Objective: to evaluate the correlation between the short term variability during labour and the hypoxic fetal status. Methods: A prospective study was performed from Jan 2006 and Nov 2006 on 35 pregnant women near term or to at term in labour. 15 out of 35 had physiological fetal heart rate patterns. 20 out of 35 had CTG signs that were considered not reassurin these cases there was a continuous electronic cardiotocographic monitoring. At the same time a cCTG was performed and recc a pc software.Short term variability values were then compared to the BE values. Cut-off value chosen for the short term varia was 6 ms. Cut-off value chosen for the BE in order to diagnose metabolic acidosis was -10 mmol/L. Results: All 15 normal fetal heart rate patterns showed a short term variability > 6ms. Acid-base balance in these 15 neonates shows a BE value > -10 mmol/L thus there wasn't a metabolic acidosis state. Correlating data we exposed so far we realize the time the short term variability value was ≥ 6 ms BE value was > -1O mmol/L. 3 out of the 20 not reassuring fetal heart rate p; had a short term variability value < 6 ms during labour. Acid-base balance in these 20 neonates showed the presence of 2 cas a BE value < -10 mmol/L. In those case in wich the BE value < -10 mmol/L were identified considering the short term variabilis evaluation. Thus evaluating short term variability allowed us to point out the 2 out of 35 fetal acidosis cases in our sample. In study the sensitivity of the short term variability used as a detecting hypoxic fetal suffering status parameter was 100%. Spec was 97%. Positive predictive value was 67% and the negative predictive value was 100%. Conclusions: Our study demonstrated that a short term variability value persisting ≥ 6 ms during labour allow us to exclude fetal hypoxic suffering. This should be used for decision makink as well as to avoid litigation.

The role of cCTG in predicting Fetal hypoxia and Acidosis.

Fais, Paolo
2008

Abstract

Objective: to evaluate the correlation between the short term variability during labour and the hypoxic fetal status. Methods: A prospective study was performed from Jan 2006 and Nov 2006 on 35 pregnant women near term or to at term in labour. 15 out of 35 had physiological fetal heart rate patterns. 20 out of 35 had CTG signs that were considered not reassurin these cases there was a continuous electronic cardiotocographic monitoring. At the same time a cCTG was performed and recc a pc software.Short term variability values were then compared to the BE values. Cut-off value chosen for the short term varia was 6 ms. Cut-off value chosen for the BE in order to diagnose metabolic acidosis was -10 mmol/L. Results: All 15 normal fetal heart rate patterns showed a short term variability > 6ms. Acid-base balance in these 15 neonates shows a BE value > -10 mmol/L thus there wasn't a metabolic acidosis state. Correlating data we exposed so far we realize the time the short term variability value was ≥ 6 ms BE value was > -1O mmol/L. 3 out of the 20 not reassuring fetal heart rate p; had a short term variability value < 6 ms during labour. Acid-base balance in these 20 neonates showed the presence of 2 cas a BE value < -10 mmol/L. In those case in wich the BE value < -10 mmol/L were identified considering the short term variabilis evaluation. Thus evaluating short term variability allowed us to point out the 2 out of 35 fetal acidosis cases in our sample. In study the sensitivity of the short term variability used as a detecting hypoxic fetal suffering status parameter was 100%. Spec was 97%. Positive predictive value was 67% and the negative predictive value was 100%. Conclusions: Our study demonstrated that a short term variability value persisting ≥ 6 ms during labour allow us to exclude fetal hypoxic suffering. This should be used for decision makink as well as to avoid litigation.
Acidosis.; Fetal hypoxia; cCTG; short term variability
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11562/509153
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