NR-283 Pathophysiology - Set 4 - Part 2

Correct Answer: Retained water spreads across all body compartments

Excess antidiuretic hormone makes the tubules reabsorb water without sodium, so plasma is diluted. Most of that water moves into cells rather than pooling in the interstitium, which is why the client gains weight yet stays euvolemic. Option a is incorrect because urinary sodium loss does occur here, yet it is a consequence of volume expansion suppressing aldosterone rather than the reason the sodium concentration fell. Dilution by retained water is the primary event. Option b is incorrect because falling oncotic pressure drives fluid out of capillaries and shows up as pitting edema, often with periorbital puffiness. Assessment here found normal turgor and no swelling, so capillary fluid shift is absent. Option d is incorrect because mineralocorticoid excess retains sodium along with water and typically raises serum sodium slightly while dropping potassium. That picture comes with resistant hypertension, not with the profound hyponatremia recorded for this client.

Correct Answer: Antigen antibody complexes settle in the glomerular wall

Circulating complexes of streptococcal antigen and antibody lodge in the glomerular basement membrane, activate complement and draw neutrophils whose enzymes damage the capillary wall. Forming those complexes takes one to two weeks. Option a is incorrect because ascending bacterial invasion of renal tissue is pyelonephritis, announced by fever, chills and costovertebral tenderness. Urine cultures in this disorder are sterile, since the organism has already been cleared. Option c is incorrect because tubular scarring from a circulating toxin would blunt concentrating ability and produce dilute urine. The injury in this illness sits at the filter itself, which is why blood and protein appear. Option d is incorrect because antibody aimed directly at basement membrane in kidney and lung describes Goodpasture syndrome, which brings coughing up blood. No pulmonary bleeding accompanies the illness that follows a streptococcal sore throat.

Correct Answer: Give intravenous hydrocortisone without waiting for laboratory confirmation

Adrenal crisis is treated on suspicion because it kills within hours. Replacing the missing glucocorticoid restores vascular responsiveness, gluconeogenesis and potassium handling at once, and aggressive saline with dextrose follows to correct the volume and sugar deficits. Option b is incorrect because an oral mineralocorticoid cannot be absorbed by a vomiting client in shock, and waiting for the vomiting to stop wastes the narrow window in which replacement still works. Option c is incorrect because binding resins pull potassium out slowly over hours and treat only one downstream abnormality. The high potassium here is a symptom of absent aldosterone, so the deficiency itself must be corrected. Option d is incorrect because this client is profoundly volume depleted from salt wasting and vomiting, so withholding fluid deepens the shock. Fluid restriction suits dilutional hyponatremia from excess antidiuretic hormone, a completely different problem.

Correct Answer: Splanchnic vasoconstriction producing mucosal ischemia

Burn shock diverts blood away from the gut, so the mucosa cannot maintain its mucus and bicarbonate defense or repair itself. Shallow Curling erosions form and bleed painlessly within the first days. Option a is incorrect because vagal overdrive with acid hypersecretion describes the Cushing ulcer, which follows head injury and rising intracranial pressure. Burn injury damages the mucosa through poor perfusion, not through excess acid. Option b is incorrect because autoimmune attack on parietal cells develops slowly over years and ends in achlorhydria with vitamin B12 deficiency. Pernicious anemia, not acute bleeding, is what that process produces. Option d is incorrect because Helicobacter colonization causes chronic antral gastritis and peptic ulcers over long periods. A stress lesion appearing within hours of a major burn has no time to involve that organism.

Correct Answer: Retained phosphate lowers calcium, so parathyroid hormone strips bone

The failing kidney cannot excrete phosphate or activate vitamin D, so serum calcium falls twice over. Chronically low calcium drives the parathyroid glands to pull mineral out of bone, producing renal osteodystrophy. Option a is incorrect because active vitamin D is deficient, not plentiful, once the kidney loses its hydroxylating step. Abundant calcitriol would raise serum calcium and suppress the parathyroid glands, the opposite of these results. Option c is incorrect because the hormone that stimulates marrow governs red cell production and its loss produces anemia. Fatigue and pallor follow from that deficiency, but it leaves calcium, phosphate and parathyroid hormone untouched. Option d is incorrect because chronic acidosis does contribute to demineralization, yet it never suppresses the parathyroid glands. Their output here is high, which is the finding that identifies secondary overactivity driven by low calcium.

Correct Answer: Thyroid storm precipitated by the infection

Infection is a classic trigger that tips uncontrolled hyperthyroidism into decompensation. Hyperpyrexia, extreme tachycardia with atrial fibrillation and delirium together define thyrotoxic crisis, an emergency in which untreated mortality is high. Option a is incorrect because pneumonia alone rarely produces this degree of thermal and cardiac instability in a client whose thyroid is already overactive. The infection is the precipitant here, not the whole explanation. Option b is incorrect because low calcium announces itself with circumoral tingling, muscle twitching, carpopedal spasm and stridor. None of those appear, and tetany does not drive body temperature upward or trigger atrial fibrillation. Option c is incorrect because decompensated hypothyroidism moves the opposite direction, with hypothermia, bradycardia, hypoventilation and progressive obtundation. A febrile client racing along at a very high rate cannot be sliding into that state.

Correct Answer: Reduced release of erythropoietin from the kidney

Peritubular interstitial cells sense tissue hypoxia and release erythropoietin, which drives marrow red cell production. As functioning kidney tissue is lost that signal disappears, producing a normocytic normochromic anemia despite adequate iron. Option a is incorrect because calcitriol deficiency lowers intestinal calcium absorption and drives renal bone disease. Its consequences are hypocalcemia, secondary hyperparathyroidism and fractures, none of which shrink the circulating red cell mass. Option c is incorrect because failed acid and phosphate handling produces metabolic acidosis with Kussmaul breathing and a high phosphate level. Those derangements sit in the acid base and mineral columns, not the hematologic one. Option d is incorrect because renin loss would blunt the renin angiotensin cascade and lower blood pressure. Diseased kidneys actually oversecrete renin, which is why hypertension rather than anemia follows from that pathway.

Correct Answer: Severely decreased filtration approaching the need for dialysis

Filtration between fifteen and twenty nine milliliters per minute sustained beyond three months places a client in the severely decreased category, the point at which preparation for renal replacement therapy begins. Option a is incorrect because a filtration rate at or above ninety only counts as disease when albuminuria or another damage marker accompanies it. This client's rate sits far below that threshold. Option b is incorrect because age related decline runs about one milliliter per minute per year and rarely drops someone this low. Fatigue, nocturia and anemia signal genuine disease rather than ordinary senescence. Option d is incorrect because sudden injury unfolds over hours to days and often reverses once the cause is corrected. Six months of steady impairment meets the definition of the chronic, permanent form instead.

Correct Answer: Glucose is carried across muscle and fat membranes

Insulin facilitates glucose transport across the cell membranes of muscle, liver and adipose tissue, and it also drives potassium inward. Without that transport step the sugar stays outside the cell and accumulates in blood. Option b is incorrect because glycogenolysis raises blood sugar rather than lowering it, and insulin actively suppresses that pathway. Glucagon from the alpha cells is the hormone that orders stored glycogen broken apart. Option c is incorrect because lipolysis belongs to the fasting state, when insulin has fallen away. An anabolic hormone builds fat stores instead, so the release of free fatty acids marks insulin deficiency. Option d is incorrect because gluconeogenesis manufactures fresh glucose from amino acids and glycerol, a liver process that insulin restrains. Naming it here reverses the direction the hormone actually pushes blood sugar.

Correct Answer: Glomeruli recover filtration before tubules regain reabsorption

Filtration returns first while the damaged tubules still cannot reabsorb water or concentrate urine, and retained urea adds an osmotic pull. Large dilute volumes therefore appear before waste clearance actually improves, risking hypovolemia and low potassium. Option a is incorrect because surplus antidiuretic hormone inserts water channels and yields small volumes of concentrated urine with a diluted serum sodium. The picture described is the reverse, with copious pale output. Option b is incorrect because a fresh blockage would cut output sharply or make it swing between nothing and floods. Steady high volume flow with orthostatic dizziness argues against anything obstructing the drainage path. Option c is incorrect because irreversible scarring would keep waste levels climbing without any surge in volume. This client is showing the recovery pattern typical of tubular injury, in which function returns over days to weeks.

Correct Answer: Catecholamine release came first, then brain fuel deprivation

Falling glucose first triggers a sympathetic surge that produces tremor, sweating, palpitations and hunger. When the level drops further, the brain itself runs short of fuel and neuroglycopenic confusion and slurred speech follow. Option a is incorrect because ketones accumulate when glucose is high and insulin is absent, the reverse of this situation. Their build up brings nausea and deep breathing rather than tremor and clammy skin. Option b is incorrect because osmotic diuresis requires glucose above the renal threshold, which cannot be happening in a client whose sugar has fallen. Volume depletion also arrives over hours, not within minutes. Option d is incorrect because a sodium disorder does not begin with sweating, tremor and palpitations. Swollen brain cells from low sodium cause headache, nausea and seizures over a much slower course.

Correct Answer: Hypoventilation with carbon dioxide retention

Depressed respiratory drive in myxedema coma lets carbon dioxide accumulate and oxygen fall, and respiratory failure is the usual cause of death. Airway support outranks the hypothermia, the sodium and the enzyme abnormalities. Option a is incorrect because the dilutional hyponatremia of severe hypothyroidism is real and does contribute to obtundation, yet it develops gradually and corrects with treatment. Breathing failure kills faster than the sodium does. Option c is incorrect because pressure injury matters over days of immobility, not in the first minutes of resuscitation. Ranking a skin concern above gas exchange inverts the order that airway and breathing always take. Option d is incorrect because a raised muscle enzyme simply reflects impaired muscle metabolism and supports the diagnosis. It is a laboratory marker rather than a lethal process, and treating it changes nothing about oxygenation.

Correct Answer: Cancer of the right sided ascending colon

A bulky lesion in the wide right colon ulcerates and oozes slowly into liquid stool, so bleeding stays hidden. The result is iron deficiency anemia, and obstruction appears only very late. Option a is incorrect because hemorrhoidal bleeding is visible, bright red and painless, coating the stool or dripping after defecation. Attributing occult loss to them in an older man risks missing a tumor. Option b is incorrect because adult men have no physiologic route of blood loss, so diet is rarely the explanation for their iron depletion. A positive occult blood test already locates the source in the gut. Option c is incorrect because outpouchings usually stay silent or bleed briskly and visibly when a vessel erodes. Slow occult oozing with anemia is not their pattern, and cancer must be excluded first.

Correct Answer: The anterior pituitary is failing to signal

Negative feedback should drive thyroid stimulating hormone upward when thyroxine falls. Both hormones moving the same direction means the pituitary is not sending its tropic signal, which defines secondary, or central, hypothyroidism. Option b is incorrect because glandular destruction leaves the pituitary shouting at a dead thyroid, so thyroid stimulating hormone would be clearly elevated alongside the low thyroxine. Primary disease shows the two hormones moving opposite ways. Option c is incorrect because receptor blockade describes a target tissue problem, and the hallmark of that group is a high circulating hormone with deficiency symptoms. Here the hormone itself is low, so resistance does not explain it. Option d is incorrect because autonomous overproduction raises thyroxine and suppresses the tropic hormone, producing heat intolerance and weight loss. This client is cold and gaining weight, and her thyroxine level sits below the reference range.

Correct Answer: Biliary colic from cystic duct obstruction

Fat entering the duodenum releases cholecystokinin, and the gallbladder squeezes against a stone lodged in the cystic duct. The stretched organ refers pain along shared nerve segments to the right scapula. Option a is incorrect because irritated gastric mucosa produces burning epigastric soreness with nausea and belching, centered in the midline. It does not travel to the shoulder blade or arrive as a single severe wave. Option b is incorrect because inflamed outpouchings sit low on the left side and hurt there, with fever and a changed bowel habit. Fatty food is not the trigger, and the pain never crosses to the scapula. Option d is incorrect because acid rising into the esophagus produces sternal burning that eases when the client sits upright. Severe right sided pain reaching the back does not fit an esophageal source.

Correct Answer: Intrarenal injury from acute tubular necrosis

Both contrast and aminoglycosides concentrate inside proximal tubular cells and kill them. The sloughed cells form muddy brown granular casts, and the injured tubules can no longer conserve sodium, so urine sodium climbs. Option a is incorrect because a starved but intact kidney hoards sodium, keeping urine sodium under twenty and osmolality high. Fluid alone reverses that state, whereas this client will not respond to volume replacement. Option b is incorrect because pressure from a blocked ureter shows up as hydronephrosis on ultrasound with a bland urinary sediment. Casts cannot form downstream of the tubule, so their presence rules this out. Option c is incorrect because an allergic reaction in the interstitium follows drugs such as penicillins or proton pump inhibitors and brings fever, rash, eosinophils and white cell casts. Granular debris is not its signature.

Correct Answer: Hypoglycemia from too much circulating insulin

Cool, clammy, pale skin with tremor and tachycardia is the adrenergic signature of a falling glucose. It demands immediate treatment, because the brain can be injured within minutes of fuel loss. Option a is incorrect because that crisis gives warm dry flushed skin, deep breathing and a fruity odor. Skin that is cold and wet points the other direction entirely and calls for sugar, not insulin. Option c is incorrect because the hyperosmolar picture develops across days in an older adult and features lethargy with very dry mucous membranes. Diaphoresis and shakiness have no place in that presentation. Option d is incorrect because a morning surge of growth hormone and cortisol raises the sugar rather than lowering it. High readings on waking produce no tremor, sweating or racing pulse at all.

Correct Answer: The liver converted mobilized fatty acids into ketones

Without insulin, adipose tissue releases free fatty acids in bulk, and the liver converts them into acetoacetate, beta hydroxybutyrate and acetone. The body burns fat because carbohydrate cannot enter cells. Option b is incorrect because concentrating urine does not create ketoacids. Dehydration certainly accompanies this crisis and worsens it, yet the acid load originates in hepatic metabolism of fat, not in renal handling. Option c is incorrect because lactic acid comes from oxygen starved tissue, as in shock or heavy exertion. It is a separate acid entirely and would not give the breath its fruity acetone odor. Option d is incorrect because dietary fat does not deliver preformed ketones into the blood. Ketone bodies are manufactured in the liver during insulin deficiency or prolonged fasting, whatever the client happened to eat.

Correct Answer: The insulin making cells are destroyed and cannot regrow

In type one diabetes the beta cells have been destroyed by the immune system and cannot be restored, so replacement insulin is required for life. Diet and activity support control but cannot substitute. Option a is incorrect because weight reduction helps the resistant tissue seen in type two diabetes. A child whose islets were destroyed has no cells left to restart secretion, whatever the body weight becomes. Option b is incorrect because receptor sensitivity is not the problem here. Type one is a supply failure rather than a signaling failure, so improving how cells respond cannot help when no hormone arrives. Option d is incorrect because unrestrained hepatic glucose output is itself a consequence of missing insulin, not something meal timing fixes. Without the hormone, glycogenolysis and gluconeogenesis run on regardless of the schedule.

Correct Answer: Small bowel obstruction from postoperative adhesions

Adhesions are the leading cause of small bowel blockage, and a rapid onset with early profuse vomiting, cramping around the umbilicus and limited distension marks the small intestine as the site. Option a is incorrect because colonic blockage builds over days to weeks, with marked distension and early obstipation. Vomiting comes late or not at all, since the competent ileocecal valve holds contents back. Option c is incorrect because a paralyzed gut produces steady dull discomfort with quiet or silent bowel sounds and generalized swelling. Cramping waves that come and go signal peristalsis fighting a genuine barrier. Option d is incorrect because scarring at the stomach outlet brings up undigested food eaten hours before, never feculent material. Bile and bacterial breakdown products require obstruction well downstream of the pylorus.