GSBS Student Publications


Simultaneous measurement of hepatic tissue pH, venous oxygen saturation and hemoglobin by near infrared spectroscopy

Student Author(s)

Tania Khan

GSBS Program

Interdisciplinary Graduate Program

UMMS Affiliation

Department of Surgery; Department of Anesthesiology



Document Type


Medical Subject Headings

Animals; Hemodynamics; Hemoglobins; Hydrogen-Ion Concentration; Least-Squares Analysis; Liver; Oxygen; Resuscitation; Shock, Hemorrhagic; Spectroscopy, Near-Infrared; Swine


Anesthesiology | Life Sciences | Medicine and Health Sciences | Surgery


The purpose of this study was to investigate the feasibility of using near infrared (NIR) spectroscopy of the liver to simultaneously assess oxygen content in combination with tissue pH, an indicator of anaerobic metabolism. Six anesthetized swine were subjected to 45 min of hemorrhagic shock followed by resuscitation with blood and crystalloid. Calibration models between NIR spectra and reference measurements of tissue pH, hepatic venous oxygen saturation (S(V)O2), and blood hemoglobin concentration (Hb) were developed using partial least-squares regression. Model accuracy was assessed using cross validation. The average correlation (R2) between NIR and reference measurements was 0.87, 0.68, and 0.93, respectively for pH, Hb, and S(V)O2. Estimated accuracy, the root mean squared deviation between spectral, and reference measurements was 0.03 pH units, 0.3 g/dL, and 6%. NIR determination of hepatic oxygen content and tissue pH during shock and resuscitation demonstrated that there can be a variance between hepatic venous oxygenation and regional tissue acidosis. NIR spectroscopy provides a technique to explore the implications of post-shock depression of tissue pH and evaluate new methods of resuscitation.

Rights and Permissions

Citation: Shock. 2001 Feb;15(2):106-11.

Related Resources

Link to Article in PubMed

Journal Title

Shock (Augusta, Ga.)

PubMed ID