D446 Adult Health II - Set 5 - Part 3

Correct Answer: Ammonia elevation significant

Asterixis indicates hepatic encephalopathy from elevated ammonia and other neurotoxins, manifesting as characteristic flapping tremor with sustained wrist extension.
Option a is incorrect because hypoglycemia causes different neurological signs; asterixis specifically indicates hepatic encephalopathy from toxin accumulation.
Option c is incorrect because while electrolytes may be abnormal, asterixis specifically indicates hepatic encephalopathy, not general electrolyte disturbance.
Option d is incorrect because hypoxia causes different findings; asterixis is pathognomonic for metabolic encephalopathy, particularly hepatic origin.

Correct Answer: Hyperventilation compensatory occurring

Hypoxemia and mechanical receptor stimulation cause hyperventilation exceeding dead space increase, lowering CO2 despite ventilation-perfusion mismatch in pulmonary embolism.
Option a is incorrect because metabolism isn't decreased; hyperventilation from hypoxic drive and receptor stimulation exceeds dead space effects.
Option c is incorrect because perfusion is blocked by embolism; hypocapnia results from hyperventilation exceeding increased dead space ventilation.
Option d is incorrect because shunting isn't reversed; compensatory hyperventilation overrides dead space increase, causing net CO2 decrease observed.

Correct Answer: Regenerating mucosa islands

Pseudopolyps are islands of regenerating normal mucosa surrounded by ulcerated areas, appearing polypoid but representing healing, not true polyps.
Option a is incorrect because pseudopolyps aren't malignant; they're regenerating tissue islands that appear elevated compared to surrounding ulceration.
Option c is incorrect because they're not granulomas; pseudopolyps are normal mucosa surviving or regenerating among areas of ulceration.
Option d is incorrect because they're not adenomas; these are islands of normal regenerating tissue, not neoplastic polyps requiring removal.

Correct Answer: Insulin drives intracellular

Insulin therapy shifts phosphate into cells with glucose and potassium, potentially causing severe hypophosphatemia affecting cellular functions requiring supplementation.
Option a is incorrect because phosphate isn't significantly lost through vomiting; the drop occurs from insulin-mediated intracellular shift during treatment.
Option c is incorrect because acidosis actually shifts phosphate out of cells; treatment with insulin causes intracellular movement depleting serum levels.
Option d is incorrect because while some urinary loss occurs, the acute drop results from insulin driving phosphate intracellularly with glucose.

Correct Answer: White centered hemorrhages

Roth spots are retinal hemorrhages with white centers from septic emboli or fibrin, pathognomonic for bacterial endocarditis when present.
Option a is incorrect because cherry-red spots indicate different pathology; Roth spots have white centers in hemorrhages, not red coloration.
Option c is incorrect because cotton-wool spots indicate nerve fiber layer infarcts; Roth spots are hemorrhages with characteristic white centers.
Option d is incorrect because flame-shaped hemorrhages follow nerve fiber layers; Roth spots are round with distinctive white centers diagnostically.

Correct Answer: Cerebral perfusion prioritized

Compensatory mechanisms maintain cerebral and cardiac perfusion at expense of other organs; mental changes indicate compensation failing despite normal pressure.
Option a is incorrect because autoregulation initially maintains brain flow; mental changes indicate compensation limits reached despite blood pressure maintenance.
Option b is incorrect because glucose delivery is maintained initially; mental changes reflect perfusion limits despite compensatory blood pressure preservation.
Option c is incorrect because sympathetic response is protective; mental changes indicate compensation inadequate despite maintaining blood pressure initially.

Correct Answer: Increased intraabdominal pressure

Massive ascites increases intraabdominal pressure, forcing weakened umbilical tissues outward creating hernias at this natural weak point commonly.
Option a is incorrect because while muscle wasting occurs, umbilical hernias specifically result from pressure, not generalized weakness primarily.
Option c is incorrect because nutritional issues contribute but don't specifically cause umbilical hernias; increased pressure from ascites is causative.
Option d is incorrect because portal vein location doesn't relate to umbilical hernias; increased intraabdominal pressure from ascites causes protrusion.

Correct Answer: Oxygen extraction increased

Tissues extract more oxygen from blood compensating for decreased arterial oxygen content, lowering mixed venous saturation indicating increased extraction.
Option a is incorrect because increased cardiac output would improve mixed venous saturation; decreased SvO2 indicates increased tissue extraction.
Option c is incorrect because hemoglobin affinity changes don't primarily affect mixed venous saturation; increased extraction lowers venous oxygen content.
Option d is incorrect because shunting affects arterial oxygenation; low mixed venous saturation reflects increased tissue oxygen extraction compensation.

Correct Answer: Surface tension altered

Protein molecules reduce urine surface tension allowing bubble formation and persistence, creating characteristic foamy appearance distinguishing proteinuria from other causes.
Option a is incorrect because specific gravity increases don't create foam; protein's surface tension effects cause the characteristic foamy appearance.
Option c is incorrect because pH changes don't create foam; protein specifically alters surface tension properties enabling persistent bubble formation.
Option d is incorrect because glucose doesn't cause foaming; protein's unique effect on surface tension creates the characteristic appearance.

Correct Answer: Volume expansion effect

Water retention causes volume expansion suppressing aldosterone and increasing natriuresis, maintaining elevated urine sodium despite low serum levels paradoxically.
Option a is incorrect because tubules function normally; elevated urine sodium results from volume expansion effects, not tubular damage.
Option c is incorrect because while aldosterone is suppressed, this results from volume expansion, not primary suppression causing the finding.
Option d is incorrect because sodium isn't primarily wasted; natriuresis results from volume expansion attempting to reduce total body water.