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Positive end-expiratory pressure does not decrease cardiac output during laparoscopic liver surgery: A prospective

Denis Bernard1, Antoine Brandely1, Olivier Scatton2

  • 1Department of Anesthesiology and Critical Care Medicine, St-Antoine University Hospital, Paris, France.

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Summary
This summary is machine-generated.

Positive end-expiratory pressure (PEEP) may prevent vena cava collapse during laparoscopic liver surgery. Applying PEEP during pneumoperitoneum did not decrease cardiac index, suggesting it can mitigate hemodynamic changes.

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Area of Science:

  • Anesthesiology
  • Cardiovascular Physiology
  • Thoracic Surgery

Background:

  • Positive end-expiratory pressure (PEEP) offers pulmonary benefits but can exacerbate hemodynamic issues from pneumoperitoneum (PNP) in liver resection.
  • PEEP might counteract PNP-induced vena cava (VC) collapse by elevating intraluminal VC pressures.

Purpose of the Study:

  • To investigate whether PEEP can prevent vena cava collapse during laparoscopic liver resection with pneumoperitoneum.

Main Methods:

  • Prospective evaluation of 20 patients with IRB approval and informed consent.
  • Measurements taken before and after 10 cmH2O PEEP in a control group (no PNP) and during 12 cmH2O PNP.
  • Paired-sample t-tests used for statistical comparison.

Main Results:

  • PEEP decreased cardiac index (CI) in the control group (P < 0.05).
  • PEEP did not significantly alter CI when applied during established PNP.
  • PNP reduced transmural abdominal vena cava pressure, an effect partially reversed by PEEP.

Conclusions:

  • In normovolemic patients undergoing laparoscopic liver resection, PEEP applied during PNP did not reduce CI.
  • Analysis of transmural VC pressure supports PEEP's role in preventing PNP-induced vena cava collapse.