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- W2188191679 abstract "Thecharacteristics andperformance oftheVitalograph dryspirometer were studiedusing the criteria suggested bytheInternational LabourOrganisation (I.L.O.) Report on thestandardizationofrespiratory function testsinpneumoconiosis. Comparison was alsomade withthe Bernstein spirometer. Therecorder speed, activation volume, andaccuracy ofvolumecalibration andlinearity comply withmostofthesuggestions intheI.L.O. Report. Thecombinedresistance andinertia oftheVitalograph exceedthelimits cited inthereport, however, andarealsogreater thanthosereported fortheBernstein andotherspirometers. Nevertheless, theVitalograph calibrates wellagainst theBernstein forvital capacity andFEVymeasurementsmade innormal subjects andinpatients withobstructive airways disease. Itistherefore suggested thatitmaybe suitable fortheassessment offorced expiratory volumeandvital capacity inpatients andnormal subjects, orinpopulation surveywork.Thefactthatitislightweight, portable, androbustisalso an advantage. Thewidespread useof theVitalograph dry spirometer forassessments ofventilatory capacity inhospital patients, out-patients, orgeneral practice surgeries (British Medical Journal, 1968) and population surveys (Lowe,Pelmear, Campbell, Hitchins, Khosla, andKing,1968), and the absence, asyet,ofanypublished report onthis patented instrument3 ledtothis critical study of itsperformance. Theinvestigation wasundertaken alongthelines suggested intheInternational LabourOrganisation (I.L.O.) Report(Cotes, 1966) inconnexion withproposals forthestandardization oflungfunction tests. Inparticular, someaspects oftheVitalograph's performance werecompared withthose oftheBernstein lowresistance water-sealed spirometer (Bernstein, D'Silva, andMendel, 1952). Thetwoinstruments areillustrated inFigures 1and2.Somecomparisonsoftheirdimensions andotherphysical characteristics areshowninTableI,whichshows thattheBernstein spirometer achieves itshigh performance byeliminating inertia andresistance bytheextremely small massofitsrecording membersanditslarge-bore tubing. TheVitalograph utilizes a different physical principle, compensating fortheeffects ofinertia andresistance by spring forces controlling massandmassmovement." @default.
- W2188191679 created "2016-06-24" @default.
- W2188191679 creator A5051655503 @default.
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- W2188191679 date "1969-01-01" @default.
- W2188191679 modified "2023-09-24" @default.
- W2188191679 title "Characteristics oftheVitalograph spirometer" @default.
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- W2188191679 hasPublicationYear "1969" @default.
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