Resp Flashcards
(37 cards)
Evidence of specific cause of Pulmonary fibrosis
- RA: Boutonnières, swan neck, nodules
- Systemic sclerosis: sclerodactyly, telangiectasia, microstomia
- SLE: malar rash, discoid rash
- Sarcoidosis: erythema nodosum
- Radiation: tattoos on chest
Causes of pulmonary fibrosis
- Idiopathic
- Rheumatology - RA, SLE, SS, Sjrogren’s
- Sarcoidosis
- EAA: moulds, avian proteins
- Occupational exposure: coal, asbestos, silica
3 drugs which cause pulmonary fibrosis
Methotrexate
Amiodarone
Bleomycin
3 bedside tests for suspected pulmonary fibrosis
PEFR
Spirometry
ECG (RV hypertrophy)
Bloods for suspected pulmonary fibrosis
FBC
ABG
ESR, CRP
ANA (in IPF)
RhF and antiCCP (in RA)
ACE and Ca (in sarcoid)
Mx of pulmonary fibrosis
Conservative: smoking cessation, pulmonary rehabilitation
Medical: steroids for EAA, sarcoid, CTDs
Surgical: lung transplant
Signs of pneumonectomy/lobectomy
Tracheal shift towards abnormal side
- Reduced expansion
- Dull percussion
- No BS
Differentials for an oblique scar on lateral/posterior chest wall
- Lobectomy
- Pneumonectomy
- Thoracotomy: biopsy, empyema, abscess
- Transplant
Indications for lobectomy/pneumonectomy
90% bronchogenic carcinoma
- Bronchiectasis
- COPD: lung reduction surgery
- TB: historic, upper lobe
Pathology classification of lung cancer
NSCLC and SCLC
SQCC: bronchogenic, smoking, PTHrP + hypercalcemia
ADENOCARCINOMA: peripheral, late presentation (mets), non-smokers + women
SCLC: poor prognosis, late presentation, smokers
Complications of lung cancer
Local:
- Brachial plexus –> Horner’s syndrome
- SVCO
- Recurrent laryng nerve
- Phrenic nerve
Paraneoplastic:
- PTHrP –> Ca
- SIADH –> hyponatremia
- ACTH –> Cushings
Derm: acanthuses nigricans
Mets:
- Bone pain
- Liver failure
- Confusion, fits, focal neurology
Ix in lung cancer
Bloods: FBC, U+Es (Na), LFTs (mets), bone profile (PTH, Ca)
Imaging:
CXR
Volumetric CT
PET scan - mets
Histology: percutaneous FNA or transbronchial biopsy
Thoracoscopy + LN sampling
Pulmonary function tests (assess fitness for surgery)
Mx of lung cancer
Conservative:
Smoking cessation
Pulmonary rehabilitation
PTOT
Medical:
Chemotherapy + radiotherapy
Surgical:
If no metastatic spread!
Palliative care:
- Analgesia
- Radiotherapy - for haemoptysis, bone or CNS mets
- If persistent effusions - pleurodesis
- SVCO: radiotherapy + IV dexamethasone
Old management of TB
- Thoracoplasty (rib removal)
- Plombage (polystyrene balls in thoracic cavity)
- Phrenic nerve crush (diaphragm weakness)
- Apical lobectom
Current Mx of TB - what MUST be done before starting treatment
RIPE for 2 months
then RI for a further 4 months
- coadminster pyridoxine w isoniazid
- LFTs + visual acuity + colour vision testing
Side effects of TB treatment
Rifampicin: orange urine, cyp450 induction
Isoniazid: Peripheral neuropathy
Pyrazinamide: hepatitis
Ethambutol: optic neuritis!! (loss of colour)
Features of latent TB
Pt is infected but no clinical Sx or CXR features
- Non infectious!
Pathophysiology of primary TB infection
TB grows in pleura = Ghon focus
TB spreads to LNs:
Lung lesion + LNs = Ghon complex
Most people’s immune system controls the infection: fibrosis of Ghon focus –> calcified nodule
Diagnosis of latent vs active TB
Latent: tuberculin skin test, if +ve do IGRA
Active: CXR + 3 sputum samples.
- Culture in Lowenstein Jensen media = GOLD STANDARD
- Microscopy w Ziehl-Neelsen stain
What is the initial screening test for latent TB? what are the cons of this?
Tuberculin skin test: inject purified protein + observe induration @ 48-72hours
tests +ve if BCG, other mycobacteria :(
also tests -ve if HIV, sarcoid, lymphoma :(
Causes of a cavitating lung lesion
Infection: TB, Staph, Klebsiella
Rheumatoid nodules
Malignancy: SqCC
pulmonary fibrosis - upper lobe causes?
Lower lobe causes?
Upper:
Aspergillus
Coal, silica
EAA - bird fanciers lung
TB
Lower:
Sarcoidosis
Toxins (methotrexate, bleomycin, amiodarone)
Asbestosis
Idiopathic
Rheum: SLE, SS, RA
Silicosis
Drugs which cause pulmonary fibrosis
Bleomycin
Amiodarone
Nitrofurantoin
Methotrexate
Findings O/E of bronchiectasis
DDx
Clubbing
Dull percussion note
Bilateral coarse crackles - may CHANGE W COUGH
Ddx: CHF, Bilateral pleural effusion
