|
Diagnostic Features |
VCD-PVCM |
ASTHMA |
|
Precipitators (triggers)
|
Exercise, extreme temperatures,
airway irritants, emotional stressors |
Exercise,
extreme temperatures, airway irritants, emotional stressors,
allergens |
| Number of triggers |
Usually one
|
Usually multiple |
| Breathing
obstruction location |
Laryngeal area |
Chest area |
| Timing of
breathing Noises |
Stridor on
inspiration |
Wheezing on exhalation |
| Pattern of dyspneic
event period |
Sudden onset and
relatively rapid cessation |
More gradual onset and longer recovery
|
| Nocturnal
awakeningwith symptoms |
Rarely
|
Almost always |
| Response to broncho- dilators and/or systemic corticosteroids |
No response |
Good response |
| Flow-volume loop |
Inspiratory cut-off,
perhaps some expiratory limb reduction * |
Reduced expiratory limb only
|
| Bronchial
provocation test |
Negative |
Positive |
| Laryngoscopic observartions
|
Inspiratory
adduction of anterior 2/3 of vocal folds; posterior diamond-shaped
chink; perhaps medialization of ventricular folds; inspiratory adduction
may carry over to expiration |
Vocal folds may
ad-duct during exhalation |
| * When patient is symptomatic
|
|
|
| |
|
|
Adapted from the following
journal article:
Barbara A. Mathers-Schmidt. (2001). Paradoxical Vocal Fold
Motion (PVFM):.
A Tutorial on a Complex Disorder and the Speech-Language
Pathologist’s Role.
American Journal of Speech-Language Pathology, Volume 10, issue
2, pages 111-125
|
