Pneumonia Flashcards
What are the 2 lower resp tract infections?
Pneumonia and TB
What is pneumonia?
Fluid exudation into alveoli due to inflammation; from INFECTION
What causes pneumonia?
Typically bacterial, can be viral
Can be CAP (Community acquired pneumonia) or
HAP (Hospital acquired pneumonia)
CAP is found where?
In community or <48 hours in hospital
What can cause CAP?
overall
Bacteria
viral
Fungi
Which Bacteria cause CAP?
3 main ones
S.Pneumoniae - (MC Cause)
H. Influenzae
Mycoplasma pneumonae - (causes atypical pneumonia)
What other bacteria also cause CAP?
S. aureus
Legionella (typically comes from SPAIN or associated with air conditioning)
Moraxella
Chlamydia Pneumoniae (atypical pneumonia)
2 Viral causes of CAP?
H.Flu
CMV
What is the fungal cause of CAP?
Who is it specifically found in?
P. Jirovecii
(in immunocompromised only - HIV)
PCP is AIDS defying illness
HAP is found where?
> 48 hours of hospital admission
What causes HAP?
General
Bacteria
Bacteria that cause HAP?
P. auruginosa
E. coli
Klebsiella
(these 3 all gram -ve aerobic bacilli)
MRSA
Are HAP bacteria more or less severe and why?
HAP are more severe as many of these are drug resistant (MDR)
How do these pathogens enter the Px?
Typically from inhaled pathogens, also can be from aspiration
RF for pneumonia?
Immunocompromised (HIV, long term steroids)
IV DU (S.aureus)
Resp, pre existing disease
very old/young
Pathology of typical pneumonia
Bacteria invades + exudate forms inside alveoli lumen + sputum
Pathology of atypical pneumonia?
Bacteria invade + exudate forms In interstitial of alveoli + dry cough (mycoplasma pneumoneae)
Sx of pneumonia
Productie cough with rusty coloured sputum (purulent = pus)
Pyrexic (high temp) - due to infection
Pleuritic chest pain - worse when breathing and coughing
Tachypnoea and dyspnoea (tachy + hypo)
Confusion in elderly
If atypical, what Sx seen?
Dry cough and low grade fever
Dx for pneumonia ?
1st line?
diagnostic?
1st line + diagnostic = Chest X ray shows consolidation - ‘airbronchogram’ - fluid filled surrounding alveoli
Diagnostic sign - Airfield bronchi made visible by pacified fluid filled surrounding alveoli
Sputum sample + culture 10 organisms (gram stain, Ziehl Neelsen stain)
On chest x ray for pneumonic lesions, what would be seen in diff organisms?
Multilobar = S. pneumoniae, S.aureus, Legionella
Multiple abscesses = s.aureus
upper lobe = Klebsiella but exclude TB FIRST
For CAP to assess the severity, what acronym is used and what does it stand for?
CURB 65
Confusion
Urea nitrogen >7mmol/L
RR >30
BP <90/60mmHg (<90 sys or <60 dias)
65+ y/o
Scored out of?
what is the Tx for each score?
5
1. 3% mortality, out Px, oral Abx + discharge
2. Consider short hospital stay + Abx
>3. 15% mortality, HOSPITAL (ICU) + IV Abx
General Tx for pneumonia
O2 (sats 94-98%) unless COPD
Broad spec Abx
Analgesia (NSAIDS) for pleuritic chest pain
Abx for CAP :
CURB 0-2
CURB 3-5
Except which bacteria, what is the 1st line for and what else about the bacteria?
CURB 0-2 = Amoxicillin
CURB 3-5 = Coamoxiclav + clarythromycin
Except legionella
1st line = clarythromycin
Notifiable disease to Public Health England
Aspiration pneumonia?
seen in Px with?
what is it?
seen in Px with stroke, bulbar palsy, MG
Aspiration of gastric contents into lungs, can be fatal due to destructiveness of gastric acid