The Haloscale "Infanta" Wright respirometer. An in vitro and in vivo assessment.

The performance of the Haloscale "Infanta" respirometer has been assessed in vitro using ISO test compliances and resistances, and in vivo by comparison with pneumotachograph volumes in 13 spontaneously breathing children and 13 children during intermittent positive pressure ventilation. The Infanta was shown to be capable of registering volumes between 15 and 200 ml with an accuracy of +/- 5%. The registered volume decreased rapidly below 15 ml, whilst above 200 ml over-registration developed.