Comparative Study

Investigation of oesophageal photoplethysmographic signals and blood oxygen saturation measurements in cardiothoracic surgery patients.

Physiol Meas. 2002 Aug 1;23(3):533-45.
Comparative Study

Esophageal pulse oximetry utilizing reflectance photoplethysmography.

IEEE Trans Biomed Eng. 2002 Nov 1;49(11):1360-8.
Comparative Study

Accuracy of pulse oximetry in the intensive care unit.

Intensive Care Med. 2001 Oct 1;27(10):1606-13.