The Diagnostic Value of Forced Expiratory Time

Precipitous fall of the forced expiratory volume.

Patients attending hospital on account of chronic airways obstruction usually present with breathlessness. Most, at this stage, are found to have a severe reduction of the forced expiratory volume (F.E.V.), but little is known about the nature of the deterioration in ventilatory function in earlier phases of the illness. Two patients are described to show how precipitous this deterioration may ...

Forced Expiratory Time: a Simple Test for Airways Obstruction.

Diabetic Retinopathy-Scott et al. JOUM" haziness of the media in a large proportion of diabetics made it difficult to visualize the capillaries in this study. Although, in Fig. 6 B, an arterial injection of fluorescein has shown up zones of capillary closure alongside arteries and scattered small areas of capillary closure (Ashton, 1953), we have been able to discern this phenomenon in only thr...

Analysis of the forced expiratory maneuver.

Forced expiratory time--its reliability as a lung function test.

Three studies of factors affecting variability of forced expiratory time (FET) have been carried out. In the first, different observers or repeated measurements over a few minutes were shown to make no significant contribution to FET variability. Time of day was also relatively unimportant. In the second study, FET was shown to vary considerably more than peak flow rate, forced expiratory volum...

Uncertainties in the expected value for forced expiratory volume in one second after surgery.

The purpose of this study is to understand better the reasons for the frequent unreliability of the expected value for the forced expiratory volume in one second (FEV1) in predicting surgical results after pneumonectomy. Measurement of FEV1 was performed in 159 patients before and after removal of one lung. Only 41 of the postoperative values for FEV1 differed from predicted values by less than...