NR-283 Pathophysiology - Set 3 - Part 1

Correct Answer: The late phase response driven by eosinophils

Four to eight hours after exposure, chemotactic mediators pull eosinophils and neutrophils into the airway wall. Their products damage epithelium and sustain swelling, which is why this phase answers to steroids rather than bronchodilators. Option a is incorrect because rebound narrowing is not a recognized consequence of a single rescue dose, and the timing here matches a well described biphasic reaction. Blaming the inhaler would delay the steroid this client needs. Option b is incorrect because a new encounter would set off another immediate mast cell reaction within minutes, and that early burst responds promptly to a bronchodilator. Nothing in the history describes a second trigger. Option d is incorrect because structural rebuilding of the airway takes months to years of repeated inflammation and produces fixed obstruction. It cannot appear and disappear over the course of a single day.

Correct Answer: The ventricles quiver without ejecting any blood

Disorganized re-entrant wavelets keep the ventricular muscle trembling rather than contracting as a unit. Nothing is ejected, so there is no cardiac output, no pulse and no blood pressure until defibrillation restores order. Option b is incorrect because a very fast organized rhythm still shows wide regular complexes on the screen. This tracing has no recognizable complexes at all, which places it beyond simple tachycardia. Option c is incorrect because blocked conduction leaves visible P waves and an escape rhythm running slowly underneath. Blocks produce bradycardia and syncope, whereas the pattern described carries no organized activity to block. Option d is incorrect because a silent heart traces a flat line, and that rhythm cannot be shocked. Wild disorganized deflections mean electrical activity is present, merely useless for moving blood forward.

Correct Answer: The alveolar capillary membrane has thickened with collagen

Inhaled silica drives alveolitis, fibroblast proliferation and collagen deposition in the interstitium. The thickened membrane slows oxygen transfer and stiffens the lung, giving hypoxemia that is worst on exertion with a low carbon dioxide. Option a is incorrect because hypertrophied airway muscle narrows the passages and produces wheeze with a prolonged expiratory phase. This client has fine inspiratory crackles and no airflow obstruction at all. Option b is incorrect because more mucus producing cells generate a chronic wet cough with copious sputum, the hallmark of chronic bronchitis. Dust induced scarring gives a dry cough instead. Option d is incorrect because fluid between the pleural layers restricts expansion mechanically and blocks sound, so breath sounds fade rather than crackle. The lung tissue itself would remain structurally intact.

Correct Answer: Heart rate rises to defend cardiac output

Cardiac output is heart rate multiplied by stroke volume, so a falling stroke volume is offset by a faster rate. Tachycardia is therefore the earliest vital sign change in hemorrhage, appearing well before pressure drops. Option b is incorrect because afterload describes the resistance the ventricle pushes against, not a compensation for lost volume. Vasoconstriction does occur in hemorrhage, but it raises resistance rather than producing the faster pulse described here. Option c is incorrect because contractility is force generated independently of stretch, and a drop in it would lower output further instead of protecting it. Falling contractility explains ischemic pump failure, not this compensatory response. Option d is incorrect because venous return is shrinking, not growing, once circulating volume leaves the vascular space. Preload falls in hemorrhage, which is precisely why stroke volume dropped in the first place.

Correct Answer: Caseous necrosis at the center of granulomas

Sensitized T cells activate macrophages that become epithelioid and giant cells and wall the organisms inside a tubercle. The soft cheesy center of that tubercle is called caseous necrosis, the pathologic signature of this infection. Option a is incorrect because liquefactive necrosis melts tissue into pus and is typical of bacterial abscesses and brain infarction. Tuberculous tubercles stay firm and cheesy until late cavity formation occurs. Option b is incorrect because coagulative necrosis preserves tissue outline after blood supply is cut off, as in myocardial or renal infarction. No vessel was occluded here, and the lesion is infectious. Option c is incorrect because fibrinoid change deposits protein in vessel walls during immune complex disease such as vasculitis or lupus, a process unrelated to walling off an inhaled organism in lung tissue.

Correct Answer: A scratchy rub over the sternal border

Roughened pericardial layers grating over each other create a friction rub, the physical hallmark of pericarditis. It is loudest with the client sitting forward and persists when the breath is held. Option b is incorrect because that murmur belongs to aortic stenosis and travels up the neck vessels. Stenotic turbulence has no link to positional chest pain following a viral illness. Option c is incorrect because a click signals mitral valve prolapse, where redundant leaflets billow into the atrium during systole. Prolapse is usually benign and does not produce fever or pleuritic pain. Option d is incorrect because a machinery sound points to a patent ductus arteriosus, a congenital shunt between the aorta and pulmonary artery. Nothing in an adult with pleuritic pain suggests that lesion.

Correct Answer: A thickened left ventricular wall

A stenotic valve forces the ventricle behind it to generate very high pressure with every beat. Sarcomeres are added in parallel, so the wall thickens concentrically while the cavity stays small. Option a is incorrect because the atrium is upstream of the mitral valve, not the aortic one. Atrial dilation is what mitral stenosis produces once left atrial pressure climbs behind the obstructed inlet. Option b is incorrect because right ventricular enlargement belongs to pulmonary hypertension, lung disease or pulmonic lesions. Aortic narrowing loads the left side of the heart, and only much later does the right chamber suffer. Option d is incorrect because a big, thin chamber follows volume overload from a leaking valve, where extra blood returns each cycle. Pressure work builds muscle; volume work stretches it, and these findings differ.

Correct Answer: Recumbent reabsorption of daytime edema flooding the thorax

Lying down shifts blood from the legs into the chest and slowly reabsorbs interstitial fluid collected during the day. Pulmonary venous pressure climbs over a couple of hours until the client wakes gasping. Option a is incorrect because asthma driven wheeze responds to bronchodilators and follows an allergic or irritant trigger. Cardiac wheeze here is a byproduct of peribronchial edema, and the primary problem remains elevated filling pressure. Option b is incorrect because apneic desaturation produces repeated brief arousals with snoring across the whole night. The described episode is a single dramatic awakening relieved by upright posture, which fits fluid redistribution. Option c is incorrect because slowed atrioventricular conduction shows up as bradycardia, dizziness or dropped beats on a monitor. Breathlessness cured by sitting upright has nothing to do with the speed of impulse transmission.

Correct Answer: The first has lung failure, the second pump failure

Type one failure is an oxygenation problem in the lung itself, with carbon dioxide normal or low. Type two is ventilation failure of the pump, and the rising carbon dioxide is what defines it. Option a is incorrect because the labels are reversed. Stiff lungs that cannot move oxygen across into blood while blowing off carbon dioxide describe lung failure, and the client retaining acid gas is the one whose pump has quit. Option b is incorrect because grouping them together ignores the one laboratory value that separates the two types. Both clients are short of oxygen, yet only one has lost the ability to clear carbon dioxide. Option d is incorrect because a low carbon dioxide level proves the first client is moving plenty of air. Calling that ventilation failure contradicts the gas result sitting in front of the nurse.

Correct Answer: Constriction and remodeling of pulmonary arterioles

Alveolar hypoxia makes pulmonary arterioles constrict, unlike systemic vessels. When the hypoxia is global and unrelenting, the whole bed narrows and remodels, so pulmonary vascular resistance and pressure stay permanently elevated. Option b is incorrect because widening these vessels would lower resistance and drop the pressure. Systemic arterioles dilate when oxygen falls, and the pulmonary bed is famous for doing exactly the opposite. Option c is incorrect because a thicker gas exchange barrier slows diffusion and worsens oxygenation without raising arterial pressure inside the lung circuit. Resistance is set by the caliber of the small vessels. Option d is incorrect because back pressure from the left heart does raise pulmonary pressures, but that mechanism belongs to mitral valve disease and left ventricular failure. This client's problem starts in the lungs.

Correct Answer: Pneumonia presenting without the classic febrile response

Older adults often mount a blunted fever response, so a change in mental status with tachypnea may be the only clue to pneumonia. Tachypnea is usually the earliest objective abnormality recorded. Option a is incorrect because dementia develops slowly over months and does not raise the respiratory rate. An abrupt change in attention across a single day signals an acute physiologic insult instead. Option b is incorrect because volume depletion would show dry mucous membranes, poor skin turgor, falling blood pressure and concentrated urine, and it does not by itself drive breathing to this rate. Option c is incorrect because a brief ischemic event produces focal deficits such as weakness, facial droop or speech loss that resolve quickly. Global confusion with rapid breathing points toward infection somewhere in the body.

Correct Answer: Plasma flooding alveoli and mixing with air

Pulmonary capillary pressure has overwhelmed the interstitium, so a plasma ultrafiltrate pours into the alveoli. Ventilation whips it into foam, and red cells crossing the damaged membrane give the pink tinge. Option a is incorrect because eroded bronchial vessels give frank red blood, as in bronchiectasis or advanced mitral stenosis. Frothy pink fluid arising with sudden orthopnea and diffuse crackles signals alveolar flooding instead. Option c is incorrect because pneumonia yields thick yellow or rust colored sputum alongside fever, focal consolidation and leukocytosis. The sudden onset in a client with known pump failure fits a hydrostatic mechanism. Option d is incorrect because upper gastrointestinal bleeding is vomited, looks dark or like coffee grounds, and is not aerated. Sputum that foams comes from the airways, and this client has no abdominal complaint.

Correct Answer: An additional disease process is likely present

Clubbing is not a feature of uncomplicated chronic obstructive disease. Its appearance signals something added, most often bronchiectasis, a lung abscess, interstitial fibrosis or another chronic suppurative process that deserves a fresh workup. Option b is incorrect because advancing emphysema shows itself through worsening breathlessness, weight loss, a barrel shaped chest and diminished breath sounds. Nail and fingertip shape stay unchanged no matter how far the destruction goes. Option c is incorrect because retained carbon dioxide produces drowsiness, headache, flushed skin and a bounding pulse. None of that alters the angle between the nail plate and the fold behind it. Option d is incorrect because smoking alone thickens airway walls and destroys alveoli without reshaping the digits. Millions of smokers with obstructive disease never club, which is precisely why the sign carries weight.

Correct Answer: Sustained pressure thickening and narrowing small vessels

Years of high pressure thicken and narrow arterioles throughout the body, producing ischemia in whatever they supply. The same process scars glomeruli, indents retinal veins at crossings, and drives the ventricle to hypertrophy against its load. Option a is incorrect because no autoimmune attack is involved in this picture. The injury is mechanical, produced by shear and sustained wall stress rather than by immune complexes settling in vessel walls. Option b is incorrect because focal lipid plaques form in large and medium arteries, not in the smallest resistance vessels. Arterioles instead undergo hyaline thickening, a different lesion with a different appearance. Option d is incorrect because venous return is not the failing element here; the problem sits on the arterial side. Reduced filling would lower cardiac output and could never explain a ventricle that grew thicker.

Correct Answer: Empyema from bacterial invasion of pleural fluid

Infected pleural fluid becomes frank pus. The high protein and lactate dehydrogenase mark an exudate, the low glucose reflects bacterial and neutrophil consumption, and drainage rather than antibiotics alone is required. Option a is incorrect because a pressure driven transudate is thin, clear and pale yellow with low protein, and it arises from heart failure or low albumin states rather than from infection. Option b is incorrect because lymph leaking from a torn thoracic duct looks milky and is loaded with triglycerides. Chest surgery or tumor invasion causes it, not a resolving pneumonia. Option c is incorrect because blood in the pleural space follows trauma, anticoagulation or malignancy and drains as frank blood with a hematocrit close to that of the circulation. This fluid is purulent instead.

Correct Answer: Flooded alveoli remain perfused but no longer ventilated

Damage to the alveolar capillary membrane lets protein rich fluid pour in and destroys surfactant, so alveoli fill or collapse while blood keeps flowing past. That is shunt, and added oxygen never reaches it. Option b is incorrect because losing blood flow to open alveoli creates dead space, and dead space hypoxemia does improve when the inspired concentration climbs. The chest film here shows filled lung, not empty vessels. Option c is incorrect because a failed respiratory center produces slow shallow breathing with a climbing carbon dioxide level. This client is breathing hard and fast, which is the opposite of a suppressed drive. Option d is incorrect because a leftward shifted curve reduces unloading at the tissues without preventing the lung from loading oxygen in the first place. Here the blood never gets oxygenated at all.

Correct Answer: Latent infection with dormant walled off organisms

A positive skin test only proves that infection occurred. With no symptoms, clear imaging and negative smears, the bacilli remain dormant inside granulomas, and this client cannot transmit the organism. Option a is incorrect because active disease produces cough lasting weeks, night sweats, weight loss and upper lobe infiltrates, with organisms visible on smear. Every one of those markers is absent here. Option c is incorrect because miliary spread scatters countless tiny lesions through both lungs and other organs, giving a striking abnormal film in a client who is usually quite ill. Option d is incorrect because prior vaccination can raise skin test reactivity, yet it never means that living bacilli are absent. Interferon release blood assays exist precisely to settle that ambiguity.

Correct Answer: A vegetation fragment lodging in a cerebral artery

Vegetations sit on the left sided valve, so pieces that break loose enter the aorta and travel to the brain. Stroke is the most feared embolic complication of left sided endocarditis. Option a is incorrect because immune complex deposition in the kidney shows up as hematuria and rising creatinine. Renal involvement is real in this disease, yet it cannot produce sudden one sided weakness. Option b is incorrect because drug related eighth nerve injury causes hearing loss, ringing and vertigo that build gradually. Motor weakness with speech difficulty maps to a cerebral vessel, not to an auditory nerve. Option d is incorrect because organisms in this disease stay inside a fibrin platelet mesh on the valve and spread as solid emboli. Diffuse toxin spread through spinal fluid describes meningitis instead.

Correct Answer: Chronic bronchitis by its clinical definition

Chronic bronchitis is defined by symptoms rather than by tissue findings. A productive cough on most days for at least three months in each of two consecutive years meets the criterion. Option a is incorrect because emphysema is defined anatomically by enlarged airspaces and destroyed alveolar walls, and its dominant complaint is breathlessness rather than sputum. Cough in emphysema tends to be scanty and dry. Option c is incorrect because permanently dilated bronchi produce enormous volumes of foul purulent sputum, often with streaks of blood and clubbed fingers. This client's ordinary morning cough does not reach that description. Option d is incorrect because the asthmatic cough comes in episodes that reverse with a bronchodilator, typically at night or after a trigger. Continuous winter after winter sputum production belongs to a different pattern.

Correct Answer: Perfusion of alveoli filled with inflammatory exudate

Exudate packs the alveoli while capillary blood keeps flowing past them, so that blood returns unoxygenated. Shunted blood never meets the added oxygen, which is why raising the concentration barely moves the arterial value. Option a is incorrect because a thickened membrane describes fibrosis or interstitial edema, where oxygen still reaches ventilated alveoli and a higher inspired concentration widens the gradient enough to raise the arterial level. Option b is incorrect because ventilation without perfusion defines dead space, the pattern seen when an embolus blocks a pulmonary artery. Consolidated lung is the reverse situation, since blood flow continues through airless tissue. Option d is incorrect because low hemoglobin lowers oxygen carrying capacity while the arterial oxygen tension stays normal. This client has a lung filled with pus and fluid, not a transport failure in the blood.