Successful low-dosage thrombolysis of massive pulmonary embolism in primigravida: A case report

Reduced-Dose Thrombolysis in Acute Pulmonary Embolism A Systematic Review

Pulmonary embolism (PE) is the third-leading cause of cardiovascular mortality and the second-leading cause of death in cancer patients. The clinical efficacy of thrombolysis for acute PE has been proven, yet the therapeutic window seems narrow, and the optimal dosing for pharmaceutical reperfusion therapy has not been established. Higher doses of systemic thrombolysis inevitably associated with an incremental increase in major bleeding risk. To date, there is no high-quality evidence regarding dosing and infusion rates of thrombolytic agents to treat acute PE. Most clinical trials have focused on thrombolysis compared with anticoagulation alone, but dose-finding studies are lacking. Evidence is now emerging that lower-dose thrombolytic administered through a peripheral vein is efficacious in accelerating thrombolysis in the central pulmonary artery and preventing acute right heart failure, with reduced risk for major bleeding. The present review will systematically summarize the current evidence of low-dose thrombolysis in acute PE.

Thrombolysis in massive and submassive pulmonary embolism during pregnancy and the puerperium: a systematic review

Thrombolysis in high-risk pulmonary embolism (PE) patients is recommended worldwide; however, the evidence for thrombolysis during pregnancy and the immediate puerperium remains unclear. We conducted a systematic review from 1950 to 2019 through PubMed, Ovid/Willey, and Cochrane Library to assess the safety and effectiveness of thrombolysis during pregnancy and the immediate puerperium. Additionally, we characterized the clinical presentation, risk stratification, and diagnostic approach. We have communicated our results according to the PRISMA statement. We collected 141 records and, after critical assessment, included 47 case reports of 54 patients, including 43 and 11 patients during pregnancy and puerperium, respectively. During pregnancy, alteplase was the most frequent systemic thrombolytic agent used (67%), but only nine patients received the approved FDA regimen. With catheter-directed thrombolysis, low-dose thrombolytics and fragmentation were the most common regimens. Major bleeding occurred in 18% of cases, but there was no intracranial bleeding. One maternal death occurred secondary to refractory cardiogenic shock. Fetal mortality was 20%. During the immediate puerperium, nine patients received "off-label" first-, second-, and third-generation thrombolytic regimens, and four cases underwent catheter-directed thrombolysis. We observed nine major bleeding events, seven of which were from the uterine location and none of which were intracranial. In conclusion, overall, these data do not suggest prohibitive risk associated with thrombolysis for PE in pregnancy. Management of massive and high-risk submassive PE in pregnancy should be individualized to each patient. In the data presented, no fatal bleeding or intracranial bleeding was observed. Finally, future efforts should systematically collect and report data on high-risk PE in pregnancy and peripartum patients to improve the evidence-base clinical practice.