Open AccessSIMULTANEOUS MEASUREMENT OF HEPATIC TISSUE pH, VENOUS OXYGEN SATURATION AND HEMOGLOBIN BY NEAR INFRARED SPECTROSCOPY
Author(s) -
Babs R. Soller,
N. Cingo,
Juan Carlos Puyana,
Tania Khan,
Charles Hsi,
H Kim,
Janice Favreau,
Stephen O. Heard
Publication year - 2001
Publication title -
shock
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 117
eISSN - 1540-0514
pISSN - 1073-2322
DOI - 10.1097/00024382-200115020-00005
Subject(s) - hemoglobin , oxygen , oxygenation , chemistry , resuscitation , venous blood , near infrared spectroscopy , anaerobic exercise , deoxygenated hemoglobin , shock (circulatory) , oxygen saturation , anesthesia , biomedical engineering , medicine , biochemistry , biology , physiology , organic chemistry , neuroscience
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.