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Intermittent fetal bradycardia induced by midpregnancy fetal ultrasonographic study
G J Mendoza1, O Almeida, L Steinfeld
1Department of Pediatrics, Mount Sinai School of Medicine, City University of New York, NY.
Fetal bradycardias were observed during fetal ultrasonographic and echocardiographic studies performed in the second trimester of pregnancy. The episodes of bradycardia were brief and recovery was usually rapid. Ultrasound transducer pressure applied to the maternal abdomen during the study provoked the phenomenon. Vagal discharge resulting from an increase in intrauterine pressure appeared to be the causative mechanism.
Fetal bradycardias were observed during fetal ultrasonographic and echocardiographic studies performed in the second trimester of pregnancy. The episodes of bradycardia were brief and recovery was usually rapid. Ultrasound transducer pressure applied to the maternal abdomen during the study provoked the phenomenon. Vagal discharge resulting from an increase in intrauterine pressure appeared to be the causative mechanism.