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during which the circulation was kept on going amounted to about eighteen minutes. viagra rx price The cheap viagra etc longest period (one dog) lasted thirty-one minutes. In this dog the manipulations were carried on with great energy, cheap viagra etc and at the autopsy it was found that the liver was ruptured. The efficiency of the pulmotor, which was loaned to cheap viagra etc us by the Bureau of Mines, I have investigated on a large number of dogs and the results deserve a more extensive statement. The viagra rx price pulmotor was ap- plied by means of a mask fitted specifically for each dog; the tongue was kept withdrawn. In some in- stances the trachea was connected with a manometer to establish the pressures during inspiration and ex- piration. In some instances the thorax was split transversely and the condition of the lungs and viagra rx price the heart was established by ocular observation. The external part of the pulmotor consists of an in- genious mechanism which provides automatically for inspiration and expiration. The apparatus is driven by the force of a specifically adopted oxygen tank. However, according to Haldane and Hender- son's analysis of the air-oxygen mixture delivered by it, it showed only 26.75 per cent, cheap viagra etc oxygen. 5 The experimental results were strikingly disappointing. In my experiments out of a large number of dogs the circulation of only one could be maintained for one hour. The balance of the experimental animals died sooner or later. In these animals the circula- tion stopped when they were left exclusively to the effects of the pulmotor. The manometer connected with the trachea showed, as a rule, a comparatively small pressure, the utmost 40 millimeters of water. When the thorax was kept open it was observed that practically without exception cheap viagra etc with the continuation of the use of the pulmotor the size of the lungs be- came gradually smaller and smaller. This could also be observed in young animals with normal thorax. When the pulmotor had been used for some time, the lungs, in many cases, presented an uneven appear- ance — small collapsed areas alternating with emphy- sematous ones. It seems that in general our ex- perience agreed with the experience of cheap viagra etc Matas when he used an apparatus with separate chambers for inflation and suction. The success with the pul- motor was more satisfactory when it was connected directly with the trachea by means of a tracheotomy tube. The inefficiency of the pulmotor seems to be caused essentially by two elements. The first ele- ment is its automatic arrangement. While the air- oxygen passes from the nasopharynx into the trachea it seems to meet with some sort of obstacle which converts prematurely the inspiratory move- ment into an expiratory one. The result is an in- sufficient exchange of respiratory gases. The sec- ond deleterious element is the suction; an element inherent to other machines on the market. Appar- ently in many cases the suction closes most of the bronchioles before it succeeds in removing deleteri- ous expiratory gases from the alveoli. In these in- stances the air within the dead space is caused to move, which simulates respiratory movements with- out producing an actual exchange of gases. As stated before, my experience in the experiments with the pulmotor (which in one case has been witnessed by Drs. Cannon and Henderson) coincides with that of Matas. In a recent paper cheap viagra etc by Yandell Henderson" he states that he is inclined to doubt "whether an active viagra rx price withdrawal of air with a pump of limited stroke has any very serious objections" and refers to his experiments "with two pumps arranged in a manner similar to the 'lungmotor' and worked quite violently"; he observed "no particular ill-effects of the viagra rx price lungs." Without entering into a discussion of the nature of Henderson's experiments which do not permit a comparison with the activities of the pul- motor and lungmotor, it is sufficient to recall the fact that in the experiments of Henderson the pumps were connected directly with the trachea, a condi- tion which, as mentioned above, increases the value of the pulmotor. III. The Author's Method of Pharyngeal Insuf- flation. — The most reliable method of artificial respiration is, in the author's opinion, the method of intratracheal insufflation introduced about seven years ago by Dr. Auer and the writer. The writer viagra rx price has kept many animals for more than 24 hours con- tinually under ether administered by the method of intratracheal insufflation without causing any in- jury to them. Furthermore, in several cases of poisoned human beings without any respiration, in- tratracheal insufflation was kept up for more than 15 hours until the patients recovered. However, the introduction of the tube into the trachea requires some dexterity and practice, and any of the appar- atus now on the market used for keeping viagra rx price up the MF.DICAI. R1XOKD. [July 7, 1917 intratracheal tor as it is now tailed by some writers, endotracheal) insufflation is usually expensive. It is therefore highly improbable that in most emer- gency cases an apparatus for intratracheal insuffla- tion as well as an expert surgeon who knows how to introduce the tube and how to handle the apparatus will be just at hand. When I was made chairman of the subcommittee of the above-mentioned com- missions to study the problem of artificial respira- tion by means of apparatus I developed the method of pharyngeal insufflation which worked infallibly in hundreds of cases of animals under the influence of curare and ether.'" Later, when I attempted to use such an apparatus on dead human viagra rx price bodies I found that the method had to undergo some changes in order to be adaptable to the human being." Since the last publication I have made some advantageous changes in this apparatus and had several oppor- tunities to test the efficiency of the apparatus in its present form cheap viagra etc on living human beings with com- pletely paralyzed respiration. In the following I