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Changes in pulmonary vein flow pattern during volume loading

O A Smiseth1, K Lødemel, F Riddervold

  • 1Medical Department B, National Hospital, Oslo, Norway.

Cardiovascular Research
|March 1, 1993
PubMed
Summary
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Increased left ventricular filling pressure significantly alters pulmonary vein flow patterns. The pulmonary vein flow (PVQ) waves reflect left atrial pressure changes, with flow during atrial contraction varying inversely with pressure.

Area of Science:

  • Cardiovascular Physiology
  • Hemodynamics
  • Diagnostic Imaging

Background:

  • Pulmonary vein flow (PVQ) patterns are influenced by cardiac pressures.
  • Understanding these patterns can provide insights into cardiac function.

Purpose of the Study:

  • To investigate how elevated left ventricular filling pressure affects pulmonary vein flow patterns.
  • To determine if PVQ changes can serve as an indicator of filling pressures.

Main Methods:

  • Pulmonary vein flow was measured using an ultrasonic transit time flow meter in anesthetized dogs.
  • Left atrial pressure was increased through stepwise volume loading.
  • A flow ratio was calculated to quantify the impact of atrial contraction on PVQ.

Main Results:

Related Experiment Videos

  • Volume loading induced distinct positive and negative PVQ waves, mirroring left atrial pressure waves.
  • Peak PVQ increased and minimum PVQ decreased significantly with loading.
  • The ratio of flow during atrial contraction to the rest of the cycle decreased inversely with mean left atrial pressure.

Conclusions:

  • Marked changes in PVQ patterns occur with increased left ventricular filling pressure.
  • PVQ waves correlate with left atrial pressure dynamics.
  • The PVQ flow ratio shows potential as an index for left ventricular filling pressure.