Tidal expiratory flow patterns in airflow obstruction.

Analysis of expiratory tidal flow patterns as a diagnostic tool in airflow obstruction.

An index obtained from tidal expiration, the ratio of time to peak tidal expiratory flow (tPTEF) to expiratory time (tE), discriminates between groups with and without airflow obstruction in infants and children and correlates with other measurements of airflow obstruction in adults. The aim of this study was to determine whether the diagnosis of airflow obstruction could be made from an analys...

Tidal expired airflow patterns in adults with airway obstruction.

Earlier studies have shown that time and flow indices derived from tidal expiratory flow patterns can be used to distinguish the severity of airway obstruction. This study was designed to address two aspects of tidal expiratory flow patterns: 1) how do expiratory flow patterns differ between subjects with normal and obstructed airways; and 2) can a sensitive index of airway obstruction be deriv...

Toluene diisocyanate-linked ocupational airflow obstruction and peak expiratory flow rate patterns among foam makers

Determinants of expiratory airflow in patients with chronic airways obstruction.

This paper examines the relationship between the intrathoracic and bronchial pressures and the flow time course during forceful expiration in patients with severe chronic airways obstruction and tracheobronchial collapse. After an initial peak flow, the flow rate (V) of forceful expirations usually fitted the patient's maximum expiratory flow volume (MEFV) curve. The great reduction in flow aft...

Peak Expiratory Flow Rate Underestimates Severity of Airflow Obstruction in Acute Asthma

BACKGROUND Several investigators have demonstrated a considerable disagreement between FEV1 and PEFR to assess the severity of airflow obstruction. The purpose of this study was to examine whether the discrepancy between the two measurements affects the assessment in the severity of acute asthma. METHODS Thirty-five consecutive asthma patients measured both FEV1 and PEFR at 0, 1hr, 1, 3, 5, 7...