When the spirometer was Quack Medicine
The beginning of pulmonary function testing can best be dated to 1846 when John Hutchinson invented the spirometer. Although similar devices had been used by previous scientists he turned it into a…
Month August 2013
SVC and the FEV1/FVC Ratio
The Slow Vital Capacity (SVC) maneuver is usually performed as part of lung volume measurements. It is not unusual for the SVC to be larger than the FVC, particularly in patients with airway obstru…