D Samolski1, A Antón, R Güell, F Sanz, J Giner, P Casan. 1. Respiratory Dept., Hospital de la Santa Creu i Sant Pau, Sant Antoni M(a) Claret 167, 08025 Barcelona, Spain. dsamolski@hsp.santpau.es
Abstract
INTRODUCTION: Non-invasive positive pressure ventilation (NIPPV) is an effective treatment in respiratory failure. Continuous positive pressure (CPAP) may also be useful in acute hypoxaemic patients. Supplementary oxygen is usually necessary in both systems. However, the inspired oxygen fraction (FiO2) delivered by a NIV portable ventilator is unknown. The main objectives of this study were to establish the maximal FiO2 that could be achieved by these devices and to analyse the FiO2 determinant factors. METHOD:Ten healthy volunteers were evaluated using a BiPAP ST30 ventilator (Respironics, USA) with a single-limb circuit, expiratory port and nasal mask (Respironics, USA). Oxygen (15 L/min) was administered at two connection points (proximal and distal). Each volunteer carried out a NIPPV (inspiratory pressure 20 cmH2O [1.95 kPa]-expiratory pressure 8 cmH2O [0.78 kPa]) and a CPAP (10 cmH2O [0.981 kPa]) session. FiO2 was analysed by a probe located in the mask. Minute volume (MV) was measured using a pneumotachograph. RESULTS:Maximal FiO2 was obtained with CPAP and distal oxygen connection point (67.39 +/- 15.39%). NIPPV achieved higher MV than CPAP. FiO2 was inversely correlated with MV. CONCLUSIONS:FiO2 obtained while using a NIPPV portable ventilator depends on the ventilatory assistant mode, the oxygen connection point and the MV reached.
RCT Entities:
INTRODUCTION: Non-invasive positive pressure ventilation (NIPPV) is an effective treatment in respiratory failure. Continuous positive pressure (CPAP) may also be useful in acute hypoxaemicpatients. Supplementary oxygen is usually necessary in both systems. However, the inspired oxygen fraction (FiO2) delivered by a NIV portable ventilator is unknown. The main objectives of this study were to establish the maximal FiO2 that could be achieved by these devices and to analyse the FiO2 determinant factors. METHOD: Ten healthy volunteers were evaluated using a BiPAP ST30 ventilator (Respironics, USA) with a single-limb circuit, expiratory port and nasal mask (Respironics, USA). Oxygen (15 L/min) was administered at two connection points (proximal and distal). Each volunteer carried out a NIPPV (inspiratory pressure 20 cmH2O [1.95 kPa]-expiratory pressure 8 cmH2O [0.78 kPa]) and a CPAP (10 cmH2O [0.981 kPa]) session. FiO2 was analysed by a probe located in the mask. Minute volume (MV) was measured using a pneumotachograph. RESULTS: Maximal FiO2 was obtained with CPAP and distal oxygen connection point (67.39 +/- 15.39%). NIPPV achieved higher MV than CPAP. FiO2 was inversely correlated with MV. CONCLUSIONS:FiO2 obtained while using a NIPPV portable ventilator depends on the ventilatory assistant mode, the oxygen connection point and the MV reached.
Authors: Carmen Sílvia Valente Barbas; Alexandre Marini Isola; Augusto Manoel de Carvalho Farias; Alexandre Biasi Cavalcanti; Ana Maria Casati Gama; Antonio Carlos Magalhães Duarte; Arthur Vianna; Ary Serpa Neto; Bruno de Arruda Bravim; Bruno do Valle Pinheiro; Bruno Franco Mazza; Carlos Roberto Ribeiro de Carvalho; Carlos Toufen Júnior; Cid Marcos Nascimento David; Corine Taniguchi; Débora Dutra da Silveira Mazza; Desanka Dragosavac; Diogo Oliveira Toledo; Eduardo Leite Costa; Eliana Bernardete Caser; Eliezer Silva; Fabio Ferreira Amorim; Felipe Saddy; Filomena Regina Barbosa Gomes Galas; Gisele Sampaio Silva; Gustavo Faissol Janot de Matos; João Claudio Emmerich; Jorge Luis Dos Santos Valiatti; José Mario Meira Teles; Josué Almeida Victorino; Juliana Carvalho Ferreira; Luciana Passuello do Vale Prodomo; Ludhmila Abrahão Hajjar; Luiz Cláudio Martins; Luiz Marcelo Sá Malbouisson; Mara Ambrosina de Oliveira Vargas; Marco Antonio Soares Reis; Marcelo Brito Passos Amato; Marcelo Alcântara Holanda; Marcelo Park; Marcia Jacomelli; Marcos Tavares; Marta Cristina Paulette Damasceno; Murillo Santucci César Assunção; Moyzes Pinto Coelho Duarte Damasceno; Nazah Cherif Mohamad Youssef; Paulo José Zimmermann Teixeira; Pedro Caruso; Péricles Almeida Delfino Duarte; Octavio Messeder; Raquel Caserta Eid; Ricardo Goulart Rodrigues; Rodrigo Francisco de Jesus; Ronaldo Adib Kairalla; Sandra Justino; Sérgio Nogueira Nemer; Simone Barbosa Romero; Verônica Moreira Amado Journal: Rev Bras Ter Intensiva Date: 2014 Apr-Jun