When spirogram is not acceptable and not reproducible.
Then we look for type of F-V abnormalities in Unacceptable (Questionable) spirogram such as Variable effort, Notch: A notch in initial part indicates a cough or hesitant start.
A Study of forced expiratory spirogram
in south Indian beedi smokers and cigarette smokers.
For diagnostic purposes there have to be two or three acceptable spirograms
in preschool or school-age children, respectively.
Diagnostic studies, including radiographs, spirograms
and analysis of blood, were performed at the discretion of the clinician.
Calibrations and the measurements were performed in accordance with guidelines recommended by American Thoracic Society (ATS).15 According to the ATS criteria, individual spirograms
were acceptable if exhalation time was satisfactory (e.g.
* the facility to generate real-time spirograms
, in order to enhance feedback and subject compliance
and flow-volume loops were checked for quality by an experienced technician from the University Hospital Leuven.
subsequently may be unobtainable.
Forced expiratory spirograms
were performed before and after work shifts on the first day back to work after a 2-day rest period.
All study participants had at least three reproducible spirograms
before and after visiting the beach, and the best values from these three spirograms
were used for data analysis (American Thoracic Society 1991).
For the purposes of this study, each participant served as his or her own spirometry control (i.e., preexposure/postexposure); all study participants had at least three reproducible spirograms
before and after visiting the beach.