rtPA Not a Matter of the Past
In high-risk PE, the therapeutic priority is rapid hemodynamic stabilization and restoration of pulmonary blood flow to prevent cardiovascular collapse. Systemic thrombolysis acts quickly, reducing pulmonary vascular resistance and obstruction within hours, said Dr. Sanchez.
Presenting at the ERS Congress, he reported numerous studies, including 15 randomized controlled trials that demonstrated its effectiveness in high-risk PE. The PEITHO trial, in particular, demonstrated the ability of systemic thrombolysis to reduce all-cause mortality and hemodynamic collapse within 7 days.
However, this benefit comes at the cost of increased bleeding risk, including a 10% rate of major bleeding and a 2% risk for intracranial hemorrhage. “These data come from old studies using invasive diagnostic procedures, and with current diagnostic procedures, the rate of bleeding is probably lower,” Dr. Sanchez said. The risk of bleeding is also related to the type of thrombolytic agent, with tenecteplase being strongly associated with a higher risk of bleeding, while alteplase shows no increase in the risk of major bleeding, he added. New strategies like reduced-dose thrombolysis offer comparable efficacy and improved safety, as demonstrated in ongoing trials like PEITHO-3, which aim to optimize the balance between efficacy and bleeding risk. Dr. Sanchez is the lead investigator of the PEITHO-3 study.
While rtPA might not be optimal for all patients, Dr. Sanchez thinks there is not enough evidence to replace it as a first-line treatment.
Existing studies on catheter-directed therapies often focus on surrogate endpoints, such as right-to-left ventricular ratio changes, rather than clinical outcomes like mortality, he said. Retrospective data suggest that catheter-directed therapies may reduce in-hospital mortality compared with systemic therapies, but they also increase the risk of intracranial bleeding, post-procedure complications, and device-related events.
Sanchez mentioned the same FLAME study described by Dr. Rali, which reported a 23% rate of device-related complications and 11% major bleeding in patients treated with catheter-directed therapies.
“Systemic thrombolysis remains the first treatment of choice,” Dr. Sanchez concluded. “The use of catheter-directed treatment should be discussed as an alternative in case of contraindications.”
The Debate Continues
Numerous ongoing clinical studies, such as the FLARE trial, will address gaps in evidence and refine treatment protocols, potentially reshaping the standard of care in high-risk PE in the near future by providing new data on the efficacy and safety of existing and emerging therapies.
“The coming data will make it clearer what the best option is,” said Thamer Al Khouzaie, MD, a pulmonary medicine consultant at Johns Hopkins Aramco Healthcare in Dhahran, Saudi Arabia. For now, he said, systemic thrombolysis remains the best option for most patients because it is widely available, easily administered with intravenous infusion, and at a limited cost. Catheter-directed treatment and surgical options are only available in specialized centers, require expertise and training, and are also very expensive.
Dr. Rali, Dr. Sanchez, and Dr. Khouzaie report no relevant financial relationships.
A version of this article appeared on Medscape.com.