[The fetal ECG--ST analysis in the diagnosis of fetal hypoxia]

Clinical tests of a new apparatus STAN S21 evaluating the foetal ECG--ST section in the diagnosis of foetal hypoxia.

Retrospective analysis.

Gynaecological and Obstetric Clinic, First Medical Faculty Charles University and General Faculty Hospital, Prague.

Within the framework of clinical tests 27 analyses were made on a apparatus STAN S21 manufactured by Swedish firm Neoventa. Contrary to hitherto implemented and published studies, in all monitored deliveries the CTG curve was evaluated as well as FpO2 and STAN. After each delivery in the neonate the Apgar score and acid-base equilibrium from the umbilical artery was evaluated. ST analysis was included mainly in case of abnormal CTG records, risk and pathological deliveries. Evaluation was divided into two groups: in one delivery was terminated by the vaginal route, in the second one by Caesarean section. For evaluation of the CTG curve the FIGO terminology was selected (intermediary-suspect) and (abnormal-pathological). For evaluation of the FpO2 pathology 30% saturation for 10 minutes was used. In STAN analysis important phenomena were evaluated by computer (increase of T wave, increase of T/QRS complex and biphasic character of ST).

In reduced values of the Apgar score (during the 5th minute < 8 points) and the acid-base balance from umbilical artery (pH < 7.2, BE > -8) pathological CTG records and FpO2 were present in 25%. STAN had in these instances pathological records in 50%).

ST analysis is another very effective link in the diagnosis of interpartial foetal hypoxia. Initial experience indicates, that STAN will have probably a higher diagnostic specificity than CTG and FpO2.