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 Release 21.0, Jan 2008
 
The Medical Algorithms Project
Chapter : ch8. Pulmonary & Acid-Base Section : Spirometry
  Forced Inspiratory Vital Capacity (FIVC) and FIF(25-75%)

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Copyright (c) 2006-2007, Institute for Algorithmic Medicine, Houston, TX, USA. All rights reserved.

Overview :

The forced inspiratory vital capacity (FIVC) consists of:

1) full expiration to residual volume, then

2) rapid maximal inspiratory effort

 

FIF(25-75%) is the rate of airflow over the middle half of the FIVC. This normally exceeds FEF(25-75%). A fall in the FIF(25-75%) is a more sensitive indicator of respiratory muscle dysfunction or suboptimal effort than the FEF(25-75%).

 

  References:

Fishman A (editor). Pulmonary Diseases and Disorders, Second Edition. McGraw-Hill Book Company. 1988. page 2484

 

 
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