Self-administered isoflurane in labour. A comparative study with Entonox.

Area of Science:

• Obstetrics and Gynecology
• Anesthesiology
• Pharmacology

Background:

• Pain management during the first stage of labor is crucial for maternal well-being.
• Entonox (nitrous oxide/oxygen mixture) is a common analgesic, but its efficacy can vary.
• Exploring alternative analgesics like isoflurane is important for improving labor pain management.

Purpose of the Study:

• To compare the analgesic efficacy of Entonox and isoflurane during the first stage of labor.
• To evaluate patient-reported pain scores and side effects associated with each analgesic.

Main Methods:

• A randomized, within-patient controlled study involving 32 consenting women.
• Self-administration of Entonox and isoflurane (0.75% in oxygen) during five consecutive uterine contractions.
• Pain assessment using linear analogue pain scores.

Main Results:

• Isoflurane demonstrated significantly lower pain scores compared to Entonox (p < 0.001).
• Patients reported higher scores for drowsiness when using isoflurane.
• Individual patient control minimized variability, enhancing the reliability of the findings.

Conclusions:

• Isoflurane appears to be a more effective analgesic than Entonox in the early stages of labor.
• Increased drowsiness is a notable side effect of isoflurane that requires consideration.
• Further investigation into the safety and efficacy of prolonged isoflurane administration during labor is warranted.