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- E Benjamin and J M Oropello.
- Department of Surgery, Mount Sinai Medical Center, City University of New York, New York, USA.
- Crit Care Clin. 1996 Jul 1; 12 (3): 587-601.
AbstractGastrointestinal tonometry is supposed to diagnose gut mucosal hypoxia using gastric luminal PCO2 and arterial bicarbonatemia, which are substituted in a modified Henderson-Hasselbach equation. This article reviews some of the problems inherent to the multiple assumptions underlying this technique. Tonometry is influenced by several local factors and by systemic acid-base imbalances that are unrelated to oxygenation. Tonometry is a rather crude and cumbersome method of gut capnometry, a technology that may provide valuable information regarding visceral perfusion, but not necessarily oxygenation.
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