Fat embolism syndrome
Revision as of 02:36, 30 January 2015 by Kghaffarian (talk | contribs) (created Fat Embolism Syndrome)
Background
- caused by fat globules in pulmonary microcirculation
- fat is prothrombotic and pro-inflammatory
- commonly associated w orthopedic fractures, esp long bone fractures of lower extremities (eg. femur)
- men>women, highest rates: ages 10-40 y/o
Clinical Features
- multi-system dysfunction
- Classic triad: hypoxemia, neurological abnormalities and petechiae
- neuro findings included: focal deficits, AMS, coma
- thrombocytopenia and anemia common
- can progress to DIC
- Fulminant cases: RV dysfunction, biventricular failure, ARDS, shock, death
- Other etiologies (uncommon): pancreatitis, sickle cell crisis, alcoholic liver ds, bone marrow harvest/transplant/liposuction
Differential Diagnosis
- pulmonary embolism
- ARDS
- pulmonary edema
- alveolar hemorrhage
- other causes of hypoxemia
- other causes of shock
Workup
-clinical diagnosis, no gold standard
Gurd's Criteria
- Most frequently cited diagnostic criteria
- Need 1 major, 4 minor
Major
- Petechial rash,
- Resp symptoms w XR changes,
- CNS signs unrelated to another condition
Minor
- tachycardia
- pyrexia
- retinal changes (fat or petechiae)
- renal abnormalities (oliguria, anuria or lipiduria)
- thrombocytopenia
- acute anemia
- elevated ESR
- fat globules in sputum
- Chest Xray/CT scan chest
- Bilateral patchy infiltrates
- MRI brain: star-field pattern of diffuse, punctate, hyperintense lesions on DWI
- Bronchoalveolar lavage
- 30% of alveolar cells staining for fat strongly asso w diagnosis
Management
- Supportive care
- Heparin and steroids have not shown improvement
- Supplemental O2, mechanical ventilation if needed
- Frequent neurochecks, consider ICP monitoring
- Vasopressors as needed
- Refractory hypotension/shock: consider ECMO
Prevention
- Decreased incidence with orthopedic repair w/i 24h
- Consider prophylactic corticosteroids in pts w/ long bone fractures
- decreased hypoxemia, no difference in mortality
Disposition
-ICU
See Also
External Links
Sources
Kosova, E. et al. Fat Embolism Syndrome. Circulation. 2015; 131:317-320