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Study identifier: NCT04474223 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Surveillance and Treatment to Prevent Fetal Atrioventricular Block Likely to Occur Quickly (STOP BLOQ)

Condition: AVB - Atrioventricular Block · Fetal AVB  ·  Sponsor: NYU Langone Health

PhasePhase 3
Planned participants1300
Who can joinFemale, 18 Years to no upper limit
Healthy volunteersNo

About this study

Fetal complete (i.e., third degree, 3°) atrioventricular block (AVB), identified in the 2nd trimester of pregnancy in an otherwise normally developing heart, is almost universally associated with maternal anti-Ro autoantibodies and results in death in a fifth of cases. To date treatment of 3° AVB has been ineffective in restoring normal rhythm (NR) which may be because current surveillance is limited to once- weekly fetal echocardiograms. It is hypothesized that there may be a vital transition period of several hours in which incomplete block (2° AVB) may be successfully treated avoiding fully advanced irreversible 3° AVB. To optimize the likelihood of timely detection of the transition period this study comprises three steps: 1) to risk stratify for high titer anti-Ro antibodies, which are necessary but not sufficient to develop fetal AVB; 2) to empower mothers to identify 2° AVB by using fetal heart rate and rhythm monitoring (FHRM) at home, and 3) to rapidly treat mothers who detect an abnormality by monitoring with an urgent echocardiogram that confirms 2° AVB with the hope of reversing 2° AVB before it becomes permanent (3° AVB). In addition, it will be determined if FHRM reduces the need for weekly echoes. Although mothers with low titer anti-Ro will not be continued in Step 2 and therefore not followed by FHRM, birth ECGs will be collected to confirm that low titer antibodies do not confer risk. It is anticipated that this study will provide an evidenced based surveill…

This description comes directly from the study's public registry record.

Talk to the study team

Mala Masson  ·  212-263-0372  ·  mala.masson@nyulangone.org

Jill Buyon, MD  ·  212-263-0756  ·  Jill.Buyon@nyulangone.org,

Always discuss trial participation with your own doctor first.

Locations (24)

Phoenix Children's Hospital/Dignity HealthPhoenix, Arizona, United StatesRecruiting
University of California - Los Angeles (UCLA)Los Angeles, California, United StatesRecruiting
Stanford UniversityPalo Alto, California, United StatesRecruiting
University of California-San FranciscoSan Francisco, California, United StatesRecruiting
University of Colorado, Denver (UCD)Aurora, Colorado, United StatesRecruiting
Yale University School of MedicineNew Haven, Connecticut, United StatesRecruiting
Children's National Medical Center/George Washington UniversityWashington D.C., District of Columbia, United StatesRecruiting
University of Kentucky / Kentucky Children's HospitalLexington, Kentucky, United StatesRecruiting
University of Louisville / Norton Children's HospitalLouisville, Kentucky, United StatesNot Yet Recruiting
University of Michigan / C. S. Mott Children's HospitalAnn Arbor, Michigan, United StatesRecruiting
Children's Hospital of MinnesotaMinneapolis, Minnesota, United StatesRecruiting
Perinatal Associates of New MexicoRio Rancho, New Mexico, United StatesRecruiting

+ 12 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT04474223