By I. Leusen, J. Weyne (auth.), Professor Dr. Marianne E. Schläfke, Dr. Wolf R. See M.A., Professor Dr. Hans-Peter Koepchen (eds.)

This quantity includes the papers provided on the symposion on imperative Neurone setting and the regulate platforms of respiring and move held at Bochum, October 5-7,1981 in honour of Prof. Dr. Dr. h.c. Hans H. Loeschcke, who retired in March 1981. His discovery of ventral medullary substrates forming an important force for the ventilatory in addition to for circulatory keep an eye on platforms, and the elaboration of this idea over the past 25 years have profoundly encouraged the suggestions during this box. In an age of continuing specializa­ tion on partial mechanisms, his method has regularly emphasised the integrative elements of the keep an eye on structures, particularly the function of the breathing keep watch over procedure for the ionic homeostasis of the mind and the shut interrelation among neuronal breathing and cardiovascular keep watch over. This normal goal implies the combo of physico­ chemical and neurophysiological techniques in addition to the research of peripheral functionality of breathing and circulate, themes that are frequently dealt with individually in accordance with different methods.

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Extra info for Central Neurone Environment and the Control Systems of Breathing and Circulation

Sample text

S 0 .... " :>0.. ;::s 0 .... 6 3 [HC0 1 Effect of the Anion Blocker "SITS" 27 similar in both groups, while the rise in cisternal CSF [HCO:,] was significantly higher in SITS treated animals; such differences in CSF [HCO']], which were noted in the latter period of the experiment, were not due to differences in CSF pe02 or lactate concentrations which rose similarly in both groups. There were no significant changes in cisternal CSF [Na +] with time in either group and decrements in CSF [Cr] accounted for the sum of the increments in CSF HCOj and lactate concentrations.

The most important observation from the in vitro studies is that the pattern of the pH response in SITS treated brain slices approached that in mock CSF. The question arises whether or not the diminution of the time constant of the pH change is an indicator of the inhibition of the HC0"3 -cr exchange mechanism. In case of a complete block of the HC0"3 -cr exchange by stilbene derivatives, both intra- and extracellular compartments would be equilibrated separately in respiratory acidosis. The equilibration of the brain ECF phase would need less CO 2 uptake because of the negligible protein buffer concentration in vivo.

For complete understanding further studies are necessary. Summarizing the results of the experiments in vitro we can conclude that after a respiratory CO 2 change the plasma pH reaches 90% of the total change within 5 s, a stepwise increase in p02 yields a change of the H+ ion concentration with a T90 of about 13 s. The transit time of the blood from the lung to the peripheral chemoreceptors or to the central nervous system is about 12 s (Grodins et al. 1967). So we can assume that under resting conditions blood has approximately reached its thermodynamic equilibrium when it passes these structures, even if no carbonic anhydrase is available in the lung.

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