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Related Experiment Videos

Reduced left ventricular function in hypoxemic newborn pigs: a strain Doppler echocardiographic study.

Wenche Bakken Børke1, Thor Edvardsen, Drude Fugelseth

  • 1Department of Pediatric Research, Institute for Surgical Research, Rikshospitalet University Hospital, N-0027 Oslo, Norway. w.b.borke@medisin.uio.no

Pediatric Research
|April 22, 2006
PubMed
Summary

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Neonatal asphyxia impairs heart function. Strain Doppler echocardiography revealed that longitudinal contraction is more vulnerable to hypoxemia than radial contraction in newborn pigs.

Area of Science:

  • Neonatal physiology
  • Cardiovascular research
  • Pediatric cardiology

Background:

  • Asphyxia in neonates can cause myocardial dysfunction, hypotension, and pulmonary hypertension.
  • Assessing left ventricular (LV) systolic function is crucial for understanding neonatal hypoxemic injury.

Purpose of the Study:

  • To evaluate left ventricular (LV) systolic function using strain Doppler echocardiography (SDE) in hypoxemic newborn pigs.
  • To investigate regional differences in myocardial contraction during hypoxemia and reoxygenation.

Main Methods:

  • Induction of hypoxemia in anesthetized newborn pigs by ventilation with 8% O2.
  • Echocardiography performed at baseline, during hypoxemia, and during reoxygenation.
  • Measurement of longitudinal and radial myocardial strain using SDE.

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Main Results:

  • Hypoxemia induced heterogeneous changes in LV systolic function, with longitudinal shortening shifting to stretching in some segments.
  • Radial contraction (short-axis strain) amplitude was reduced and delayed but remained positive.
  • Longitudinal systolic contraction was more susceptible to hypoxemic insults than radial contraction.

Conclusions:

  • Strain Doppler echocardiography (SDE) can assess rapid changes in LV function during hypoxemia and reoxygenation in neonates.
  • Neonatal hypoxemia causes complex and heterogeneous myocardial dysfunction with regional variations.
  • Both longitudinal and radial functions must be considered for a comprehensive assessment of global hypoxemic injury.