Resp Flashcards
what is hospital acquired pneumonia
pneumonia that has occurred 48 hrs after hospital admission
common causes of community acquired pneumonia
streptococcus pneumoniae (!)
mycoplasma pneumoniae
haemophilus pneumoniae
atypical organisms that cause pneumonia
mycoplasma pneumoniae
legionella pneumophilia
chlamydia psittaci
chlamydia pneumoniae
common causes of hospital acquired pneumonia
staphylococcus aureus
pseudomonas aeruginosa
klebsiella
causes of aspiration pneumonia
anaerobes from gut flora
risk factors for pneumonia
smoking
recent travel
immunocompromised
faulty air conditioning (legionella)
pet birds (chlamydia psittaci)
pneumonia symptoms (typical)
fever
SOB
productive cough (yellow/green sputum)
pleuritic chest pain
pneumonia symptoms (atypical)
dry cough
headache
diarrhoea
myalgia
hepatitis
confusion (legionella)
pneumonia signs (typical)
resp distress
cyanosis
reduced chest expansion
dull percussion over areas of consolidation
basal coarse crepitus
bronchial breathing
increased vocal resonance
pneumonia signs (atypical)
mycoplasma pneumoniae
- transverse myelitis
- erythema multiforme
- associated with AIHA
legionella
- hyponatraemia
- abnormal LFTs
pneumonia investigations
sputum MCS
FBC (high WCC)
high CRP
ABG (type 1 resp failure)
pleural fluid MCS via thoracentesis
CXR (consolidation with fluid levels)
atypical:
blood film
urinary antigens
LFTs
what would cxr show for pneumonia
lobar pneumonia
- consolidation within one lobe
bronchopneumonia
- consolidation all over the lungs
how is pneumonia severity assessed
CURB-65
confusion
urea > 7mmol/L
resp rate > 30
BP <90
age >65
mx of pneumonia
depends on CURB-65 score
1 = GP + oral antibiotics
2 = A&E + IV antibiotics
3+ = hospital admission + IV antibiotics + consider ITU
community acquired pneumonia antibiotics
typical:
- amoxicillin
- co-amoxiclav if severe
atypical:
- clarithromycin
typically amoxicillin and clarithromycin are given together if causative organism not yet identified
hospital acquired pneumonia antibiotics
staph aureus:
- flucloxacillin
MRSA:
- vancomycin
pseudomonas:
- tazocin + gentamicin
anaerobes:
- metronidazole and amoxicillin
special considerations when prescribing for pneumonia
if pt has penicillin allergy give doxycycline
in HIV pts give co-trimoxazole
pneumonia differentials
bronchitis
bronchiectasis
lung cancer
complications of pneumonia
pleural effusion
sepsis
ARDS
acute bronchitis typical organisms
rhinovirus
parainfluenza
influenza A or B
respiratory syncytial virus
coronavirus
risk factors acute bronchitis
smoking
cystic fibrosis
COPD
acute bronchitis signs and symptoms
non-productive or minimally productive cough
dyspnoea
MILD fever
acute bronchitis investigations
diagnosis based on clinical presentation
maybe CXR
Mx in acute bronchitis
otherwise healthy pts:
- paracetamol and ibuprofen as required
- hydration
cough persisting > 2 wks:
- inhaled corticosteroids
- inhaled beta 2 agonist may be useful if wheeze
- antitussives if cough interfering with sleep
pts with underlying lung pathology:
- oral abx (7 days of amoxicillin or doxycycline)
acute bronchitis differentials
asthma
pneumonia
acute bronchitis complications
pneumonia
chronic bronchitis
sinusitis
pulmonary embolism risk factors
cancer, chemo, cardiac failure, COPD, factor c deficiency
trauma, thrombocytosis, travel
stasis, surgery, factor S deficiency
varicose veins, virchow’s triad, factor V Leiden
pill (OCP), pregnancy, previous VTE, polycythaemia, paraprotein deposition
signs and symptoms of PE
depends on severity
pleuritic chest pain
dyspnoea
collapse if severe
central crushing pain
haemoptysis
CXR can show Westermark’s sign
what would ecg show PE
S1Q3T3 pattern
right axis deviation
right bundle branch block
sinus tachycardia
PE ix
depends on wells score
wells score < 4:
low risk, d-dimer
wells score 4+:
high risk, CTPA (except if pregnant)
PE Mx
depends on whether pt is haemodynamically stable
stable:
(subacute/ chronic)
- resp support
- anticoagulation
> fondaparinux/heparin for 5 days
> warfarin for 3 months
unstable:
SBP <90
(massive PE)
- resp support
- 1st line: thrombolysis
- 2nd line: embolectomy
IV thrombolytics: alteplase, streptokinase, rt-PA
VTE prevention
everyone must be VTE assessed within 24 hrs of hospital admission
compression stockings (TED stockings)
LMWH (eg tinzaparin)
classifying pneumothorax
traumatic: damage to parietal pleura
spontaneous: damage to visceral pleura
primary: young and otherwise healthy pt
secondary: pre-existing lung pathology, elderly
risk factors pneumothorax
male
smoking
Marfan’s
pneumothorax Ix
CXR
- look for loss of lung markings
FBC, clotting screen
- correct clotting abnormalities before inserting chest drain
pneumothorax Mx
primary:
<2cm, no SOB: discharge and OPD review
>2cm or SOB: needle aspirate
- aspiration unsuccessful: chest drain
- aspiration successful: observe + O2
secondary:
<1cm, no SOB: observe + O2
1cm-2cm, no SOB: needle aspirate:
- aspiration unsuccessful: chest drain
- aspiration successful: observe + O2
>2cm or SOB: chest drain
Tension pneumothorax signs and symptoms
MEDICAL EMERGENCY
lung compression
- severe dyspnoea
- tracheal deviation away from lesion
- silent chest, hyperresonance, reduced expansion
mediastinal shift
- hypotension
- tachycardia
Mx of tension pneumothorax
insert large bore cannula (orange or grey) in 2nd ICS, MCL just above 3rd rib to avoid neurovascular bundle of the 2nd rib
What is ARDS (+Berlin’s criteria)
non-cardiogenic pulmonary oedema
Berlin’s criteria:
- no alternative cause for pulmonary oedema
- rapid onset < 1 week
- dyspnoea
- bilateral signs on CXR
Causes of ARDS
hypoxaemic acute lung injury:
- sepsis
- pneumonia
- ventilation
- severe burns
- acute pancreatitis
- transfusion reactions
- drug overdose
- COVID-19
body responds with profound inflammatory response
- vascular permeability increased
- alveolar collapse
ARDS Ix
bilateral diffuse opacities on chest x-ray
ABG (type 2 resp failure)
sputum culture
blood culture
ARDS Mx
refer to ICU
ventilator
intubation
draining effusions
consider proning to improve oxygenation
what receptor does SARS-CoV-2 bind to
ACE2
covid symptoms
dyspnoea
fever
altered smell and taste
headache
GI disturbances
covid Ix
RT-PCR: +ve for viral DNA
pulse oximetry: low o2 sats
bloods: ABG, FBX, TFTs, glucose, CRP, ESR, cardiac biomarkers, coagulation screen, u+e
CXR,CCT: ground glass opacity, consolidation
covid Mx
mild/moderate: bed rest, paracetamol, ibuprofen, hydration, monitor O2 sats
severe: hospital admission, O2 therapy, VTE prophylaxis, dexamethasone, remdesivir, IL-6 inhibitor, consider ICU for ventilation, JAK inhibitor, ECMO