Resp Flashcards
CPAP and BIPAP which is used to treat Type 1 vs 2 resp failure
CPAP T1, BIPAP T2
Name 3 types of COPD
Chronic bronchitis, emphysema, Alpha-1 Antitrypsin (A1AT) deficiency
What are risk factors for COPD
Cigarettes
Air pollution
Genetics (A1AT deficiency)
What inheritance pattern is A1AT deficiency
Autosomal co-dominant
What is the pathology of chronic bronchitis
Hypertrophy+ hyperplasia of mucous glands (as protective against RF)
Chronic inflammation cells infiltrate bronchi- luminal narrowing
Mucus hypersecretion, ciliary dysfunction, narrowed lumen
How long does someone have a cough for nd cough sputum for to be classed as chronic bronchitis
2 periods of Cough with sputum 3+ months over 2 years
What is the pathology of emphysema
Destruction of the elastin layer in alveolar ducts/ air sacs and resp bronchioles.
Elastin keeps these walls open during expiration so decreased elastin traps air distal to the blockage
What are different types of emphysema
Centriacinar:- resp bronchioles
Panacinar:- r.b, alv, alv sacs
Distal acinar
Irregular
What emphysema are smokers most at risk from
Centriacinar
What is the pathology of A1AT deficiency
A1AT degrades neutrophil elastase which protects the lungs from excess damage to the elastin layer. A deficiency in liver production of A1AT leads to panacinar emphysema and liver issues.
Where is A1AT produced
Liver
Who do you suspect A1AT deficiency in
Young/ middle aged men with emphysema with COPD Sx but no history of smoking
What are Sx of COPD
Typically older, chronic cough w/ (often purulent) sputum
Extensive smoking Hx and constant dyspnoea
Blue bloater (COPD) Sx
Chronic purulent cough
Dyspnoea
Cyanosis
Obesity
Pink puffer (emphysema) Sx
Minimal cough
Pursed lip breathing
Cachectic (muscle loss)
Barrel chest+ hyper resonant percussion
What is a complication of emphysema
Bullae rupture (Bullae is a large air sac)
What finding do you get on spirometry of obstructive disease
FEV1:FEV <0.7
What is difference in change of FEV1 in bronchodilator reversible and irreversible obstruction
<12% irreversible (COPD)
>12% reversible (Asthma)
What is a complication of COPD
Cor pulmonale
RHS heart failure due to increased pulmonary HTN
What is DlCO
Diffsuion capacity of CO across lung
How does DlCO differ in asthma from COPD
Low in COPD
Normal in asthma
Other than spirometry and DLCO, what other investigation might you perform in someone with suspected COPD
Genetic testing for A1AT
ABG show T2RF
ECG
CXR
What can CXR show in a patient with COPD
Flattened diaphragm + bullae formation
What is long term management for COPD
Influenze+ pneumococal vaccines
1- SABUTEROL
2- SALBUTEROL+ SALMETEROL+ TIOTROPIUM
3-(2+) Inhaled corticosteroids
What is O2 sat target for patients in hospital with acute COPD attack
88-92 because excess O2 is dead space leading to V/Q mismatch and increased CO2 retention (resp acidosis)
What are the 2 types of asthma
Allergic 70%
Non-allergic 30%
Differences between allergic and non-allergic asthma
Allergic:- IgE mediated, Extrinsic, T1 Hypersensitivity, due to environmental trigger, often early presentation
Non-allergic:- non IgE mediated, intrinsic, may prevent later, harder to treat, associated with smoking
Triggers for asthma
Infection, allergies, cold weather, exercise, drugs (beta-blockers, aspirin)
What is the atopic triad
Atopic rhinitis, asthma, eczma
What is samters triad
Nasal polyps, asthma, aspirin sensitivity
How can aspirin exacerbate Asthma
Aspirin inhibits COX-1/2 so shunts more arachidonic acid
Pathology of asthma
Overexpressed TH2 cells in airway exposed to trigger. TH2 cytokine release leads to IgE production and eosinophil recruitment. Both lead to bronchial constriction.
What cytokines are released by TH2 in asthma
IL-3,4,5,13
How does IgE production lead to bronchial constriction
Mast cell degranulation
Histamines
Leukotrienes
Tryptase
How do eosinophils lead to bronchial constriction in asthma
Release toxic proteins
What happens over time in asthma
Chronic remodelling
What is treatment for chronic Asthma
1:- Salbutamol
2:- SAB2A+ Inhaled corticosteroid
(Asses inhaler technique)
3:- SAB2A+ ICS + Leukotriene receptor antagonist
4:- SAB2A + ICS+ Salmeterol +/- LTRA
5:- Increase ICS dose
What is an example of a leukotriene receptor antagonist
Montelukast
What is treatment for exacerbations of asthma
OSHITME
O2
nebulised Salbutamol
Hydrocortisone (ICS)
IV MgSO4
IV Theophylline
BIPAP
+/- Abx if infection present
What is lung cancer of the plura called (primary)
Mesothelioma
If primary lung cancer is in the lung parenchyma what is name
Bronchial
How can you divide Bronchial lung cancers
Small cell 20%
Non-small cell 80%
What are the non-small cell lung cancers
Squamous cell carcinoma 20%
Adenocarcinoma 40%
Carcinoid
Large Cell 10%
What are the main metastisis sites of lung cancer
Bone, Liver, Adrenals, Brain, Lymph nodes
What is the main cause of mesothelioma
Asbestos (typically don’t present until decades after exposure)
Who is the common presentation for mesothelioma
Male 40-70
What are standard cancer symptoms
Weight loss, night pain, TATT
What are Sx of lung cancer
SOB, persistent cough, pleuritic chest pain
Hoarse voice from tumour pressing on recurrent laryngeal nerve
What is 1st line investigation in lung cancer
CXR
What do you see on XR/ CT in mesothelioma
Pleural thickening +/- effusion
What is the diagnostic investigation for mesothelioma
Biopsy
What antigen is non-specifically raised in mesothelioma
Cancer antigen 125
(Raised in many tumour)
What is management for mesothelioma
Usually palliative even though unlikely to distantly metastise
If found early can try surgery + chemo/ radio but generally resistant
What is a BALT lymphoma
A non-Hodgkin lymphoma originating in bronchi
Bronchus associated lymphoid tissue
Who exclusively suffers from small cell carcinomas
Smokers
What are Small cell lung cancers
Neurosecretory granules release neuroendocrine hormones. Responsible for many paraneoplastic syndromes such as Cushings and SIADH
What are complications of SCLC
Ectopic ACTH:- Cushings
Ectopic: ADH:- SIADH
Lambert Eaton syndrome:- autoimmune vs NMJ
Fast-growing and early metastasis
What is Lambert Eaton Syndrome
The result of antibodies produced by the immune system against SCLC also targets voltage-gated calcium channels sited on presynaptic terminals on motor neurons.
What are Sx of Lambert Eaton Syndrome
Weakness in proximal muscles
Diplopia (double vision)
ptosis
slurred speech/ dysphagia
Autonomic dysfunction (dry mouth/ dizziness)
Which part of the lung does squamous cell carcinoma affect
Central lung
What hormone may lung squamous cell carcinoma secrete
PTHrP can lead to hypercalcemia
From where does squamous cancer in the lung arise from
Lung epithelium
What is metastasis/ spread of lung squamous cancer
Late Mets
Local spread mostly
Most common cause of squamous lung cancer
Smokers
Most common cause of lung adenocarcinoma
Asbestos
What part of the lung does an adenocarcinoma effect
Peripheral lung
From where do lung adenocarcinoma arise
Mucus secreting glandular epithelium
What is common mets location for lung adenocarcinoma
Bone, brain, adrenals, lymph nodes, liver
What genetics is are lung carcinoid tumours associated with
MEN1 mutation
Neurofibromatosis 1
What hormone does a lung carcinoid tumour secrete
Serotonin
What scale is used to assess the level of dyspnoea
MRC breathlessness scale
When do Sx present with a carcinoid tumour
When liver mets present
What is 1st line investigation in suspected lung cancer
CXR, CT
What is the diagnostic investigation for lung cancer
Bronchoscopy+ biopsy
What test is used to give staging to lung cancer
MRI
What is treatment for non small cell cancer
Surgical excision is early
Met:- Chemo/ radio MAB therapy
Are primary or secondary lung tumours more likely
Secondary as all blood comes through lungs
Which cancers met to lungs often
Breast, kidney, bowel, bladder
What is a Pancoast tumour
Tumour in lung apex that metastasises to neck’s sympathetic plexus causing Horners Syndrome:- Ptosis, myosis, anhidrosis