Topographic distribution of pulmonary ventilation and perfusion in the horse.

T. C. Amis, John Pascoe, W. Hornof

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The regional distribution of ventilation to perfusion ratios (VA/Q) in the lungs of 8 healthy standing Thoroughbred geldings (4.4 +/- 1.5 years, 465.7 +/- 46.6 kg) was studied, using steady-state inhalation and IV infusion of the radioactive gas krypton-81m. The VA/Q was uniformly distributed within a vertical lung strip centered over the 9th rib on the right side. Ventilation per unit of alveolar volume (V/VA) assessed from the clearance of inhaled radioactive gas in 5 horses increased from 0.49 +/- 0.13 (arbitrary units) in nondependent lung zones to 1.45 +/- 0.16 in dependent lung zones. Seemingly, a vertical gradient of pulmonary ventilation exists in the horse that is matched by a similar gradient of perfusion.

Original languageEnglish (US)
Pages (from-to)1597-1601
Number of pages5
JournalAmerican Journal of Veterinary Research
Issue number8
StatePublished - Aug 1 1984
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)


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