SciELO - Scientific Electronic Library Online

vol.57 issue6Association between fasting blood glucose levels and perioperative morbimortality: retrospective study in surgical elderly patientsGeneral anesthesia after failed spinal block for emergency surgery in a patient with mucopolysaccharidosis: case report author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Brasileira de Anestesiologia

Print version ISSN 0034-7094On-line version ISSN 1806-907X


MOLL, Jorge R. et al. Oxygen concentrators: evolution of inspired concentration of oxygen and repercussions in an anesthetized patient with CO2 absorber system. Pilot study. Rev. Bras. Anestesiol. [online]. 2007, vol.57, n.6, pp.649-657. ISSN 0034-7094.

BACKGROUND AND OBJECTIVES: Resolution 1355/92 of the Conselho Federal de Medicina approved minimal standards for the installation and operation of oxygen concentrators (PSA) and recommended University Hospitals to undertake a prospective analysis in order to improve the system. It motivated this pilot study whose objective was to determine the clinical viability of using PSA oxygen by analyzing the variation in oxygen concentration in the fresh gas flow (FGF) outlet and in the inspired concentration of oxygen. METHODS: An observational study with 30 patients, ASA I, undergoing upper abdominal surgeries using a CO2 absorber system and fresh gas flow (FGF) O293 at 500 mL.min-1. Weight, age, type and duration of the surgery, inspired and expired fraction of CO2 (FiCO2, PETCO2); inspired fraction of O2 (FiO2); and O2 concentration (O2ent) in the FGF. The following parameters were measured after intubation and every 10 minutes until the end of the procedure: PETCO2, FiO2, and O2. Results underwent statistical analysis and p < 0.05 was considered significant. RESULTS: The inspired fraction of carbon dioxide was equal to zero in all patients and moments of the study, but there was a significant reduction in PETCO2 with time. The variables O2ent and FiO2 had similar tendencies with time (p = 0.1283), but the variable O2ent presented higher means (p < 0.001); evolution of mean O2ent and FiO2 was observed (p < 0.05). CONCLUSIONS: This study demonstrated that the use of PSA oxygen, within the conditions proposed for the experiment, is safe and induced a progressive increase in O293 in the FGF and of FiO2.

Keywords : EQUIPMENT, Oxygen concentrators; VENTILATION [mechanical controlled, basal flow].

        · abstract in Portuguese | Spanish     · text in English | Portuguese     · English ( pdf epdf ) | Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License