Abstract
Background/aims. To investigate the effect of the mode of delivery on maternal-neonatal Mg and Zn levels. Material and methods. Two groups of pregnant women participated in the study: Group ...A (n = 16) with normal labor and vaginal delivery and group B (n = 14) with scheduled cesarean section (CS). Blood was obtained at the beginning of the labor, immediately after delivery and from the umbilical cord (CB). Serum Mg and Zn were measured with atomic absorption spectroscopy and total antioxidant status (TAS) levels with a chemical autoanalyser. Results. Mg, Zn and TAS levels were similar pre-delivery in both groups. TAS levels, Mg (0.81 ± 0.09 vs 0.69 ± 0.03 mmol/L, p < 0.001) and Zn levels (9.34 ± 0.37 vs 5.74 ± 0.24 μmol/L, p < 0.001) were significantly decreased after vaginal delivery. These biochemical parameters were measured practically unaltered at the same times of study in group B. The mineral levels did not differ in the CB of both groups. Conclusions. The decreased maternal Mg, Zn and TAS levels post vaginal delivery may be due to the participation of skeletal and uterus muscles and the similar levels of the minerals in the CB of neonates to the placental protection.
To investigate the effect of the mode of labour and delivery on the total antioxidant status (TAS) and the paraoxonase 1 (PON 1) serum activity in mothers and their newborns.
One hundred six women ...with normal pregnancy were divided into 4 groups: group A (
n = 28) with normal labour and vaginal delivery (VG), group B (
n = 25) with scheduled caesarean section (CS), group C (
n = 26) with “emergency” CS and group D (
n = 27) with prolonged labour + VG. Blood was obtained from the mothers at the beginning of the labour process and immediately after delivery (pre- and post-delivery) as well as from the umbilical cord (CB). PON 1 activity and blood chemistry were determined using the Bayer Advia 1650 Clinical Chemistry System, whereas TAS levels were measured spectrophotometrically at 450 min in microtiter plates.
TAS levels were similar pre-delivery and low in CB in all the groups. In contrast, TAS levels were remarkably reduced in group C and in group D post-delivery whereas they were nearly unchanged in group B and just lowered in group A, at the same time of study. PON 1 activity was practically unaltered in group A and group B pre- vs. post-delivery. Interestingly, the enzyme activity was remarkably decreased in group C (222 ± 16 vs. 153 ± 14 U/min/mL) and group D (216 ± 16 vs. 135 ± 15 U/min/mL,
p < 0.001) as compared with those of the other groups at the same time of study. Additionally, PON 1 activity was higher in the newborns of group A and group B than those in group C and group D. TAS and HDL positively correlated with PON 1 activity.
The low TAS levels and the decreased PON 1 activity, which were found in groups C and D post-delivery, may be due to the increased production of free radicals, during long-lasting labour + VG and obstructive labour + CS. PON 1 activity was low in CB irrespectively of the mode of delivery, probably due to the low lipid levels in the serum of the umbilical cord. Neonates born with normal delivery or scheduled CS are benefited with a higher antiatherogenic enzyme activity perinatally.
