D446 Adult Health II - Set 4 - Part 2

Correct Answer: Encephalopathy worsening significantly

TIPS bypasses liver detoxification, allowing ammonia and toxins direct systemic access, frequently worsening or precipitating hepatic encephalopathy requiring management.
Option a is incorrect because TIPS reduces variceal bleeding risk by decompressing portal system; bleeding isn't the main concern post-procedure.
Option c is incorrect because while infection is possible, the predictable complication is encephalopathy from bypassing liver's detoxification function.
Option d is incorrect because maintaining shunt patency is important, but encephalopathy from toxin bypass is the immediate clinical concern.

Correct Answer: Cardiovascular collapse risk

Thyroid hormone increases metabolism and cortisol demand; giving it before cortisol replacement in adrenal insufficiency can precipitate cardiovascular collapse.
Option a is incorrect because drug interaction isn't the concern; the issue is physiological need for cortisol before increasing metabolic rate.
Option b is incorrect because adrenals won't recover in Addison's disease; cortisol is needed before thyroid hormone to prevent crisis.
Option d is incorrect because absorption isn't the issue; thyroid hormone without adequate cortisol causes hemodynamic instability requiring sequenced replacement.

Correct Answer: Hypoxic vasoconstriction occurring

Chronic hypoxia causes pulmonary vasoconstriction increasing right ventricular afterload, leading to hypertrophy then failure, defining cor pulmonale's development mechanism.
Option b is incorrect because cor pulmonale is right heart failure from lung disease, not left heart failure causing right-sided problems.
Option c is incorrect because the mechanism is increased afterload from pulmonary hypertension, not primary volume overload causing failure.
Option d is incorrect because valves aren't primarily damaged; increased afterload from hypoxic pulmonary vasoconstriction causes right ventricular failure.

Correct Answer: Hemoglobin breakdown overwhelming

Massive red cell destruction releases hemoglobin faster than liver can conjugate resulting bilirubin, causing unconjugated hyperbilirubinemia distinguishing hemolysis from obstruction.
Option a is incorrect because liver function is normal in hemolytic anemia; it's overwhelmed by excessive hemoglobin breakdown, not dysfunctional.
Option c is incorrect because bile obstruction causes conjugated hyperbilirubinemia; hemolysis causes unconjugated elevation from overwhelming hepatic conjugation capacity.
Option d is incorrect because the mechanism is RBC destruction overwhelming conjugation capacity, not medication effects on bilirubin metabolism.

Correct Answer: Conduction velocity slows

Heat further slows nerve conduction in demyelinated fibers already conducting marginally, temporarily worsening symptoms until cooling restores baseline function.
Option a is incorrect because heat doesn't cause new inflammation; it temporarily impairs conduction in already damaged demyelinated nerve fibers.
Option c is incorrect because while spasticity may worsen, the mechanism is slowed conduction in damaged nerves, not primary muscle changes.
Option d is incorrect because Uhthoff's phenomenon is immediate and reversible with cooling, not progressive fatigue accumulation from heat exposure.

Correct Answer: Gallbladder inflammation contact

Murphy's sign occurs when inflamed gallbladder contacts examiner's hand during inspiration, causing sudden inspiratory arrest from pain, specifically indicating cholecystitis.
Option a is incorrect because general peritoneal irritation causes diffuse guarding; Murphy's sign specifically indicates gallbladder inflammation on palpation contact.
Option c is incorrect because biliary obstruction causes jaundice and colicky pain; Murphy's sign indicates gallbladder inflammation, not duct obstruction.
Option d is incorrect because hepatic tenderness is different; Murphy's sign specifically identifies inflamed gallbladder contacting palpating hand during breathing.

Correct Answer: Central adaptation occurred

Chronic hypercapnia causes central chemoreceptors to reset, losing CO2 sensitivity; breathing depends on peripheral chemoreceptor response to hypoxia instead.
Option a is incorrect because chemoreceptors aren't damaged; central receptors adapt to chronic CO2 elevation, shifting control to oxygen sensing.
Option c is incorrect because the mechanism is physiological adaptation to chronic hypercapnia, not medication effects on respiratory control centers.
Option d is incorrect because anxiety doesn't explain the physiological shift from hypercapnic to hypoxic drive in chronic CO2 retainers.

Correct Answer: Concentration effect achieved

Fluid restriction prevents further dilution while ongoing insensible losses gradually concentrate serum sodium despite continued inappropriate ADH secretion.
Option a is incorrect because sodium isn't produced; fluid restriction allows existing sodium to concentrate as water is lost insensibly.
Option b is incorrect because ADH prevents water excretion regardless of restriction; improvement comes from preventing further dilution while losing water insensibly.
Option d is incorrect because fluid restriction doesn't stop inappropriate ADH secretion; it prevents further dilution while natural losses concentrate sodium.

Correct Answer: Supply-demand mismatch occurring

Ventricular hypertrophy from aortic stenosis increases oxygen demand while reduced coronary perfusion pressure creates ischemia despite patent coronary arteries.
Option a is incorrect because endocarditis causes different symptoms; angina in aortic stenosis results from myocardial oxygen imbalance, not infection.
Option c is incorrect because dissection causes tearing pain; aortic stenosis causes angina from ventricular hypertrophy exceeding oxygen supply capacity.
Option d is incorrect because pericarditis causes positional sharp pain; aortic stenosis angina results from oxygen supply-demand mismatch in hypertrophied ventricle.

Correct Answer: Peripheral conversion blocked

PTU uniquely blocks peripheral T4 to T3 conversion besides inhibiting synthesis, providing faster symptom control in life-threatening thyroid storm.
Option a is incorrect because both drugs have similar onset for synthesis inhibition; PTU's advantage is additional peripheral conversion blockade.
Option c is incorrect because PTU actually has more side effects; it's chosen for peripheral conversion inhibition, not safety profile.
Option d is incorrect because drug cost isn't the consideration in emergencies; PTU's dual mechanism makes it preferred for thyroid storm.

Correct Answer: Joint destruction occurring

Charcot foot involves neuropathic joint destruction with bone fragmentation and deformity from repeated trauma in insensate feet, not infection primarily.
Option a is incorrect because Charcot foot is typically painless due to neuropathy; severe pain would suggest infection or other pathology.
Option c is incorrect because Charcot foot is non-infectious joint destruction; fever indicates infection, not the neuropathic arthropathy of Charcot.
Option d is incorrect because antibiotics don't help Charcot foot since it's neuropathic joint destruction, not infection requiring antimicrobial therapy.

Correct Answer: Right ventricle failing

Acute right ventricular failure from sudden afterload increase causes blood backing into systemic veins, elevating jugular venous pressure despite low output.
Option a is incorrect because PE causes right heart strain; left heart receives inadequate preload, not failure causing venous congestion.
Option c is incorrect because volume status is normal; JVD results from right ventricular failure unable to pump against increased afterload.
Option d is incorrect because while TR may develop, the primary mechanism is right ventricular failure from acute afterload increase causing backup.

Correct Answer: Pleuritic chest pain

Serositis causes inflammation of serous membranes like pleura and pericardium, producing characteristic sharp pain worsening with breathing or position changes.
Option a is incorrect because joint symptoms indicate arthritis; serositis specifically affects serous membrane linings causing pleuritic or pericardial pain.
Option c is incorrect because skin manifestations are separate from serositis, which specifically involves serous membrane inflammation causing characteristic pain.
Option d is incorrect because kidney involvement indicates nephritis; serositis specifically affects pleural and pericardial membranes causing positional chest pain.

Correct Answer: Insulin drives intracellular

Insulin therapy shifts potassium into cells with glucose, rapidly dropping serum levels despite total body depletion masked by dehydration initially.
Option a is incorrect because HHS typically has less vomiting than DKA; potassium drops from insulin effect, not gastrointestinal losses primarily.
Option c is incorrect because while osmotic diuresis causes losses, the acute drop during treatment results from insulin-mediated cellular uptake.
Option d is incorrect because HHS lacks significant acidosis; potassium shifts result from insulin therapy, not acid-base changes like DKA.

Correct Answer: Respiratory acidosis worsening

High oxygen suppresses hypoxic drive in CO2 retainers, reducing ventilation and worsening hypercapnia, causing respiratory acidosis with mental status changes.
Option a is incorrect because metabolic acidosis doesn't result from oxygen therapy; the problem is respiratory acidosis from suppressed ventilation.
Option c is incorrect because oxygen doesn't cause metabolic alkalosis; it suppresses breathing in COPD causing respiratory acidosis instead.
Option d is incorrect because suppressed breathing causes CO2 retention and respiratory acidosis, not alkalosis from hyperventilation which doesn't occur.

Correct Answer: Tubular function returning

Recovering tubules cannot yet concentrate urine effectively, producing large volumes of dilute urine until full tubular function gradually returns completely.
Option a is incorrect because osmotic diuresis requires osmotic agents; recovery phase polyuria results from tubular concentration inability, not osmotic effects.
Option c is incorrect because ATN isn't obstructive; polyuria during recovery reflects improving but still impaired tubular concentration ability initially.
Option d is incorrect because infection isn't ATN's cause; polyuria indicates recovering tubular function unable to concentrate urine initially after injury.

Correct Answer: Tumor manipulation direct

Direct handling of pheochromocytoma causes massive catecholamine release from tumor cells, triggering severe hypertension requiring immediate alpha-blockade management.
Option a is incorrect because while anesthesia can trigger release, direct tumor manipulation is the most common cause of intraoperative crisis.
Option c is incorrect because position changes rarely trigger significant catecholamine release compared to direct tumor handling during surgery.
Option d is incorrect because while abdominal pressure might contribute, direct tumor manipulation is the primary trigger for catecholamine surge.

Correct Answer: Tubular obstruction forming

Myoglobin precipitates in acidic tubular fluid forming casts that obstruct tubules, combined with vasoconstriction and direct toxicity causing acute kidney injury.
Option a is incorrect because while myoglobin has some direct toxicity, the primary mechanism is tubular obstruction from myoglobin cast formation.
Option c is incorrect because rhabdomyolysis causes direct mechanical and toxic injury, not immune-mediated kidney damage requiring different treatment.
Option d is incorrect because while vasoconstriction contributes, tubular obstruction from myoglobin casts is the predominant mechanism causing kidney injury.

Correct Answer: Muscle rigidity present

Muscle rigidity indicates irreversible ischemic muscle necrosis; earlier findings like pain and pulselessness may be reversible with prompt intervention.
Option a is incorrect because severe pain indicates viable tissue; muscle rigidity suggests irreversible necrosis has already occurred requiring amputation.
Option c is incorrect because skin mottling may be reversible with revascularization; muscle rigidity indicates irreversible ischemic damage has occurred.
Option d is incorrect because pulse absence indicates arterial occlusion but tissue may be salvageable; rigidity indicates irreversible muscle death.

Correct Answer: Respiratory muscle fatigue

Initial hyperventilation causes alkalosis, but respiratory muscle exhaustion eventually reduces ventilation, causing CO2 retention and dangerous respiratory acidosis.
Option a is incorrect because medications treat bronchospasm; acidosis indicates respiratory muscle fatigue unable to maintain hyperventilation compensating for obstruction.
Option c is incorrect because anxiety resolution would improve, not worsen, blood gases; acidosis indicates failing respiratory effort from exhaustion.
Option d is incorrect because infection doesn't directly cause the pH shift; respiratory muscle fatigue failing to maintain ventilation causes acidosis.