Early Life Microcirculatory Plasticity and Blood Pressure Changes in Low Birth Weight Infants Born to Normotensive
Muti Goloba1,2, Rajendra Raghuraman1, Nansi Botros1
1Molecular and Clinical Sciences Research Institute, St George's, University of London, London, UK.
Insights
Low birth weight infants show early capillary remodeling, not the capillary rarefaction seen in essential hypertension. Further studies are needed to understand long-term changes in capillary density and blood pressure.
Area of Science:
- Cardiovascular Research
- Pediatric Health
- Hypertension Studies
Background:
- Capillary rarefaction (CR) is a known indicator of essential hypertension (EH).
- Low birth weight (LBW) infants are at increased risk for developing EH later in life.
Purpose of the Study:
- To investigate early changes in capillary density (CD) and blood pressure (BP) in LBW infants.
- To assess the relationship between birth weight and cardiovascular risk factors in infancy.
Main Methods:
- A longitudinal multicenter study involving 77 LBW and 284 normal birth weight (NBW) infants.
- Intravital capillaroscopy used to measure basal and maximal capillary density at birth, 3, 6, and 12 months.
- Blood pressure measurements taken longitudinally.
Main Results:
- LBW infants exhibited higher initial CD, followed by significant CR within 3 months, reaching NBW levels.
- NBW infants showed a gradual CD reduction from birth to 12 months.
- Non-Caucasian ethnicity and preterm birth predicted higher birth CD; systolic BP increased in NBW infants, negatively correlating with MCD.
Conclusions:
- LBW infants undergo early "accelerated capillary remodeling," normalizing their initial high CD.
- This remodeling process does not appear to explain the CR observed in adults with or at risk of EH.
- Further research is required to elucidate the timing and mechanisms of CR development post-infancy.
Background:
Capillary rarefaction (CR) is an established hallmark of essential hypertension (EH). The aim of this study was to examine early changes in capillary density (CD) and blood pressure (BP) in low birth weight (LBW) infants who are at risk of developing EH in later life.
Methods:
We studied 77 LBW infants and 284 normal birth weight (NBW) infants, all born to mothers with normotension, in a longitudinal multicenter study. Intravital capillaroscopy was used to measure functional basal capillary density (BCD) and maximal capillary density (MCD) at birth, 3, 6, and 12 months.
Results:
We found that LBW infants, born preterm and at term, had a significantly higher CD at birth, then underwent significant CR in the 1st 3 months culminating in a CD similar to that seen in NBW infants. NBW infants showed a gradual reduction in CD between birth and 12 months. Non-Caucasian ethnicity and preterm birth were significant predictors of a higher CD at birth. Systolic BP in NBW infants increased significantly from birth to 3 months, and we identified a significant negative correlation between systolic BP and MCD.
Conclusions:
This study has identified a process of early "accelerated capillary remodeling" in LBW infants, which corrects their higher CD at birth. This remodeling is unlikely to explain the CR seen in adult individuals with, or at risk of developing EH. Further follow-up studies are required to determine the timing and mechanisms involved in CR, which is likely to occur after the 1st year of life but before early adulthood.
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