Abstract
A study was undertaken in 15 patients to compare measured and assumed arteriovenous oxygen (A V O2) content, differences and their effects on resultant shunt calculations. All patients were on volume ventilators and demonstrated a stable cardiovascular state. Simultaneous measurements of the O2 content of a pulmonary artery (PA) and of a superior vena cava (SVC) sample were compared. A mean A V O2 content difference of 3.5±0.8 volumes percent was obtained from the PA and 2.6±1.1 volumes percent from the SVC. The resultant shunt calculations derived from measured A V O2 content differences were compared with the calculation based on an assumed A V O2 content difference of 5 volumes percent. A method for extapolating a 'true' A V O2 content difference from an SVC blood sample was obtained. The extrapolated value resulted in a more representative 'true shunt' calculation in 13 of the 15 patients.
Original language | English (US) |
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Pages (from-to) | 198-202 |
Number of pages | 5 |
Journal | Anesthesia and analgesia |
Volume | 54 |
Issue number | 2 |
DOIs | |
State | Published - 1975 |
ASJC Scopus subject areas
- Anesthesiology and Pain Medicine