Albany Medical Annals 1917 Vol 38 PDF Download

Excerpt from Albany Medical Annals, Vol. 40: Journal of the Alumni Association of the Albany Medical College; February, 1919 Such an increase may result from (1) an increased output per beat, and (2) an increase in the number of beats, or, (3) both. Either of these would tend to give an increase in the blood pres sure which could embarrass a heart already under strain and lead to an earlier failure. The dilatation of the vessels in response to cerebral stimulation of the vaso-dilator nerves counterbalances this. This interplay in the optimum type occurs so smoothly that no evidence is given of it. The continued decrease in oxygen leads at length to severe embarrassment of the heart muscle with dilatation and death if not relieved. It is probable that the interplay of the vaso-motor system is first affected by arterio-sclerosis and staleness. High blood pres sure occurs in both. As there is evidence that some vessel changes are present as early as thirty it is readily appreciated that youth is essential in aviation. In a series of cases the early twenties showed the largest number of Optimum types. During the rebreathing test sinus arrhythmia is frequently accentuated but has not appeared to alter the run in any degree. Extra systoles when previously present increase during the latter part of the run to great frequency, often occuring every third or fourth beat. Many functional murmurs disappear during the run while organic murmurs increase in intensity. The summary of the response of the different organs deter mines the classification oi that man; which classification is as follows. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.