Ultrasonographic diagnosis of delayed atrioventricular conduction during fetal life: a reliability study.
retrospective_cohort · Level III
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- Record sourced from PubMed, PMID 20435283.
- Also identified by DOI 10.1016/j.ajog.2010.02.024.
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Abstract
The objective of the study was to evaluate the reliability of the 2 most commonly used ultrasonographic approaches for monitoring fetal atrioventricular conduction time (AVCT): (1) superior vena cava/ascending aorta (SVC/AA), and (2) left ventricular inflow/outflow tract (LVI/O) Doppler recordings. Echographic studies from fetuses followed up for first-degree atrioventricular block (AVB-1) between 1998 and 2008 were reviewed. The ability to identify atrial contractions in the same fetuses by the SVC/AA and LVI/O approaches was analyzed. Sixty-six studies of 13 fetuses with AVB-1 were available. Atrial contractions were visible in all SVC/AA studies. With the LVI/O approach, atrial contractions could not be identified in 26 studies (39%). AVCT delay was significantly greater in the nonidentifiable compared with the identifiable atrial contraction group (P < .001). Differences in heart rate and gestational age were not significant. The LVI/O is unsuitable for prenatal screening of conduction system anomalies.
Medical subject headings
- Atrioventricular Block
- Echocardiography, Doppler
- Fetal Diseases
- Heart Conduction System
- Ultrasonography, Prenatal