Deceleration area and capacity during labour‐like umbilical cord occlusions identify evolving hypotension: a controlled study in fetal sheep
| Autor: | Jenny A. Westgate, Alistair J. Gunn, Christopher A. Lear, Tomoaki Ikeda, Etsuko Miyagi, Antoniya Georgieva, Laura Bennet, Michi Kasai |
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| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Cardiotocography Umbilical cord Umbilical Cord 03 medical and health sciences 0302 clinical medicine Pregnancy Internal medicine Occlusion medicine Animals Humans Prospective Studies Asphyxia Fetus Labor Obstetric Sheep 030219 obstetrics & reproductive medicine medicine.diagnostic_test business.industry Obstetrics and Gynecology Heart Rate Fetal Hypoxia (medical) Blood pressure medicine.anatomical_structure Hypoxia-Ischemia Brain Cardiology Female medicine.symptom business Cohort study |
| Zdroj: | BJOG: An International Journal of Obstetrics & Gynaecology. 128:1433-1442 |
| ISSN: | 1471-0528 1470-0328 |
| Popis: | Objective: Cardiotocography is widely used to assess fetal well‐being during labour. The positive predictive value of current clinical algorithms to identify hypoxia‐ischaemia is poor. In experimental studies, fetal hypotension is the strongest predictor of hypoxic‐ischaemic injury. Cohort studies suggest that deceleration area and deceleration capacity of the fetal heart rate trace correlate with fetal acidaemia, but it is not known if they are indices of fetal arterial hypotension. Design: Prospective, controlled study. Setting: Laboratory. Sample: Near‐term fetal sheep. Methods: 1 min of complete umbilical cord occlusions (UCOs) every 5 min (1:5min, n=6) or every 2.5 min (1:2.5min, n=12) for 4 h or until fetal mean arterial blood pressure fell Main Outcome Measures: Deceleration area and capacity during the UCO series were related to evolving hypotension. Results: The 1:5min group developed only mild metabolic acidaemia, without hypotension. By contrast, 10/12 fetuses in the 1:2.5min group progressively developed severe metabolic acidaemia and hypotension, reaching 16.8±0.9mmHg after 71.2±6.7 UCOs. Deceleration area and capacity remained unchanged throughout the UCO series in the 1:5 min group, but progressively increased in the 1:2.5 min group. The severity of hypotension was closely correlated with both deceleration area (p Conclusions: Both deceleration area and capacity were strongly associated with developing fetal hypotension, supporting their potential to improve identification of fetuses at risk of hypotension leading to hypoxic‐ischaemic injury during labour. |
| Databáze: | OpenAIRE |
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