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Mortality rates equal for atrial flutter, tachycardia. (Fetal Polyarrhythmia).
NEW YORK -- Fetal atrial flutter gets diagnosed about 2 weeks later in pregnancy than does fetal supraventricular tachycardia, but mortality rates are similar in fetuses with either polyarrhythmia, according to results of a metaanalysis.
The medical literature in general suggests that among fetuses with cardiac polyarrhythmias 20%-33% will have atrial flutter, and 60%-70% will have supraventricular tachycardia.
Some authors have suggested that prognosis is worse with atrial flutter than with supraventricular tachycardia, Dr. Martin Krapp commented at the 12th World Congress on Ultrasound in Obstetrics and Gynecology.
To better counsel parents in these cases, Dr. Krapp and his associates at the University of Lubeck (Germany) conducted a metaanalysis of 10 studies published since 1990. Of the 485 fetuses diagnosed with cardiac polyarrhythmias, 26% had atrial flutter, 73% has supraventricular tachycardia, and the rest had ventricular tachycardia or other problems.
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