Resp Flashcards
What is COPD?
A common progressive disorder characterised by airway obstruction with little or no reversibility
What is chronic bronchitis?
Cough and sputum production on most days for 3 months of 2 successive years, improves with smoking cessation
What is emphysema?
Enlarged air spaces distal to terminal bronchioles, with destruction of alveolar walls
Epidemiology of COPD
Male, >35yrs
Risk factors for COPD
Smoking, occupational dust and chemicals, environmental tobacco smoke (ETS), indoor and outdoor air pollution, genes, infection, socio-economic status
Pathophysiology of chronic bronchitis
o Blue bloaters
o Bronchial wall inflammation and mucosal oedema ->
airways narrow -> body increases perfusion (CO) ->
V/Q mismatch -> hypoxia (blue)
o Obstruction -> increasing residual lung volume ->
bloating
Pathophysiology of emphysema
o Pink puffers
o Destruction of lung tissue distal to terminal
bronchioles -> loss of elastic recoil -> air trapping
o Damage to capillary bed -> inability to oxygenate ->
hyperventilation (puffing)
Signs of COPD
o Raised respiratory rate
o Hyperexpansion/barrel chest
o Cyanosis
o ‘Cor pulmonae’ – HF, oedema
Symptoms of COPD
o SOB
o Cough, phlegm
o Wheeze
o Weight loss
Investigations for suspected COPD
• Lung function tests – reduced FEV1/FVC, reduced
PEFR, raised TLC, obstructive pattern
• FBC – PCV increased
• CXR – hyperinflation, flat hemidiaphragms, large
central pulmonary arteries
• ECG – RA and RV hypertrophy
• ABG – PaO2 decreased ± hypercapnia
• CT – emphysema
Differentials for COPD
Pneumonia, heart failure, pulmonary embolus, lung cancer, asthma
Lifestyle management of COPD
Smoking cessation, regular physical activity encouraged
1st line drug treament for COPD
SABA/SAMA
2nd line drug treatment for COPD
LABA/LAMA
3rd line drug treatment for COPD
LABA/LAMA + corticosteroid
4th line drug treatment for COPD
LABA + LAMA + corticosteroid
5th line drug treatment for COPD
Long term oxygen therapy -> sats of 88-92%
Surgical management of COPD
Lung transplant if drugs insufficient
What is asthma?
Reversible obstruction of the airways, bronchospasm and excessive airway secretions, usually a hypersensitivity type 1 reaction
What is extrinsic asthma?
Asthma triggered by an allergen (dust, foods, animals, pollens) type 1 hypersensitivity, IgE mediated
What type of hypersensitivity is occupational asthma?
Type 1
What is intrinsic asthma?
Not immune-mediated, non-allergic, triggered by; cold, infection, stress, exercise, SO2, pollutants etc.
What are the 3 factors that contribute to airways narrowing in asthma?
o Bronchial muscle contraction
o Mucosal swelling/inflammation
o Increased mucus production
What causes mucosal swelling/inflammation in asthma?
Mast cell and basophil degranulation -> release of leukotrienes and prostaglandins
What are the two main phenotypes of asthma?
Eosinophillic and non-eosinophillic
Features of asthma
• Episodic cough, breathlessness
• Diurnal variation – worse at night
• Provoking factors – allergens, infections, menstrual
cycle, exercise, cold air, laughter/emotion
• Other atopic disease – eczema, hayfever
Signs of asthma
- Tachypnoea
- Audible wheeze
- Hyperinflated chest
Investigations for suspected asthma
- Spirometry – FEV1/FVC <70% + reversibility testing
- PEF- keep diary
- Sputum and blood culture, ABG, CXR
Differentials for asthma
Pulmonary oedema, COPD, tumour
Step 1 drug treament for asthma
SABA (salbutamol) PRN – max once daily
Step 2 drug treament for asthma
+ inhaled corticosteroid (beclomethasone) once daily
Step 3 drug treatment for asthma
+ leukotriene receptor antagonist (LTRA)
Step 4 drug treatment for asthma
+ LABA (salmeterol inhaler 12 hourly) ± LTRA
Step 5 drug treatment for asthma
+ oral prednisolone
Epidemiology of lung cancer
- M:F, 2:1
* 1/3 of all cancer deaths
Causes of lung cancer
- Cigarettes
- Occupational – asbestos etc.
- Lung fibrosis
Signs and symptoms of lung cancer
- Cough
- Recurrent chest infections
- Haemoptysis
- Increasing SOB
- Extra-pulmonary changes
- Malaise
- Weight loss
Investigations for suspected lung cancer
o Sputum sample
o BAL
o Biopsy
o Lobectomy, wedge, pneumonectomy
What is the most common type of lung cancer?
Non-small cell lung carcinoma
What is the main treatment for small cell lung carcinoma?
Chemotherapy
At what stage does lung cancer usually present?
Late stage, metastases
What are the main treatments used for non-small cell lung carcinoma?
Radiotherapy and surgery
Symptoms of pulmonary embolism
Breathlessness, pleuritic chest pain, DVT signs/symptoms, RF’s
Risk factors for pulmonary embolism
- Surgery, immobility
- OC pill, HRT, Pregnancy
- Long haul flights/ travel (rare)
- Inherited thrombophilia - genetic predisposition
Signs of pulmonary embolism
Tachycardia, tachypnoea, pleural rub, none of alternative diagnosis
Investigations for suspected pulmonary embolism
o CXR usually normal o ECG – sinus tachycardia o Blood gases – type 1 respiratory failure o D-dimer o CTPA spiral CT with contrast
Management of PE
- LMW Heparin for min 5 days
* Oral warfarin (INR 2-3) for 6 months
Prevention of PE
Compression stockings, hydration and early mobilisation
Causes of adult respiratory distress syndrome (ARDS)
Shock, trauma, infections, gas inhalation (NO2 etc.), narcotic abuse
Pathology of ARDS
Lung damage and release of inflammatory mediators -> increased capillary permeability -> non-cardiogenic pulmonary oedema, alveolar infiltrate + hyaline membranes -> multiorgan failure
Signs and symptoms of ARDS
Acute onset, SOB, tachypnoea, tachycardia, peripheral vasodilation, bilateral inspiratory crackles, hypoxaemia -> cyanosis
Investigations for suspected ARDS
o Bloods – FBC, U&E, LFT, CRP, cultures, ABG
o CXR – bilateral pulmonary infiltrates
o Pulmonary artery catheter – measure pulmonary capillary wedge pressure <19mmHg
Management of ARDS
Admit to ITU, supportive therapy, treat underlying cause
What is fibrosing alveolitis (Idiopathic Pulmonary Fibrosis)?
Fibrosis of lung interstitium causing restrictive respiratory defect, cause unknown
Symptoms of pulmonary fibrosis
Breathlessness, respiratory failure -> cor pulmonae
Signs of pulmonary fibrosis
Finger clubbing, inspiratory basal crackles
Investigations for suspected pulmonary fibrosis
o CXR – ground glass -> honeycomb lung
o HRCT – most sensitive
o ABG – hypoxia
o Spirometry – FEV1/FVC ratio normal, FVC low
Management of pulmonary fibrosis
o Prednisolone
o Lung transplant
What is sarcoidosis?
Autoimmune granulomatous disease, wide-spread but mainly affecting the lungs
Epidemiology of sarcodosis
young Afro-American women
Cause of sarcoidosis
Mostly unknown, genetic link, autoimmune
Signs and symptoms of sarcoidosis
o General – fever, weight loss, fatigue
o Pulmonary – dry cough, dyspnoea
o Other – lymphadenopathy, hepatosplenomegaly,
conjunctivitis, glaucoma, erythema nodosum etc.
Investigations for suspected sarcoidosis
o CXR – bilateral hilar lymphadenopathy
o Bloods – high ESR, high ACE, high calcium
o Lung function tests – normal or restrictive
o Tissue biopsy – diagnostic
o Kveim test
Management of sarcoidosis
o Minimal symptoms – resolve spontaneously within
few weeks, remission in few years
o Severe symptoms – prednisolone
o Lung transplantation
What is bronchiectasis?
Permanent dilatation of bronchi and bronchioles due to obstruction or severe inflammation
Pathophysiology of bronchiectasis
- Chronic inflammation of airways -> irreversible damage -> bronchioles scarred + dilated, cilia lost
- Permanent dilatation impairs muco-ciliary clearance -> mucus builds up
Causes of bronchiectasis
- Post-infection – H. influenzae, Strep. Pneumoniae
- Congenital – CF, primary ciliary dyskinesia
- Bronchial obstruction
Symptoms of bronchiectasis
- Persistent cough with foul-smelling sputum
- Haemoptysis
- Dyspnoea