Expiratory Only Spirometers are Failing COPD Patients
Alex Stenzler While spirometry has been used to evaluate lung function for more than 200 years, the use of flow volume loops for evaluating the forced vital capacity was only first introduced by Hyatt, Schilder and Fry in 1958.1,2,3 During a forced exhalation, as the pressure in the lung increases, the pleural pressure forces pushing […]