PatientSpirometry
●x1=Time
●x2=Vol
●y=Flow
PatientSpirometryloopsandwaveforms
Graphicalowandpressurewaveformsandpressure-volume(Paw-Vol)and
ow-volume(Flow-Vol)loopsenableimmediatedetectionofchangesinthepatient’s
ventilatorystatus.
ThePaw-Volloopillustratesthedynamicrelationshipbetweenpressureandvolume.
TheFlow-Volloopindicatestherelationshipbetweenowandvolume.
Paw-Volphases
●x1=PawcmH
2
O
●y1=Volml
●x2=Time
●y2=Paw
1.Startofinspiration
2.Inspiration
3.Pause
4.Expiration
NormalPaw-Volloop
TheshapeofthePaw-Volloopdependsonthepatient’srespiratorystatusandthe
ventilationmodeused.The“normal”Paw-Volloopappearsifonlyasmallpressureis
requiredbeforevolumestartsenteringthelungs.
334CARESCAPEModularMonitors2062971-001