Chronic Resp Flashcards
Presentation of asthma
Cough, wheeze, SOB Worse in morning and evening Atopy in hx and FHx Smoker *chronic inflammatory airway disease characterised by intermittent airway obstruction and hyperreactivity
Ix for asthma
Bloods
PEFR
- varies by/increases >20% for >3 days/weeks over several weeks
Spirometry
- FEV1:FVC<70%
- reversibility, 12% pre- and post- bronchodilator spirometry
Rx pathways for asthma
SABA => SABA + ICS =>
SABA + ICS + LTRA => LABA + ICS +/- LTRA =>
LABA + increase ICS +/- LTRA => trials => oral CS
SABA (short acting B agonist) - salbutamol
ICS (inhaled CS) - beclometasone, budesonide
LTRA (leukotriene rec antagonist) - montelukast
LABA (long-acting) + ICS - symbicort (budesonide/formoterol)
oral CS - prednisolone
How are acute asthma attacks classified?
Moderate - PEF 50-75% Acute-severe - PEF 33-50% Life-threatening - PEF <33% Near fatal - pCO2 raised *peak expiratory flow
Ix for acute asthma attacks
Basic obs PEF O2 sat and maintain SpO2 at 94-98% ABG (repeat if PaO2 <8kPa unless SpO2 <92% or PaCO2 normal/raised or pt deteriorates) serum K+ and glucose
Rx for acute asthma attack
Nebulised salbutamol 5mg Nebulised ipratropium bromide 0.5mg Oral prednisolone 40-50mg IV hydrocortisone 100mg => IV magnesium sulphate Call senior help => IV aminophylline => ITU + intubation
COPD presentation
SOB, productive cough, some wheeze Older age Heavy smoking status Barrel chest NO clubbing
How is COPD classified?
All have a FEV1/FVC < 0.7
FEV1 readings: Mild = >80% Moderate = 50-79% Severe = 30-49% Very severe = <30%
Ix for COPD
Spirometry (determine severity)
Bloods, ABG (check for alpha-1 antitrypsin)
ECG (assess cardiac status for cor pulmonale)
CXR (lung reduction associated with increased survival)
Serial peak flow measurements
Rx based on severity
Mild => SABA/SAMA (salbutamol, ipratropium bromide)
Moderate => SABA + LABA/SAMA + LAMA (tiotropium/salmeterol)
Severe => LABA + LAMA/LABA + ICS (symbicort)
Very severe => LAMA + LABA + ICS (tiotropim + symbicort)
Mx of COPD
General - smoking cessation - annual influenza vaccine - pneumococcal vaccine Improve survival - smoking cessation - long term O2 therapy (15hrs/day) - lung volume reduction surgery
When would a COPD pt start oxygen therapy?
1) pO2 < 7.3kPa
2) pO2 7.3-8kPa + one of the following:
- secondary polycythaemia
- nocturnal hypoxaemia
- peripheral oedema
- pulmonary HTN
Acute exacerbation of COPD rx
(Blue Venturi) 24% O2 => Nebulised salbutamol 5mg Nebulised ipratropium bromide 0.5mg Oral prednisolone 40-50mg IV hydrocortisone 200mg => IV amoxicillin => 500mg IV aminophylline => BiPaP (NIV) (type II resp. failure)
Name types of interstitial lung diseases
Idiopathic pulmonary fibrosis
Hypersensitivity Pneumonitis
Sarcoidosis
Pneumoconiosis
What may present in the hx of a pt with idiopathic pulmonary fibrosis?
SOBOE, dru cough, no wheeze Clubbing Animal/vegetable dusts Smoking status baad Occupational exposure to metal/wood Chronic microaspiration Drugs: bleomycin, methotrexate, amiodarone