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Chest, Vol 101, 129-132, Copyright © 1992 by American College of Chest Physicians

ARTICLES

Utility of the peak expiratory flow rate in the differentiation of acute dyspnea. Cardiac vs pulmonary origin

RM McNamara and DJ Cionni
Department of Emergency Medicine, Medical College of Pennsylvania, Philadelphia.

This study examined the utility of a peak expiratory flow rate (PEFR) measurement in the differentiation of acute moderate to severe dyspnea secondary to congestive heart failure or chronic lung disease. A PEFR was determined in 41 episodes of acute respiratory distress in 40 patients prior to emergency department therapy. The mean PEFR +/- SD for the congestive heart failure group (n = 18) was 224 +/- 82 L/min, which was significantly higher (p less than 0.001) than that of the chronic lung disease group (n = 23), which had a mean PEFR of 108 +/- 49 L/min. No single cutoff value allowed 100 percent accurate classification, but the results suggest that the PEFR may be a useful adjunctive tool in the differentiation of acute dyspnea of cardiac vs pulmonary origin.


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Copyright © 1992 by the American College of Chest Physicians.