body plethysmography - vyaire medical, inc. · body plethysmography typical curve shapes in health...
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G L O B A L H E A D Q U A R T E R S
Vyaire Medical, Inc.
26125 N. Riverwoods Blvd.
Mettawa, IL 60045
USA vyaire.com
Parameter Description
(Sp
ecifi
c) a
irwa
yre
sist
anc
es
sRaw (sReff, sRtot, sRmid) Specific airway resistance
sGaw = sRaw-1 Specific airway conductance
Raw (Reff, Rtot, Rmid) Airway resistance
Gaw = Raw-1 Airway conductance
Ab
solu
te lu
ng
volu
mes
TLC Total lung capacity
FRCpleth Functional residual capacity
RV Residual volume
Slow
Spiro
met
ry
VT Tidal volume
BF Breathing frequency
IRV Inspiratory reserve volume
ERV Expiratory reserve volume
IC Inspiratory capacity
VC IN Inspiratory vital capacity
VC EX Expiratory vital capacity
Forc
ed FEV1 Forced expiratory volume in 1 s
FVC Forced vital capacity
sRAW Loops FRCpleth curves Linked ManeuverLinked Maneuver
Body Plethysmography
Typical Curve Shapes in Health and Disease
Breathing Maneuvers
sRAWLoops
OptionalForced
Spirometry
Healthy
All illustrations, descriptions and technical specifications are subject to change without prior notice.
Restriction
Decreased volume, lower resistance in Vtg
Morbid Obesity
Increased resistance during expiration = higher WOB
Emphysema (diffuse)
Increases airway resistance, increased thoracic gas volume
Central Obstruction
Normal VtG, increased airway resistance
Stenosis
Increased airway resistance due to physiological obstruction