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Respiratory changes in human red cells.

G Aliberti1, M Proietta, I Pulignano

  • 1Dipartimento di Scienze Cliniche, Università di Roma La Sapienza, Rome, Italy. giuseppe.aliberti@uniroma1.it

Clinical and Laboratory Haematology
|February 15, 2002
PubMed
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Human red blood cells show physiological respiratory changes. These red cell parameter shifts in pulmonary versus radial arteries suggest cyclic modifications linked to the CO2 Jacobs-Stewart cycle.

Area of Science:

  • Physiology
  • Hematology
  • Cardiovascular Science

Background:

  • Red blood cell (RBC) parameters are crucial for oxygen transport.
  • Understanding physiological variations in RBCs is essential for interpreting blood gas analyses and patient conditions.

Purpose of the Study:

  • To investigate physiological respiratory changes in human red blood cells.
  • To measure automated red cell parameters in arterial blood samples from different locations.

Main Methods:

  • Automated red cell parameters were measured in blood samples from the pulmonary and radial arteries (n=86) and pulmonary artery and aorta (n=23) of patients undergoing aorto-coronary bypass.
  • Statistical analysis was performed to compare parameters between arterial sampling sites.

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Main Results:

  • Significantly higher mean corpuscular volume, hematocrit, and red cell distribution width were observed in pulmonary arterial blood compared to radial arterial blood.
  • A lower mean corpuscular hemoglobin concentration was found in pulmonary arterial blood versus radial arterial blood.
  • No significant differences were noted in hemoglobin concentration, red blood cell count, or mean corpuscular hemoglobin.

Conclusions:

  • The study suggests cyclic respiratory modifications in red cell parameters.
  • These observed changes are potentially attributable to the CO2 Jacobs-Stewart cycle.
  • Arterial blood sampling location can influence measured red blood cell indices.