Use Instructions

Page 95/233
MasterScope - Instructions for Use
Version 03.00 • Date 19FEB2020
Definition of VC and IVC
The VC is the volume change at the mouth between the position of full inspiration
and complete expiration, expressed in litres at BTPS. The slow VC can be derived
in two ways. The expiratory vital capacity (EVC) is the maximal volume of air from
the point of maximal inhalation. The IVC or VCin is the maximal volume of air
inhaled from the point of maximal exhalation, achieved by an unforced exhalation
from end-tidal inspiration. These maneuvers are unforced, except at the point of
reaching RV or TLC, respectively, where extra effort is required.
9.2 Slow Spirometry (VC and IC)
Tracing of tidal breathing followed by an inspiratory maneuver to total lung capacity
(TLC) followed by a full but not forceful expiration to residual volume (RV) to record EVC
or VCex; FRC: functional residual capacity.
Tracing of tidal breathing followed by an expiratory maneuver to residual volume (RV),
followed by a full inspiration to total lung capacity (TLC) to record IVC or VCin. FRC:
functional residual capacity; ERV: expiratory reserve volume.