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Flashcards in VTED Deck (15)
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What is meant by Virchow's triad?

Causes of thrombosis:
- Abnormalities in blood flow
- Abnormalities in blood components
- Abnormalities in the vessel wall


What are the signs and symptoms of a PE?

Sudden onset
Shortness of breath
Pleuritic chest pain
Low sats


What investigations should be carried out for a suspected PE?

CXR and ECG to rule out other causes of SOB and chest pain
Calculate Wells score
If likely (Wells above 4)- CTPA
If unlikely - D-dimer, if positive - CTPA
FBC, U&Es, baseline clotting


What are the key features of a massive a PE?

Hypotension/imminent cardiac arrest
Signs of right heart strain on CT/ECHO, ECG
Consider thrombolysis with IV alteplase


What are the key steps in the management of a PE?

Oxygen if hypoxic
Fluid resus if hypotensive
Thrombolysis if massive PE with Alteplase
Fully anticoagulated - therapeutic LMWH with SC Dalteparin (weight-dependent - ask for trust guidelines) until INR above 2 or for five days (which ever comes first) then switch to Warfarin - continue for at least 3 months (if provoked, longer period of anti-coagulation if unprovoked, if provoked due to cancer LMWH for 6 months)


What are the complications of thrombolysis?

Haemorrhagic stroke
Reperfusion arrhythmias
Allergic reactions


What are the absolute contraindications of thrombolysis?

Haemorrhagic or ischaemic stroke in the past 6months
CNS neoplasia
Recent trauma or surgery
GI bleed in the previous month
Bleeding disorder
Aortic dissection


Outline the Wells criteria for the scoring of a suspected PE

Clinical signs and symptoms +3
PE is number 1 Dx +3
HR > 100 +1.5
3 days of immobilisation (bedbound) or surgery with GA in the past month +1.5
Previous VTED +1.5
Haemoptysis +1
Malignancy +1
PE likely if 4.5 or more


What are the contraindications for CTPA?

Decreased kidney function


What happens in a VQ scan?

Assesses the ventilation:perfusion ratio to establish whether the pulmonary circulation has been interrupted
In PE, perfusion is decreased


What are the risk factors for VTED?

Previous lower limb orthopaedic surgery
Recent major +/- abdominal surgery
Previous VTED
Use of HRT
O&G - third trimester, up to 6 weeks post partum, pre-eclampsia
Fracture, varicose veins, reduced mobility


What are the presenting symptoms of a DVT?

What investigations are needed?

Sudden onset localised leg pain
Increased temperature
Unilateral calf tenderness


What is the Wells score for DVT?

2+ DVT likely, one point for each of the following
Active cancer
Paralysis, paresis, or recent plaster immobilisation LL
Recently bedridden 3/7 or major GA surgery in past 12/52
Local tenderness along venous system distribution
Entire leg swollen
Calf swelling > 3cm more than unaffected side
Pitting oedema
Collateral superficial veins
Previous DVT


What further testing should be considered following an unprovoked VTE?

Inherited thrombophilias: factor V Leiden mutation and prothrombin G20210A mutations can be checked at the time of thrombosis

Anti-thrombin 3, protein C and protein S deficiencies should be performed after the event. They are depressed at the time of acute thrombosis and by Heparin and Warfarin

CT abdomen and pelvis looking for pelvic malignancy


What are the appropriate initial investigations in suspected DVT?

Wells score
If likely - proximal leg vein ultrasound scan
If unlikely - D-dimer- if positive - ultrasound scan