Resp Flashcards
What results after exposure to antigen in sensitised individual during anaphylactic shock
Histamine release ~> capillary leak, oedema, wheeze, cyanosis
List the steps in treating a patient with anaphylaxis
- remove trigger
- maintain airway and intimate if necessary
- 100% O2
- IM adrenaline 0.5mg
- IV hydrocortisone 200mg
- IV chlorpheniramine 10mg
- fluid resusc if hypotension
- NEB salbutamol
- NEB adrenaline
List the drugs given IM or IV in anaphylactic shock, and their doses
- IM adrenaline
- IV hydrocortisone
- IV chlorpheniramine
What NEBs would you give in anaphylaxis
Salbutamol
Adrenaline
Define mild asthma
Pefr > 75%
Define moderate asthma
Pefr 50-75%
Define severe asthma
- Pefr 33-50% of best or predicted
- cannot complete sentences
- resp rate > 25/min
- hr > 110/min
Define life threatening asthma
- Pefr less than 33%
- sats less than 92% or po2 less than 8kpa
- silent chest
- exhaustion, confusion
- normal pco2
Define near fatal asthma
Raised paco2 (co2 retention)
What are the steps for managing acute asthma exacerbation
- ABCDE
- O2 as needed
- nebulised salbutamol 5mg
- oral prednisolone 40mg / IV hydrocortisone if po not possible
How do you manage sever asthma
Nebulised ipratropium bromide 500mcg
Salbutamol back to back may be needed
How do you manage life threatening or near fatal asthma
- urgent itu/anaesthetist assessment
- urgent portable CXR
- IV aminophylline
- IV salbutamol if nebulised is ineffective
What is the mechanism of action of ipratropium bromide
Anticholinergic - blocks M3 receptors
What so2 would you aim for in a patient with COPD
88-92%
How do you manage COPD exacerbations
Oxygen via Venturi mask NEBs - salbutamol, ipratropium Prednisolone 30mg od 7/7 Abx if infection indicated CXR Consider niv/itu
When would you consider niv in a patient with exacerbation of COPD
Type 2 resp failure and ph 7.25-7.35
When would you consider itu referral in a patient with COPD exacerbation
Ph less than 7.25
What are the features on investigation and CXR that would indicate pneumonia
- consolidation on CXR
- fever
- purulent sputum
- raised wcc
- raised CRP
Define anaphylaxis
A type 1 ige-mediated hypersensitivity reaction
What are the parts that make up the CURB65 score
C - confusion, mmt 2 or more points worse
U - urea >7.0
R - Resp rate > and including 30/min
B - BP less than 90 systolic or 60 diastolic
65 yo or older
What does the CURB65 score predict
Mortality in community acquired pneumonia
How should a patient with a curb65 of 0-1 be treated
As outpatient
How should patient with curb65 of 2 be treated
Consider short hospital stay
How should a patient with curb65 of 3-5 be treated
Hospitalisation + consider if they need itu
What are the two ways to define a massive haemoptysis
- > 240mls in 24 hours
- >100mls/day over consecutive days
How is massive haemoptysis managed
ABCDE
- lie patient on side of suspected lesion
- oral tranexamic acid
- stop NSAIDs/aspirin/anticoagulants
- abx if suspected RTI
- consider vit k
How would you investigate someone with massive haemoptysis
Ct aortogram
How does tranexamic acid work?
Inhibits breakdown of fibrin by inhibiting plasminogen being converted to plasmin (plasmin acts to cause fibrin degradation)
What features would you see on an X-ray of a patient with tension pneumothorax
- lung is blacker on side of tension pneumothorax
- mediastinum shifted into contralateral hemithorax
- trachea deviated away from side of pneumothorax
- kinking and compressing of great veins
What may be found on examination of patient with tension pneumothorax
- increased percussion note (hyper resonance)
- reduced air entry
- reduced breath sounds
…on affected side
What is the management of tension pneumothorax
- large bore iv cannula into 2nd intercostal space in mid clavicular line
- chest drain into affected side
List some of the symptoms and signs of PE
- sudden onset pleuritic chest pain
- pleural rub
- sob
- haemoptysis
- syncope
- hypotension
- tachypnoea
- cyanosis
At what O2 sats would you perform abg
Less than92%
What are the major risk factors for PE
- surgery
- obstetric causes
- lower limb #
- varicose veins
- malignancy
- reduced mobility
- previous proven vte
Give a couple of surgical procedures that are major risk factors of PE
Abdo/ pelvic
Knee or hip replacement
Give the steps for managing PE
ABCDE
- O2
- fluids
- thrombolysis if massive PE confirmed
- full anticoagulation
What would you thrombolyse with in massive PE
Iv alteplase
What defines massive PE
Hypotension/imminent cardiac arrest
List some of the relative factors which act to contraindicate thrombolysis
Warfarin
Pregnancy
Advanced liver disease
Infective endocarditis
What may an ecg show with PE
Sinus tachycardia
Right axis deviation
Rbbb
Af
What may be seen on CXR with a PE
- Small pleural effusion
- Wedge shaped area of infarction
What may ABGs show in a patient with PE
Pao2 reduced
Paco2 reduced
Often acidosis
(Hypervenitaltion and decreased gas exchange)
What is a d diner blood test helpful in diagnosing
PE
What towns investigations apart from ecg and CXR may you perform in a patient with suspected PE
CT pulmonary angiogram
V/Q scan
Give some of the preventative measures for PE
- TED stockings
- LMWH
- avoid contraceptive pill
- anticoagulation
At what blood pressure would you start to consider massive PE
Less than 90mmhg systolic
What conditions is asthma often associated with in patients
- eczema
- hay fever
- allergies
- (significant portion also have acid reflux)
Give some of the signs of asthma on inspection
- tachypnoea
- audible wheeze
- hyper inflated chest
What may you find when examining the chest of a patient with asthma
- hyper resonant percussion
- diminished air entry
- widespread
- polyphonic wheeze
What is asthma
A chronic inflammatory disease of the airways, where obstruction is reversible
Describe the diurnal variation of asthma
Marked morning dipping of peak flow can predispose to attack
Give the two main differentials for wheeze
Acute asthma exacerbation
Bronchitis (inc COPD)
What is churg Strauss syndrome
autoimmune condition causing vasculitis, occurs in patients with a history of airway hypersensitivity
What is wegeners granulomatosis
Form of vasculitis that can cause damage to the lung and kidneys
What is the pathophysiology of asthma
- airway epithelial damage
- inflammatory reaction - mast cells, eosinophils, T cells
- increased numbers of goblet cells
- cytokines amplify inflamm
- mucus plugging if severe
What are the features of airway epithelial damage in asthma
- BM thickening
- Sub epithelial fibrosis
What are some of the inflammatory mediators involved in asthma pathophysiology
- histamine
- leukotrienes
- prostaglandins
What is the criteria that make a patient suitable for discharge following exacerbation of asthma
- pefr >75%
- not needed nebulised inhalers for at least 24hours
What steps would be take to manage a patient after discharge following presentation with acute asthma exacerbation
- 5 days oral prednisolone
- provide pefr meter
- written asthma action plan
- gp follow up 2 working days
- Resp clinic follow up within 4 weeks
What is eosinophilia
Increased eosinophil count in response to allergens, drugs etc
List the trigger factors for asthma
- smoking
- urti
- allergens
- exercise/cold air
- occupational irritants
- drugs
- foods/drinks
- stress
How may aminophylline/theophylline be useful in treating asthma
Given as prophylaxis at night to prevent morning dip
What are some of the side effects of b2 agonists
- tachy
- reduced K+
- tremor
- anxiety
Why may LABAs be useful in treating asthma
Can help nocturnal symptoms and reduce morning dips
Why should a patient rinse their mouth after using inhaled steroids
Prevent oral candidiasis
How may you distinguish whether there is an occupational explore which brings on asthma attacks
Ask patient if they get less/no symptoms over the weekend or during holidays; ask them to measure their peak flow during work and home
What is step 1 of the BTS guidelines for asthma management
Inhaled short acting B2 agonist
What is step 2 of the BTS guidelines for asthma management
Add inhaled steroid (appropriate to severity of disease)
What is step 3 of the BTS guidelines for asthma management
Add LABA +/- theophylline +/- B2 agonist tablet
- if only some response, increase steroid dose
- if no response, stop LABA and increase steroids
What is step 4 of the BTS guidelines for asthma management
Add leukotriene receptor antagonist eg montelukast
What is step 5 of the BTS asthma management plan
Daily steroid tablet
Refer for specialist care
On a ct scan, if one were to see dark round areas, what do they indicate
Air retention causing bullae
When is anti IgE monoclonal antibody treatment indicated in a patient with asthma e.g. Omalizumab
Selected patients with persistent allergic asthma
What is the definition of COPD
A condition characterised by irreversible airway obstruction which is usually progressive and predominantly caused by smoking
What two conditions is COPD an umbrella term for
Emphysema and bronchitis
Define emphysema
Enlarged air spaces distal to terminal bronchioles, with destruction of alveolar walls
Define bronchitis
Inflammation of airways with cough, sputum production for most days for 3 months of 2 successive years
What is the difference between diagnosis of emphysema and bronchitis
Emphysema is defined histologically, bronchitis is defined clinically
What are the pathophysiological features of COPD
- mucous gland hyperplasia
- loss of filial function
- emphysema
- chronic inflammation (macrophages and neutrophils)
- fibrosis of small airways
List the causes of COPD
Smoking
a1-antitrypsin deficiency
Industrial exposure
What fev1 ranges indicate mild, moderate and severe COPD
Mild = 50-80% Mod = 30-49% Severe = less than 30%
How are patient sight COPD managed
- SMOKING CESSATION
- pulmonary rehab
- bronchodilators
- antimuscaricins
- steroids
- mucolytics
- Ltot if appropriate
- lung volume reduction if appropriate
What are the indications for lung vol surgery in patient with COPD
Recurrent pneumothorax
Bullous disease
How would you treat mild COPD
Antimuscarinic
Or B2 agonist PRN
How is moderate COPD managed pharmacologically
Regular antimuscarinic
Or LABA
+ inhaled corticosteroid e.g. Beclamethasone
How is severe COPD treated
LABA
+ inhaled steroid
+ anticholinergic
What may ecg and CXR show in a patient with COPD
Ecg : ra and rv hypertrophy
CXR: hyperinflation, flat hemidiaphragm, large central pulmonary arteries, bullae
How do you know that a lung is hyper inflated on CXR
More than 6 ribs in the MCL above the diaphragm
What are the medical features of pink puffers in COPD
Increased alveolar ventilation
Near normal pao2 with normal or slightly low paco2
Breathless
What are the medical features of blue bloaters in COPD
Decreased alveolar ventilation
Pao2 is decreased and paco2 is increased
Cyanosed but not breathless
Rely on hypoxia drive
Why do blue bloaters rely on hypoxic drive
Their respiratory centres have a decreased sensitivity to co2
What can blue bloaters go on to have
Cor pulmonale
What can pink puffers go on to have
Type 1 resp failure
Why may Ltot be given in a patient with severe COPD
To prevent renal and cardiac damage from prolonged hypoxia
How is Ltot (long term O2 therapy) given
Continuous oxygen therapy for most of the day - at least 16 hours/day for a survival benefit
At which po2 levels is Ltot offered in COPD patients
Po2 consistently below 7.3 kpa or below 8kpa with cor pulmonale
What are some of the drawbacks of Ltot
Reduced mobility and independence
Describe the cycle which pulmonary rehabilitation tries to break in patient with COPD
You feel breathless > avoid activity > do less > muscles weaken > get more breathless > feel depressed > you feel breathless
What adverse social effects can the vicious cycle of COPD lead to
Increasing isolation and inactivity, which leads to worsening of symptoms
What are some of the complications of COPD
Acute exacerbation Infections Polycythaemia Resp failure For pulmonale Cancer Bullae rupture leading to pneumothorax
What are the symptoms of COPD
Cough
Sputum
Wheeze
Dyspnoea
What are the signs of COPD
Tachypnoea Use of accessory muscles Hyperinflation of chest Reduced expansion Increased percussion note Cyanosis Quiet breath sounds Wheeze Cor pulmonale
What types of organism tend to cause hospital acquired pneumonia
- gram negative enterobacteria
- s aureus
- pseudomonas
- klebsiella
- bacteroides
- clostridia
Give some conditions that may predispose to aspiration pneumonia
Stroke Myasthenia gravis Bulbar palsies Decreased consciousness Oesophageal disease eg GORD Poor dental hygiene
List some organisms causing pneumonia in immune improvised patients
- pneumocystis jirovecii/P. Carinii
- fungi
- M. Catarrhalis
What are the common organisms causing community acquired pneumonia
- strep pneumoniae
- h influenzae
- mycoplasma pneumoniae
- viruses and flu also
What will be seen on CXR of patient with pneumonia
Consolidation
Lobar or multi lobar infiltrates
Cavitation
Pleural effusion
What are the differentials for consolidation on CXR
- pneumonia
- TB
- lung ca
- lobar collapse (blockage of bronchi)
- haemorrhage
What does a curb 65 score act as a guide for
Risk of mortality for patients with pneumonia
What other features, except for a high scoring curb 65 can increase risk of death in a patient with pneumonia
- coexisting disease
- bilateral involvement
- multi lobar involvement
- pao2
What investigation should you perform in a febrile patient with pneumonia
Blood cultures
In severe cases/high curb 65 score, what investigations would you do
Investigations for atypical causes e.g. Serology and urine legionella antigen test
On examination of a patient with pneumonia, what signs may you pick up?
signs of consolidation e.g.
- decreased percussion note
- diminished expansion
- bronchial breathing
- increased Fremitus
Give some of the steps of pneumonia follow up
- HIV test
- immunoglobulins
- pneumococcal IgG serotypes
- H influenzae B IgG
When would you do a follow up appointment and CXR in a patient with pneumonia
In 6 weeks
What factors may cause a non-resolving pneumonia (CHAOS)
Complications Host immunocompromised Antibiotic inadequate Organism resistant Second diagnosis - not pneumonia
List some of the complications of pneumonia
Empyema Lung abscess Resp failure Septicaemia Pericarditis, myocarditis Pleural effusion AF
What is the management of pneumonia usually
Amoxicillin + clarithromycin/doxycycline (look at hospital guidelines)
What is the treatment for aspiration pneumonia
Cefuroxime + metronidazole
What is the treatment for atypical pneumonia
Coamoxiclav or cefuroxime/other cephalosporin
+ clarithromycin
+ flucloxacillin (if S. aureus is indicated)
When treating a patient with pneumonia, what are your targets for pao2 and sats
Pao2 > 8kpa
Sats >94%
If a patient with penumonai becomes septic, who do you refer them to
ITU
What can precipitate hypotension in a patient with pneumonia
Dehydration and sepsis
Give a skin feature of TB
Erythema nodosum
Give non-chest manifestations of TB
Erythema nodosum, lymphadenopathy, meningitis, frequency, dysuria, pericardial effusion
By which route is TB spread to become milliary
Haematogenous
What is the characteristic CXR feature of TB
Reticulonodular shadowing, usually in upper zone
What is the tuberculin test
TB antigen is injected intradermally,
If it is positive, it indicates immunity
If it is strong positive, it indicates active infection
What may cause positive tuberculin test in a patient
Immunity - either previous exposure or BCG vaccination
What are some of the infective differential causes of haemoptysis
- pneumonia
- TB
- bronchiactesis
- CF
- cavitation lung lesion (e.g. Fungal)
What are some of the haemorrhagic differential causes for haemoptysis
- bronchial artery erosion
- PE
- vasculitis
- coagulopathy
List the differential diagnoses for haemoptysis
- infections (TB, pneumonia etc.)
- malignancy
- haemorrhagic
- PE
If there is a CXR suggestive of TB, what investigation would you do next
Sputum sample
If a patient has active non respiratory TB, which investigations would you choose to cover as much as possible
- sputum sample
- CXR
- pleural fluid
- urine sample
- pus
- csf
List some risk factors for TB
- past history of TB
- known history of TB contact
- born in country with high TB incidence
- travel to country with high TB incidence
- immunosuppression
What is the histological hallmark of TB
Caseating granuloma
How would you test for TB bacterium
Ziel Neelsen testing for acid fast bacilli
What are the CXR signs for a patient with TB
- consolidation
- cavitation
- fibrosis
- calcification
Should you wait for cultures results if histology and clinical picture is consistent with TB
No
If a patient with TB has a productive cough, what samples should you collect
Three sputum cultures for acid fast bacilli and TB culture
If you have a patient with suspected TB which has atypical features on examination and CXR, what investigation would you then do
Ct
If you are unsure between diagnosis of TB or p euro ka, how would you manage that patient
Which treatment as per pneumonia, while investigation possibility of TB
What is the standard therapy for TB
- 4 antibiotics for the first 2 months: Rifampicin, Isoniazid, Pyrazinamide, Ethambutol
- then followed by two antibiotics for the next 4 months: Rifampicin and isoniazid
Why is weight Important when treating a patient with TB
Dose of anti TB antibiotics depends on weight
Why do you need to check visual acuity before giving ethambutol
He drug causes ocular toxicity, so you need to test colour vision and acuity before commencing treatment
What is DOT
Directly observed therapy - observing patient staking anti TB meds to help with compliance
What drug can you give in conjunction with isoniazid to act as prophylaxis for peripheral neuropathy
Pyridoxine
What are the two major side effects of Rifampicin
Hepatitis
Orange /red secretions
What is the major side effects of isoniazid
Peripheral neuropathy