Pulmonary · PANCE / PANRE

Bronchiectasis

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Permanent abnormal dilation of bronchi with chronic infection and inflammation.

Also known as: bronchiectasis, chronic suppurative lung disease, tram-tracking

Overview

Irreversible dilation and thickening of medium-sized bronchi resulting from chronic inflammation and recurrent infection, producing chronic productive cough, recurrent exacerbations, and progressive lung damage.

Epidemiology

Underdiagnosed but increasingly recognized — prevalence ~50-500 per 100,000 in the US. More common in older women and those with prior respiratory infection or underlying lung disease. Cystic fibrosis is a major cause in younger patients.

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Question 1PulmonaryEasy
A 24-year-old woman with cystic fibrosis (CF) has chronic cough, copious purulent sputum, and recurrent infections. HRCT shows airway dilation greater than the accompanying artery, lack of bronchial tapering, and mucus plugging. Which underlying mechanism best explains these structural findings?
  • ADefective ciliary dynein arms impairing mucociliary transport
  • BAirway smooth muscle hypertrophy with subepithelial fibrosis
  • CSelf-perpetuating cycle of poor clearance, infection, inflammation
  • DNeutrophil elastase excess driving airway wall destruction
Reveal answer & full explanation
Correct answer: C — Self-perpetuating cycle of poor clearance, infection, inflammation
  • ADefective ciliary dynein arms impairing mucociliary transport
  • BAirway smooth muscle hypertrophy with subepithelial fibrosis
  • CSelf-perpetuating cycle of poor clearance, infection, inflammation✓
  • DNeutrophil elastase excess driving airway wall destruction

Why C) Self-perpetuating cycle of poor clearance, infection, inflammation is correct

  • Bronchiectasis is permanent abnormal dilation of the bronchi caused by a self-perpetuating cycle (Cole's vicious cycle): an initial airway insult impairs mucociliary clearance, predisposing to bacterial colonization and chronic infection, which provokes neutrophilic inflammation and proteolytic enzyme (neutrophil elastase) release, causing further airway wall destruction and dilation

Why the others are wrong

  • A) Defective ciliary dynein arms impairing mucociliary transport — dynein arm defects are the mechanism of primary ciliary dyskinesia; in cystic fibrosis (CF) the clearance defect comes from CFTR-mediated airway surface liquid dehydration with thick tenacious secretions, and the cilia themselves are structurally normal
  • B) Airway smooth muscle hypertrophy with subepithelial fibrosis — this describes asthmatic airway remodeling, which produces largely reversible airflow obstruction rather than the permanent bronchial dilation and mucus plugging on this HRCT
  • D) Neutrophil elastase excess driving airway wall destruction — elastase proteolysis is a downstream step inside the vicious cycle rather than the underlying defect, and alone it cannot explain the impaired clearance and chronic infection that drive this patient's mucus plugging

Additional high-yield points

  • Common causes of bronchiectasis include cystic fibrosis (CF), primary ciliary dyskinesia, post-infectious damage, allergic bronchopulmonary aspergillosis (ABPA), and immunodeficiencies
  • High-resolution CT (HRCT) findings: signet-ring sign (airway-to-artery ratio >1), lack of tapering, and visible peripheral airways are characteristic
Question 2PulmonaryMedium
A 42-year-old woman has years of daily cough with large amounts of purulent sputum and recurrent pneumonias. High-resolution CT shows dilated bronchi with thickened airway walls. Which of the following is the most likely diagnosis?
  • AIdiopathic pulmonary fibrosis
  • BBronchiectasis from infection
  • CLung abscess with cavitation
  • DChronic obstructive bronchitis
Reveal answer & full explanation
Correct answer: B — Bronchiectasis from infection
  • AIdiopathic pulmonary fibrosis
  • BBronchiectasis from infection✓
  • CLung abscess with cavitation
  • DChronic obstructive bronchitis

Why Bronchiectasis from infection is correct

  • Years of copious purulent sputum with recurrent pneumonias plus HRCT showing permanently dilated, thick-walled bronchi is bronchiectasis.
  • The irreversibly dilated airways trap mucus and cripple mucociliary clearance, setting up a vicious cycle of colonization and reinfection.
  • The CT finding (signet-ring/tram-track airways larger than the accompanying vessel) is diagnostic.

Why the others are wrong

  • Idiopathic pulmonary fibrosis — IPF causes a progressive dry cough with basilar reticulation and honeycombing, not purulent sputum and dilated bronchi; this is the wrong-CT-pattern trap.
  • Chronic obstructive bronchitis — Chronic bronchitis produces sputum but does not create the fixed bronchial dilation seen on CT; missing that structural finding is the symptom-overlap trap.
  • Lung abscess with cavitation — An abscess is a focal, subacute cavity with an air-fluid level in one segment, not years of daily sputum with diffusely dilated, thick-walled airways on HRCT.
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Risk factors

  • Post-infectious: severe pneumonia (pertussis, measles, adenovirus, TB, NTM)
  • Cystic fibrosis (CFTR mutations)
  • Primary ciliary dyskinesia (Kartagener: situs inversus + bronchiectasis + sinusitis)
  • Immunodeficiency (CVID, hypogammaglobulinemia, HIV)
  • Allergic bronchopulmonary aspergillosis (ABPA)
  • Chronic aspiration, GERD
  • Connective tissue disease: rheumatoid arthritis, Sjögren
  • Inflammatory bowel disease, alpha-1 antitrypsin deficiency
  • Mounier-Kuhn (tracheobronchomegaly), Williams-Campbell (cartilage deficiency)

Pathophysiology

Vicious cycle of impaired mucociliary clearance, chronic bacterial colonization (Pseudomonas, H. influenzae, S. aureus, Moraxella, NTM), neutrophilic inflammation, and bronchial wall destruction. Permanent bronchial dilation, fibrosis, and loss of elastic recoil follow.

Clinical presentation

Symptoms

  • Chronic productive cough with copious mucopurulent sputum (often daily, worse in morning)
  • Recurrent respiratory infections / exacerbations
  • Dyspnea, wheezing, fatigue
  • Hemoptysis (variable; ranges from blood-streaked sputum to massive)
  • Pleuritic chest pain during exacerbations

Signs / physical exam

  • Coarse crackles (often persistent), wheezes, rhonchi
  • Clubbing in advanced disease
  • Cyanosis, signs of cor pulmonale if severe

Differential diagnosis

  • COPD — Smoking history, obstructive PFTs, hyperinflation; less mucopurulent sputum; can coexist
  • Asthma — Reversible airflow obstruction, atopic features; can coexist (especially with ABPA)
  • Cystic fibrosis — Younger onset, pancreatic insufficiency, infertility, elevated sweat chloride
  • Tuberculosis — Apical cavitary disease; positive AFB/IGRA; can cause post-infectious bronchiectasis
  • Non-tuberculous mycobacterial disease — 'Lady Windermere' — older women with right middle lobe/lingula bronchiectasis and nodules; M. avium complex
  • Chronic eosinophilic pneumonia / EGPA — Peripheral eosinophilia, asthma overlap
  • Recurrent aspiration — Posterior or dependent segments; underlying neurologic or esophageal disorder

Diagnostic workup

Labs

  • Sputum culture (bacterial, mycobacterial, fungal) — Pseudomonas isolation predicts severity
  • CBC, immunoglobulins (IgG, IgA, IgM, IgE), HIV
  • Sweat chloride test and/or CFTR gene panel if CF suspected
  • Aspergillus-specific IgE and total IgE for ABPA
  • Alpha-1 antitrypsin level
  • Autoimmune panel (RF, ANA) if CTD suspected

Imaging

  • High-resolution CT chest is the diagnostic gold standard — findings: bronchial dilation (signet-ring sign, internal lumen larger than adjacent artery), bronchial wall thickening, tram-track opacities, mucus plugging, varicose or cystic bronchi
  • CXR: tram tracks, ring shadows; less sensitive than HRCT

Other studies

  • Spirometry — usually obstructive pattern; assess severity and trajectory
  • Sweat chloride / CFTR testing in patients <40 or with suggestive features
  • Ciliary studies (nasal nitric oxide, ciliary biopsy) if PCD suspected
  • Bronchoscopy if foreign body, focal bronchiectasis, or atypical infection suspected

Diagnostic algorithm

HRCT FeatureDescription
Signet-ring signInternal bronchial diameter exceeds adjacent pulmonary artery diameter
Tram-track linesParallel linear opacities from thickened bronchial walls running peripherally
Cystic / varicose bronchiSaccular dilations with or without air-fluid levels (severe disease)
Lack of bronchial taperingBronchi maintain caliber within 1 cm of pleura
Mucus pluggingTree-in-bud or 'finger-in-glove' opacities
HRCT findings diagnostic of bronchiectasis.

Treatment

First-line

  • Airway clearance — cornerstone of therapy: chest physiotherapy, oscillating PEP devices (Acapella, Flutter), high-frequency chest wall oscillation vest, active cycle of breathing
  • Nebulized mucolytics/hydration: hypertonic saline (3-7%) inhalation; dornase alfa for CF only (may worsen non-CF bronchiectasis)
  • Inhaled bronchodilator (albuterol) prior to airway clearance to ease maneuvers
  • Treat exacerbations with prolonged antibiotics (10-14 days), targeted to prior sputum cultures: amoxicillin-clavulanate, doxycycline; ciprofloxacin if Pseudomonas
  • Vaccinations: annual influenza, pneumococcal, COVID-19, RSV (age ≥60), Tdap
  • Smoking cessation; pulmonary rehabilitation

Second-line / adjunct

  • Chronic macrolide therapy (azithromycin 250-500 mg 3×/week) — reduces exacerbations (EMBRACE, BAT, BLESS trials); screen for QT prolongation and NTM before starting
  • Inhaled antibiotics for chronic Pseudomonas: tobramycin, aztreonam, colistin (off-label in non-CF)
  • Treat underlying cause: ABPA — itraconazole + steroids; CVID — IVIG; NTM — multidrug regimen; alpha-1 — augmentation
  • Surgical resection (lobectomy) for focal disease with massive hemoptysis or refractory infection
  • Bronchial artery embolization for life-threatening hemoptysis
  • Lung transplantation for end-stage disease

Complications

  • Recurrent exacerbations with progressive lung function decline
  • Massive hemoptysis (bronchial artery hypertrophy)
  • Chronic infection: Pseudomonas, NTM, Aspergillus colonization
  • Cor pulmonale, respiratory failure
  • Amyloidosis (chronic inflammation, rare)

PANCE pearls

  • HRCT signet-ring sign — bronchial lumen larger than adjacent pulmonary artery — is the imaging hallmark of bronchiectasis.
  • Always look for a reversible cause: CF testing in younger patients, immunoglobulins, alpha-1 level, ABPA workup, NTM, HIV.
  • Pseudomonas isolation predicts more rapid lung function decline and worse prognosis; consider chronic inhaled antibiotic.
  • Rule out NTM infection BEFORE starting chronic azithromycin — monotherapy in NTM-positive patients selects resistance.
  • Sweat chloride ≥60 mmol/L is diagnostic of CF; 30-59 mmol/L intermediate (genetic testing needed); <30 mmol/L unlikely.

References

  • BTS 2019 — British Thoracic Society Guideline for Bronchiectasis in Adults (Hill et al., Thorax 2019)
  • ERS 2017 — European Respiratory Society Guidelines for the Management of Adult Bronchiectasis (Polverino et al., Eur Respir J 2017)
  • EMBRACE Trial — Azithromycin for Prevention of Exacerbations in Non-CF Bronchiectasis (Wong et al., Lancet 2012)
  • BLESS Trial — Long-term Erythromycin for Bronchiectasis (Serisier et al., JAMA 2013)

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