Clinical trial Recruiting at 1 site Interventional Ages 18 to 45 Women only

Optimizing Anticoagulation in Pregnancies With Mechanical Heart Valves

Official title: A Prospective Multicenter Cohort Pilot Study Comparing Antithrombotic Regimens in Pregnancies With Mechanical Heart Valves

Run by Mount Sinai Hospital, Canada · NCT07658989 · Data updated 2026-11-12

This study tests whether using low molecular weight heparin with low-dose aspirin during pregnancy is as safe and effective as the standard warfarin-based approach for people with mechanical heart valves.

Quick facts

Study typeInterventional
Ages18 Years to 45 Years
SexWomen only
Enrollment100 (estimated)
SponsorMount Sinai Hospital, Canada
Academic / other
Locations1 site (Toronto, Ontario)
StatusRecruiting
StartedMay 26, 2026
Main results expectedJanuary 2030
Study endsDecember 2030
Registry record updatedJune 22, 2026
Trial IDNCT07658989 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Pregnant individuals with one or more mechanical heart valves, aged 18 or older, willing to participate, and presenting before 12 weeks gestation.

Probably not a fit

Patients who cannot tolerate the regimens or do not maintain adequate anticoagulation levels may not experience benefit and could face adverse events.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This multicenter pilot study compares two antithrombotic strategies for pregnant people with mechanical heart valves. It aims to determine whether LMWH with low-dose aspirin can achieve similar maternal and fetal safety and outcomes as warfarin-based therapy, with careful monitoring to ensure appropriate anticoagulation levels. The trial will enroll about 100 pregnancies, collect data, and use findings to plan a larger, definitive study on survival, clotting events, and cardiac function. Participation is limited to early pregnancy (<12 weeks) at qualified centers with appropriate monitoring capabilities.

Why it matters

Potential benefit: If successful, the study could identify an anticoagulation approach that maintains maternal and fetal safety during pregnancy for people with mechanical heart valves.

How similar studies have gone: Observational data exist but standardized, prospective multicenter data are limited, making this pilot study a novel step toward clearer guidance.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Pregnant individuals with one or more MHVs
2. Who consent to participate
3. Are 18 years or older and
4. Less than 12 weeks gestation

Exclusion Criteria:

1. Have a platelet count less than 50 x 10(9)/L as there is an increased risk of bleeding with thrombocytopenia, and/or
2. Have active bleeding defined as bleeding resulting in a hemoglobin reduction ≥10 g/L or in hemodynamic instability.
3. Have new valve thrombosis identified immediately prior to pregnancy

Where it's running

  • Mount Sinai Hospital
    Toronto, Ontario, Canada
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.