Comparison of Brody's formula with respiratory gas analysis for estimating oxygen consumption in anaesthetized dogs.

Objective: To determine agreement in oxygen consumption (V˙O) values calculated using Sykes' formula V˙O = (FiO - Fe'O) * V˙ (where Fi and Fe are the inspired and end-tidal fractional concentrations of O, respectively, and V˙ is minute volume) with values derived using Brody's formula (V˙O = 10 kg). It was hypothesized that the two methods would not yield statistically significant differences in calculated values.

Study Design: Prospective, clinical, pilot study.