Reassessment of the assumed A V oxygen content difference in the shunt calculation

R. A. Harrison; Richard Davison; B. A. Shapiro; Sheridan Norman Meyers

Reassessment of the assumed A V oxygen content difference in the shunt calculation

R. A. Harrison, Richard Davison, B. A. Shapiro, Sheridan Norman Meyers

Medicine, Cardiology Division

Research output: Contribution to journal › Article

16 Scopus citations

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)
Pages (from-to)	198-202
Number of pages	5
Journal	Anesthesia and Analgesia
Volume	54
Issue number	2
State	Published - Dec 1 1975

ASJC Scopus subject areas

Anesthesiology and Pain Medicine

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Harrison, R. A., Davison, R., Shapiro, B. A., & Meyers, S. N. (1975). Reassessment of the assumed A V oxygen content difference in the shunt calculation. Anesthesia and Analgesia, 54(2), 198-202.

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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.",

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N2 - 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.

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