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Thrombolytic therapy for pulmonary embolism.

Qiukui Hao1, Bi Rong Dong, Jirong Yue

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Thrombolytic therapy for pulmonary embolism (PE) may reduce death and clot recurrence but increases bleeding risks. More high-quality trials are needed to confirm safety and cost-effectiveness.

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Area of Science:

  • Cardiology
  • Pulmonology
  • Pharmacology

Background:

  • Thrombolytic therapy is typically reserved for severe pulmonary embolism (PE).
  • Evidence suggests thrombolytics may dissolve clots faster than heparin, potentially reducing PE-related mortality.
  • Concerns exist regarding increased risks of major or minor hemorrhages with thrombolytic use.

Purpose of the Study:

  • To assess the efficacy and safety of thrombolytic therapy in patients diagnosed with acute pulmonary embolism.
  • To compare thrombolytic therapy plus heparin versus heparin alone or placebo.

Main Methods:

  • Systematic review and meta-analysis of 18 randomized controlled trials (RCTs) involving 2197 participants.
  • Included trials compared thrombolytic therapy followed by heparin against heparin alone, heparin plus placebo, or surgery.
  • Excluded trials comparing different thrombolytic agents or dosages.

Main Results:

  • Thrombolytics plus heparin significantly reduced the odds of death (OR 0.57) and PE recurrence (OR 0.51) compared to heparin alone (low-quality evidence).
  • Higher incidence of major (OR 2.90) and minor (OR 3.09) hemorrhagic events observed in the thrombolytic group.
  • Stroke risk was elevated in the thrombolytic group (OR 12.10), though with wide confidence intervals.

Conclusions:

  • Low-quality evidence suggests thrombolytics reduce mortality in acute PE but increase bleeding complications and stroke risk.
  • Thrombolytic therapy may help reduce PE recurrence.
  • Further high-quality, double-blind RCTs are necessary to evaluate safety and cost-effectiveness.