Defined as the presence of pus in the pleural space.
Risk factors include pneumonia, iatrogenic intervention in the pleural space, diabetes, and alcohol abuse.
In patients with symptoms and signs of infection and a significant pleural effusion, thoracentesis (pleural aspiration) must be performed urgently.
If empyema or a complicated parapneumonic effusion is diagnosed, a chest drain must be inserted urgently.
A prolonged course of antibiotics is also required.
If patients do not improve with antibiotics and drainage of the pleural space, surgery or fibrinolytics should be considered.
Mortality is approximately 15% to 20%.
Empyema is defined as the presence of frank pus in the pleural space.  Parapneumonic effusions are effusions caused by an underlying pneumonia. A simple parapneumonic effusion is not infected, whereas a complicated parapneumonic effusion develops once infection has spread to the pleural space. These 3 conditions represent a spectrum of pleural inflammation in response to infection, ranging from a simple parapneumonic effusion to empyema.
ADP declares that she has no competing interests.
RLR declares that she has no competing interests.
Respiratory Research Registrar
NMR declares that Roche UK supplied clinical trial supplies and funding for the MIST2 trial that he conducted.
Dr Athanasia D. Pataka, Dr Renata L. Riha, and Dr Najib M. Rahman would like to gratefully acknowledge Dr Eleanor K. Mishra, a previous contributor to this topic.
EKM declares that she has no competing interests.
Professor of Medicine and Director
Division of Pulmonary/Critical Care/Allergy/Sleep Medicine
Medical University of South Carolina
SS declares that he has no competing interests.
Senior Lecturer and Consultant Physician
North Bristol Lung Centre
NM declares that he has no competing interests.
Consultant Chest Physician and Senior Lecturer
Oxford Centre for Respiratory Medicine and University of Oxford Churchill Hospital
YCGL declares that he has no competing interests.
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