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Patient meet 23 yr old male with case of road traffic accident with liver injury with right mid shaft femur fracture with right mid shaft tibial fracture with medial malleolus fracture as thromboembolic complication what advice md medicine resident should put on reference sheet by ortho department

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trauma venous thromboembolism prophylaxis

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Western Trauma Association venous thromboembolism prophylaxis solid organ injury liver trauma LMWH guideline

Suggested Medicine referral / advice sheet
23-year-old male, post-RTA with liver injury and right mid-shaft femur fracture, right mid-shaft tibial fracture, and medial malleolus fracture. He is immobilized and has high risk for venous thromboembolism (DVT/PE). Kindly assess for and advise thromboprophylaxis, balancing this against bleeding risk from liver trauma.
Request:
  1. Assess haemodynamic stability and ensure there is no ongoing intra-abdominal bleeding.
  2. Review Hb trend, platelet count, PT/INR, aPTT, renal function, liver injury grade/management plan, and planned operative procedures.
  3. Start mechanical prophylaxis immediately, if no contraindication:
    • Intermittent pneumatic compression on the uninjured limb if feasible.
    • Early mobilization/ankle and toe exercises when orthopaedically permitted.
  4. If haemostasis is secure, Hb is stable, no active bleeding/transfusion requirement, and trauma/surgery team agrees, advise pharmacological VTE prophylaxis with LMWH:
    • Common trauma regimen: enoxaparin 40 mg SC every 12 hours in adults with adequate renal function.
    • Adjust dose/agent for renal impairment, low body weight/obesity, thrombocytopenia, or other bleeding risks as per institutional protocol.
    • Do not start or continue during active bleeding, worsening Hb, haemodynamic instability, significant coagulopathy, or before a procedure as directed by the operating team.
  5. In liver injury, early LMWH may be considered once bleeding is controlled. Trauma guidance supports initiation within 24-48 hours in selected stable solid-organ-injury patients, but grade IV-V liver injuries require particular caution and trauma-surgery approval. The WTA trauma algorithm notes early prophylaxis can be safe in many stable liver injuries, while the WSES liver-trauma guideline supports LMWH as soon as safely possible.
  6. Monitor daily for bleeding and VTE:
    • Bleeding: fall in Hb, tachycardia/hypotension, abdominal distension/pain, wound bleeding, melena/hematemesis.
    • DVT: unilateral leg swelling, pain, warmth.
    • PE: unexplained tachycardia, hypoxia, pleuritic chest pain, dyspnoea, syncope.
  7. If DVT/PE is clinically suspected, obtain appropriate imaging urgently and discuss therapeutic anticoagulation versus temporary IVC filter with Trauma Surgery/Medicine. An IVC filter is not routine prophylaxis and is generally reserved for selected patients with confirmed VTE who cannot receive anticoagulation.
One-line note for the chart:
High VTE-risk polytrauma with long-bone fractures and immobilization. Kindly advise timing and regimen of LMWH thromboprophylaxis after confirming stable liver injury/no active bleeding; mechanical prophylaxis to continue meanwhile.

How can we rule out thromboembolic complications

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trauma venous thromboembolism diagnosis

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ACR Appropriateness Criteria suspected lower extremity DVT trauma duplex ultrasound pulmonary embolism CTPA diagnosis guideline

In this high-risk polytrauma patient, do not use D-dimer to rule out VTE. Trauma, fractures, surgery, and liver injury commonly elevate D-dimer, so it is not useful for excluding DVT/PE in hospitalised trauma patients.

1. Screen clinically at least daily

Look for:
  • DVT: new asymmetric leg swelling, calf/thigh tenderness, warmth, increased limb circumference, unexplained pain, superficial venous dilatation.
  • PE: unexplained tachycardia, hypoxaemia, sudden dyspnoea, pleuritic chest pain, syncope, hypotension, raised respiratory rate.
  • Check SpO₂, pulse, respiratory rate, BP and examine both limbs daily.
Clinical signs alone cannot reliably exclude VTE, especially with fractures and splints.

2. To rule out DVT

Bilateral lower-limb venous duplex/compression Doppler ultrasonography is the first investigation if symptoms/signs occur or there is unexplained deterioration. It is the preferred first-line test for suspected lower-extremity DVT according to ACR imaging guidance.
Practical request:
Bilateral lower-limb venous duplex Doppler to rule out proximal DVT in a high-risk immobilised polytrauma patient with right femur and tibia fractures.
Important limitation: ultrasound may be technically difficult or incomplete on the fractured/splinted limb, and a negative scan does not fully exclude an isolated calf or pelvic-vein thrombus. If clinical suspicion remains high despite a negative/inadequate scan, repeat duplex in about 5-7 days or discuss CT/MR venography with Radiology/Medicine.

3. To rule out pulmonary embolism

If there is unexplained hypoxia, tachycardia, dyspnoea, chest pain, syncope, or haemodynamic instability:
  • ABG and ECG: supportive only, not diagnostic.
  • Chest X-ray: looks for alternative causes but cannot exclude PE.
  • CT pulmonary angiography (CTPA): first-line definitive test in a stable patient, provided renal function and contrast use are acceptable.
  • V/Q scan: alternative if CTPA contrast is contraindicated, such as severe renal dysfunction or contrast allergy.
  • Bedside echocardiography: in unstable patients, assess RV strain and alternative causes of shock. It does not reliably exclude PE in stable patients.
  • Simultaneously obtain lower-limb duplex Doppler. A proven proximal DVT in a patient strongly suspected to have PE may guide management if CTPA cannot be performed.
A normal CTPA in an appropriately investigated patient generally excludes clinically important acute PE. Murray & Nadel’s Textbook of Respiratory Medicine, “Diagnosis of Pulmonary Embolism,” lines 3984-3996.

4. Do not do routine CT/CTPA or serial Doppler in an asymptomatic patient

Routine screening imaging in every trauma patient is generally not the approach. Use vigilant clinical monitoring and image promptly when symptoms, signs, or unexplained physiological deterioration develop. The priority meanwhile is appropriate VTE prophylaxis once bleeding from the liver injury is controlled.

5. Also consider fat embolism syndrome

With femur and tibial shaft fractures, sudden hypoxia may also be due to fat embolism syndrome, especially 24-72 hours after trauma. Think of it if there is the triad of:
  • Respiratory distress/hypoxaemia
  • Neurological alteration
  • Petechial rash, often on chest, axillae, conjunctivae
CTPA may be negative in fat embolism. This is a clinical diagnosis of exclusion and needs urgent Trauma/ICU review.

Suggested chart note

Patient is at high risk for VTE due to long-bone fractures, polytrauma and immobilisation. D-dimer is not interpretable in the present trauma setting. Monitor daily for clinical evidence of DVT/PE. If limb swelling/pain occurs, obtain bilateral lower-limb venous duplex Doppler. If unexplained hypoxaemia, tachycardia, dyspnoea, chest pain or haemodynamic instability develops, obtain urgent CTPA if stable and no contrast contraindication; bedside echocardiography plus duplex Doppler if unstable. Consider fat embolism syndrome if hypoxaemia/neuro signs/petechiae occur after long-bone fracture.
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