Respiratory Flashcards
Outline the MRC dyspnoea scale
1) Not troubled by SoB (except on strenous exercise)
2) SoB when hurrying or going up slight hill
3) Walks slower than contempories on flat/has to stop for breath
4) Stops for breath approx 100m or after a few minutes
5) Too SoB to leave house or SoB on dressing
Respiratory Causes of Clubbing
ABCDEF
A - Asbestosis & Abscess
B - Bronchiectasis & tB
C - CF
D - “Dirty” tumours e.g. mesothelioma
E - Empyema
F - Fibrosing Alveolitis (IPF)
Features of Life-Threatening Asthma
PEFR<33%
Silent chest
Poor respiratory effort
Bradycardia, hypotension
Arrhythmia
Exhaustion
Confusion/Coma
What is COPD?
Chronic obstructive airways disease
Limited reversibility
Combination of bronchitis and emphysema
Abnormal inflammatory response in airways leads to mucus hypersecretion and chronic tissue destruction –> remodelling –> fibrosis –> increased airway resistance
Commonest cause = cigarette smoking
Also consider alpha 1 antitrypsin deficiency and occupation (e.g. coal mining)
Clinical Features of COPD
Look around bedside for inhalers
?LTOT
Cachexic? Cushingoid appearance?
Pursed lip breathing
Use of accessory muscles
Bounding pulse
CO retention flap (asterixis)
Hyperinflated chest
Hyperresonance to percussion
Expiratory wheeze
?coarse crepitations
Can you name any severity indexes used for COPD?
MRC dyspnoea scale
Gold Staging for Airflow obstruction
- FEV1/FVC < 0.7, FEV1 <80%
BODE index
- FEV1
- 6 minute walk distance
- BMI
- MRC dyspnoea scale
How would you investigate someone in whom you suspect they have COPD?
Spirometry with reversibility testing
- FEV1/FVC < 0.7
- FEV1 < 0.8
- Minimal reversibility with bronchodilators
ECG
Bloods
- Routine including FBC (?polycythaemia), inflammatory markers, U&Es, LFTs (albumin may be low in chronic disease)
- ABG if ongoing oxygen requirement
- alpha1AT levels if young/FHx/minimal smoking history
CXR
- ?hyperinflation ?bullae ?flattened hemidiaphragm
HRCT
- Useful to grade and classify emphysema
Echocardiogram
- ?pulm HTN
Describe some key differences between COPD and Asthma
1) COPD more likely in smokers/ex-smokers
2) Asthma = diurnal pattern
- Serial peak flow measurements will show >20% diurnal variation
3) Asthma = history of triggers, history of atopy
4) Asthma = evidence of reversibility on spirometry with bronchodilators (>400mL improvement)
What are common causes of COPD exacerbations?
Infection (60%)
- Viruses e.g. influenza, parainfluenza, rhinovirus
- Bacteria e.g. haemophilus influenzae, streptococcus pneumoniae, pseudomonas
Environmental pollution
Unknown (30%)
Outline the management of COPD
O PARISIAN
Oxygen therapy
- To slow rate of progression to cor pulmonale
Pulmonary Rehab
= MDT programme of physio, nutrition team, education and behavioural intervention
- Indicated if MRC<3
Azithromycin
- Anti-inflammatory rather than long term antibiotic
- Reduce rate of exacerbations
- Indicated if >3 exacs requiring steroids or 1 exac requiring hospitalisation / year
Reduction of Lung volume (surgery)
Inhalers
- SABA/LABA +/- ICS +/- LAMA
Smoking Cessation
- Only treatment shown to alter disease progression
Immunisations
- Annual influenzae
- Pneumococcal if <65 or FEV1<40%
Anti-mucolytics e.g. Acetylcisteine
- Reduce risk of chest infections
Nutrition
- Poor nutritional state is linked to increased mortality and reduced immune function
When is Long Term Oxygen Therapy indicated in patients with COPD?
PaO2 < 7.3
or
PaO2 <8.0 if polycythaemic/nocturnal hypoxia/cor pulmonale or pulm HTN
Typically use >15 hours/day
Can also consider ambulatory or short burst O2 therapy
Home assessment before prescription
No smoking!
Indications for Lung Transplant in patients with COPD
BODE index >5
Post bronchodilator FEV1 <25%
Resting hypoxia and hypercapnia
Pulmonary HTN
Accelerated decline in FEV1
Can you outline medications we can offer to help with smoking cessation?
1) Nicotine Replacement Therapy
- Assess no. cigarettes/day to help with dosing
- When is their first cigarette? If on waking consider 24 hour patch as opposed to 16 hour
- Patches (long acting) +/- gum +/- inhalator
- Combination of long acting and short acting best
2) Buproprion
- Antidepressant and nicotinic antagonist
- Contraindicated in breastfeeding/pregnancy
- Risk of seizures
3) Varenicline
- Nicotine receptor agonist
- 12 week course
- Nausea/insomnia/abnormal dreams/neuropsychological effects
Indications for NIV
COPD Resp acidosis after 1 hour maximal therapy
= pH <7.35, pCO2 >6
Severe dyspnoea with resp muscle fatigue
T2RF secondary to chest wall deformity/neuromuscular disease/OSA
Cardiogenic pulmonary oedema unresponsive to CPAP
Weaning from tracheal intubation
Benefits of NIV
Bi-level positive airway pressure
- IPAP aids ventilation = removal of CO2
- EPAP recruits collapsed alveoli = improves gas exchange = improves oxygenation
Reduces needs for invasive intubation
(reduce risk of ventilator complications)
Reduce mortality
Reduce length of stay in hospital
Contraindications for NIV
Severe hypoxia (?consider if intubation and ventilation more appropriate)
Undrained pneumothorax
Facial injury
Burns
Fixed upper airway obstruction
Excessive secretions/vomiting
Reduced GCS/agitation
Indications for CPAP
Continuous positive airway pressure (PEEP, basically EPAP)
T1RF
Cardiogenic pulmonary oedema
Congestive cardiac failure
Pneumonia
Sleep apnoea
Outline common causes of Community Acquired Pneumonia
Strep pneumoniae (most common)
Haemophilus influenzae
Mycoplasma pneumoniae
Legionella
Staph Aureus (post influenza)
What is CURB scoring?
C - confusion
U - Urea>7
R - RR > 30
B - BP systolic <90
>65
<2 points, consider treating in community
CURB score of 5 has 57% 30 day mortality
CURB score of 3 has 17% 30 day mortality
What is Bronchiectasis?
Abnormal permanent dilatation and destruction of bronchi due to combination of
1) Chronic infection
2) Impaired mucus drainage
3) Airway obstruction
4) Defective host response
Occurs in distal bronchioles (no cartilage rings)
Causes of Bronchiectasis
CONGENITAL
- Cystic fibrosis (autosomal recessive)
- Kartagener’s (autosomal recessive)
- Young’s syndrome
- Yellow Nail syndrome
COPD
INFECTION
- Childhood infections e.g. measles, pertussis, TB
- Recurrent aspiration
OVERACTIVE IMMUNITY
- ABPA
UNDERACTIVE IMMUNITY
- HIV
- Leukaemia
Outline some complications of Bronchiectasis
Recurrent infections e.g. pseudomonas aeruginosa, haem influenzae
Empyema/abscess
Haemoptysis (can be MASSIVE!)
Cor Pulmonale
Cachexia
Anaemia of chronic disease
Metastatic infection e.g. CNS abscess
Secondary amyloidosis
Investigation Screen for Bronchiectasis
Sputum MC&S and AFB (multiple samples)
Spirometry - usually obstructive picture
Bloods
- Routine = FBC, U&Es, LFTs, inflam markers
- HIV
- Immunoglobulins
- Interferon gamma release assay if suspicious of TB
- Autoantibodies (vasculitis screen)
- Alpha 1 AT levels
- Aspergillus precipitans & IgE levels
CXR
HRCT is definitive test
- “Reid Classification” e.g. signet ring, tree-in-bud, tram-tracking
?Bronchoscopy
EXTRAS
- Sweat testing/genotyping if ?CF
- Nasal brushings if ?Kartagener’s
Outline the management of Bronchiectasis
Treat underlying pathology
CONSERVATIVE
- Stop smoking
- Optimise nutrition
- Vaccinations
- Sputum clearance/chest physio
MEDICAL Rx
- Antibiotics for infective exacerbations (10-14 days)
- Prophylactic azithromycin (antiinflam)
- Inhaled bronchodilators
- Inhaled steroids
- Mucolytics
SURGICAL Rx
- ?Lobectomy if localised
- Lung transplant in CF patients
Cystic Fibrosis
Autosomal recessive disease
Defect in CFTR gene on chromosome 7
- Most common defect = deltaF508
- Carrier rate = 1 in25
Defect in CFTR = chloride ions cannot leave cells = sodium and water reabsorption from mucus back into cells = thick viscous secretions
Multisystem disorder
- Nasal polyps
- Bronchiectasis and recurrent chest infections
- Diabetes (30% by age of 50)
- Malabsorption/FTT
- Biliary cirrhosis –> CLD (30%)
- Delayed puberty
- Infertility
Most diagnosed in neonatal period but 5% diagnosed after age of 18
Examples of common colonising organisms in CF
Haemophilus influenzae (early childhood)
Staph Aureus
Pseudomonas
Aspergillus
Burkholderia Cepacia = worst prognosis!
- Contraindication to lung transplant
Outline the management of CF
MDT Approach
CONSERVATIVE
- Daily chest physio and postural drainage
- Optimise nutrition
- Minimise contact with other CF pts (avoid cross infection)
- Vitamin supplements
- Pancreatic supplements
PHARMACOLOGICAL
- Treatment of pseudomonas colonisations with PO and nebulised antibiotics
- Lumacaftor / Ivacaftor
= indicated if homozygous delta F508 mutation. Increases number of CFTR proteins
SURGICAL
- Heart and lung transplant (5yr survival 60%)
Median survival 32 years but is improving
What is Young’s Syndrome?
Rare condition, unknown cause
Triad of
1) Azoospermia
2) Bronchiectasis
3) Rhinosinusitis
Often present in middle age with infertility
What is Yellow Nail Syndrome?
Rare condition, unknown cause
Usually affects >50s
2 of the 3:
1) Slow growing hard yellow finger and toe nails
2) Lymphoedema
3) Recurrent Pleural effusions + bronchiectasis
What is TB?
Infection caused by mycobacterium tuberculosis
Notifiable disease
Risk Factors for Active Pulmonary TB infection
Place of birth (Sub Sahara Africa & Asia)
Increasing age
HIV/AIDs
Homelessness/Overcrowded living spaces e.g prisons
Immunosuppression e.g. diabetes, chemo
Malignancy
Malnutrition
Outline some examples of extra pulmonary TB
TB meningitis
CNS tuberculoma
Scrofuloderma (cervical LNs)
Pericardial TB
Pott’s disease = spinal osteomyelitis
Spinal TB
Renal TB
Miliary TB = haematogenous spread to any organ