Lower Respiratory Problems Exam with 200 Questions and
Answers | Updated 2026 A+ | Instant Download PDF
Table of Contents
1. Airway Obstruction and Obstructive Pulmonary Diseases
2. Infectious and Inflammatory Pulmonary Conditions
3. Vascular, Interstitial, and Pleural Disorders
4. Critical Care, Mechanical Ventilation, and Acute Respiratory Failure
1. A 68-year-old male with chronic obstructive pulmonary disease (COPD) presents with acute
worsening dyspnea, use of accessory muscles, and a respiratory rate of 28 breaths/min.
Arterial blood gas (ABG) reveals pH 7.31, PaCO2 60 mmHg, PaO2 55 mmHg, and HCO3 31
mEq/L. Which initial ventilator management or medical intervention is most appropriate?
A. Immediate endotracheal intubation and invasive mechanical ventilation
B. Initiation of non-invasive positive pressure ventilation (NIPPV) with bi-level support
C. High-flow nasal cannula oxygen therapy targeting an oxygen saturation of 98% to 100%
D. Administration of sodium bicarbonate to correct the uncompensated respiratory acidosis
Rationale: NIPPV decreases intubation rates, reduces hospital mortality, and corrects hypercapnic
respiratory failure in acute COPD exacerbations without the risks of invasive ventilation.
2. A patient with severe asthma exacerbation fails to respond to initial beta-2 agonists and
systemic corticosteroids. Physical examination reveals silent chest, exhaustion, and
paradoxical breathing. Which diagnostic test is most critical to evaluate the severity of this
acute deterioration?
A. Sputum Gram stain and culture
B. Chest radiography to rule out consolidation
C. Serial peak expiratory flow (PEF) and arterial blood gas analysis
D. Complete blood count with differential
Rationale: ABG analysis detects life-threatening hypercapnia indicating impending respiratory
fatigue, while serial PEF measures functional airflow limitation.
3. During the management of a patient with cystic fibrosis, chronic Pseudomonas aeruginosa
colonization is identified. Which pharmacological intervention is specifically indicated to
disrupt bacterial biofilm and reduce exacerbation frequency?
A. Oral azithromycin used solely for its anti-inflammatory properties
,B. Intravenous vancomycin combined with oral ciprofloxacin
C. Inhaled tobramycin administered in alternating 28-day on/off cycles
D. Daily prophylactic oral penicillin V potassium therapy
Rationale: Inhaled tobramycin targets high local drug concentrations in the bronchial tree to
suppress Pseudomonas without systemic toxicity.
4. A 55-year-old female presents with progressive dyspnea and a dry cough. High-resolution
computed tomography (HRCT) shows subpleural honeycombing, traction bronchiectasis, and
a usual interstitial pneumonia (UIP) pattern. Pulmonary function tests show a restrictive
pattern with a severely reduced diffusing capacity of the lung for carbon monoxide (DLCO).
Which antifibrotic agent slows functional decline in this condition?
A. Prednisone combined with azathioprine
B. Nintedanib or pirfenidone
C. Sildenafil monotherapy
D. Montelukast
Rationale: Nintedanib and pirfenidone are approved antifibrotic medications that slow the rate of
forced vital capacity decline in idiopathic pulmonary fibrosis.
5. A patient with a massive pulmonary embolism presents with sudden hypotension, syncope,
and distended neck veins. Echocardiography demonstrates acute right ventricular strain and
McConnell sign. What is the primary therapeutic indication for thrombolytic therapy in this
setting?
A. Prevention of chronic thromboembolic pulmonary hypertension
B. Rapid restoration of pulmonary perfusion to reverse obstructive shock
C. Reduction of distal deep venous thrombosis propagation
D. Immediate normalization of systemic arterial blood pressure via systemic vasoconstriction
Rationale: Systemic thrombolysis rapidly dissolves clot burden to relieve right ventricular outflow
obstruction and restore hemodynamic stability in massive PE.
6. A 45-year-old man undergoes a thoracentesis for a symptomatic pleural effusion. Pleural
fluid analysis reveals a protein ratio of 0.65 compared to serum, a pleural fluid LDH of 350
IU/L, and a serum LDH upper limit of normal of 200 IU/L. According to Light's criteria, how
should this effusion be categorized?
A. Transudative effusion secondary to heart failure
B. Transudative effusion secondary to hepatic hydrothorax
C. Exudative effusion requiring further evaluation of local inflammatory processes
,D. Chylothorax secondary to thoracic duct disruption
Rationale: Meeting at least one of Light's criteria (pleural-to-serum protein > 0.5, pleural-to-serum
LDH > 0.6, or pleural LDH > 2/3 the upper limit of normal serum LDH) defines an exudate.
7. A patient with community-acquired pneumonia develops a loculated parapneumonic
effusion with a pleural fluid pH of 7.05, glucose of 30 mg/dL, and positive Gram stain. What
is the most appropriate next step in management?
A. Therapeutic thoracentesis alone with follow-up imaging in 48 hours
B. Initiation of broad-spectrum oral antibiotics and outpatient monitoring
C. Insertion of a chest tube (tube thoracostomy) with or without intrapleural fibrinolytics
D. Immediate video-assisted thoracoscopic surgery (VATS) decortication without drainage
Rationale: A complicated parapneumonic effusion or empyema indicated by low pH, low glucose, and
positive bacteria requires immediate chest tube drainage.
8. A patient is receiving mechanical ventilation with a tidal volume of 4 mL/kg predicted body
weight, a positive end-expiratory pressure (PEEP) of 12 cmH2O, and a plateau pressure of 32
cmH2O. The patient develops sudden unilateral diminished breath sounds and a drop in
oxygen saturation. Which immediate complication has occurred?
A. Mucus plugging of the mainstem bronchus
B. Tension pneumothorax secondary to high airway pressures
C. Pulmonary embolism due to prolonged immobilization
D. Acute lobar collapse from hyper-oxygenation
Rationale: High plateau pressures combined with PEEP increase barotrauma risk, manifesting as
sudden tension pneumothorax with respiratory compromise.
9. A 60-year-old smoker is evaluated for chronic cough productive of sputum for 3 consecutive
months over 2 successive years. Pulmonary function tests demonstrate an FEV1/FVC ratio of
65% and an FEV1 of 52% of predicted that does not normalize post-bronchodilator. What
pathological airway changes characterize this condition?
A. Destructive enlargement of alveolar spaces and loss of elastic recoil
B. Granulomatous inflammation of the pulmonary interstitium and lymph nodes
C. Hyperplasia of mucus-secreting submucosal glands and chronic bronchial inflammation
D. IgE-mediated bronchospasm with reversible airway remodeling
Rationale: Chronic bronchitis is defined clinically by chronic productive cough and pathologically by
mucous gland hypertrophy, goblet cell hyperplasia, and airway wall inflammation.
, 10. In a patient with alpha-1 antitrypsin deficiency-related panacinar emphysema, destruction of
lung parenchyma predominantly occurs in which anatomical region of the acinus?
A. Terminal bronchioles and respiratory bronchioles exclusively
B. Respiratory bronchioles down to the alveoli (panacinar distribution)
C. Centrilobular regions associated with heavy cigarette smoke exposure
D. Pleural surfaces with sparing of deep lung parenchyma
Rationale: Alpha-1 antitrypsin deficiency causes an uninhibited protease activity that uniformly
destroys the acinus from the respiratory bronchiole to the alveoli, typically worse in lung bases.
11. A 30-year-old asthmatic patient presents with recurrent pulmonary infiltrates, peripheral
blood eosinophilia, elevated serum IgE, and immediate cutaneous reactivity to Aspergillus
fumigatus. What is the definitive diagnosis?
A. Churg-Strauss syndrome (eosinophilic granulomatosis with polyangiitis)
B. Löffler syndrome secondary to parasitic migration
C. Allergic bronchopulmonary aspergillosis (ABPA)
D. Hypersensitivity pneumonitis from mold exposure
Rationale: ABPA is an immunologic hypersensitivity reaction to Aspergillus colonization in the
airways, characterized by asthma, eosinophilia, high IgE, and central bronchiectasis.
12. A patient with severe pulmonary arterial hypertension (PAH) is evaluated for targeted
pharmacotherapy. Which medication acts as a prostacyclin receptor agonist to promote
vasodilation and inhibit platelet aggregation?
A. Bosentan
B. Sildenafil
C. Epoprostenol or treprostinil
D. Riociguat
Rationale: Epoprostenol and treprostinil are synthetic prostacyclin analogues that induce potent
vasodilation of the pulmonary vascular bed and inhibit smooth muscle proliferation.
13. A 50-year-old metal worker presents with progressive dyspnea and non-productive cough.
Chest radiograph shows bilateral upper lobe calcified pleural plaques and interstitial
infiltrates. Biopsy reveals birefringent particles surrounded by ferruginous bodies. What is
the primary occupational exposure?
A. Coal dust leading to simple coal worker's pneumoconiosis
Answers | Updated 2026 A+ | Instant Download PDF
Table of Contents
1. Airway Obstruction and Obstructive Pulmonary Diseases
2. Infectious and Inflammatory Pulmonary Conditions
3. Vascular, Interstitial, and Pleural Disorders
4. Critical Care, Mechanical Ventilation, and Acute Respiratory Failure
1. A 68-year-old male with chronic obstructive pulmonary disease (COPD) presents with acute
worsening dyspnea, use of accessory muscles, and a respiratory rate of 28 breaths/min.
Arterial blood gas (ABG) reveals pH 7.31, PaCO2 60 mmHg, PaO2 55 mmHg, and HCO3 31
mEq/L. Which initial ventilator management or medical intervention is most appropriate?
A. Immediate endotracheal intubation and invasive mechanical ventilation
B. Initiation of non-invasive positive pressure ventilation (NIPPV) with bi-level support
C. High-flow nasal cannula oxygen therapy targeting an oxygen saturation of 98% to 100%
D. Administration of sodium bicarbonate to correct the uncompensated respiratory acidosis
Rationale: NIPPV decreases intubation rates, reduces hospital mortality, and corrects hypercapnic
respiratory failure in acute COPD exacerbations without the risks of invasive ventilation.
2. A patient with severe asthma exacerbation fails to respond to initial beta-2 agonists and
systemic corticosteroids. Physical examination reveals silent chest, exhaustion, and
paradoxical breathing. Which diagnostic test is most critical to evaluate the severity of this
acute deterioration?
A. Sputum Gram stain and culture
B. Chest radiography to rule out consolidation
C. Serial peak expiratory flow (PEF) and arterial blood gas analysis
D. Complete blood count with differential
Rationale: ABG analysis detects life-threatening hypercapnia indicating impending respiratory
fatigue, while serial PEF measures functional airflow limitation.
3. During the management of a patient with cystic fibrosis, chronic Pseudomonas aeruginosa
colonization is identified. Which pharmacological intervention is specifically indicated to
disrupt bacterial biofilm and reduce exacerbation frequency?
A. Oral azithromycin used solely for its anti-inflammatory properties
,B. Intravenous vancomycin combined with oral ciprofloxacin
C. Inhaled tobramycin administered in alternating 28-day on/off cycles
D. Daily prophylactic oral penicillin V potassium therapy
Rationale: Inhaled tobramycin targets high local drug concentrations in the bronchial tree to
suppress Pseudomonas without systemic toxicity.
4. A 55-year-old female presents with progressive dyspnea and a dry cough. High-resolution
computed tomography (HRCT) shows subpleural honeycombing, traction bronchiectasis, and
a usual interstitial pneumonia (UIP) pattern. Pulmonary function tests show a restrictive
pattern with a severely reduced diffusing capacity of the lung for carbon monoxide (DLCO).
Which antifibrotic agent slows functional decline in this condition?
A. Prednisone combined with azathioprine
B. Nintedanib or pirfenidone
C. Sildenafil monotherapy
D. Montelukast
Rationale: Nintedanib and pirfenidone are approved antifibrotic medications that slow the rate of
forced vital capacity decline in idiopathic pulmonary fibrosis.
5. A patient with a massive pulmonary embolism presents with sudden hypotension, syncope,
and distended neck veins. Echocardiography demonstrates acute right ventricular strain and
McConnell sign. What is the primary therapeutic indication for thrombolytic therapy in this
setting?
A. Prevention of chronic thromboembolic pulmonary hypertension
B. Rapid restoration of pulmonary perfusion to reverse obstructive shock
C. Reduction of distal deep venous thrombosis propagation
D. Immediate normalization of systemic arterial blood pressure via systemic vasoconstriction
Rationale: Systemic thrombolysis rapidly dissolves clot burden to relieve right ventricular outflow
obstruction and restore hemodynamic stability in massive PE.
6. A 45-year-old man undergoes a thoracentesis for a symptomatic pleural effusion. Pleural
fluid analysis reveals a protein ratio of 0.65 compared to serum, a pleural fluid LDH of 350
IU/L, and a serum LDH upper limit of normal of 200 IU/L. According to Light's criteria, how
should this effusion be categorized?
A. Transudative effusion secondary to heart failure
B. Transudative effusion secondary to hepatic hydrothorax
C. Exudative effusion requiring further evaluation of local inflammatory processes
,D. Chylothorax secondary to thoracic duct disruption
Rationale: Meeting at least one of Light's criteria (pleural-to-serum protein > 0.5, pleural-to-serum
LDH > 0.6, or pleural LDH > 2/3 the upper limit of normal serum LDH) defines an exudate.
7. A patient with community-acquired pneumonia develops a loculated parapneumonic
effusion with a pleural fluid pH of 7.05, glucose of 30 mg/dL, and positive Gram stain. What
is the most appropriate next step in management?
A. Therapeutic thoracentesis alone with follow-up imaging in 48 hours
B. Initiation of broad-spectrum oral antibiotics and outpatient monitoring
C. Insertion of a chest tube (tube thoracostomy) with or without intrapleural fibrinolytics
D. Immediate video-assisted thoracoscopic surgery (VATS) decortication without drainage
Rationale: A complicated parapneumonic effusion or empyema indicated by low pH, low glucose, and
positive bacteria requires immediate chest tube drainage.
8. A patient is receiving mechanical ventilation with a tidal volume of 4 mL/kg predicted body
weight, a positive end-expiratory pressure (PEEP) of 12 cmH2O, and a plateau pressure of 32
cmH2O. The patient develops sudden unilateral diminished breath sounds and a drop in
oxygen saturation. Which immediate complication has occurred?
A. Mucus plugging of the mainstem bronchus
B. Tension pneumothorax secondary to high airway pressures
C. Pulmonary embolism due to prolonged immobilization
D. Acute lobar collapse from hyper-oxygenation
Rationale: High plateau pressures combined with PEEP increase barotrauma risk, manifesting as
sudden tension pneumothorax with respiratory compromise.
9. A 60-year-old smoker is evaluated for chronic cough productive of sputum for 3 consecutive
months over 2 successive years. Pulmonary function tests demonstrate an FEV1/FVC ratio of
65% and an FEV1 of 52% of predicted that does not normalize post-bronchodilator. What
pathological airway changes characterize this condition?
A. Destructive enlargement of alveolar spaces and loss of elastic recoil
B. Granulomatous inflammation of the pulmonary interstitium and lymph nodes
C. Hyperplasia of mucus-secreting submucosal glands and chronic bronchial inflammation
D. IgE-mediated bronchospasm with reversible airway remodeling
Rationale: Chronic bronchitis is defined clinically by chronic productive cough and pathologically by
mucous gland hypertrophy, goblet cell hyperplasia, and airway wall inflammation.
, 10. In a patient with alpha-1 antitrypsin deficiency-related panacinar emphysema, destruction of
lung parenchyma predominantly occurs in which anatomical region of the acinus?
A. Terminal bronchioles and respiratory bronchioles exclusively
B. Respiratory bronchioles down to the alveoli (panacinar distribution)
C. Centrilobular regions associated with heavy cigarette smoke exposure
D. Pleural surfaces with sparing of deep lung parenchyma
Rationale: Alpha-1 antitrypsin deficiency causes an uninhibited protease activity that uniformly
destroys the acinus from the respiratory bronchiole to the alveoli, typically worse in lung bases.
11. A 30-year-old asthmatic patient presents with recurrent pulmonary infiltrates, peripheral
blood eosinophilia, elevated serum IgE, and immediate cutaneous reactivity to Aspergillus
fumigatus. What is the definitive diagnosis?
A. Churg-Strauss syndrome (eosinophilic granulomatosis with polyangiitis)
B. Löffler syndrome secondary to parasitic migration
C. Allergic bronchopulmonary aspergillosis (ABPA)
D. Hypersensitivity pneumonitis from mold exposure
Rationale: ABPA is an immunologic hypersensitivity reaction to Aspergillus colonization in the
airways, characterized by asthma, eosinophilia, high IgE, and central bronchiectasis.
12. A patient with severe pulmonary arterial hypertension (PAH) is evaluated for targeted
pharmacotherapy. Which medication acts as a prostacyclin receptor agonist to promote
vasodilation and inhibit platelet aggregation?
A. Bosentan
B. Sildenafil
C. Epoprostenol or treprostinil
D. Riociguat
Rationale: Epoprostenol and treprostinil are synthetic prostacyclin analogues that induce potent
vasodilation of the pulmonary vascular bed and inhibit smooth muscle proliferation.
13. A 50-year-old metal worker presents with progressive dyspnea and non-productive cough.
Chest radiograph shows bilateral upper lobe calcified pleural plaques and interstitial
infiltrates. Biopsy reveals birefringent particles surrounded by ferruginous bodies. What is
the primary occupational exposure?
A. Coal dust leading to simple coal worker's pneumoconiosis
