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  • Title: [Pressure on the fetal head in vacuum extraction].
    Author: Rempen A.
    Journal: Geburtshilfe Frauenheilkd; 1993 May; 53(5):337-41. PubMed ID: 8514106.
    Abstract:
    The pressure exerted on the foetal head was continuously measured with a specially designed instrument in 4 children delivered by vacuum extraction because of arrested delivery. The results were compared with the values obtained in spontaneous deliveries. Lower head pressure values were found in the vacuum group, with a head pressure to amniotic pressure ratio < 1 (normal > 1) before application of the cup. During extraction the head pressure exceeded the intraamniotic pressure. Normal progress of labour requires not only sufficient intrauterine pressure but also an adequate pressure transmission to the presenting part that must widen the birth canal. A prolonged course of labour may therefore be associated with increased pressure values due to elevated resistance of the birth canal as well as with decreased pressure values due to insufficient transmission of pressure. Hence, the load of the foetal head during uterine contraction cannot be determined from the duration of birth.
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