A randomised trial of ultrasound-facilitated, catheter-directed, thrombolysis versus anticoagulation for acute intermediate-high risk pulmonary embolism: The higher-risk pulmonary embolism thrombolysis study-HI-PEITHO

This study will assess two treatment options for pulmonary embolism (a clot in the blood vessels in your lung). One treatment using ultrasound guided thrombolysis and anticoagulation (procedures that break up blood clots). Compared with treatment with anticoagulation alone. Mortality (death), cardiorespiratory decompensation (reduced heart function) or collapse within 7 days will be assessed and compared.