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Dependence of oxygen consumption on oxygen delivery in children with hyperdynamic septic shock and low oxygen

S E Lucking1, T M Williams, F C Chaten

  • 1Department of Pediatrics, Children's Medical Center, Medical College of Virginia, Richmond.

Critical Care Medicine
|December 1, 1990
PubMed

Insights

Increasing oxygen delivery through packed red blood cell transfusions can boost oxygen consumption in children with hyperdynamic septic shock, even with initially low oxygen extraction. This may improve survival rates in pediatric septic shock patients.

Area of Science:

  • Pediatric Critical Care Medicine
  • Septic Shock Pathophysiology
  • Oxygen Transport Physiology

Background:

  • Hyperdynamic septic shock in children often involves impaired oxygen transport.
  • Assessing oxygen consumption (VO2) and oxygen delivery (DO2) is crucial for managing septic shock.
  • Low oxygen extraction (O2 extr) despite high DO2 may indicate critical illness.

Purpose of the Study:

  • To investigate the impact of increasing systemic oxygen delivery (DO2) via packed red blood cell (PRBC) transfusion on oxygen consumption (VO2) in pediatric hyperdynamic septic shock.
  • To determine if VO2 can be augmented by further increasing DO2 in patients with suboptimal oxygen extraction.

Main Methods:

  • Studied children with hyperdynamic septic shock and specific oxygen transport derangements (VO2 < 180 ml/min.m2, O2 extr < 24%).
  • Administered PRBC transfusions to increase DO2.
  • Monitored DO2, cardiac index, VO2, and O2 extr before and after transfusion.

Main Results:

  • PRBC transfusion significantly increased DO2 (p < .01) without altering cardiac index.
  • VO2 significantly increased post-transfusion (p < .01).
  • Oxygen extraction remained unchanged, indicating improved oxygen utilization.

Conclusions:

  • Increasing DO2 through PRBC transfusion can enhance VO2 in pediatric septic shock, even with initially low O2 extr.
  • Further DO2 enhancement should be considered in pediatric septic shock management due to VO2's correlation with survival.
  • The impact of this strategy on patient morbidity and mortality warrants further investigation.

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