Assessment of accuracy of the Vacu-Med 17053 calibrator for ventilation, oxygen uptake (V(O(2))), and carbon dioxide production (V(CO(2)))

Respir Care. 2011 Apr;56(4):472-6. doi: 10.4187/respcare.00951. Epub 2011 Jan 21.

Abstract

Background: Few have examined the accuracy of mechanical calibrators used to calibrate metabolic monitors.

Objective: To evaluate the Vacu-Med 17053 motorized syringe calibrator for accuracy against the accepted standard method: the Douglas bag.

Methods: We tested oxygen consumption values (V(O(2))) of 522-3,210 mL/min. We mixed room air and calibration gases in the pumping syringes of the Vacu-Med 17053 and evacuated those gases into a Douglas bag, measured the Douglas bag volumes and concentrations, and converted to pulmonary ventilation, V(O(2)), and carbon dioxide production (V(CO(2))).

Results: The Vacu-Med 17053 calibrator overestimated V(O(2)) by a mean 28.6 mL/min (1.3% error), underestimated V(CO(2)) by 6.9 mL/min (-1.7% error), and underestimated pulmonary ventilation by 0.98 L/min (-1.4% error). The V(O(2)) and V(CO(2)) differences between the calibrator and the Douglas bag were larger at higher V(O(2)) levels.

Conclusions: The V(O(2)) and V(CO(2)) differences might be attributable to fluctuations of the calibrator settings. The Vacu-Med 17053 calibrator was accurate with the application of a mathematical correction.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calibration
  • Carbon Dioxide / metabolism*
  • Humans
  • Linear Models
  • Monitoring, Physiologic / instrumentation*
  • Oxygen Consumption / physiology*
  • Pulmonary Ventilation*

Substances

  • Carbon Dioxide