The Science Journal of the American Association for Respiratory Care

1999 OPEN FORUM Abstracts

DIAGNOSTIC VALUE OF FLOW-VOLUME LOOP DURING SPIROMETRY

Deepak Shrivastava, M,D., F.C.C.P., Rene' Fong B.S., R.R.T., Jackie Dufrense, C.R.T., C.P.F.T. Pulmonary Function Laboratory, San Joaquin General Hospital, Stockton, CA

Flow volume Loop provides invaluable information on the lung function characteristics. The understanding of genesis of the flow-volume loop allows uncovering many disorders of inspiratory and expiratory phases of the breathing cycle. In current practice flow-volume loop is obtained as a part of the routine spirometry. Many office spirometers are equipped with this application. When performed in erect and supine positions Flow-volume loop can reveal underlying variable airway obstruction. The authors present one case of symptomatic postural airway obstruction to illustrate this point.

A 46-year-old African American woman presented with dyspnea upon lying down and exertion. The physical examination revealed a mass in the neck consistent with enlarged thyroid. A flow-volume loop obtained in sitting position was normal. However, when the study was repeated in supine position the flattening of the inspiratory limb of the Flow-volume loop became obvious indicating the variable extrathoracic obstruction. The patient underwent total thyroidectomy. Her symptoms resolved postoperatively. Later, a repeat study of Flow-volume loop was normal both in erect and supine positions.

OF-99-191

You are here: RCJournal.com » Past OPEN FORUM Abstracts » 1999 Abstracts » DIAGNOSTIC VALUE OF FLOW-VOLUME LOOP DURING SPIROMETRY