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In a prospective, observational study the investigators compared resistance values measured using the airway perturbation device (APD) to impulse oscillometry and spirometry. The investigators also created reference equations for normal APD resistance ranges using the data from clinically normal volunteers.
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Airflow pertubation device | Diagnostic Test | Participants have airway resistance measured at the mouth by tidal breathing into a mouth-piece connected to the airflow perturbation device. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Number of participants with APD correlation > 0.5 with spirometry | Respiratory resistance ( cm H20/L/s) measured with APD correlated with volumes (in liters) measured by spirometry. | At enrollment |
| Measure | Description | Time Frame |
|---|---|---|
| Number of participants with APD correlation > 0.5 with impulse oscillometry | Respiratory resistance (cm H20/L/s) measured with APD correlated with resistance (cm H20/L/s) measured using impulse oscillometry | At enrollment |
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Inclusion Criteria:
Exclusion Criteria:
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Patients referred to the Walter Reed NNMC pulmonary clinic mixed with clinically normal volunteers.
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| ID | Term |
|---|---|
| D000402 | Airway Obstruction |
| ID | Term |
|---|---|
| D012131 | Respiratory Insufficiency |
| D012120 | Respiration Disorders |
| D012140 | Respiratory Tract Diseases |
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