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Early plasma creatinine values in discordant twins
Summary
Smaller twins in discordant sets showed higher early plasma creatinine levels, suggesting impaired placental perfusion. However, these creatinine values remained within normal ranges, preventing definitive diagnosis of uterine-placental compromise.
Area of Science:
- Neonatal Physiology
- Perinatal Medicine
- Fetal Development
Background:
- Impaired placental perfusion before birth may lead to elevated postnatal creatinine.
- Early postnatal creatinine levels are being investigated as an indicator of fetal well-being.
Purpose of the Study:
- To assess if early plasma creatinine levels in smaller twins from discordant sets can indicate impaired placental perfusion.
- To evaluate the utility of early creatinine as a marker for compromised fetal development.
Main Methods:
- Simultaneous measurement of plasma creatinine, urea nitrogen, and hematocrit in 35 twin pairs within the first day of life.
- Grouping twins into discordant (birth weight difference >15%) and less discordant (birth weight difference ≤15%) sets.
- Statistical analysis using the Wilcoxon Signed Rank test to compare values between co-twins.
Main Results:
- Smaller twins in the discordant group exhibited significantly higher mean plasma creatinine levels (p=0.03).
- Larger twins in the discordant group showed significantly higher mean plasma urea levels (p=0.01).
- A negative correlation was observed between gestational age and early creatinine values.
Conclusions:
- Elevated early creatinine in smaller, growth-restricted twins supports the hypothesis of compromised creatinine clearance due to impaired placental perfusion.
- Observed creatinine levels were within normal ranges, limiting their use as a sole indicator of uterine-placental compromise.
- Further research with documented severe fetal compromise is needed to establish early creatinine as a diagnostic marker for intra-uterine insults.