RESUMEN

BACKGROUND: Thrombolysis is recommended in the setting of massive pulmonary embolism (PE) for reperfusion of vessels but carries a serious concern for increased bleed risk. In October 2022, our institution adopted tenecteplase as the formulary thrombolytic. Previous literature is unclear regarding the bleed risk of tenecteplase in massive PE, and no study has yet compared safety outcomes with the current standard of care, alteplase. OBJECTIVE: The objective of this study was to compare the incidence of bleeding with tenecteplase versus alteplase in massive PE patients. METHODS: This was a retrospective, observational cohort study that included adults who received tenecteplase or alteplase for massive PE. The primary outcome was major bleeding as defined by the International Society on Thrombosis and Hemostasis (ISTH). Secondary outcomes included incidence of symptomatic intracranial hemorrhage (ICH), in-hospital mortality, administration of reversal agents, and length of stay. RESULTS: A total of 44 patients met inclusion criteria with 20 patients in the alteplase cohort and 24 in the tenecteplase cohort. Seventeen percent of tenecteplase patients compared with 5% of alteplase patients experienced bleeding. The mortality rate was 83% vs 75%, respectively. In addition, 1 patient in the tenecteplase cohort experienced a symptomatic ICH and 2 patients required initiation of massive transfusion protocol. CONCLUSION AND RELEVANCE: Although this study was limited in sample size, these results suggest that there may be reason for concern of higher bleeding rates in patients treated with tenecteplase in the setting of massive PE.