Effects of oral propranolol on parathyroid hormone secretion in chronic renal failure.

differences show that delivery by lower segment caesarean section is more dangerous when the fetus presents by the breech, even in the best possible circumstances. The greater likelihood of a low Apgar score might be due to an inherent abnormality which in itself had caused the breech presentation but perhaps is more likely to be due to respiratory efforts before delivery of the head. A mature, healthy fetus is probably well able to withstand this extra insult, but for a breech-presenting fetus which becomes distressed during preterm labour the added hazard might be important. If the hypothesis that delay in delivery of the fetal head causes the depression is correct then this is another reason to consider delivery by classical caesarean section in cases of breech presentation where the fetus is already compromised.