Low-Intensity vs. High-Intensity Antithrombotic Therapy After Transcatheter Aortic Valve Replacement: Meta-Analysis...

Area of Science:

• Cardiology
• Interventional Cardiology
• Pharmacology

Background:

• Optimal antithrombotic therapy post-transcatheter aortic valve replacement (TAVR) remains debated.
• Current guidelines lack consensus on the intensity of antithrombotic treatment in the absence of clear indications for anticoagulation.

Purpose of the Study:

• To systematically review and meta-analyze randomized controlled trials comparing high-intensity versus low-intensity antithrombotic therapy after TAVR.
• To evaluate the efficacy and safety of different antithrombotic strategies in patients undergoing TAVR without established indications for anticoagulation.

Main Methods:

• Systematic review and meta-analysis of randomized controlled trials.
• Inclusion criteria: studies comparing high-intensity vs. low-intensity antithrombotic therapy post-TAVR in the absence of anticoagulation indications.
• Primary endpoints: composite of death or thromboembolic events, and Valve Academic Research Consortium 2-defined significant bleeding. Analysis using intention-to-treat and random-effects models.

Main Results:

• Four trials involving 3358 patients were analyzed.
• Low-intensity antithrombotic therapy was associated with significantly lower rates of death or thromboembolic events (RR 0.66; 95% CI 0.55-0.80) compared to high-intensity therapy.
• Patients on low-intensity therapy also experienced significantly less death (RR 0.68; 95% CI 0.51-0.92) and major bleeding (RR 0.69; 95% CI 0.48-1.00).

Conclusions:

• Routine high-intensity antithrombotic therapy post-TAVR in elderly patients without specific indications for anticoagulation is linked to increased risks.
• Initiating anticoagulation or dual-antiplatelet therapy routinely after TAVR may not be advisable.
• Low-intensity antithrombotic strategies appear safer and more effective in this patient population.