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Peripheral pulmonary vascular resistance

F Schrijen1, C Saunier, F Chabot

  • 1Institut National de la Santé et de la Recherche Médicale Unité 14, Vandoeuvre, France.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1993
PubMed
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This study developed a method to measure peripheral pulmonary vascular resistance in dogs. The technique accurately assessed pressure-flow relationships, showing increased resistance during hypoxia.

Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Circulation Research

Background:

  • Understanding the pressure-flow relationship in peripheral lung vasculature is crucial for diagnosing and treating pulmonary diseases.
  • Previous methods often lacked precision or were confounded by systemic circulation effects.

Purpose of the Study:

  • To establish and validate a novel method for measuring peripheral pulmonary vascular resistance (PPVR) in dogs.
  • To assess the pressure-flow dynamics in a wedged pulmonary artery segment.
  • To evaluate the impact of hypoxia on PPVR using this new technique.

Main Methods:

  • Utilized a double-lumen catheter wedged in a distal pulmonary artery of anesthetized dogs.
  • Infused mixed venous blood to measure perfusion pressure and flow (0-9.2 ml/min).
  • Analyzed pressure-flow curves, calculating peripheral pulmonary vascular resistance and its correlation with wedged area volume.

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Main Results:

  • The pressure-flow relationship in coaxial areas showed a negligible intercept and no significant flow-dependent hysteresis.
  • Peripheral pulmonary vascular resistance varied between sites, inversely correlated with wedged area volume (r = -0.35, P < 0.05).
  • Hypoxia (FiO2 = 0.10) significantly increased the slope (PPVR) by 71%.

Conclusions:

  • The described wedged catheter technique provides a reliable method for assessing peripheral pulmonary vascular resistance.
  • This method is suitable for studying physiological and pharmacological interventions on pulmonary vessels without systemic interference.
  • The findings highlight the significant impact of hypoxia on peripheral pulmonary vascular resistance.