Related Experiment Videos
Alveolar liquid clearance in multiple nonperfused canine lung lobes
J D Grimme1, S M Lane, M B Maron
1Department of Physiology, Northeastern Ohio Universities College of Medicine, Rootstown 44272, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1997
Summary
Isolated canine lung lobes effectively clear alveolar fluid, similar to intact dogs. This nonperfused model allows simultaneous study of multiple interventions, aiding research into lung fluid transport mechanisms.
Area of Science:
- Pulmonary Physiology
- Epithelial Transport
Background:
- Alveolar fluid balance is crucial for lung function.
- Understanding epithelial transport mechanisms is key to treating lung edema.
Purpose of the Study:
- To evaluate alveolar liquid clearance (ALC) in isolated, nonperfused canine lung lobes.
- To assess the viability of canine alveolar epithelium transport mechanisms ex vivo.
- To determine if individual lung lobes have intrinsic differences in transport properties.
Main Methods:
- Isolated canine lung lobes were used to measure ALC over 4 hours.
- Autologous plasma was instilled, and protein concentration changes quantified fluid reabsorption.
- Effects of terbutaline, propranolol, and ouabain on ALC were investigated.
Main Results:
- Baseline ALC was 16.5% ± 0.6%, increasing to 30.2% ± 1.3% after terbutaline.
- Terbutaline-stimulated ALC was reduced by propranolol (20.4% ± 0.8%) and ouabain (3.9% ± 1.4%).
- No significant differences in ALC were observed among lobes or between baseline and terbutaline conditions.
Conclusions:
- Canine alveolar epithelial sodium and water transport mechanisms remain viable ex vivo for up to 4 hours.
- Individual canine lung lobes exhibit similar transport properties.
- This nonperfused model enables simultaneous study of multiple interventions within the same animal, optimizing experimental design.