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Albumin mixed with meconium attenuates pulmonary dysfunction in a newborn piglet model with meconium aspiration
Per Arne Tølløfsrud1, Sverre Medbø, Anne Beate Solas
1Department of Pediatric Research, National Hospital, NO-0027, Oslo, Norway. p.a.tollofsrud@klinmed.uio.no
Abstract:
We hypothesized that lipids and bile acids in meconium may induce pulmonary insufficiency in newborns. Because albumin may bind these components we studied the effect of albumin on meconium-induced lung injury in piglets. We measured concentration of FFA in the meconium (110 mg dry weight/mL) and added albumin to provide a molar FFA to albumin ratio of 1:1. Newborn piglets, 0-2 d of age, artificially ventilated and exposed to hypoxemia by ventilation with 8% O2, were randomized to group A receiving meconium (n = 12) or group B receiving meconium + albumin (n = 12), 3 mL/kg intratracheally. The animals were reoxygenated for 8 h. Reoxygenation was started when mean blood pressure was <20 mm Hg or base excess was <-20 mM. Pulmonary function was assessed in parallel with pulmonary hemodynamics. From the start of reoxygenation and the next 8 h we found a significant difference (by ANOVA) between the two groups in oxygenation index (p = 0.005), with an increase from 1.6 +/- 0.2 to 6.1 +/- 6.8 (p = 0.04) in the meconium group and from 1.8 +/- 0.3 to 3.1 +/- 3.1 (NS) in meconium + albumin group. There were also significant differences (by ANOVA) between the groups in favor of the treatment group concerning need of inspired fraction of O2, mean airway pressure, dynamic compliance of the respiratory system, time constant, ventilation index, and pulmonary vascular resistance. In conclusion, albumin given concurrently with meconium significantly reduced detrimental effects of meconium aspiration in the lungs of newborn piglets.
Insights
Albumin administration significantly mitigated lung injury in newborn piglets caused by meconium aspiration. This treatment improved oxygenation and respiratory function, offering a potential therapeutic strategy for neonatal respiratory distress.
Area of Science:
- Neonatal Physiology
- Pulmonary Medicine
- Biochemistry
Background:
- Meconium aspiration syndrome is a significant cause of neonatal respiratory distress.
- Lipids and bile acids in meconium are suspected to induce lung injury.
- Albumin's binding properties suggest a potential protective role.
Purpose of the Study:
- To investigate the effect of albumin on meconium-induced lung injury in newborn piglets.
- To determine if albumin can ameliorate the pulmonary and hemodynamic consequences of meconium aspiration.
Main Methods:
- Newborn piglets were intratracheally administered meconium or meconium with albumin.
- Animals were ventilated and exposed to hypoxemia, followed by 8 hours of reoxygenation.
- Pulmonary function and hemodynamics were assessed, comparing the meconium and meconium + albumin groups.
Main Results:
- The meconium + albumin group showed significantly improved oxygenation index compared to the meconium-only group.
- Albumin treatment led to significant differences in oxygen requirements, airway pressure, dynamic compliance, and pulmonary vascular resistance.
- Albumin significantly reduced the detrimental effects of meconium aspiration.
Conclusions:
- Albumin administration concurrently with meconium significantly reduces lung injury in newborn piglets.
- Albumin shows promise as a therapeutic agent to mitigate meconium aspiration-related respiratory compromise in neonates.