Relation between retinal hemorrhages and high arterial pressure / by L. Webster Fox and Warren C. Batroff.

  • Fox, L. Webster (Lawrence Webster), 1853-1931
Date:
[1909?]
Catalogue details

Licence: Public Domain Mark

Credit: Relation between retinal hemorrhages and high arterial pressure / by L. Webster Fox and Warren C. Batroff. Source: Wellcome Collection.

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    COLORADO MEDICINE» LaRARY THE JOURNAL OF THE COLORADO STATE MEDICAL 2s OPVEE OF PLBLICATION 2 MACK BLOCK % S778 x May 1909 Lidger 9 ny In following the reasoning usually given that there is a degeneration of the vessel wall from an accompanying anemia, or as a result of toxic influences, as chem- ical poisons or venoms, introduced into the system, or autogenous metabolic prod- ucts, the result of a faulty body chemistry, we have been led to believe that these are merely predisposing factors, whereas the true or exciting cause of these hemor- rhages in a very large proportion of the cases is a sudden, transient or a persistent, abnormal elevation of the arterial blood pressure. Structures containing end arteries, as the eye, brain or kidney, with their usual delicate capillary endings, are least capa- ble of withstanding this type of a lateral strain imposed upon their walls. An examination of the literature upon the subject shows that attention had been briefly called to this phenomenon as a cause of retinal hemorrhages twenty-five years ago by Mackenzie and Watson, who *Reprint, Ophthalmology, January, 1906. *The Journal, A. M. A., July 18, 1908. *Read by invitation at the thirty-eighth annual meeting of the Colorado State Medical Society, Denver, Colorado, Sept. 8, 9, 10, 1908. studied these cases imperfectly with the sphygmograph; also, more recently, by Dr. -E. W.. Stevens and Dr. Melville Black, of Denver*. That this is an etiologic factor, we be- lieve to be partially established by our researches in this particular field during the past two or three years. The studies of the blood pressure, blood and urine of one hundred cases was decided upon to be investigated with this end in view. The patients examined were those seen within the first forty-eight hours follow- ing the hemorrhage, the larger number, however were observed within twelve hours of the onset. In all cases the blood pressure was estimated with the Stanton modification of the Riva-Rocci sphygmo- manometer with a 9 cm. cuff. The esti- mations were made either in the sitting posture with the arm elevated to the level of the heart, or in the supine position with it bearing the same relation to that organ. The systolic pressure only is recorded, as it represents the greatest pressure the vessels were called upon to withstand. A complete blood count and an analysis of the urine, with particular reference to the presence of albumen, glucose or casts,
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