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Updated: Jul 2, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
Published on: January 16, 2019
Prenatal diagnosis and management of fetal Long QT syndrome
Viktor Tomek1, Jan Skovranek, Roman A Gebauer
1Kardiocentrum and Cardiovascular Research Centre, University Hospital Motol, V uvalu 84, 150 08, Prague 5, Czech Republic. viktor.tomek@seznam.cz
Abstract:
This report describes a fetus presenting with second-degree atrioventricular block, sinus bradycardia, and transient ventricular tachycardia with ventriculoatrial dissociation. Long QT syndrome (LQTS) was suspected due to the association of heart rhythm disturbances and very short transmitral early deceleration time. This impaired relaxation of the left ventricle was explained by the extreme prolongation of the refractory period caused by the prolonged relaxation time. The infant was treated successfully with beta-blockers and implantation of a pacemaker. The prognosis is poor when LQTS presents utero or during the first week of life. To date, only a few case reports of a fetus with LQTS have been published.
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