KMU Past Paper Practice

Question:
A 64-year-old man presents with fever, productive cough and pleuritic pain. Examination suggests consolidation. A lung specimen shows patchy areas of acute suppurative inflammation centered around bronchi and bronchioles, with involvement of more than one lobe. Which pathological pattern is most likely?

Correct Answer: Bronchopneumonia

Explanation: Bronchopneumonia produces patchy suppurative consolidation centered on bronchi and bronchioles, commonly with multilobar involvement.

Question:
A patient treated for lobar bacterial pneumonia becomes afebrile and clinically improves. Microscopy shows enzymatic digestion of intra-alveolar fibrinous material with macrophages removing the remaining debris. Which outcome is expected if healing remains uncomplicated?

Correct Answer: Restoration of lung architecture

Explanation: During uncomplicated resolution, macrophages clear the digested exudate and the preserved pulmonary framework permits restoration of normal architecture.

Question:
A 29-year-old woman has fever, headache, malaise and dry cough. Imaging demonstrates bilateral patchy interstitial infiltrates. Which anatomical component is expected to contain the predominant inflammatory reaction?

Correct Answer: Alveolar septa

Explanation: Atypical pneumonia predominantly causes mononuclear inflammation of alveolar septa and interstitium rather than dense neutrophilic filling of alveoli.

Question:
A 69-year-old patient has been mechanically ventilated for several days. He develops fever and purulent tracheal secretions. Which alteration in pulmonary defense produced by the endotracheal tube most directly predisposes him to infection?

Correct Answer: Interference with normal airway clearance

Explanation: Endotracheal intubation bypasses upper-airway defenses and interferes with mucociliary clearance, facilitating lower-airway colonization and infection.

Question:
A man with a persistent pulmonary infection has progressive tissue destruction followed by healing of affected areas. Which structural change is most likely after prolonged chronic inflammation?

Correct Answer: Fibrosis of damaged pulmonary tissue

Explanation: Persistent inflammation and tissue destruction stimulate repair by granulation tissue and collagen deposition, producing pulmonary fibrosis.

Question:
A patient with impaired immunity develops severe pneumonia. The clinician considers organisms that rarely produce serious pulmonary disease in an immunocompetent host. Which organism from the topic best illustrates this principle?

Correct Answer: Pneumocystis jirovecii

Explanation: Pneumocystis jirovecii is an important opportunistic pulmonary pathogen whose clinical significance rises markedly when host immunity is impaired.

Question:
A patient with a pulmonary abscess suddenly develops pleuritic pain and worsening fever. Imaging demonstrates a new infected pleural collection adjacent to the cavity. Which event most likely produced this complication?

Correct Answer: Spread of infection into the pleural space

Explanation: Extension of suppurative infection from an adjacent lung abscess through the visceral pleura can produce empyema.

Question:
A lung cavity containing pus persists for several weeks. Histological examination of its margin shows newly formed capillaries and proliferating fibroblasts surrounding the area of suppuration. Which process is occurring at the cavity wall?

Correct Answer: Granulation tissue formation

Explanation: A persistent abscess develops granulation tissue at its margin, which may subsequently mature into fibrous scar tissue.

Question:
A man develops severe pneumonia after inhaling contaminated water aerosols. Alveolar macrophages phagocytose the organism, but bacterial multiplication continues within these cells. Which microbial property best explains persistence?

Correct Answer: Ability to survive intracellular killing

Explanation: Legionella survives and multiplies within macrophages by interfering with normal intracellular microbial killing.

Question:
A young adult with atypical pneumonia is found to have infection with Mycoplasma pneumoniae. A drug that acts only by blocking bacterial peptidoglycan synthesis would be ineffective. Which structural feature explains this finding?

Correct Answer: Absence of a peptidoglycan cell wall

Explanation: Mycoplasma lacks peptidoglycan, so drugs whose antibacterial effect depends on inhibiting cell-wall synthesis lack their required target.

Question:
A respiratory isolate from a child is a small pleomorphic gram-negative coccobacillus. It fails to grow on simple laboratory media but grows when specific nutritional factors are supplied. Which organism best fits these findings?

Correct Answer: Haemophilus influenzae

Explanation: H. influenzae is a fastidious pleomorphic gram-negative coccobacillus requiring enriched conditions and specific growth factors.

Question:
A child develops prolonged paroxysmal coughing after a respiratory infection. The responsible organism remains mainly attached to the ciliated epithelium rather than deeply invading tissue. Which pathogenic effect most directly promotes persistence of respiratory secretions?

Correct Answer: Impairment of mucociliary clearance

Explanation: Bordetella pertussis attaches to ciliated epithelium and disrupts ciliary function, reducing secretion clearance and contributing to severe coughing episodes.

Question:
A patient with a dry irritating cough requires symptomatic suppression but wishes to avoid an opioid drug. The prescribed medicine acts centrally and does not provide the typical analgesic effect of opioid antitussives. Which drug was most likely selected?

Correct Answer: Dextromethorphan

Explanation: Dextromethorphan is a centrally acting non-opioid antitussive that suppresses troublesome nonproductive cough without typical opioid analgesia.

Question:
A patient has a productive cough with substantial airway secretions. He asks for a strong centrally acting cough suppressant. Which pharmacological principle is most relevant before selecting such therapy?

Correct Answer: Suppressing cough may impair secretion clearance

Explanation: Productive coughing helps remove secretions; excessive antitussive suppression can therefore interfere with an important airway-clearance mechanism.

Question:
A patient with thick bronchial secretions receives acetylcysteine. Shortly afterward, the mucus becomes less viscous and easier to expectorate. Which molecular change produced this effect?

Correct Answer: Disruption of bonds within mucus glycoproteins

Explanation: Acetylcysteine disrupts disulfide bonds within mucus glycoproteins, decreasing mucus viscosity and facilitating expectoration.

Question:
A 5-year-old child presents with cough and difficult breathing. He has fast breathing but remains alert, drinks normally and has no general danger sign. Under the IMNCI clinical approach, which classification is most appropriate?

Correct Answer: Pneumonia

Explanation: In the IMNCI approach, cough or difficult breathing accompanied by fast breathing supports classification as pneumonia when severe danger signs are absent.

Question:
A 2-year-old child has recurrent pneumonia. The episodes are associated with coughing during feeding, and the child has difficulty coordinating swallowing. Which mechanism most likely explains the recurrent lower respiratory infections?

Correct Answer: Repeated aspiration into the airways

Explanation: Swallowing dysfunction permits repeated entry of food or secretions into the lower airways, predisposing the child to recurrent pneumonia.

Question:
A school-age child develops community-acquired pneumonia. The physician considers both typical bacterial pathogens and organisms producing an atypical pattern. Which age-related change is most relevant to the likely etiology?

Correct Answer: Mycoplasma becomes an important pathogen

Explanation: In school-age children and adolescents, Mycoplasma pneumoniae becomes an increasingly important cause of community-acquired atypical pneumonia.

Question:
A 4-year-old child with pneumonia is tachypneic but alert and drinking. Several hours later, he becomes lethargic and develops marked respiratory distress. Which change has the greatest significance for the level of care required?

Correct Answer: Development of severe clinical features

Explanation: Lethargy and marked respiratory distress indicate progression to severe illness and support urgent referral or hospital-level assessment.

Question:
A patient with bacterial pneumonia develops persistent fever despite initial improvement. Imaging now demonstrates a collection outside the lung parenchyma that compresses the adjacent lung. Which pathological location best identifies the new complication?

Correct Answer: Pleural cavity

Explanation: Empyema is a purulent collection within the pleural cavity; its extrapulmonary location distinguishes it from a lung abscess within parenchyma.