NICE encourages further research into ultrasound-enhanced, catheter-directed
thrombolysis for pulmonary embolism. Ideally this should include comparative studies against catheter-directed thrombolysis alone. Patient selection should be documented. The dose of thrombolytic agent used and the duration of thrombolysis should be reported, together with all complications. Outcome measures should include the success of thrombolysis (complete, partial or failed) and long-term sequelae. NICE may update the guidance on publication of further evidence.