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Independently measured oxygen consumption during reduction of oxygen delivery by positive end-expiratory pressure. 1985

P E Pepe, and B H Culver

Oxygen consumption (VO2) is often assumed to be fixed by metabolic demand, but some investigators have found VO2 linearly dependent on O2 delivery (QT-CaO2) during positive end-expiratory pressure (PEEP) trials for the adult respiratory distress syndrome. However, in those studies VO2 was calculated using the same cardiac output (QT) and O2 content measurements used to calculate the O2 delivery to which it was being compared. We therefore obtained independent measurements of VO2, QT, and oxygen contents under 3 conditions in 21 dogs: 14 normal dogs, each receiving varying degrees of PEEP or central venous obstruction, and 7 dogs receiving PEEP after developing pulmonary edema from intravenously infused oleic acid. In all groups, VO2 measured from expired gas analysis remained unchanged until QT-CaO2 was reduced to below 13 ml/kg/min. The VO2 was then linearly dependent on QT-CaO2. We conclude that this reduction in VO2 is due to severe QT-CaO2 reduction and not to any special effect of PEEP or lung injury.

UI MeSH Term Description Entries
D010100 Oxygen An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration. Dioxygen,Oxygen-16,Oxygen 16
D010101 Oxygen Consumption The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346) Consumption, Oxygen,Consumptions, Oxygen,Oxygen Consumptions
D011175 Positive-Pressure Respiration A method of mechanical ventilation in which pressure is maintained to increase the volume of gas remaining in the lungs at the end of expiration, thus reducing the shunting of blood through the lungs and improving gas exchange. Positive End-Expiratory Pressure,Positive-Pressure Ventilation,End-Expiratory Pressure, Positive,End-Expiratory Pressures, Positive,Positive End Expiratory Pressure,Positive End-Expiratory Pressures,Positive Pressure Respiration,Positive Pressure Ventilation,Positive-Pressure Respirations,Positive-Pressure Ventilations,Pressure, Positive End-Expiratory,Pressures, Positive End-Expiratory,Respiration, Positive-Pressure,Respirations, Positive-Pressure,Ventilation, Positive-Pressure,Ventilations, Positive-Pressure
D002302 Cardiac Output The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat). Cardiac Outputs,Output, Cardiac,Outputs, Cardiac
D004285 Dogs The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065) Canis familiaris,Dog
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001158 Arteries The vessels carrying blood away from the heart. Artery

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