KMU Past Paper Practice
Topic 14 — Upper Airway Disorders and Acute Respiratory Infections
3rd Year MBBS • 20 A-type Single Best Answer MCQs • Integrated Exam Reasoning
MCQ 1
A health team identifies diphtheria cases in a densely populated locality where several children have incomplete vaccination records. Which combination best explains the potential for continued community transmission?
Options:
- Animal reservoir with seasonal vector activity
- Water contamination with prolonged environmental survival
- Human reservoir with close respiratory exposure and susceptible hosts
- Food contamination with inadequate intestinal immunity
- Soil contamination with repeated occupational exposure
MCQ 2
Question:
Two neighboring districts report similar numbers of imported diphtheria exposures. District X has high routine childhood immunization coverage, whereas District Y has substantial pockets of missed vaccination. Which outcome is most likely in District Y?
Options:
- Greater likelihood of sustained local spread
- Lower probability of symptomatic infection
- Reduced need for contact assessment
- Greater protection from respiratory exposure
- Reduced importance of case recognition
MCQ 3
Question:
A pertussis case is detected in a household containing a young infant. The parents ask why the health team is particularly concerned about exposure within the home. Which epidemiological characteristic provides the best explanation?
Options:
- Transmission depends mainly on contaminated food
- Close respiratory exposure facilitates person-to-person spread
- Infection requires an intermediate animal host
- Transmission occurs predominantly through skin contact
- Environmental contamination is the major reservoir
MCQ 4
Question:
A vaccination campaign in an under-immunized community substantially increases coverage against diphtheria and pertussis. Which change represents the principal population-level benefit?
Options:
- Elimination of respiratory droplets from the environment
- Removal of all bacterial carriage after vaccination
- Replacement of case detection by population screening
- Reduction in the proportion of susceptible children
- Prevention of every childhood respiratory infection
MCQ 5
Question:
An ENT clinic evaluates a teacher with chronic hoarseness related to heavy occupational voice use. Small paired lesions are found on the vocal folds. Symptoms persist despite appropriate voice modification and therapy. Which next step is most appropriate?
Options:
- Emergency airway creation
- Empirical antibacterial therapy
- Observation without further assessment
- Treatment for acute supraglottic infection
- Further ENT assessment for persistent lesions
MCQ 6
Question:
A man with a symptomatic laryngocele reports intermittent hoarseness and upper-neck fullness. The lesion continues to enlarge and increasingly interferes with his voice. Which management principle is most appropriate?
Options:
- ENT evaluation for definitive surgical management
- Routine corticosteroid treatment for viral edema
- Long-term antibacterial prophylaxis
- Voice therapy as the only required treatment
- Population immunization against respiratory infection
MCQ 7
Question:
A patient develops persistent voice weakness after surgery near the course of a laryngeal motor nerve. Before planning long-term treatment, which investigation principle is most useful for confirming the functional abnormality?
Options:
- Culture of respiratory secretions
- Visualization of vocal-fold movement
- Measurement of childhood vaccine coverage
- Examination for subglottic viral edema
- Assessment of an air-filled cervical sac
MCQ 8
Question:
A patient with unilateral vocal-cord paralysis has troublesome dysphonia but no respiratory distress. Which management approach best matches the functional problem?
Options:
- Immediate emergency tracheotomy
- Nebulized adrenaline followed by observation
- Systemic antibiotics for supraglottic infection
- Voice rehabilitation with selected corrective procedures if persistent
- Routine isolation and assessment of household contacts
MCQ 9
Question:
An adult with progressive bilateral vocal-fold dysfunction is assessed before symptoms become severe. Which physiological event during inspiration would indicate the greatest risk of subsequent airway compromise?
Options:
- Increased movement of the epiglottis
- Reduced vibration during phonation
- Failure of adequate glottic widening
- Expansion of the laryngeal saccule
- Repeated collision during phonation
MCQ 10
Question:
An unconscious patient with major laryngeal trauma has rapidly worsening upper-airway obstruction. Conventional airway access cannot be established adequately. Which principle most strongly supports proceeding to an emergency tracheotomy?
Options:
- Voice preservation takes priority over ventilation
- Airway access below the obstruction can restore airflow
- Tracheotomy directly reverses laryngeal nerve injury
- The procedure eliminates subsequent airway complications
- Upper-airway trauma is treated by vocal rest alone
MCQ 11
Question:
A patient undergoing emergency tracheotomy has markedly distorted neck anatomy from previous surgery. How should this finding influence the decision when the airway cannot otherwise be secured?
Options:
- It proves the airway obstruction is functional
- It converts the procedure into voice rehabilitation
- It removes the need for experienced airway support
- It guarantees injury to adjacent structures
- It increases procedural difficulty but remains a relative consideration
MCQ 12
Question:
A tracheotomy patient initially ventilates well but suddenly develops respiratory difficulty because thick secretions occlude the tube. Which category best describes this event?
Options:
- Late scar-related complication
- Chronic fistulous complication
- Early tube-related airway complication
- Primary laryngeal neurological complication
- Delayed vocal-fold structural lesion
MCQ 13
Question:
A 2-year-old with croup develops increasing respiratory effort. The parents ask why relatively modest mucosal swelling can produce prominent airway symptoms in a young child. Which explanation is most appropriate?
Options:
- The epiglottis becomes paralyzed during viral infection
- Viral infection produces a communicating cervical air sac
- The recurrent laryngeal nerves become bilaterally divided
- A small reduction in an already narrow airway markedly impedes airflow
- Subglottic inflammation primarily prevents swallowing
MCQ 14
Question:
A child with clinically diagnosed croup improves after treatment aimed at reducing laryngeal inflammation. Which pathological change was primarily responsible for the airway symptoms?
Options:
- Edema causing narrowing below the glottis
- Air-filled expansion through the thyrohyoid membrane
- Mechanical injury producing paired vocal lesions
- Loss of bilateral recurrent laryngeal motor function
- Bacterial swelling centered above the glottis
MCQ 15
Question:
A child with moderate croup receives corticosteroid therapy. The parent asks how this treatment improves the airway problem. Which effect best explains its benefit?
Options:
- It eliminates bacterial carriage from the pharynx
- It restores recurrent laryngeal nerve conduction
- It reduces inflammatory swelling of the airway mucosa
- It removes structural vocal-fold lesions
- It prevents expansion of the laryngeal saccule
MCQ 16
Question:
A febrile child with suspected epiglottitis is sitting upright and resisting attempts to lie down. Which interpretation best explains why maintaining the child’s preferred position and minimizing agitation are important?
Options:
- The position prevents development of pertussis
- Agitation may worsen an already threatened upper airway
- Recumbency produces bilateral vocal nodules
- Sitting upright directly eliminates bacterial infection
- The position reverses laryngeal nerve paralysis
MCQ 17
Question:
A pediatric resident is comparing two children with upper-airway obstruction. Child X has prominent cough and hoarseness; Child Y has painful swallowing, difficulty handling secretions and a muffled voice. Which functional disturbance best accounts for Child Y’s swallowing-related presentation?
Options:
- Subglottic edema from viral laryngotracheal disease
- Chronic phonotrauma affecting paired vocal-fold sites
- Air trapping within a dilated laryngeal saccule
- Failure of one vocal fold to move after nerve injury
- Inflammatory swelling of supraglottic structures
MCQ 18
Question:
Following widespread use of an effective childhood vaccine, a formerly important bacterial cause of epiglottitis becomes much less common. Which organism is classically associated with this change?
Options:
- Haemophilus influenzae type b
- Bordetella pertussis
- Corynebacterium diphtheriae
- Parainfluenza virus
- Streptococcus pneumoniae
MCQ 19
Question:
A community programme already provides childhood immunization and promotes adequate nutrition. Respiratory infections remain frequent in households where several adults smoke indoors. Which additional intervention most directly addresses this environmental determinant?
Options:
- Routine antibiotic treatment of healthy children
- Annual laryngoscopy of all household members
- Reduction of children’s exposure to indoor tobacco smoke
- Restriction of normal outdoor physical activity
- Routine radiography after minor respiratory symptoms
MCQ 20
Question:
A primary-care programme combines routine immunization, breastfeeding support, respiratory hygiene and reduced household smoke exposure. Which additional component would most effectively reduce adverse outcomes once a child develops a severe respiratory infection?
Options:
- Routine antibiotic use for every cough
- Screening healthy children with chest imaging
- Avoidance of routine childhood physical activity
- Early recognition and referral of respiratory danger signs
- Voice therapy during every respiratory infection