Carbon monoxide wash-in method to determine gas transfer in vascular beds: application to rat hindlimb

Author:

Cho Carolyn S. L.1,McLean Allan J.1234,Rivory Laurent P.5,Gatenby Paul A.124,Hardman David T. A.6,Le Couteur David G.12354

Affiliation:

1. Canberra Clinical School and Departments of

2. Medicine,

3. Physiology, and

4. John Curtin School of Medical Research, Australian National University, Australian Capital Territory 0200, Australia

5. Pharmacology, University of Sydney, New South Wales 2006;

6. Department of Vascular Surgery, Canberra Hospital, Garran 2605; and

Abstract

The vascular barrier to gas transfer is an important physiological parameter; however, no readily applicable technique exists to quantitate the process. A simple technique to measure the permeability-surface area ( PS) product for gas transfer in vascular beds is proposed using wash in of carbon monoxide (CO) and Crone-Renkin analysis. Wash-in experiments were performed on the perfused hindlimbs of male Wistar rats ( n = 15) by using CO as a surrogate marker for oxygen and technetium-99m-labeled albumin as the vascular marker. The use of CO and erythrocyte-free perfusate and the collection of outflow samples into tubes preloaded with erythrocytes obviated the need for an anaerobic collection device or consideration of Hb binding in the analysis. The PS product for CO was determined from the early extraction as 0.013 ± 0.006 ml · s−1 · g−1. Compartmental analysis revealed that the fractional recovery of CO was 0.45 ± 0.14 and the volume of distribution was 2.31 ± 0.76 ml/g. This technique detected a small measurable barrier to the transfer of CO across the hindlimb vasculature and is potentially applicable to other vascular beds in health and disease.

Publisher

American Physiological Society

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine,Physiology

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