body plethysmography - vyaire medical, inc. · body plethysmography typical curve shapes in health...

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Vyaire Medical, Inc.

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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