Respiratory gas pressures in the spine: Measurements in goats
| Autor: | Bo Levander, Hakon Kofoed |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
musculoskeletal diseases
Supine position Lumbar vertebrae Mass Spectrometry pCO2 Lumbar Reference Values Respiration Pressure medicine Animals Orthopedics and Sports Medicine Respiratory system Intervertebral Disc Lumbar Vertebrae business.industry Goats Anatomy Carbon Dioxide Hydrogen-Ion Concentration Oxygen Intervertebral disk medicine.anatomical_structure Female Surgery business Cancellous bone |
| Zdroj: | Acta Orthopaedica Scandinavica. 58:415-418 |
| ISSN: | 0001-6470 |
| Popis: | Normal values of pOz, pC02, pH, and intraosseous pressure were measured in situ in the lumbar spine of goats. In the lumbar bodies and discs no difference existed between values found cranially and caudally. pO2 was lower and pCO2 higher in the nucleus pulposus than in the adjacent lumbar bodies. This emphasizes the nutritional route to the disc via the vertebral end plate. Intraosseous pressures in the cranial and caudal levels of the lumbar spine did not differ, and the pressures were the same as otherwise found in cancellous bone. These are the first combined in situ measurements of several basic metabolic parameters in the normal spine using recordings with continuous mass spectrometry. They may constitute a basis for further investigation of metabolism in the structures of the spine. The nucleus pulposus of the lumbar disc is the largest avascular structure in the body (Nachemson 1976), and it may constitute a sink for surrounding metabolic changes. Knowledge of the basic metabolic parameters in the intervertebra1 discs may contribute to the understanding of degenerative spinal disorders. We have developed methods for continuous measurements of p02, pC02, pH, and pressure in the lumbar discs and vertebral bodies in normal goats. relieve the intraabdominal pressure and its effect on respiration in the supine' animal. Via a lateral approach using an image intensifier (Figure l), special bone cannulae (outer diameter 2.0 mm, inner diameter 1.4 mm) were |
| Databáze: | OpenAIRE |
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