Table 3.
Management protocols in labor, umbilical cord blood acid-base characteristics
| Trial | Plymouth RCT | Swedish RCT | Finnish RCT | French RCT | Dutch RCT |
|---|---|---|---|---|---|
| Fetal scalp blood sampling | Guidelines related to the CTG in both groups | Optional | Optional | Optional | Guidelines in ST group, optional in CTG group |
| ST analysis interpretation algorithm | Fixed T/QRS ratio cut-offs (>0.24 > 30 min; >0.5 > 15 min), ST changes >5 min | Progressive T/QRS ratio increases, ST changes | Progressive T/QRS ratio increases, ST changes | Progressive T/QRS ratio increases, ST changes | Progressive T/QRS ratio increases, ST changes |
| Cord blood samples | Artery + vein | Artery + vein | Artery + vein | Artery + vein | Artery + vein |
| Validation of cord blood samplesa | No | V-A pH ≥ 0.3, A-V Pco2 ≥ 1.0 kPa (revised article) | No | A-V Pco2 > 0.5 kPa | V-A pH ≥ 0.3 |
| Base deficit algorithm compartment | Extracellular fluid | Extracellular fluid | Blood | Extracellular fluid | Extracellular fluid and blood |
CTG, cardiotocography; RCT, randomized controlled trials.
a
V, umbilical cord vein; A, umbilical cord artery; V-A, venous-to-arterial difference; A-V, arterial-to-venous difference.