8 - Lung Cancer, Pleural Disease and ILD Flashcards
What are some diseases of the pleura?
- Pneumothorax
- Pleural effusion
- Empyema
- Pleural tumours
- Pleural plaques
- Pleural thickening
What are some of the causes of a pneumothorax?
1. Spontaneous (primary with no lung disease or secondary with lung disease)
2. Traumatic
3. Tension
4. Iatrogenic (post central line or pacemaker insertion)
What are some primary and secondary causes of a spontaneous pneumothorax?
Primary: young thin men with ruptured subpleural bulla
Secondary: asthma, COPD, TB, lung fibrosis, CF, Marfan’s, EDS
What are some iatrogenic causes of a pneumothorax?
- Subclavian CVP line insertion
- Pleural aspiration
- Transbronchial biopsy
- Liver biopsy
- Positive pressure ventilation
What are some risk factors for developing a pneumothorax?
- Pre-existing lung disease
- Height
- Smoking
- Diving
- Trauma/Chest procedure
- Conditions e.g Marfan’s
What are the signs and symptoms of a pneumothorax?
Symptoms: if small asymptomatic, sudden onset dyspnea, pleuritic chest pain
Signs: reduced expansion, hyperresonance to percussion, diminished breath sounds, if tension pneumothorax trachea is deviated to opposite side
How is a pneumothorax managed? (not tension)
NEW GUIDELINES
How is a tension pneumothorax managed?
Large bore cannula into 2nd ICS MCL then insert a chest drain
Do this BEFORE a CXR
What are the two different types of pleural effusion?
Transudate: protein concentration <25g/L
Exudate: protein concentration >35g/L
What are some of the causes of pleural effusions?
Transudates: heart failure, cirrhosis, constrictive pericarditis, hypoalbuminaemia (peritoneal dialysis or nephrotic syndrome), hypothyroidism, mitral stenosis, PE, Meig’s syndrome
Exudates: infection, inflammation (RA, pancreatitis) malignancy, Yellow nail syndrome, drugs
What is Meig’s syndrome?
Right pleural effusion and ovarian fibroma
How you do you tell the difference between a transudative and exudative pleural effusion?
Light’s Criteria
if borderline protein use this, only needs one or more of the following to be an exudate
What are the signs and symptoms of a pleural effusion?
Symptoms: asymptomatic, pleuritic chest pain, dyspnea
Signs: decreased expansion, stony dull percussion, diminished breath sounds, decreased vocal resonance, if large may have tracheal deviation away from effusion
Look for stigmata of other disease to try and determine cause
What investigations should you do for a pleural effusion?
- History and exam
- CXR
- Diagnostic apsiration
- Pleural biopsy (CT guided or thoracoscopic)
- ECG
- Bloods: FBC, U+Es, LFTs, CRP, Bone profile, LDH, clotting
- ECHO is supect heart failure
- Staging CT if suspect exudative
What does a pleural effusion look like on CXR?
- Blunting of costophrenic angles
- Shadows with menisci
What should you send a pleural aspiration off for?
Chemistry: protein, glucose, pH, LDH, amylase
Bacteriology: microscopy and culture, TB stain
Cytology
Immunology: rheumatoid factor, ANA, complement
Why should you not put in a chest drain for a pleural effusion before a well established diagnosis?
When would an urgent chest drain only be indicated?
Only put in if diagnosis is well established. Draining all the fluid off can hinder the opportunity to get pleural biopsies
Urgent chest drain only if underlying empyema (pH<7.2 or visible pus on aspirate)
How do you manage a pleural effusion?
- Therapeutic aspiration/drainage via tap or intercostal drain. Repeat as many times as needed. Use chest drain if empyema.
- Pleurodesis
- Surgery if persistent collections and increasing pleural thickness
How do you treat a transudate pleural effusion?
What is interstital lung disease?
Umbrella term for a number of conditions that primarly affect the lung parenchyma in a diffuse manner
Usually have chronic inflammation or progressive interstitial fibrosis
What are some of the underlying diseases causing interstitial lung disease?
- Usual interstitial pneumonia (UIP)
- Non-specific interstitial pneumonia (NSIP)
- Sarcoidosis
- Drug induced
- SLE
What are some clinical features of interstitial lung disease?
- Dyspnea on exertion
- Paroxysmal non-productive cough
- Abnormal CXR
- Restrictive pattern on spirometry
What are some blood tests that should be ordered when a patient is diagnosed with ILD from a lung biopsy?
- ANA
- ENA
- Rheumatoid factor
- Anti-GBM
What is the most common cause of idiopathic pulmonary fibrosis and what are the signs and symptoms of this?
UIP (usual interstitial pneumonia)
Symptoms: dry cough, exertional dyspnea, malaise, arthralgia, weight loss
Signs: cyanosis, finger clubing, reduced chest expansion, fine inspiratory crepitations, may have pulmonary hypertension
What will idiopathic pulmonary fibrosis show on blood tests and CXR?
Bloods: lowered PaO2 on ABG, increased CRP, may have ANA or RhF+
CXR: decreased lung volume, bilateral lower zone shadows, honeycomb lung
What is the management for idiopathic pulmonary fibrosis (UIP)?
- Oxygen
- Pulmonary rehabilitation
- Opiates
- Consider lung transplant
- Consider palliative care
What is extrinsic allergic alveolitis? (a.k.a hypersensitivity pneumonitis)
Repetitive inhalation of allergens (e.g fungal spores or avian proteins) that a patient has already been sensitised to so this provokes a hypersensitivity reaction
In acute phase alveoli are filled with acute inflammatory cells. If diagnosed early and remove allergen can reverse process. If chronic can lead to granuloma formation and obstructive bronchiolitis
What are some causes of extrinsic allergic alveolitis?
Exposure to mould and spores
- Farmers and Mushroom worker’s lung
- Bird/Piegeon Fancier lung
- Malt worker lung
- Sugar worker lung
What are the clinical features of extrinsic allergic alveolitis?
Acute (4-6h post exposure): Fever, rigors, myalgia, dry cough, dyspnea. Reversible and resolves spontaneously after 1-3 days
Chronic (months-years): Finger clubbing, dyspnea, weight loss, Type 1 Respiratory failure, Cor Pulmonale. Less reversible
How do we manage extrinsic allergic alveolitis?
Acute: remove allergen and give O2, PO prednisolone
Chronic: allergen avoidance or wear facemask, long term steroids, seek compensation
What are some causes of fibrotic shadowing on x-ray?
What is sarcoidosis and what is the aetiology of this?
Multisystem inflammatory granulamotous disorder. (Non-caseating granulomas). Usually affects respiratory system but can affect other areas
Associated with HLA-DRB1 and DQB1 alleles
Affects: age 20-40 years, Afro-Caribbeans
What does sarcoidosis do to the respiratory system?
- Pulmonary infilitrates of fibrosis
- Dry cough
- Progressive dyspnea
- Chest pain
- Decreased exercise tolerance
What are some extra-thoracic manifestations of sarcoidosis?
- Lymphadenopathy
- Hepatosplenomegaly
- Uveitis
- Conjunctivitis
- Erythema nodosum
- Arrhythmias
- Renal stones
- Spinal syndromes
- Bone cysts
- Hypercalcaemia
What investigations should you do for sarcoidosis?
- Lung function tests (obstructive until fibrosis then restrictive)
- CXR (4 stages)
- Bloods (increased ACE, increased Ca, increased ESR)
- Urinary calcium (increased)
- ECG/ECHO/Cardiac MI (may show arrhythmias)
- CT/MRI head (neurosarcoidosis)
- Tissue biopsy (diagnostic showing NCGs)
What are the stages of pulmonary sarcoidosis?
Based on CXR
0 - Normal
1 - BHL
2 - BHL and Pulmonary Infiltrates
3 - Peripheral pulmonary infiltrates alone
4 - Pulmonary fibrosis
What is the diagnostic test for sarcoidosis?
Tissue biopsy of lung (thoracoscopic), liver or lymph nodes showing non-caseating granulomas
Bronchoalveolar lavage can help diagnosis
How is sarcoidosis managed?
- No treatment: if just BHL often resolves spontaneously
- NSAIDs and bed rest: if acute sarcoidosis
- Immunosuppressants and Anti-TNFa: severe disease
- Corticosteroids: see future flashcard
- Lung Transplant: severe disease
What are the treatment principles for ILD in general?
What are some causes of bilateral hilar lymphadenopathy?
What is the prognosis of lung cancer?
Biggest cause of cancer death worldwide
5 year survival is 13%
What are some risk factors for developing lung cancer?
- Smoking
- Airflow obstruction
- Increasing age
- Family histroy
- Asbestos
- Radiation
What are some signs and symptoms of lung cancer?
Symptoms: cough, haemoptysis, dyspnea, chest pain, weight loss, anorexia, hoarse voice
Signs: cachexia, anaemia, clubbing, supraclavicular lymphadenopathy, pleural effusion, metastatic signs (bone tenderness, hepatomegaly,)
What are some complications of lung cancer?
- Laryngeal nerve palsy
- Phrenic nerve palsy
- SVC obstruction (plethoric face and tortorous veins)
- Horner’s Syndrome (Pancoast tumour)
- SIADH
- Hypercalcaemia
- Lambert Eaton syndrome
- Cushing’s
- Addison’s (metastases)
What is the WHO performance status?
Indication of patients level of fitness
What are some tests done once lung cancer is suspected to aid diagnosis?
- Bloods: FBC, U+Es, LFTs, INR
- CXR
- Biopsy
- Staging CT or PET scan to detect small metastases that may not be seen on CT
- Bone scan
- Lung function tests: to assess whether lobectomy
What are some things you may see on a CXR with lung cancer?
- Hilar enlargement
- Peripheral nodule
- Pleural effusion
- Consolidation
- Lung collapse
- Bony secondaries
What are some ways of obtaining a biopsy/histological samples from a suspected lung cancer?
- Bronchoscopy: CT guided
- CT biopsy
- US guided neck node FNA: cytology if lymphadenopathy
- Thoracoscopy: for cytology of pleural effusion
What are the different histologies for lung cancer?
- Small cell lung cancer (Oat cell)
- Non small cell lung cancer: SCC, adenocarcinoma, large cell carcinoma, bronchoalveolar cancer
- Other: carcionoid tumour
How does small cell lung cancer usually present?
Arises from endocrine cells that secrete polypeptide hormones so leads to para-neoplastic syndromes
- Cushing’s from ACTH secretion
- SIADH
- Gynaecomastia
- Labert Eaton Syndrome
What paraneoplastic syndromes do non small cell lung cancer present with?
- Hypercalcaemia of malignancy (PTHrP)
- Occurs with squamous cell carcinoma which is the most common NSCLC
What is the prognosis with SCLC and NSCLC?
NSCLC: 15% 5 year survival overall. Stage 1 after resection 60-75%, Stage 2 after resection 30-55%, Stage 3 3%, Stage 4 1%
SCLC: Rapid growth so often too extensive for surgery at diagnosis. 4-12 weeks survival untreated, combination chemotherapy 6-15 month survival
What are the principles of treatment in SCLC and NSCLC?
SCLC: (often palliative)
- Consider surgery if early stage
- Chemotherapy +/- radiotherapy if well enough
- Palliative radiotherapy for bronchial obstruction, bone pain, SVC obstruction
- Can do pleural drainage/pleurodesis for pleural effusions
NSCLC:
- Curative lobectomy if low stage
- Radical radiotherapy
- Chemo-radio for more advanced
What are the clinical features of malignant mesothelioma?
Tumour of mesothelial cells that often occurs in the pleura. Related to previous asbestos exposure, often 45 years before.
Signs/Symptoms: chest pain, dyspnea, weight loss, finger clubbing, recurrent pleural effusions, lymphadenopathy
What is obstructive sleep apnoea?
Upper airway obstruction during sleep due to intermittent closure of pharyngeal airway
Causes sufficient sleep fragmentation so daytime somnolence
Often obese middle aged men
What is the pathophysiology of obstructive sleep apnea?
Upper airway patency depends on pharyngeal dilator muscle activity. Muscles relax during sleep.
Can have a small pharyngeal size whilst awake so when relaxing during sleep can cause critical narrowing
OR
Excessive narrowing with relaxation during sleep
What are some causes of small pharyngeal size and excessive narrowing of the airway during sleep?
Small pharyngeal size:
- Fatty infiltration of pharyngeal tissues due to increased neck fat
- Large tonsils
- Craniofacial abnormalities
- Extra submucosal tissue e.g myxoedema
Excessive Narrowing:
- Obesity can enhance muscle dilator relaxation
- Neuromuscular diease e.g stroke, MND
- Muscle relaxants e.g alcohol, sedatives
- Increasing age
What are some of the symptoms of obstructive sleep apnea?
- Daytime somnolence (Epworth >9)
- Loud snoring
- Nocturia
- Decreased libido
What is the Epworth sleepiness scale?
Points for 0 (never doze), 1 (slight chance), 2 (moderate chance), 3 (high chance)
>9 in OSA
How is OSA diagnosed?
- Overnight oximetry or video recordings
- Limited sleep study (most common): oximetry, snoring, body movement, heart rate, oralnasal flow, chest movements, leg movements
- Full polysomnography: limited study plus EEG, EMG
How is OSA managed?
- Weight loss
- Avoid smoking and alcohol
- Mandibular advancement device
- CPAP via nasal mask
- Surgery to relieve obstruction e.g tonsils
CONSIDER OCCUPATION AND WHETHER TO INFORM DVLA
How does CPAP help OSA?
- Usually nasal mask
- Upper airways held open by 10cm H2O pressure to prevent airway collapse, stops sleep fragmentation so less daytime somnolence
- Also opens collapsed alveoli
What is the difference between CPAP and BIPAP?
CPAP:
- Supplies constant positive pressure through inspiration and expiration so not ventilatory support
BIPAP:
- Form of NIV and ventilatory support as two levels of positive pressure
How do SABA and LABAs work and what are some of the side effects of these?
- Tremors
- Headache
- GI upset
- Palpitations
- Tachycardia
- HypoK
How do SAMAs and LAMAs work, what are some examples of these and what are the side effects?
- Dry mouth
- Constipation
- Headache
- Be careful in BPH and acute closure glaucoma
How do xanthines work for Asthma, what are some examples and what are the side effects of these?
How do ICS work for Asthma and COPD, what are some examples of these and what are the side effects?
How do oral corticosteroids work for Asthma, what are the side effects and what are some examples of these?
Where does lung cancer typically metastasise to?
- Liver
- Bones
- Brain
How do you diagnose a pleural effusion?
- CXR/CT/US
- Thoracocentesis
What are some symptoms of ILD?
- Exertional dyspnea
- Dry cough
What are the common types of ILD?
- Idiopathic
- Drug related
- Autoimmune
What stage of ILD is this?
Stage 4: pulmonary fibrosis
What does this CXR show?
- Poor cardiac borders due to lung parenchymal disease
- Diffuse alveolar shadowing
ILD!!!!
What is the diagnostic imaging for ILD?
High resolution CT
