Objective: To analyze whether the administration of low-dose aspirin during IVF treatment improves the uterine blood flow and improves ongoing pregnancy rates for non-tubal factor IVF patients with previous failed conception.
Design: Prospective double-blind placebo-controlled trial.
Setting: University fertility clinic.
Patient(s): Non-tubal IVF patients with previous failed conception.
Intervention(s): Daily 100 mg aspirin or placebo throughout an IVF treatment with a long GnRH-agonist stimulation protocol.
Main outcome measure(s): Ongoing pregnancy rate, pulsatility index of the uterine artery.
Result(s): Of 169 patients, 84 were assigned to aspirin treatment and 85 to placebo treatment. In the aspirin group, 28 patients (35.4%) had an ongoing pregnancy, and in the placebo group, 26 patients (31.0%) had an ongoing pregnancy. Multilevel analyses showed that the pulsatility index of the uterine artery was not affected by aspirin or placebo treatment.
Conclusion(s): Low-dose aspirin administration during IVF treatment does not improve pregnancy rates of non-tubal factor IVF patients with previous failed conception, and it does not affect the arterial uterine blood flow.