Open AccessChanges in fetal supraventricular extrasystoles during uterine contractions in labour
Author(s) -
Jenssen Helge
Publication year - 1978
Publication title -
acta obstetricia et gynecologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 102
eISSN - 1600-0412
pISSN - 0001-6349
DOI - 10.3109/00016347809154888
Subject(s) - medicine , fetus , uterine contraction , fetal heart , myometrium , obstetrics , pregnancy , uterus , gynecology , genetics , biology
The electrocardiogram and phonocardiogram were recorded from a fetus exhibiting supraventricular ectopic beats during labour. The ectopic beats showed increased amplitude of the first heart sound (S 1 ) compared to sinus and postectopic beats; the R–S 1 interval was prolonged and the mechanical systole, measured as the S 1 –S 2 interval, shortened. During uterine contractions these parameters were measured every 10 sec. The S 1 amplitude of the ectopic beats decreased; simultaneously the R–S 1 interval increased and the S 1 –S 1 interval shortened. The changes were delayed compared to the amniotic pressure curve. The changes found can be explained by a shift of blood between the fetus and placenta, caused by uterine contraction.