A method for determination of carbon dioxide applicable to blood and tissues

Influence of Yoga on the Autonomic Nervous System

Increased interest in exploring the physiological benefits of yoga in last few decades resulted in plethora of scientific studies involving different physiological measures in healthy volunteers and patients with various disorders. Of these measures, autonomic functions assessment remained prime role because of wider regulation of autonomic nervous system functions over all visceral systems of the body. Through its two limbs (sympathetic and parasympathetic) autonomic nervous system regulates involuntary visceral organs and systems of the body, which is critical in maintaining the homeostasis of all the physiological functions. This homeostasis is altered in various disease conditions most of which resulted because of the increased stress, a product of modern day lifestyle. Yoga is perfect antidote for the stress, effectively tackling the dreaded effects of stress on physiological systems mainly acting through modulating sympathovagal balance to maintain the homeostasis and restoring the health. We will discuss how yoga achieves this balance in various disorders by reviewing the autonomic system, its functions, laboratory assessments and plenty of scientific studies conducted over last few decades in various disorders involving yoga and autonomic functions. Although we have general idea as to how yoga modulates the sympathovagal balance improving clinical condition, we need to have more long-term, in-depth, well-controlled studies not only to understand these complex interactions of yoga and autonomic functions but also to provide scientific credibility to yoga research in world's scientific community. These steps would hopefully enable mankind to lead the disease-free healthy life style effectively to achieve meaningfully the purpose of one's life.

Gleb Anrep, 1891-1955

Gleb (Vassilievitch von) Anrep was descended from a famous Westphalian family with a proud history of high military distinction which can be traced back to the tenth century. Field Marshal von Anrep was leader of the Livonian Order of Knights who built an outpost of Christianity on the shores of the Baltic. General von Anrep came to St Petersburg at the invitation of Peter the Great and founded the Russian branch of the family in the eighteenth century. Professor Vassili (Basil) von Anrep (1854-1925) was the first member of this family to prefer science to arms. He was born in St Petersburg and studied law in the university there for a year, but he soon tired of academic legal arguments and entered the Medical Academy where he was a brilliant student. He spent two years studying pharmacology in Leipzig, where he described the local anaesthetic action of cocaine and recommended its use in medicine four years before its introduction by Roller. He returned to Russia to be professor of pharmacology, first in Kharkov and then in the Medical Academy in St Petersburg. At the invitation of Prince Oldenburgski he founded the Institute of Experimental Medicine and directed it for several years. At the command of the Emperor he then founded a medical institute for women doctors, which was needed because Moslem women refused to be treated by men. His public duties interfered with his researches and eventually he devoted himself entirely to the reform of education. He held high administrative posts in connexion not only with medicine but also with education in general, and nearly succeeded in introducing compulsory education for all Russians. In the first world war he was at the head of the Russian Red Cross. At the outbreak of the revolution he was thrown into prison, but was released after six months and since the family had come from the Baltic he managed to obtain a Latvian passport. He arrived in London in 1919, stayed with his younger son Gleb for a few years and then left for Paris, where he died in 1925.

The CSF HCO3 increase in hypercapnia relationshp to HCO3, glutamate, glutamine and NH3 in brain

To study the role of carbonic anhydrase in the CSF [HCO3] increase in respiratory acidosis and its effect on brain ammonia, anesthetized rats were subjected to hypercapnia (7% CO2) for 2 hours. The animals received periodic intraventricular injections of either 'mock' CSF or 'mock' CSF and acetazolamide for 45 minutes prior and during hypercapnia when: (a) plasma [HCO3-] was allowed to increase normally and (2) plasma [HCO3] increase was prevented by i.v. HC1 infusion, CSF [HCO3] increased 8.5 mM/L after 2 hours of hypercapnia (delta PCO2 40) in the rats with intraventricular 'mock' CSF injections, and only 6 mM/L in the animals with acetazolamide injections. CSF [HCO3-] increased 7 mM/L during hypercapnia and HCl infusion with intraventricular 'mock' CSF injections, but only 2 mM/L with acetazolamide injections. Changes in total brain CO2 (increase) and brain glutamic acid (decrease) in hypercapnia were not affected by intraventricular acetazolamide and i.v. HCl. The increase of brain NH4+ and glutamine in hypercapnia was reduced in these conditions. It is concluded that there are at least two sources for the CSF [HCO3-] increase in hypercapnia; one formed in the CNS and dependent on carbonic anhydrase, and the other derived from plasma [HCO3-] increase.