Pneumonia

Pneumonia
Definition : An acute infection of the pulmonary parenchyma that is associated with at least some symptoms of acute infection, accompanied by an acute new infiltrate on CXR or auscultatory findings consistent with pneumonia
Classification:
1- Etiological :
A- Infection:
I- Bacterial
II- Viral
III- Fungal
IV- Other
Typical verses atypical
atypical Typical Variable
Less acute proceeded by flue or URTI Acute Onset
Mostly
Mycoplasma
Chlamydia
Legionella Classical bacteria mostly
Pneumococcus Cause
Less High Inflammatory markers
Interstitial lobar CXR
Teenage & young adult any age
Walking pneumonia more Severity
B- Chemical as drugs or occupational exposure
C- Inhalational as aspiration
D- Immune as cryptogenic organizing pneumonia or eosinophilic pneumonia

2- Radiological :
A- Lobar : the consolidation involve the entire lobe or segment limited by the fissure.
B- Bronchopneumonia the bronchial wall & the surrounding alveoli are involved lead to bilateral consolidation nodules isolated or confluent with inter-spacer normal lung tissue.
C- Interstitial pneumonia: the interstitial tissue is inflamed causing reticular shadow mostly bilateral & basal
3- Location of acquiring :
A- Community acquired pneumonia: pneumonia acquired outside a hospital or long-term care facility
B- Hospital acquired pneumonia: or nosocomial pneumonia, is a lower respiratory infection that was not incubating at the time of hospital admission and that presents clinically 48 hours or more after hospitalization.
C- Healthcare associated pneumonia: pneumonia in non-hospitalized patients who had significant experience with the healthcare system. Such contact could include (1) intravenous antibiotics therapy within the preceding 30 days (2) residence in a long-term care facility (3) hospitalization in an acute-care hospital within the preceding 90 days (4) outpatient treatment in a hospital or hemodialysis clinic within the preceding 30 days.
D- Ventilator associated pneumonia: as pneumonia that present