Measurement of oxygen consumption in infants.

Measurement of oxygen consumption in infants.

Independent measurement of oxygen consumption and oxygen delivery.

This experiment investigated the relationship between oxygen consumption and oxygen delivery (cardiac output X arterial oxygen content) in an acute canine model. Previous studies investigating this relationship have largely utilized methods in which oxygen consumption and oxygen delivery were each calculated using the same measured variables resulting in mathematical coupling of variables. In t...

Circadian variation on oxygen consumption in preterm infants.

OBJECTIVE We investigated the diurnal variation in oxygen consumption to determine the optimal time periods of calorimetry in preterm infants. METHODS Oxygen consumption (VO(2)) was measured continuously for 24 h using indirect calorimetry. Twenty-two premature infants with gestational age of 27-31 (31+/-1.7) weeks were enrolled in the study. Heart rate, respiratory rate, oxygen saturation, s...

Simple and versatile method for measuring oxygen consumption in infants.

A simple, rapid, and accurate method for measuring oxygen consumption in infants is described. Expired gas is entrained in a stream of air drawn through a gently applied face mask. Oxygen consumption is derived from (1) gas flow rate, measured with a flowmeter, and (2) the fall in oxygen concentration of the gas mixture, measured with a paramagnetic analyser. A measurement can be made at the be...

Measurement of oxygen consumption by murine tissues in vitro.

INTRODUCTION A novel in vitro system was developed to measure O₂ consumption by murine tissues over several hours. METHODS Tissue specimens (7-35 mg) excised from male Balb/c mice were immediately immersed in ice-cold Krebs-Henseleit buffer, saturated with 95% O₂:5% CO₂. The specimens were incubated at 37 °C in the buffer, continuously gassed with O₂:CO₂ (95:5). [O₂] was determined as a funct...