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Platelet dysfunction in the neonate with essential fatty acid deficiency
Insights
Essential fatty acid (EFA) deficiency in premature infants receiving parenteral nutrition impairs platelet aggregation and increases hemorrhage risk. Supplementation improved platelet function, suggesting a causal link.
Area of Science:
- Biochemistry
- Neonatal Medicine
- Hematology
Background:
- Parenteral nutrition (PN) in premature infants can lead to essential fatty acid (EFA) deficiency.
- EFA deficiency impacts various physiological processes, including hemostasis.
Purpose of the Study:
- To investigate the effect of EFA deficiency on platelet aggregation in sick premature newborns.
- To explore the relationship between EFA deficiency, platelet dysfunction, and clinical hemorrhage.
Main Methods:
- Assessed platelet aggregation in response to adenosine diphosphate (ADP) in five EFA-deficient premature infants on fat-free PN.
- Diagnosed EFA deficiency via plasma lipid fatty acid analysis.
- Compared platelet function to control low-birth-weight infants fed orally.
Main Results:
- EFA-deficient infants exhibited significantly impaired platelet aggregation (e.g., 18.1% vs. 43.4% at 2.5 muM ADP).
- Platelets from deficient infants showed marked disaggregation.
- Four of five EFA-deficient infants experienced clinical hemorrhage.
- Platelet function normalized upon recovery from EFA deficiency.
Conclusions:
- EFA deficiency, specifically of arachidonic acid, is strongly correlated with impaired platelet aggregation mediated by thromboxane A2.
- The findings support a hypothesis that EFA deficiency causally contributes to platelet dysfunction and bleeding in premature infants.
- This highlights the importance of adequate EFA provision in neonatal PN.
Abstract:
Platelet aggregation in response to ADP was studied in five EFA-deficient sick premature newborn infants who were receiving fat-free parenteral nutrition. EFA deficiency was diagnosed by analysis of plasma lipid fatty acid values. The deficient infants had impaired platelet aggregation when compared to other low-birth-weight infants fed orally who served as control subjects (maximum 18.1% versus 43.4% at 2.5 muM ADP; 34.5% versus 52.2% at 5.0 muM ADP). In addition, the platelets from EFA-deficient infants demonstrated clearly evident disaggregation. On recovery from their deficient state, the low-birth-weight infants had platelet functions similar to those of apparently healthy premature infants. Clinical hemorrhage occurred in four of the EFA-deficient infants. Thus a deficiency of arachidonic acid, the precursor of thromboxane A2, is correlated with an impairment of the aggregation of platelets, a phenomenon mediated by thromboxane A2. This correlation provides the basis for a hypothesis that the observed EFA deficiency is causally related to the platelet dysfunction.
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