chronic hyperglycemia causing ischemic and oxidative injury to distal sensory nerves (distal symmetric polyneuropathy)
- Sodium-channel mutation impairing conduction
Question 48
A 42-year-old woman presents with recurrent episodes of palpitations and sweating. ECG shows supraventricular tachycardia (SVT). The NP bases the plan of care on the understanding that which mechanism explains her arrhythmia?
- Myocardial infarction with conduction block
- Reentry circuit within the atrioventricular node causing paroxysmal tachycardia
- Increased vagal tone slowing sinus node activity
- Electrolyte imbalance reducing excitability
Question 49
A 52-year-old woman presents with chronic watery diarrhea. Colonoscopy reveals loss of mucosal villi in the small intestine. The NP bases the plan of care on the understanding that which mechanism explains her disease?
- Lactase enzyme deficiency
- Autoimmune response to gluten causing villous atrophy and malabsorption (celiac disease)
- Bacterial toxin-mediated injury
- Hypermotility from irritable bowel syndrome
Question 50
A 17-year-old girl reports facial rash that worsens with sun exposure, joint pain, and fatigue. Labs show positive ANA and anti-dsDNA antibodies. The NP bases the plan of care on the understanding that which process explains her disease?
- Type I hypersensitivity causing mast cell activation
- T-cell destruction of skin keratinocytes
- Immune complex deposition in tissues causing inflammation and organ injury (systemic lupus erythematosus)
- Cytotoxic antibody-mediated cell lysis
