from Section 3 - Late Prenatal – Fetal Problems
Published online by Cambridge University Press: 15 November 2017
The myocardium first starts to contract about 26 days after conception as a consequence of the rhythmical electrical depolarization of pacemaker-precursor cells. Cardiac arrhythmias are commonly encountered later in development and have been reported in about 2% of all pregnancies. With increasing use of antenatal screening, arrhythmias are more likely to be encountered, usually as a random pick-up. While the majority of them are benign (mostly atrial ectopic beats), some are associated with significant morbidity and mortality. For the latter group appropriate antenatal diagnosis may improve outcome by proper pre- and postnatal therapy.
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