Effects of acute temperature changes on aerial and aquatic gas exchange, pulmonary ventilation and blood gas status in the South American lungfish, Lepidosiren paradoxa

2004 ◽  
Vol 138 (2) ◽  
pp. 133-139 ◽  
Author(s):  
J Amin-Naves ◽  
H Giusti ◽  
M.L Glass
Keyword(s):  
Gas Exchange ◽  
Pulmonary Ventilation ◽  
South American ◽  
Blood Gas ◽  
The South ◽  
Temperature Changes

scholarly journals Effects of aerial hypoxia and temperature on pulmonary breathing pattern and gas exchange in the South American lungfish, Lepidosiren paradoxa

2017 ◽  
Vol 207 ◽  
pp. 107-115 ◽  
Author(s):  
Glauber S.F. da Silva ◽  
Daniela A.D.N. Ventura ◽  
Lucas A. Zena ◽  
Humberto Giusti ◽  
Mogens L. Glass ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Breathing Pattern ◽  
South American ◽  
The South

Respiratory Function in the South American Lungfish, Lepidosiren Paradoxa (Fitz)

1967 ◽  
Vol 46 (2) ◽  
pp. 205-218
Author(s):  
KJELL JOHANSEN ◽  
CLAUDE LENFANT
Keyword(s):  
Gas Exchange ◽  
Venous Blood ◽  
South American ◽  
O2 Uptake ◽  
The South ◽  
Mechanical Agitation ◽  
Air Breathing ◽  
Arterial Blood ◽  
Dissociation Curves ◽  
Branchial Arteries

1. Respiratory properties of blood and pattern of branchial and pulmonary gas exchange have been studied in twelve specimens of the South American lungfish, Lepidosiren paradoxa (Fitz). 2. Haematocrit ranged from 14 to 19% and blood oxygen capacity from 4.9 to 6.8 vol. %. The blood had a high affinity for O2 with a P50 value of 10.5 mm. Hg at Pco2 6 mm. Hg and temperature 23° C. The Bohr effect was low. 3. The CO2 dissociation curves show a steep ascending slope resulting in a relatively high CO2 combining power at physiological values of blood Pco2 The Haldane effect was small. Buffering capacity of oxygenated whole blood was high and exceeded that in typical water breathers. 4. Air breathing was prominent and intervals between air breaths varied from 3 to 10 min. Branchial respiratory movements were extremely shallow and showed a labile frequency. Air breathing was stimulated by hypoxic and hypercarbic water while hyperoxygenated water had no effect. Branchial respiratory rate showed a marked acceleration in response to mechanical agitation of the water. 5. Gas exchange was predominantly carried out by pulmonary breathing. In less than 10 min. the PO2 of expired gas dropped from 150 mm. Hg to less than 30 mm. Hg. The shallow branchial breathing with very low ventilation values resulted in a low O2 uptake via the gills. 6. Blood-gas analysis documented a clear selective passage of blood through the only partially divided heart. A consistently higher PO2 in dorsal aortic than in pulmonary arterial blood indicates a preferential passage of pulmonary venous blood to the anterior branchial arteries giving rise to most of the systemic circulation while systemic venous blood was largely conveyed to the most posterior branchial arteries giving rise to the pulmonary arteries. 7. The oxygen uptake for fish resting in water with access to air averaged 53.4 ml./hr./kg. Exposure to air lowered the O2 uptake markedly. 8. The increased importance of pulmonary breathing in Lepidosiren is discussed in relation to the transition from water breathing to air breathing.

scholarly journals Acute effects of temperature and hypercarbia on cutaneous and branchial gas exchange in the South American lungfish, Lepidosiren paradoxa

2017 ◽  
Vol 63 ◽  
pp. 112-118 ◽  
Author(s):  
Lucas A. Zena ◽  
Kênia C. Bícego ◽  
Glauber S.F. da Silva ◽  
Humberto Giusti ◽  
Mogens L. Glass ◽  
...  
Keyword(s):  
Gas Exchange ◽  
South American ◽  
Acute Effects ◽  
The South ◽  
Effects Of Temperature

scholarly journals Change in lung function early after endoscopic bronchial valve placement in patients with chronic cavitary tuberculosis

2018 ◽  
Vol 28 (3) ◽  
pp. 332-340 ◽  
Author(s):  
L. A. Popova ◽  
Е. A. Shergina ◽  
О. V. Lovacheva ◽  
I. Yu. Shabalina ◽  
T. R. Bagdasaryan ◽  
...  
Keyword(s):  
Lung Function ◽  
Gas Exchange ◽  
Pulmonary Tuberculosis ◽  
Pulmonary Ventilation ◽  
Functional Improvement ◽  
Normal Lung ◽  
Bronchial Obstruction ◽  
Blood Gas ◽  
Gas Exchange Parameters ◽  
Normal Lung Function

The goal of this study was to analyze qualitative and quantitative changes in pulmonary ventilation and gas exchange early after endobronchial valve (EBV) placement intended to induce artificial local collapsed lung in patients with cavitary pulmonary tuberculosis. Methods. The study involved 74 patients with cavitary pulmonary tuberculosis underwent EBV placement to achieve cavity closure. As a result of EBV placement, one to two lung segments were blocked in 25 patients, three lung segments were blocked in 37 patients, and four to five lung segments were blocked in 12 patients. Pulmonary function and blood gases were measured in all patients before and 4 to 6 weeks after placing EVB. Results. Pulmonary ventilation and gas exchange parameters changed early after EBV placement in > 50% of patients. FVC and blood gas parameters changed more often than spirometry parameters. Functional improvement was considered in cases of blood gas improvement and, less frequently, in cases of VC improvement. Functional worsening was considered in cases in lung function decrease and development of mixed (coexisting obstructive and restrictive) abnormalities. Conclusion. In patients with cavitary pulmonary tuberculosis, EBV placement caused functional worsening more likely in patients with normal lung function at baseline. Functional worsening after EBV placement was 3- to 10-fold less likely in those with pulmonary ventilation abnormalities, such as VC decrease or bronchial obstruction, at baseline. Functional improvement after EBV placement was more often seen in moderately decreased lung functional parameters at baseline but not in patients with normal lung function.

Relationship between cerebro-spinal fluid pH and pulmonary ventilation of the South American lungfish,Lepidosiren paradoxa (Fitz.)

2001 ◽  
Vol 290 (4) ◽  
pp. 421-425 ◽  
Author(s):  
Adriana Paula Sanchez ◽  
Anette Hoffmann ◽  
Francisco Tadeu Rantin ◽  
Mogens Lesner Glass
Keyword(s):  
Pulmonary Ventilation ◽  
Spinal Fluid ◽  
South American ◽  
The South
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