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A term coined by Dr. Gerald Gause of the University of Florida College of Pharmacy, Thoracic Independent Volume is the volume of the thoracic cavity without the lungs. Another way of looking at it is TIV is the volume at which the thoracic cavity's elastic forces are at equilibrium independent of the lung's inward elastic forces.

This volume is approximately 70% of Total Lung Capacity, or 4060 mL in a typical healthy male of 70 kg. At any volume lower than TIV, the thoracic cavity wants to expand. At any volume higher, it wants to contract.

When taking into account the inward elastic forces of the lungs; above TIV, the forces work congruously (inward recoil of the lung, inward recoil of the thoracic cavity), below TIV, the forces work opposite (inward recoil of the lung, outward recoil of the thoracic cavity).

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .