Bohr effect data for blood gas calculations.

Area of Science:

• Physiology
• Biochemistry
• Respiratory System

Background:

• The oxygen dissociation curve (ODC) describes hemoglobin's affinity for oxygen.
• The Bohr effect explains how blood pH and PCO2 influence O2 binding.
• 2,3-diphosphoglycerate (DPG) is a key regulator of ODC and oxygen delivery.

Purpose of the Study:

• To quantify the oxygen dissociation curve (ODC) and Bohr effect under diverse acid-base conditions.
• To investigate the impact of normal versus low 2,3-diphosphoglycerate (DPG) concentrations.
• To provide data for calculating ODC shifts in various physiological and pathophysiological states.

Main Methods:

• Measurement of ODC and Bohr effect in human blood.
• Manipulation of acid-base balance (pH, PCO2, Base Excess).
• Varying 2,3-diphosphoglycerate (DPG) concentrations (normal and low).

Main Results:

• The fixed-acid Bohr factor (H+ titration) remained relatively constant with O2 saturation.
• At normal DPG, the H+ Bohr factor was largely independent of PCO2.
• For low DPG, the H+ Bohr factor decreased with increasing PCO2.
• The CO2 Bohr factor varied significantly with O2 saturation and Base Excess, especially in low DPG blood.
• Bohr factors ranged from unmeasurable to -0.93 under tested conditions.

Conclusions:

• The Bohr effect is highly sensitive to DPG levels, PCO2, and acid-base status.
• These findings enable precise prediction of ODC shifts under various conditions.
• Understanding these variations is crucial for gas exchange analysis in health and disease.