Studies on the Velocity of Blood Flow

Abstract

The clinical aspects of the circulation in myxedema have aroused widespread interest, but knowledge of the pathologic physiology of the blood flow in this condition is meagre. The present study undertakes the correlation of the clinical manifestations of myxedema with changes in the velocity of blood flow, basal metabolic rate, pulse rate, plasma volume, venous and arterial pressures, respiratory minute volume and vital capacity of the lungs. The same methods were employed as in the preceding study of thyrotoxicosis (1). RESULTSSixteen series of measurements were made in seven consecutive patients with the classical clinical manifestations of spontaneously occurring myxedema (table 1). In each patient measurements made when the basal metabolic rate was low were compared with subsequent measurements when the basal metabolic rate had been elevated to normal by appropriate doses of desiccated thyroid gland by mouth. The clinical findings in the patients are summanrized in the appended abstracts. All subjects were women between the ages of 45 and 58 years, except subject E. Sa. who was 18 years old. The tendency of myxedema to occur predominantly in women is well recognized.Blood. "Secondary" anemia was observed on examination of the '

Application of the (G′/G)-expansion method to nonlinear blood flow in large vessels

“…Furthermore, the discussed solutions also suggest that the appropriate shape of the blood pressure wave should be combined with a characteristic velocity. This was mainly revealed by the study of Blumgart et al [31], who showed that the velocity of blood from the harm to the heart gradually decreases due to spontaneous fluctuations in the arm. We therefore qualitatively observed from figures 1(a) and 2(a) that the pulse-like wave is faster than the kink-pulse solution.…”

Studies on the Velocity of Blood Flow

“…The variations may well be due to small differences in the basal metabolic rate, some investigators having found normal values, others an increase (15). Previous studies have indeed shown that the pulmonary circulation time may be affected by the metabolic rate (6,7).…”

Modulated pressure waves in large elastic tubes

“…Therefore, the mathematical modelling of such elastic tubes and the waves flowing inside has been of interest during the past years. [1][2][3][4] In that respect, from the pioneering works of Yomosa and Hashimuze, 5,6 many models have been proposed, all of them showing that blood pressure waves are nothing different from solitons. For example, works by Demiray 7,8 on blood flow, in prestressed thin elastic tubes, led to modified and complex variables KdV equations.…”