THE HALOSCALE "INFANTA" WRIGHT RESPIROMETER: An In Vitro and In Vivo Assessment

The performance of the Haloscale "Infanta" respirometer hasbeen assessed in vitro using ISO test compliances and resistances,and in vivo by comparison with pneumotachograph volumes in 13spontaneously breathing children and 13 children during intermittentpositive pressure ventilation. The Infanta was shown to be capableof registering volumes between 15 and 200 ml with an accuracyof ±5%. The registered volume decreased rapidly below15 ml, whilst above 200 ml over-registration developed.