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Pneumologia SBPT study materials
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Pneumologia SBPT practice questions

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Question 1Pneumologia Geral

A 24-year-old with acute pleuritic chest pain has an arterial blood gas showing pH 7.50, PaCO2 30 mmHg, and HCO3 24 mEq/L. Which acid-base disturbance is present?

  1. Metabolic acidosis with respiratory compensation
  2. Metabolic alkalosis with respiratory compensation
  3. Acute respiratory alkalosis Correct answer.
  4. Acute respiratory acidosis

Explanation

A primary fall in PaCO2 with a matching rise in pH defines respiratory alkalosis, and a normal bicarbonate indicates the process is acute rather than compensated. Hyperventilation from pain or hypoxia commonly produces this pattern.

Question 2Pneumologia Geral

Which finding on spirometry is characteristic of a restrictive ventilatory defect?

  1. Reduced total lung capacity with a preserved or increased FEV1/FVC ratio Correct answer.
  2. Increased residual volume with air trapping on expiratory imaging
  3. Reduced FEV1 with a reduced FEV1/FVC ratio below the lower limit of normal
  4. Reversible fall in FEV1 of more than 12% after bronchodilator

Explanation

Restriction is confirmed by a reduced total lung capacity, while the FEV1/FVC ratio is typically normal or even elevated because both volumes fall proportionally. Spirometry alone suggests restriction but lung volumes are needed to confirm it.

Question 3Pneumologia Geral

A patient with a large spontaneous pneumothorax develops sudden severe hypoxemia. Which mechanism best explains the hypoxemia?

  1. Low inspired oxygen partial pressure at altitude
  2. Alveolar hypoventilation from reduced respiratory drive
  3. Intrapulmonary shunt from collapsed but perfused lung Correct answer.
  4. Diffusion limitation across a thickened alveolar membrane

Explanation

Collapsed alveoli remain perfused, so blood passes through non-ventilated lung units, creating a true shunt that is poorly corrected by supplemental oxygen. This shunt physiology is the dominant cause of hypoxemia in a large pneumothorax.

Question 4Pneumologia Geral

Which organism is the most frequent cause of community-acquired pneumonia requiring hospital admission in adults?

  1. Mycoplasma pneumoniae
  2. Chlamydia psittaci
  3. Streptococcus pneumoniae Correct answer.
  4. Legionella pneumophila

Explanation

Streptococcus pneumoniae remains the leading identified cause of community-acquired pneumonia across severity levels, including patients who need admission. Atypical organisms are common but less frequently confirmed as the sole pathogen in hospitalized adults.

Question 5Pneumologia Geral

Which parameter is used to define the severity of airflow limitation in the GOLD classification of COPD?

  1. Post-bronchodilator FEV1 expressed as percent of predicted Correct answer.
  2. Residual volume to total lung capacity ratio
  3. Pre-bronchodilator FEV1/FVC ratio
  4. Six-minute walk distance

Explanation

The GOLD spirometric grades are based on post-bronchodilator FEV1 as a percentage of the predicted value. The FEV1/FVC ratio establishes that obstruction is present but does not grade its severity.

Question 6Pneumologia Geral

Which drug class forms the cornerstone of maintenance therapy for persistent asthma?

  1. Inhaled anticholinergics as monotherapy
  2. Short-acting beta-2 agonists
  3. Oral decongestants
  4. Inhaled corticosteroids Correct answer.

Explanation

Inhaled corticosteroids reduce airway inflammation and the risk of exacerbations, making them the preferred controller for persistent asthma. Short-acting bronchodilators relieve symptoms but do not treat the underlying inflammation.

Question 7Pneumologia Geral

Which finding on contrast-enhanced computed tomography is the reference standard for diagnosing pulmonary embolism?

  1. Bronchial wall thickening
  2. Unilateral pleural effusion
  3. Intraluminal filling defect in a pulmonary artery Correct answer.
  4. Ground-glass opacity in a lower lobe

Explanation

Computed tomography pulmonary angiography demonstrates a filling defect within a contrast-opacified pulmonary artery, which is the diagnostic hallmark of embolism. The other findings are nonspecific and do not establish the diagnosis.

Question 8Pneumologia Geral

A patient with obstructive sleep apnea has daytime sleepiness and no major comorbidity. Which test is required to confirm the diagnosis?

  1. Polysomnography or a validated home sleep apnea test Correct answer.
  2. Chest radiograph
  3. Awake arterial blood gas
  4. Resting electrocardiogram

Explanation

Diagnosis of obstructive sleep apnea requires objective documentation of apneas and hypopneas, either by in-laboratory polysomnography or a validated home sleep study. Clinical screening tools suggest risk but cannot confirm the diagnosis.

Question 9Pneumologia Geral

A 30-year-old with asthma has a pre-bronchodilator FEV1 of 68% predicted and an FEV1/FVC ratio of 0.64. After 400 mcg salbutamol, FEV1 rises by 260 mL and 15%. How is this response best interpreted?

  1. Normal spirometry with no abnormality
  2. Fixed obstruction indicating COPD
  3. Restrictive defect requiring lung volumes
  4. Significant bronchodilator reversibility supporting asthma Correct answer.

Explanation

Reversibility is defined as an increase in FEV1 of at least 12% and at least 200 mL after a bronchodilator. This patient meets both criteria, and the low ratio confirms obstruction with a reversible component consistent with asthma.

Question 10Pneumologia Geral

A 68-year-old smoker with COPD has a pH of 7.28, PaCO2 of 68 mmHg, and HCO3 of 31 mEq/L. Which interpretation is most accurate?

  1. High anion gap metabolic acidosis
  2. Acute-on-chronic respiratory acidosis Correct answer.
  3. Fully compensated metabolic alkalosis
  4. Acute respiratory alkalosis

Explanation

The elevated bicarbonate indicates chronic CO2 retention, and the acidemic pH with a further rise in PaCO2 reflects an acute decompensation superimposed on chronic respiratory acidosis. Bicarbonate has not risen enough to normalize the pH.

Question 11Pneumologia Geral

Which feature most strongly suggests a parapneumonic effusion requires chest tube drainage?

  1. Pleural fluid pH of 7.10 with loculations Correct answer.
  2. Pleural fluid glucose of 90 mg/dL
  3. Pleural fluid total protein of 3.5 g/dL
  4. Unilateral effusion of 200 mL on imaging

Explanation

A pleural fluid pH below 7.20, low glucose, positive culture, or loculation indicates complicated parapneumonic effusion or empyema that needs drainage. A low pH with loculations meets these criteria.

Question 12Pneumologia Geral

A patient with suspected pulmonary embolism has a low pretest probability and a negative D-dimer using a highly sensitive assay. What is the appropriate next step?

  1. Repeat the D-dimer in 24 hours
  2. Start therapeutic anticoagulation empirically
  3. Withhold anticoagulation and pursue no further testing for embolism Correct answer.
  4. Perform computed tomography pulmonary angiography

Explanation

A negative highly sensitive D-dimer safely excludes pulmonary embolism when pretest probability is low, so imaging and anticoagulation can be avoided. This strategy reduces unnecessary radiation and bleeding risk.

Question 13Pneumologia Geral

Which radiographic pattern is most typical of active pulmonary tuberculosis in an immunocompetent adult?

  1. Unilateral hilar enlargement with a normal parenchyma
  2. Diffuse ground-glass opacities with honeycombing
  3. Bilateral lower lobe reticular opacities
  4. Upper lobe cavitary infiltrates Correct answer.

Explanation

Reactivation tuberculosis classically involves the apical and posterior segments of the upper lobes, often with cavitation. Lower lobe and miliary patterns are more typical in immunocompromised hosts.

Question 14Pneumologia Geral

Which statement about the tuberculin skin test is correct?

  1. It distinguishes latent infection from active disease
  2. It converts to positive within 48 hours of infection
  3. It may be falsely negative in disseminated tuberculosis or immunosuppression Correct answer.
  4. It is unaffected by prior BCG vaccination

Explanation

Anergy from severe illness or immunosuppression can produce a false-negative tuberculin test, so a negative result does not exclude active disease. The test also cannot separate latent from active infection and may be influenced by prior BCG.

Question 15Pneumologia Geral

A patient with COPD has two moderate exacerbations per year and an mMRC score of 2. Which GOLD ABE group applies?

  1. Group A
  2. Group B
  3. Group E Correct answer.
  4. Group C

Explanation

In the current GOLD grouping, any patient with two or more moderate exacerbations or one leading to hospitalization is classified as group E, regardless of symptom score. The old C and D groups have been merged into E.

Question 16Pneumologia Geral

Which finding best supports a diagnosis of asthma rather than COPD in a symptomatic adult?

  1. Diffuse emphysema on high-resolution computed tomography
  2. Chronic productive cough for three months per year
  3. Progressive dyspnea with a fixed post-bronchodilator obstruction
  4. Variable expiratory airflow limitation with diurnal peak flow variability Correct answer.

Explanation

Asthma is characterized by variable airflow limitation, reflected in diurnal peak flow variability or reversibility over time. COPD typically shows persistent, largely fixed obstruction related to smoking or noxious exposures.

Question 17Pneumologia Geral

Which intervention has been shown to reduce mortality in patients with severe acute respiratory distress syndrome?

  1. Immediate tracheostomy within 48 hours
  2. Routine systemic corticosteroids in all patients
  3. Routine high tidal volume ventilation to normalize PaCO2
  4. Low tidal volume ventilation with plateau pressure limitation Correct answer.

Explanation

Lung-protective ventilation using low tidal volumes and limiting plateau pressure reduces ventilator-induced lung injury and improves survival in ARDS. Targeting normal carbon dioxide with high tidal volumes increases barotrauma and mortality.

Question 18Pneumologia Geral

A young woman has recurrent hemoptysis, nasal crusting, and a positive cytoplasmic antineutrophil cytoplasmic antibody. Which diagnosis is most likely?

  1. Sarcoidosis
  2. Idiopathic pulmonary fibrosis
  3. Hypersensitivity pneumonitis
  4. Granulomatosis with polyangiitis Correct answer.

Explanation

The combination of upper airway disease, pulmonary hemorrhage, and a positive cytoplasmic antineutrophil cytoplasmic antibody strongly suggests granulomatosis with polyangiitis. This small-vessel vasculitis frequently involves the kidneys as well.

Question 19Pneumologia Geral

Which test is most appropriate to confirm a diagnosis of obstructive sleep apnea in a patient with a pacemaker and severe heart failure?

  1. In-laboratory attended polysomnography Correct answer.
  2. Unattended home sleep apnea testing
  3. Overnight pulse oximetry alone
  4. Epworth sleepiness scale score

Explanation

Attended polysomnography is preferred when significant comorbidity is present, because home testing may underestimate severity and is less reliable in heart failure. Oximetry alone and symptom scales cannot establish the diagnosis.

Question 20Pneumologia Geral

A patient with a malignant pleural effusion has a trapped lung after incomplete drainage. What is the most appropriate next step for symptom control?

  1. Indwelling pleural catheter or pleurodesis after lung re-expansion Correct answer.
  2. Immediate surgical decortication
  3. Systemic diuretics as the primary therapy
  4. Repeated thoracentesis every 48 hours indefinitely

Explanation

When the lung cannot re-expand, an indwelling pleural catheter allows outpatient drainage and symptom relief; pleurodesis requires lung apposition to the chest wall. Frequent thoracentesis is burdensome and not a durable solution.

Question 21Pneumologia Geral

A 55-year-old with a 40 pack-year smoking history has a 2.5 cm peripheral nodule with spiculated margins and no mediastinal adenopathy. Which diagnostic approach is most appropriate?

  1. Tissue sampling by percutaneous transthoracic biopsy Correct answer.
  2. Empiric antibiotic therapy for four weeks
  3. Immediate pneumonectomy without tissue confirmation
  4. Observation with repeat imaging in 12 months

Explanation

A spiculated peripheral nodule in a high-risk smoker is highly suspicious for malignancy, and tissue diagnosis guides staging and treatment. Percutaneous biopsy is appropriate for a peripheral lesion without mediastinal disease.

Question 22Pneumologia Geral

A patient with severe COPD has a PaO2 of 52 mmHg on room air and a hematocrit of 58%. Which therapy improves survival in this setting?

  1. Inhaled short-acting bronchodilator as needed only
  2. Oral theophylline as monotherapy
  3. Prophylactic antibiotics for six months
  4. Long-term continuous oxygen therapy Correct answer.

Explanation

Long-term oxygen therapy improves survival in patients with severe resting hypoxemia, defined as a PaO2 at or below 55 mmHg, or with cor pulmonale or polycythemia at values up to 59 mmHg. This patient meets the criteria.

Question 23Pneumologia Geral

A 70-year-old with severe COPD and chronic hypercapnia has an acute exacerbation with pH 7.20 and worsening somnolence. Which ventilatory strategy is most appropriate?

  1. High-flow nasal oxygen alone targeting a normal PaCO2
  2. Sedation to reduce respiratory effort
  3. Immediate invasive intubation as first-line therapy
  4. Noninvasive ventilation with bilevel positive airway pressure Correct answer.

Explanation

Noninvasive ventilation is the preferred first-line support for hypercapnic respiratory acidosis in COPD exacerbation, reducing intubation and mortality. Invasive ventilation is reserved for failure of noninvasive support or contraindications.

Question 24Pneumologia Geral

A patient with acute respiratory distress syndrome has a PaO2/FiO2 ratio of 90 on a positive end-expiratory pressure of 14 cmH2O with bilateral infiltrates and no cardiac cause. How is this severity best classified?

  1. Moderate acute respiratory distress syndrome
  2. Not acute respiratory distress syndrome
  3. Severe acute respiratory distress syndrome Correct answer.
  4. Mild acute respiratory distress syndrome

Explanation

Severe ARDS is defined by a PaO2/FiO2 ratio of 200 or less while receiving at least 5 cmH2O of positive end-expiratory pressure. A ratio of 90 with bilateral infiltrates of noncardiac origin therefore meets the severe category.

Question 25Pneumologia Geral

A patient with cirrhosis and a large right pleural effusion has a pleural fluid total protein of 1.5 g/dL and a serum-to-pleural albumin gradient of 1.5 g/dL. What is the mechanism?

  1. Exudation from pleural infection
  2. Chylous leak from thoracic duct injury
  3. Malignant pleural involvement
  4. Transudation from portal hypertension Correct answer.

Explanation

A transudative effusion with a serum-to-pleural albumin gradient greater than 1.2 g/dL indicates portal hypertension as the cause, reflecting hydrostatic and oncotic forces. The fluid is not the result of pleural inflammation or malignancy.

Question 26Pneumologia Geral

Which spirometric criterion is required to confirm persistent airflow limitation consistent with COPD in a symptomatic adult with risk factors?

  1. A reduced diffusing capacity for carbon monoxide
  2. A pre-bronchodilator FEV1 below 80% of predicted
  3. A bronchodilator-induced rise in FEV1 exceeding 400 mL
  4. A post-bronchodilator FEV1/FVC ratio below 0.70 Correct answer.

Explanation

The diagnosis of COPD requires demonstrating persistent airflow limitation, defined spirometrically as a post-bronchodilator FEV1/FVC ratio below 0.70 in a patient with compatible symptoms and exposures. The post-bronchodilator measurement is essential because it distinguishes fixed obstruction from reversible bronchoconstriction. Neither FEV1 alone nor diffusing capacity establishes the diagnosis.

Question 27Pneumologia Geral

A patient with a large left-sided pleural effusion undergoes thoracentesis. Which finding in the pleural fluid is most consistent with an exudate by Light criteria?

  1. Pleural fluid protein of 2.0 g/dL with a serum protein of 7.0 g/dL
  2. Pleural fluid glucose of 95 mg/dL
  3. Pleural fluid pH of 7.45
  4. Pleural fluid lactate dehydrogenase of 240 U/L with a serum upper limit of 200 U/L Correct answer.

Explanation

An effusion is exudative when pleural fluid protein exceeds 0.5 of serum protein, when pleural fluid LDH exceeds 0.6 of the serum upper limit of normal, or when pleural LDH exceeds two-thirds of the upper limit of normal serum LDH. An LDH of 240 U/L exceeds 0.6 times 200 U/L, satisfying one criterion. The other listed values are typical of transudates or normal fluid.

Question 28Pneumologia Geral

Which breathing pattern is characteristically seen in a patient with a large unilateral pleural effusion?

  1. Cheyne-Stokes respiration
  2. Rapid shallow breathing with reduced ipsilateral chest expansion Correct answer.
  3. Kussmaul breathing with prolonged expiratory phase
  4. Paradoxical inward movement of the ipsilateral chest wall on inspiration

Explanation

A large pleural effusion restricts ipsilateral lung expansion, producing rapid, shallow breathing and reduced movement of the affected hemithorax. This pattern minimizes the work of breathing against reduced compliance. Cheyne-Stokes and Kussmaul patterns reflect central or metabolic disorders, and paradoxical movement suggests flail chest.

Question 29Pneumologia Geral

A patient with pneumonia develops a pleural effusion. Which pleural fluid characteristic most reliably indicates that the effusion is infected and complicated?

  1. Pleural fluid lactate dehydrogenase below 100 U/L
  2. Pleural fluid glucose above 90 mg/dL
  3. Pleural fluid pH of 7.10 Correct answer.
  4. Pleural fluid pH of 7.35

Explanation

A pleural fluid pH below 7.20, along with low glucose and high LDH, indicates a complicated parapneumonic effusion that usually requires drainage. A pH of 7.10 meets this threshold and reflects active infection and metabolic activity within the pleural space. Normal pH, glucose, and low LDH suggest a simple, uncomplicated effusion.

Question 30Pneumologia Geral

Which finding on pulmonary function testing is most characteristic of a restrictive ventilatory defect?

  1. Reduced FEV1 with a reduced FEV1/FVC ratio
  2. Increased residual volume with air trapping
  3. Increased total lung capacity with reduced diffusing capacity
  4. Reduced total lung capacity with a normal or elevated FEV1/FVC ratio Correct answer.

Explanation

A restrictive defect is defined by reduced total lung capacity, with the FEV1/FVC ratio typically normal or even elevated because both volumes fall proportionally. Confirming restriction requires lung volume measurement, since spirometry alone cannot distinguish restriction from obstruction. Increased volumes indicate hyperinflation rather than restriction.

Question 31Pneumologia Geral

A patient with a known lung malignancy develops facial swelling, distended neck veins, and a sensation of head fullness. Which diagnosis should be considered first?

  1. Tension pneumothorax
  2. Superior vena cava syndrome Correct answer.
  3. Pulmonary embolism
  4. Pericardial tamponade

Explanation

Facial swelling, neck vein distention, and head fullness in a patient with intrathoracic malignancy suggest obstruction of the superior vena cava, often from tumor compression or thrombosis. This is a classic oncologic emergency requiring urgent imaging and consideration of airway protection. The other conditions produce different dominant findings.

Question 32Pneumologia Geral

Which arterial blood gas finding indicates that a patient is maintaining adequate oxygenation?

  1. PaO2 of 90 mmHg on room air Correct answer.
  2. PaCO2 of 50 mmHg
  3. PaO2 of 55 mmHg on room air
  4. Bicarbonate of 18 mEq/L

Explanation

A PaO2 of 90 mmHg on room air reflects adequate oxygenation, since normal values are roughly 80 to 100 mmHg. PaO2 below 60 mmHg defines hypoxemic respiratory failure. PaCO2 and bicarbonate assess ventilation and acid-base status rather than oxygenation.

Question 33Pneumologia Geral

A patient with acute decompensated heart failure has bilateral crackles, orthopnea, and a BNP of 1200 pg/mL. Which initial therapy is most appropriate?

  1. Intravenous antibiotics
  2. Intravenous loop diuretic with noninvasive ventilation if needed Correct answer.
  3. Systemic corticosteroids
  4. Oral beta-blocker initiation

Explanation

Acute decompensated heart failure with volume overload and pulmonary edema is treated with intravenous loop diuretics to reduce congestion, with noninvasive ventilation added for respiratory distress. Antibiotics and corticosteroids address infection or airway inflammation, which are not the primary problem here. Beta-blockers are not started during acute decompensation.

Question 34Pneumologia Geral

A 60-year-old with COPD reports chronic productive cough and frequent exacerbations. Which intervention has the strongest evidence for reducing exacerbation frequency in patients with moderate to severe COPD?

  1. Long-acting bronchodilators with inhaled corticosteroid in selected patients Correct answer.
  2. Routine theophylline
  3. Daily oral corticosteroids
  4. Prophylactic antibiotics for all patients

Explanation

Long-acting bronchodilators, alone or combined with inhaled corticosteroids in patients with frequent exacerbations and eosinophilic inflammation, reduce exacerbation frequency in moderate to severe COPD. Inhaled therapy is preferred over systemic corticosteroids for maintenance. Theophylline and routine antibiotics are not first-line preventive strategies.

Question 35Pneumologia Geral

Which clinical feature is most suggestive of a pulmonary embolism in a patient presenting with acute dyspnea?

  1. Wheezing that improves with bronchodilators
  2. Pleuritic chest pain with sudden onset and hypoxemia in a patient with recent immobilization Correct answer.
  3. Orthopnea relieved by sitting upright
  4. Productive cough with fever and focal crackles

Explanation

Sudden pleuritic chest pain, hypoxemia, and a risk factor such as recent immobilization raise suspicion for pulmonary embolism. The presentation reflects ventilation-perfusion mismatch from obstructed pulmonary vasculature. Infection, asthma, and heart failure produce different patterns.

Question 36Pneumologia Geral

A patient with severe community-acquired pneumonia has a CURB-65 score of 3. What is the most appropriate disposition?

  1. Hospital admission, with consideration of intensive care Correct answer.
  2. Outpatient management with close follow-up
  3. Discharge home with oral antibiotics
  4. Observation in the emergency department without antibiotics

Explanation

A CURB-65 score of 3 indicates severe pneumonia with substantially increased mortality, so hospital admission is required and intensive care should be considered. Scores of 0 to 1 generally allow outpatient treatment. Delaying antibiotics or discharging such patients increases risk of adverse outcomes.

Question 37Pneumologia Geral

Which feature distinguishes an asthma exacerbation from anaphylaxis in a patient presenting with acute wheezing?

  1. Wheezing responsive to inhaled bronchodilators
  2. Presence of urticaria and hypotension after exposure to a trigger Correct answer.
  3. History of atopy
  4. Prolonged expiratory phase on auscultation

Explanation

Anaphylaxis is a systemic hypersensitivity reaction with features beyond the airway, such as urticaria, angioedema, and hypotension, often after a specific exposure. Asthma exacerbation produces bronchospasm without these systemic findings. Atopy and wheezing are shared features and do not distinguish the two.

Question 38Pneumologia Geral

A patient with a suspected malignant pleural effusion has a pleural fluid cytology that is negative on the first thoracentesis. What is the most appropriate next step?

  1. Reassure the patient that malignancy is excluded
  2. Obtain a serum tumor marker panel only
  3. Proceed directly to pleurodesis
  4. Repeat thoracentesis with cytologic examination Correct answer.

Explanation

Cytologic examination of pleural fluid has limited sensitivity, so a negative result does not exclude malignancy and repeat thoracentesis increases the diagnostic yield. If results remain negative and suspicion is high, thoracoscopy may be considered. Immediate pleurodesis without a diagnosis is inappropriate.

Question 39Pneumologia Geral

Which finding best supports a diagnosis of obstructive sleep apnea syndrome in a patient reporting snoring and witnessed apneas?

  1. An Epworth Sleepiness Scale score of 5
  2. An apnea-hypopnea index of at least 5 per hour with compatible symptoms Correct answer.
  3. A body mass index of 22 kg/m²
  4. A normal overnight oximetry study

Explanation

Obstructive sleep apnea is diagnosed when polysomnography or a validated home study shows an apnea-hypopnea index of at least 5 per hour accompanied by compatible symptoms such as daytime sleepiness. A normal oximetry study or low symptom score argues against the diagnosis. Obesity is a risk factor but not a diagnostic criterion.

Question 40Pneumologia Geral

A patient with a suspected interstitial lung disease has a restrictive pattern on spirometry. Which additional test is most useful for assessing disease severity and prognosis?

  1. Measurement of diffusing capacity for carbon monoxide Correct answer.
  2. Bronchial provocation testing
  3. Sputum culture
  4. Measurement of peak expiratory flow

Explanation

Diffusing capacity for carbon monoxide assesses gas exchange across the alveolar-capillary membrane and correlates with severity and prognosis in interstitial lung disease. It often falls before spirometry does. Sputum culture, provocation testing, and peak flow do not assess interstitial disease severity.

Question 41DPOC

A 62-year-old smoker reports chronic productive cough and dyspnea. Spirometry after bronchodilator shows FEV1/FVC of 0.58. Which finding establishes the diagnosis of COPD?

  1. Reduced diffusing capacity on lung volumes
  2. Presence of chronic productive cough for three months
  3. Hyperinflation with increased residual volume
  4. Post-bronchodilator FEV1/FVC below 0.70 Correct answer.

Explanation

COPD is confirmed by a post-bronchodilator FEV1/FVC ratio below 0.70, which demonstrates persistent airflow obstruction. Symptoms such as chronic cough are supportive but not diagnostic, and other lung function abnormalities may occur in different diseases.

Question 42DPOC

Which inhaled medication class is the foundation of maintenance therapy for symptomatic COPD because it improves symptoms and reduces exacerbations?

  1. Short-acting beta2-agonists taken regularly
  2. Inhaled corticosteroids used as monotherapy
  3. Long-acting beta2-agonists and long-acting muscarinic antagonists Correct answer.
  4. Oral theophylline as first-line therapy

Explanation

Long-acting bronchodilators, either a LAMA or LABA, are the cornerstone of maintenance treatment in COPD and improve symptoms while lowering exacerbation frequency. Inhaled corticosteroids are not used alone, and short-acting agents are for rescue rather than maintenance.

Question 43DPOC

A patient with COPD asks why smoking cessation matters. Which statement best reflects the expected benefit?

  1. It slows the accelerated decline in lung function and reduces mortality Correct answer.
  2. It normalizes the FEV1/FVC ratio within weeks
  3. It eliminates the need for bronchodilators in most patients
  4. It reverses established emphysema on imaging

Explanation

Smoking cessation is the single most effective intervention to slow the accelerated loss of lung function and to reduce mortality in COPD. Structural emphysema and the obstructive ratio are generally not reversed, and many patients still require bronchodilators.

Question 44DPOC

Which finding on arterial blood gas indicates chronic respiratory acidosis with metabolic compensation in a patient with severe COPD?

  1. Elevated PaCO2 with elevated bicarbonate and near-normal pH Correct answer.
  2. Low PaCO2 with normal bicarbonate and high pH
  3. Normal PaCO2 with low bicarbonate and high pH
  4. Elevated PaCO2 with low bicarbonate and low pH

Explanation

Chronic hypercapnia is offset by renal bicarbonate retention, so pH returns toward normal despite an elevated PaCO2. An acute rise in CO2 without bicarbonate compensation produces an acidemic pH.

Question 45DPOC

A patient with COPD has had two moderate exacerbations in the past year and an FEV1 of 45% predicted. Which maintenance regimen is most appropriate?

  1. A short-acting beta2-agonist alone
  2. An inhaled corticosteroid alone
  3. A LABA plus a LAMA Correct answer.
  4. An oral beta2-agonist alone

Explanation

Dual long-acting bronchodilator therapy with a LABA and LAMA is recommended for patients with frequent exacerbations and significant airflow limitation. Monotherapy with short-acting or oral agents does not provide adequate maintenance control.

Question 46DPOC

Which intervention has been shown to improve survival in patients with chronic hypoxemic COPD?

  1. Routine inhaled corticosteroid therapy
  2. Prophylactic antibiotics throughout the year
  3. Long-term oxygen therapy for at least 15 hours per day Correct answer.
  4. Regular use of oral corticosteroids

Explanation

Long-term oxygen therapy improves survival in COPD patients with chronic severe hypoxemia when used for at least 15 hours daily. The other options may reduce exacerbations or symptoms but have not demonstrated a mortality benefit.

Question 47DPOC

Which feature most strongly suggests that a patient's airflow obstruction is due to COPD rather than asthma?

  1. Childhood onset with allergic rhinitis
  2. Episodic symptoms with complete resolution between attacks
  3. Onset in midlife with persistent obstruction and a heavy smoking history Correct answer.
  4. Marked blood eosinophilia with seasonal variation

Explanation

COPD typically presents in midlife or later with persistent, largely irreversible obstruction and a significant smoking exposure. Asthma more often begins in childhood, is episodic, and shows variable reversibility.

Question 48DPOC

A patient with COPD on a LABA and LAMA continues to have exacerbations and has a blood eosinophil count of 350 cells/µL. What is the most appropriate next step?

  1. Switch to a short-acting bronchodilator only
  2. Stop the LAMA and start oral corticosteroids
  3. Add an inhaled corticosteroid to the bronchodilator regimen Correct answer.
  4. Start chronic oral antibiotics

Explanation

Adding an inhaled corticosteroid is appropriate for patients with persistent exacerbations and elevated eosinophil counts despite dual bronchodilation. Oral corticosteroids are reserved for exacerbations, and stepping down bronchodilators would worsen control.

Question 49DPOC

Which non-pharmacologic intervention improves dyspnea and exercise capacity in COPD by strengthening inspiratory muscles?

  1. Supplemental oxygen during sleep only
  2. Nebulized saline therapy
  3. Inspiratory muscle training Correct answer.
  4. Routine chest physiotherapy

Explanation

Inspiratory muscle training strengthens the diaphragm and accessory muscles, reducing dyspnea and improving exercise tolerance in selected patients. The other options do not target respiratory muscle strength.

Question 50DPOC

What is the primary benefit of pulmonary rehabilitation in COPD?

  1. Reversal of airflow obstruction on spirometry
  2. Elimination of the need for bronchodilators
  3. Cure of emphysema
  4. Improved dyspnea, exercise capacity, and quality of life Correct answer.

Explanation

Pulmonary rehabilitation improves dyspnea, exercise tolerance, and health-related quality of life, and it reduces hospitalizations. It does not change the underlying obstruction or cure emphysema.