BRONCHIECTASIS

✓ Medically ReviewedDISEASEID: MDBT0065🚨 TRIAGE: ROUTINEICD-10: J47

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Definition

CLINICAL DEFINITION

Bronchiectasis is permanent abnormal dilation (widening) of bronchi (large airways). It impairs mucociliary clearance (natural mucus clearing). Retained mucus drives chronic bacterial infection (persistent germ growth) and neutrophilic inflammation (white cell injury). Repeated cycles cause progressive wall damage (structural breakdown) and airflow obstruction (limited breathing).

IN PLAIN ENGLISH

Airways are widened and scarred and cannot clear phlegm well. Stuck phlegm causes daily cough with lots of mucus. Chest infections keep coming back and cause damage. Daily clearance and quick infection care slow the harm.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Bronchiectasis is not transient dilation (temporary widening) from acute infection alone. It is not bronchiolitis (small airway inflammation) or emphysema (air sac destruction) alone. It is not asthma (reversible narrowing) alone, though overlap can occur. Diagnosis needs lasting imaging change plus matching symptoms.

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Word Breakdown

bronch-

=bronchus or airway tube

-ectasis

=dilation or expansion

Literal Meaning: dilation of the bronchi

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Abbreviations

HRCT=High-resolution CT - detailed lung scan confirming dilated airways

BSI=Bronchiectasis severity index - score predicting admissions and death risk

CF=Cystic fibrosis - inherited mucus disorder causing early bronchiectasis

NTM=Nontuberculous mycobacteria - environmental germs infecting damaged airways

ABPA=Allergic bronchopulmonary aspergillosis - mould allergy damaging central airways

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Synonyms & Variants

Bronchiectatic disease›Bronchial dilatation disorder›Non-cystic fibrosis bronchiectasis›

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Category-Specific Context

Bronchiectasis is a Disease because it is lasting structural damage with causes and course. It sits under bronchial disorders (airway diseases) within chronic respiratory disorders. It causes symptoms (patient complaints) such as cough and signs (exam findings) such as crackles. Care targets clearance, infection and complications.

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Clinical Context & Usage

CLINICAL SETTINGS

Primary CareRespiratory ClinicEmergency DepartmentPhysiotherapy and Pulmonary RehabilitationIntensive Care for Massive Bleeding or Failure

USAGE & DOCUMENTATION NOTES

Use bronchiectasis only after HRCT (detailed scan) confirms permanent dilation. State subtype such as cystic fibrosis related or non-cystic fibrosis. Record exacerbation (flare-up) status, sputum germs and lung function trend. Do not use it for acute bronchitis (short airway infection) alone.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Bronchiectasis follows Cole vicious cycle (self-reinforcing loop) of poor clearance, infection and inflammation. Damaged cilia (hair-like movers) and thick mucus cut clearance. Bacterial enzymes and neutrophil elastase (white cell enzyme) destroy elastin (wall protein) and cartilage (support tissue). Weak walls dilate irreversibly (permanently widen) and pool mucus. Pooling sustains biofilms (germ layers) and triggers flare-ups with further injury.

PRIMARY CAUSES

Post-infective injury after severe pneumonia, tuberculosis, measles or pertussis

Severe infection destroys wall support and impairs clearing, starting a cycle of infection and dilation

Cystic fibrosis from CFTR dysfunction (salt transport defect)

Faulty salt transport dehydrates mucus and blocks clearing, causing chronic infection and wall breakdown

Primary ciliary dyskinesia (inborn cilia movement defect)

Genetic cilia failure prevents mucus propulsion, causing retention, infection and dilation

Immunodeficiency including common variable immunodeficiency

Low antibody output allows recurrent bacterial infection that injures walls and remodels airways

Allergic bronchopulmonary aspergillosis

Mould allergy triggers inflammation and mucus plugging that damages central airways

COPD overlap with chronic bronchitis

Chronic bronchitis impairs clearing and promotes germ colonisation with dilated remodelling

Nontuberculous mycobacterial infection

Persistent mycobacteria drive granulomatous (lumpy immune) inflammation with wall destruction

Systemic disease such as rheumatoid arthritis and Sjogren syndrome

Systemic immune dysregulation causes small airway inflammation with recurrent infection

Focal obstruction from foreign body, tumour or nodes

Blocked segment traps mucus beyond the block, causing post-obstructive infection and local dilation

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Epidemiology

Prevalence:Bronchiectasis is increasingly recognised with wider HRCT (detailed scan) use. It is uncommon in the community but common in respiratory clinics. Frequency rises with age and past tuberculosis (lung germ infection) burden. Nontuberculous mycobacterial (environmental germ) disease is rising in many regions.

Age Group:Any age can be affected across causes. Cystic fibrosis related disease presents in childhood or teens. Non-cystic fibrosis disease usually presents in middle to older adulthood. Traction dilation (pulled open airways) from fibrosis (scarring) is mainly an older adult finding.

Geographic Distribution:Bronchiectasis occurs worldwide in all regions. Post-infective disease tracks past tuberculosis and severe pneumonia burden. Mould allergy forms track asthma testing access. Reported patterns reflect scan access and testing differences.

Red Flags & Triage ★

TRIAGE LEVEL

🚨 ROUTINE

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Massive haemoptysis needing embolisation or surgery
Undiagnosed cystic fibrosis in young adults
Primary ciliary dyskinesia with situs inversus and infertility
Immunodeficiency needing replacement therapy
Mould allergy needing steroids and antifungals
Nontuberculous mycobacterial infection needing prolonged therapy
Chronic Pseudomonas driving decline

URGENT EVALUATION TRIGGERS

Massive bleeding with breathlessness
Severe breathlessness with low oxygen or chest pain
Fever with fast heart and low pressure suggesting sepsis
Confusion with breathing failure
Flare-up not responding to oral therapy
Sudden pleuritic pain suggesting collapsed lung

Contraindications & Precautions

CONTRAINDICATIONS

Do not label transient widening in acute infection as bronchiectasis
Do not use prolonged antibiotics without sputum guidance and review
Do not delay bleeding workup when haemoptysis recurs

SPECIAL PRECAUTIONS

Avoid smoking and vaping irritants
Keep influenza and pneumococcal vaccines current where advised
Use daily airway clearance even when well
Seek prompt review for flare-up signs

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Acute exacerbation with more cough and sputum
Chronic Pseudomonas colonisation (persistent germ presence)
Haemoptysis (coughing blood)
Respiratory failure with low oxygen
Cor pulmonale (right heart strain)
Lung abscess (pus collection)
Empyema (chest cavity infection)
Weight loss with deconditioning

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Bronchitis

Shares bronch prefix and cough but is airway inflammation without permanent dilation

Bronchiolitis

Shares stem and wheeze but is small airway inflammation, not large airway dilation

Bronchospasm

Shares bronch prefix and breathlessness but is transient muscle tightening, not fixed dilation

CLINICAL DIFFERENTIAL DIAGNOSES (DDx)

COPD

Key Distinguishing Feature: Smoking-related obstruction without signet-ring dilation (dilated airway marker) on scan

Asthma

Key Distinguishing Feature: Reversible obstruction with normal imaging between attacks and no permanent dilation

Cystic fibrosis

Key Distinguishing Feature: Positive sweat chloride or CFTR genetics with early onset and upper lobe disease

Allergic bronchopulmonary aspergillosis

Key Distinguishing Feature: Central dilation with fleeting shadows, high IgE (allergy antibody) and Aspergillus sensitisation

Pulmonary tuberculosis

Key Distinguishing Feature: Upper lobe cavitation with granulomas and germ proof, not diffuse signet-ring pattern

Traction bronchiectasis from fibrosis

Key Distinguishing Feature: Net-like scarring pulls airways open rather than primary infection driving dilation

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Clinical Pearls

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Send sputum for bacterial and mycobacterial culture before antibiotics at baseline and flare-up. Chronic Pseudomonas (persistent germ) changes therapy and outlook.

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Use daily huff cough (forced breath technique) with oscillatory PEP (vibration pressure device) plus exercise. Double frequency during flare-ups, not only when unwell.

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Track sputum volume and colour change as the earliest flare-up signal. More volume or yellow-green colour beats fever as an early marker.

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Test new or atypical disease for mould allergy, immunodeficiency, cystic fibrosis and NTM (environmental germs). Treatable traits hide in these results.

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Start exacerbation antibiotics early per protocol with vaccines and rehab alongside. Stopping smoking and updating vaccines cuts admission risk.

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Example Usage & SOAP

CLINICAL SENTENCE

""64-year-old woman with daily purulent sputum shows signet-ring airways from bronchiectasis.""

IN A SOAP NOTE

S: 62-year-old woman with known bronchiectasis reports 4 days worse cough, green sputum and effort breathlessness. No heavy bleeding or chest pain. O: Temp 37.9C, BP 132/78, HR 94, RR 20, SpO2 94 percent on air, coarse crackles left base. A: Bronchiectasis flare-up with suspected bacterial infection. P: Sputum culture, exacerbation antibiotics per protocol, intensified clearance, review in 48 to 72 hours.

DIFFERENTIAL DIAGNOSIS CONTEXT

Daily purulent sputum (infected phlegm) with coarse crackles favours bronchiectasis over COPD (smoking lung disease). Signet-ring sign (dilated airway marker) on HRCT (detailed scan) confirms it. Smoking-related obstruction without dilation favours COPD. Consider overlap when obstruction persists despite clearance.

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Classifications & Scoring

GRADING SYSTEM

Bronchiectasis Severity Index (BSI)

Multicomponent tool using age, body mass, flare-ups, breathlessness, germs and imaging. Stratifies risk for flare-ups, admission and death. Guides monitoring and referral.

STAGING SCALE

FACED Score

Five-variable score using breathing test, age, colonisation, imaging extent and breathlessness. Predicts 5-year death and classes mild to severe disease for clinic use.

SCORING TOOL

E-FACED Score

Extended FACED adding flare-ups and admissions to base variables. Improves prediction of future flare-ups and admissions for follow-up planning.

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Prognosis

SHORT-TERM OUTCOME

Course is often stable between flare-ups. Flare-ups bring more cough, sputum volume or colour change and breathlessness. Most flare-ups improve with prompt antibiotics (germ drugs) and intensified clearance. Heavy bleeding or sepsis (blood infection) needs urgent care.

LONG-TERM PROGNOSIS

Course spans mild to progressive decline. Frequent flare-ups, chronic Pseudomonas (persistent germ) and low lung function predict faster decline. Complications include breathing failure and right heart strain. Vaccines, clearance and monitoring improve outcomes.

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References & Coding

ICD-10 DIAGNOSTIC CODE

J47

LITERATURE CITATIONS & GUIDELINES

[1]British Thoracic Society Guideline for bronchiectasis in adults 2019

[2]European Respiratory Society Guidelines for bronchiectasis in adults 2017

[3]Harrison's Principles of Internal Medicine

MEDICAL DISCLAIMER — This content is intended for educational purposes and qualified healthcare professionals only. Always refer to current clinical diagnostic criteria, institutional protocols, and official guidelines. Medobo is not responsible for clinical decisions made based on this content.