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Substance P, mean apnoea duration and the sudden infant death syndrome (SIDS)
Insights
This study found higher substance P-like immunoreactivity (SPLI) and longer mean apnea duration (MA) in infants at risk for Sudden Infant Death Syndrome (SIDS). These findings suggest respiratory control disturbances in high-risk infants.
Area of Science:
- Neonatology
- Pediatric Pulmonology
- Neuroscience
Background:
- Sudden Infant Death Syndrome (SIDS) remains a leading cause of infant mortality.
- Understanding disturbances in respiratory control is crucial for SIDS prevention.
- Substance P-like immunoreactivity (SPLI) and apnea duration (MA) are potential biomarkers for respiratory control.
Purpose of the Study:
- To evaluate respiratory control disturbances in infants at risk for SIDS.
- To compare SPLI levels and MA in different infant risk groups.
- To investigate the relationship between SPLI, MA, and infant age.
Main Methods:
- Investigated four groups: controls, full-term infants with SIDS risk factors, preterm infants with and without additional risk factors.
- Measured plasma SPLI using radioimmunoassay.
- Assessed mean apnea duration (MA) via daytime polygraphy.
Main Results:
- SPLI levels were significantly lower in preterm infants (with or without risk factors) compared to controls.
- Full-term SIDS-risk infants had higher SPLI than preterm groups but lower than controls.
- MA was significantly higher in all three risk groups compared to controls during the peak SIDS frequency age range (4-17 weeks).
Conclusions:
- Infants at enhanced risk for SIDS exhibit altered respiratory control.
- Elevated MA in risk groups suggests potential ventilatory instability.
- SPLI may serve as a biomarker, though its role requires further investigation.
Abstract:
In order to evaluate disturbances of the respiratory control in the first year of life in children with a statistically enhanced risk of SIDS, substance P-like immunoreactivity (SPLI) in plasma and mean apnoea duration (MA) were examined. 4 groups of infants were investigated: Controls, full-term infants with anamnestic SIDS-risk factors, preterm infants with additional risk factors and preterm infants without such factors. Infants aged from -4(corrected age) to 63 weeks. SPLI in plasma was determined by a specific, homologous radioimmunoassay. The SPLI-level was significantly higher in controls (n = 41; means +/- SE = 36.37 +/- 4.86 pg/ml) than in preterm infants without (n = 21; 25.41 +/- 5.54 pg/ml) or with additional anamnestic risk factors (n = 111; 25.89 +/- 3.09 pg/ml). SPLI was higher in full-term SIDS-risk infants (n = 150; 30.73 +/- 2.35 pg/ml) than in the preterm groups. There is a significant age dependence in the groups full-term SIDS-risk infants and preterm infants with additional risk factors. During maturation the SPLI-level in plasma rises in these groups from lower values. The MA-values were determined by means of a daytime polygraphy. There is an age dependence of the MA-values during active sleep in full-term SIDS-risk infants and in preterm infants with additional anamnestic risk factors. In the age group 4-17 weeks (peak of SIDS frequency) in active sleep the MA-values were significantly higher in all 3 risk groups than in the controls.(ABSTRACT TRUNCATED AT 250 WORDS)