Resp Flashcards
Type 1 respiratory failure?
Hypoxia associated with hyperventilation and low CO2
Type 2 respiratory failure?
Hypoxia associated with hypoventilation, thus reduced clearance of CO2.
Acute states- respiratory acidosis
Bronchiectasis Definition?
permanent irreversible dilatation of bronchi and bronchioles
Aetiology of bronchiectasis?
Obstruction with severe infection or severe infection alone e.g. whooping cough
Genetics (CF, Kartagener’s syndrome)
Immunodeficiency (hypogammaglobulinemia)
Clinical features of bronchiectasis?
Chronic cough
Purulent sputum, sometimes blood
Finger clubbing
What part of the lung is most affected by bronchiectasis?
Lower lobes
Manifestation of Cystic Fibrosis?
meconium ileus recurrent and frequent infections w/ pseudomonas Bronchiectasis chronic pancreatitis malabsorption
Diagnosis of Cystic Fibrosis?
Prenatal screening
Measure chloride conc. in sweat
Obstructive Airways on PFTs?
Dec. FEV1
Normal or Dec. FVC
Dec. FEV1/FVC ratio
In what percentage of COPD is smoking implicated?
90%
What do ‘blue bloater’ and ‘pink puffer’ indicate?
Chronic Bronchitis
Emphysema
Chronic Bronchitis Definition?
persistent productive cough on most days for a minimum of 3 months of the year for no less than 2 consecutive years, which can’t be contriubted to any other cardiac or respiratory cause
Emphysema Definition?
abnormal, permanent enlargement of the airspaces distal to the terminal bronchiole, due to destruction of their walls and with minimal fibrosis
Chronic Bronchitis Pathology?
Irritants (most commonly cigarette smoking) cause:
Hypersecretion of mucous
Inflammation and fibrosis -> obstruction
Squamous metaplasia/dysplasia/SCC can occur
The most common form of emphysema?
Centri-acinar
The most common form of emphysema?
Centri-acinar
Where does centri-acinar emphysema occur?
Upper lobes
What is centri-acinar emphysema associated with?
Smoking, coal dust
What is pan-acinar emphysema associated with?
Alpha 1 Antitrypsin deficiency
Where does pan-acinar emphysema usually affect?
Lower lobes
Types of bronchial asthma?
Atopic (most common)
Non-atopic
Drug-induced asthma (aspirin)
Occupational asthma
What causes atopic asthma?
Type 1 IgE mediated Hypersensitivity reaction
What causes non-atopic asthma?
No evidence of allergens
Viral causes/inhaled air pollutants
What drug can induce asthma?
Aspirin
What is allergic bronchopulmonary aspergillosis?
proximal bronchiectasis seen in patients with asthma
inhalation of aspergillus spores
What is obliterative bronchiolitis?
rare
lumen of small bronchioles become obliterated by fibrous tissues
What causes obliterative bronchiolitis?
CT disease, IBD, Transplant (Graft vs. Host Disease, Chronic lung allograft rejection)
Causes of Pulmonary Embolism?
Thromboembolism!!!!!
Tissue embolism, tumour embolism, foreign body embolism, fat embolism, amniotic fluid, air/gas (Caisson’s disease-bends)
Virchow’s Triad?
Stasis, Hypercoagulability, Injury
Risk for PEs?
heart disease, increased age, bed rest & immobility, OCP, tissue injury, late pregnancy, previous PE
Symptoms of Pulmonary Embolism?
dyspnoea, fever, haemoptysis, cough, signs of pleuritis, rales, tachycardia
often can be silent
Pulmonary Oedema definition?
accumulation of fluid within the interstitium and alveolar airspaces