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Updated: Jun 10, 2026

Murine Fetal Echocardiography

Murine Fetal Echocardiography

Published on: February 15, 2013

Diagnosing foetal atrioventricular heart blocks.

¹Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden. sven-erik.sonesson@karolinska.se

Scandinavian Journal of Immunology

|August 11, 2010

Summary

Foetal echocardiographic ultrasound is key for diagnosing foetal atrioventricular block (AVB). Differentiating conditions like blocked atrial bigeminy from 2:1 AVB is crucial for appropriate management and avoiding unnecessary treatment.

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Area of Science:

Cardiology
Foetal Medicine
Medical Imaging

Background:

Foetal echocardiography is the primary method for diagnosing foetal atrioventricular block (AVB).
Other techniques like foetal electrocardiography and magnetocardiography have limited clinical roles.
AVB is viewed as a progressive condition, potentially starting in mid-gestation.

Purpose of the Study:

To review the diagnostic capabilities of echocardiographic techniques for foetal AVB.
To highlight the importance of differentiating various causes of foetal bradycardia.
To emphasize the clinical significance of accurate diagnosis for treatment decisions.

Main Methods:

Review of foetal echocardiographic ultrasound techniques for diagnosing AVB.
Analysis of time intervals based on mechanical/hemodynamic markers of atrial and ventricular depolarization.
Systematic diagnostic approach for foetal bradycardia.

Main Results:

Echocardiography can diagnose most cases of foetal bradycardia with a systematic approach.
Transient AV time prolongation observed in anti-Ro/SSA antibody-exposed foetuses, but prediction of irreversible damage remains elusive.
Distinguishing blocked atrial bigeminy (BAB) from 2:1 AVB is critical, as BAB resolves spontaneously while 2:1 AVB may require treatment.

Conclusions:

Foetal echocardiography remains the gold standard for diagnosing foetal AVB.
Accurate differentiation between BAB and 2:1 AVB is essential to guide treatment and prevent unnecessary interventions.
Further research may refine the predictive value of AV time intervals in foetal cardiology.