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[The variability of arterial pressure measured by oscillometric methods in premature newborn infants]
Insights
Blood pressure measurement in premature infants using oscillometry is highly variable due to movement artifacts. The lowest oscillometric reading over multiple measurements may offer the most reliable data, unaffected by neonatal factors.
Area of Science:
- Neonatal physiology
- Medical instrumentation
Context:
- Premature infants require precise monitoring of vital signs, including blood pressure.
- Oscillometric methods are commonly used for non-invasive blood pressure measurement in neonates.
- Understanding the reliability of these measurements is crucial for clinical decision-making.
Purpose:
- To assess the variability and validity of oscillometric blood pressure measurement in premature infants.
- To identify potential influencing factors on measurement accuracy.
- To determine the optimal timing or method for obtaining reliable readings.
Summary:
- Blood pressure was measured 11 times over 20 minutes for three days in 30 premature infants (postnatal age ≥ 6 days).
- Movement significantly impacted oscillometric readings, limiting comparability with invasive methods.
- No specific measurement time yielded consistent results; the lowest daily reading showed the best inter-day correlation and was independent of neonatal/postnatal factors.
Impact:
- Highlights limitations of non-invasive oscillometric blood pressure monitoring in neonates.
- Suggests that the lowest recorded value across multiple readings may be the most reliable indicator.
- Informs clinical practice regarding the interpretation of blood pressure data in premature infants.
Abstract:
The variability of blood pressure measured by oscillometry and the validity of this technique were studied in premature infants. Thirty premature babies whose postnatal age was six days or more had their blood pressure measured 11 times over a twenty-minute period for three consecutive days. Movements were found to have a very substantial influence on results that could not be reliably compared with values obtained invasively. No consistent pattern of variations of oscillometric results obtained during the eleven measurements of use for recommending a specific measurement time was found. Diastolic blood pressure fell gradually over the three-day study period. The most reliable of the eleven daily values was the lowest value for which good correlations were found between the three study days; this lowest value was not influenced by neonatal or postnatal factors.