X-ray microanalysis of myometrium in parturient women at term.

An increase in intracellular phosphorus levels was observed in the normal labour group compared to before labour, with a significance level of p < .01.

• Normal labour is associated with higher levels of phosphorus and potassium compared to oxytocin-resistant labour.
• Oxytocin-resistant labour shows lower intracellular potassium and phosphorus levels, alongside higher chloride and sodium levels.
• The ion distribution in myometrial cells may be disturbed in dysfunctional labour, indicated by the altered ion levels.
• Reduced potassium and phosphorus levels, coupled with increased sodium and chloride, may relate to dysfunction in the sodium-potassium pump.

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