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Is the fetus "scalped" in labour?
Lancet (London, England)
|November 3, 1979
Summary
Scalp circulation differs from forearm circulation under pressure. Fetal scalp oxygenation during labor may not accurately reflect fetal well-being due to these circulatory differences.
Area of Science:
- Physiology
- Medical Sciences
Background:
- Assessing fetal well-being during labor is critical.
- Fetal scalp blood-flow and oxygenation are potential indicators.
Purpose of the Study:
- To compare scalp and forearm skin circulation responses to pressure.
- To evaluate the reliability of fetal scalp oxygenation as an indicator of fetal well-being.
Main Methods:
- Measured capillary blood-flow and tissue oxygenation in adult scalp and forearm skin.
- Applied pressure to occlude circulation in both areas.
Main Results:
- Lower pressure was needed to occlude scalp circulation compared to forearm.
- Tissue oxygenation decreased sharply when blood-flow dropped below 3 ml/100 g/min.
- Scalp circulation response to pressure is not representative of general circulation.
Conclusions:
- Fetal scalp circulation is not representative of general circulation under pressure.
- Fetal scalp oxygenation measurements during labor may be unreliable indicators of fetal well-being.