Fat Embolism Syndrome Recognition & Management

Algorithm Steps

1. ▶

   Start

   Suspected Fat Embolism Syndrome

   Respiratory/neurological symptoms 24-72h post-fracture

   1. ●

      Action

      High-Risk Scenarios

      Identify patients at risk

      • Long bone fractures (femur, tibia)
      • Multiple fractures
      • Pelvic fractures
      • Intramedullary nailing
      • Orthopedic procedures
      • Liposuction (rare)
      • Young adults most commonly affected
      1. ●

         Action

         Classic Clinical Triad

         Onset typically 24-72 hours post-injury

         • 1. Respiratory: Hypoxemia, tachypnea, dyspnea (95%)
         • 2. Neurological: Confusion, agitation, drowsiness, coma (60%)
         • 3. Petechiae: Upper body, axillae, conjunctivae (50%)
         • May have fever, tachycardia
         • Symptoms develop insidiously
         1. ◆

            Decision

            Apply Gurd's Diagnostic Criteria

            Major and minor criteria

            • MAJOR CRITERIA:
            • - Petechial rash
            • - Respiratory symptoms + bilateral infiltrates
            • - CNS signs unrelated to head injury
            • MINOR CRITERIA:
            • - Tachycardia >110
            • - Fever >38.5°C
            • - Retinal fat emboli on fundoscopy
            • - Fat in urine/sputum
            • - Drop in Hct or platelets
            • - Elevated ESR
            • Diagnosis: 1 major + 4 minor, OR 2 major
            1. ●

               Action

               Investigations

               No specific diagnostic test

               • ABG: Hypoxemia (PaO2 <60 mmHg)
               • CXR: Bilateral diffuse infiltrates ('snowstorm')
               • CT chest: Ground glass opacities
               • CBC: Thrombocytopenia, anemia
               • Lipase: May be elevated
               • Fundoscopy: Retinal fat emboli (pathognomonic but rare)
               • Urine/sputum: Fat globules (non-specific)
               • MRI brain: T2 hyperintensities if neurological
               1. ◆

                  Decision

                  Severity Assessment

                  Determine level of care needed

                  1. ●

                     Action

                     Mild-Moderate FES

                     Supportive care, close monitoring

                     • Supplemental oxygen to maintain SpO2 >92%
                     • Monitor closely for deterioration
                     • Fluid management (avoid overload)
                     • Analgesia for comfort
                     1. ●

                        Action

                        Supportive Treatment

                        No specific therapy proven

                        • Maintain adequate oxygenation
                        • Maintain intravascular volume (careful balance)
                        • DVT prophylaxis
                        • Early mobilization when stable
                        • Albumin infusion (theoretical benefit, unproven)
                        • Steroids: Not routinely recommended
                        1. ⚠

                           Warning

                           ⚠️ Prognosis

                           Usually self-limiting but can be fatal

                           • Most patients recover with supportive care
                           • Mortality 5-15% in severe cases
                           • Neurological symptoms usually reversible
                           • ARDS may require prolonged ventilation
                           • Prevention is key: early fracture fixation
                        2. ●

                           Action

                           Ongoing Monitoring

                           Assess for improvement or complications

                           • Serial ABGs/SpO2 monitoring
                           • Repeat CXR if deteriorating
                           • Neuro checks if CNS involvement
                           • Watch for ARDS development
                           • Typically resolves in 2-7 days
                           1. ✓

                              Outcome

                              Recovery

                              Usually complete recovery expected

                           2. ✓

                              Outcome

                              Complications

                              ARDS, prolonged ICU stay, rare mortality

                  2. ●

                     Action

                     Severe FES / Fulminant

                     ICU admission required

                     • ICU monitoring
                     • Mechanical ventilation if respiratory failure
                     • Lung-protective ventilation (low tidal volume)
                     • PEEP for alveolar recruitment
                     • May progress to ARDS
                     • Inotropic support if needed
                     1. ●

                        Action

                        Early Fracture Fixation

                        Prevention and treatment

                        • Early fixation (<24h) may reduce FES risk
                        • Damage control orthopedics if polytrauma
                        • Avoid reaming in high-risk patients
                        • External fixation as temporizing measure
                        • Definitive fixation when stable
            2. ●

               Action

               Differential Diagnosis

               Rule out other causes

               • Pulmonary embolism (VTE)
               • ARDS from trauma/sepsis
               • Hospital-acquired pneumonia
               • Head injury (for neurological symptoms)
               • Drug/medication effects
               • Cardiogenic pulmonary edema