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Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model
Published on: August 4, 2012
The oxyhemoglobin dissociation curve in liver cirrhosis
Thierry Clerbaux1, Bruno Detry1, Andre Geubel2
1Department of Internal Medicine, Divisions of Pneumology, Cliniques Universitaires Saint-Luc Brussels, Brussels, Belgium.
Insights
Cirrhotic patients show increased dispersion in oxygen saturation, indicating altered hemoglobin-oxygen binding. This may be influenced by factors beyond standard blood gas parameters.
Area of Science:
- Cardiology
- Hepatology
- Pulmonology
Background:
- Cirrhosis affects oxygen transport.
- Orthotopic liver transplantation (OLT) candidates require precise physiological assessment.
Purpose of the Study:
- To characterize the oxyhemoglobin dissociation curve (ODC) in stable cirrhotic patients awaiting OLT.
- To identify factors influencing ODC in this population.
Main Methods:
- Prospective cohort study comparing 50 cirrhotic patients with 50 healthy controls.
- Whole blood ODC tracing under standard conditions.
- Measurement of 2,3-diphosphoglycerate (2,3 DPG), plasma ions, and arterial blood gases.
Main Results:
- Mean ODC was similar between groups.
- Cirrhotic patients exhibited significantly greater dispersion of PO2 values for given oxygen saturation levels (SO2%).
- P50 in cirrhotic patients was influenced by chloride, inorganic phosphate, and 2,3 DPG, but not by sodium, potassium, or calcium.
Conclusions:
- Increased ODC dispersion in cirrhosis may stem from altered enzymes, hypothyroidism, medications (diuretics, propranolol), or plasma ion disturbances.
- ODC characterization should include shape, position, and dispersion; factors beyond standard parameters influence ODC position.
Study Objectives:
To trace the entire oxyhemoglobin dissociation curve (ODC) in a cohort of cirrhotic patients in stable condition who were candidates for orthotopic liver transplantation (OLT).
Design:
Prospective cohort study.
Setting:
A large academic hospital.
Patients And Methods:
We traced the entire ODC in whole blood in standard conditions (pH 7.4; PCO2, 40 mm Hg; temperature, 37 degrees C) for 50 cirrhotic candidates for OLT (27 men and 23 women) and 50 age- and height-matched healthy subjects (27 men and 23 women). All subjects were nonsmokers or ex-smokers for at least 5 years. We also measured 2,3 diphosphoglycerate (2,3 DPG) in RBCs, plasma ions, and arterial blood gases in all subjects according to standard methods. Mixed venous blood was also obtained from the 50 cirrhotic patients.
Results:
Mean ODC was the same in the two groups. However, for the cirrhotic patients, the dispersion of the PO2 values of oxygen saturation percentage (SO2%) from 20 to 80% was significantly larger (p < 0.01 to p < 0.0001). In the cirrhotic patients, the mean PO2 for half-saturation of hemoglobin (P50) was 7.11 + 0.14 mEq/L chloride (p < 0.001) plus 0.36 mEq/L inorganic phosphate (p < 0.05) plus 0.25 micromol/gram of hemoglobin (gHb) 2,3 DPG (p < 0.00002) in absolute numerical values. Sodium, potassium, and calcium, three plasma ions disturbed in cirrhotic patients, did not contribute to determine the mean P50.
Discussion:
In patients with cirrhosis, increased dispersion of PO2 values for a given level of SO2% may be related to four factors: (1) an observed alteration of the enzymes controlling the phosphoglycerate shunt; (2) hypothyroidism, which may affect 7 to 20% of patients with primary biliary cirrhosis; (3) the type of ongoing treatment, eg, diuretics and/or propranolol; and (4) plasma ion disturbances.
Conclusions:
We describe the ODC by three indexes: shape, position, and an index of dispersion of the PO2 values for a given level of SO2%. In addition, when the latter is increased, we suggest that other factors than pH, temperature, carbon dioxide, and inorganic phosphates are acting on the position of the ODC.
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