An Objective Method of Pulse Diagnosis

1987 ◽  
Vol 15 (03n04) ◽  
pp. 147-153 ◽  
Author(s):  
Sook Hyang Yoon ◽  
Yoshihisa Koga ◽  
Isao Matsumoto ◽  
Etsutaro Ikezono
Keyword(s):  
Radial Artery ◽  
Medical Diagnosis ◽  
Absolute Pressure ◽  
Objective Method ◽  
Transient Pressure ◽  
Pulse Diagnosis ◽  
Left Wrist ◽  
Pressure Transducers ◽  
The Absolute ◽  
Pressure Changes

One component of Oriental medical diagnosis is pulse diagnosis. To make this method more objective, three pressure transducers were positioned over the radial artery and the absolute pressure of 50,100 and 150 g as applied at three positions to stimulate the classical pulse diagnosis. The transient pressure changes at the three positions were not equal even when the same absoulte pressure was applied. Pressures were compared in superficial and deep locations, right and left wrist. The largest deflection was consdered as excess and the smallest as depletion in twelve meridians.

TGF-initiated vascular interactions between adjacent nephrons in the rat kidney

1990 ◽  
Vol 259 (1) ◽  
pp. F60-F64 ◽  
Author(s):  
O. Kallskog ◽  
D. J. Marsh
Keyword(s):  
Radial Artery ◽  
Rat Kidney ◽  
Ringer Solution ◽  
Systemic Arterial Pressure ◽  
Tubuloglomerular Feedback ◽  
Lumbar Artery ◽  
Single Nephron ◽  
Flow Pressure ◽  
Pressure Changes ◽  
Stop Flow

We sought to determine whether tubuloglomerular feedback (TGF), activated from one nephron, affects other arterioles derived from the same cortical radial artery. Surface nephrons supplied by a single cortical radial artery were identified by injecting Ringer solution containing Fast Green from a narrow-gauge polyethylene catheter inserted via a lumbar artery into a renal artery. Stop-flow pressure was measured in an identified nephron from such a grouping. In one series, increasing end-proximal flow rate from 0 to 50 nl/min of synthetic tubular fluid in one member of an identified pair of nephrons reduced stop-flow pressure by 1.3 +/- 0.2 mmHg in the other member. When the nephrons were derived from different cortical radial arteries, the stop-flow pressure changed -0.2 +/- 0.1 mmHg. In another series, increasing flow in the adjacent nephron from 0 to 50 nl/min decreased stop-flow pressure 3.9 +/- 0.9 mmHg, and increasing flow in the adjacent nephron by the same amount when flow in the first nephron was 50 nl/min decreased stop-flow pressure 3.4 +/- 0.7 mmHg. These results indicate the operation of an interaction among nephrons derived from a common cortical radial artery. Such an interaction could produce a cooperative effect larger than that predicted from measured single-nephron responses when systemic arterial pressure changes.

scholarly journals Atraumatic Left Distal Radial Artery Aneurysm

2019 ◽  
Vol 2019 ◽  
pp. 1-4 ◽  
Author(s):  
Joseph Maalouly ◽  
Dany Aouad ◽  
Elias Saidy ◽  
Antonios Tawk ◽  
Georges Baaklini ◽  
...  
Keyword(s):  
Radial Artery ◽  
Rare Case ◽  
Artery Aneurysm ◽  
Operative Management ◽  
Chief Complaint ◽  
Radiological Imaging ◽  
Left Wrist ◽  
Pulsatile Mass ◽  
Left Radial Artery ◽  
Distal Radial Artery

Distal radial artery aneurysms are an uncommon pathological entity in the field of surgery. Moreover, distal radial artery aneurysms of idiopathic etiology are even rarer. Herein, we present a rare case of idiopathic/atraumatic left radial artery aneurysm. A 73-year-old female patient presented with a chief complaint of a pulsatile mass located on her left wrist. Radiological imaging showed the presence of a distal radial artery aneurysm which was successfully surgically excised with subsequent ligation of the radial artery. Some of the etiologies and operative management of distal radial artery aneurysm in the anatomical snuffbox to what is in accordance with the literature are discussed. Distal radial artery aneurysms are rare. Hence, their misdiagnosis may lead to wrongful management and increase in morbidity. The appropriate management of distal radial aneurysm is almost always surgical.

scholarly journals An Investigation of Surge in a High-Speed Centrifugal Compressor Using Digital PIV

2000 ◽  
Vol 123 (2) ◽  
pp. 418-428 ◽  
Author(s):  
Mark P. Wernet ◽  
Michelle M. Bright ◽  
Gary J. Skoch
Keyword(s):  
Flow Field ◽  
Centrifugal Compressor ◽  
High Speed ◽  
Transient Flow ◽  
Dynamic Pressure ◽  
Rotating Stall ◽  
Transient Pressure ◽  
Pressure Transducers ◽  
Stable Operating ◽  
Particle Imaging

Compressor stall is a catastrophic breakdown of the flow in a compressor, which can lead to a loss of engine power, large pressure transients in the inlet/nacelle, and engine flameout. The implementation of active or passive strategies for controlling rotating stall and surge can significantly extend the stable operating range of a compressor without substantially sacrificing performance. It is crucial to identify the dynamic changes occurring in the flow field prior to rotating stall and surge in order to control these events successfully. Generally, pressure transducer measurements are made to capture the transient response of a compressor prior to rotating stall. In this investigation, Digital Particle Imaging Velocimetry (DPIV) is used in conjunction with dynamic pressure transducers to capture transient velocity and pressure measurements simultaneously in the nonstationary flow field during compressor surge. DPIV is an instantaneous, planar measurement technique that is ideally suited for studying transient flow phenomena in high-speed turbomachinery and has been used previously to map the stable operating point flow field in the diffuser of a high-speed centrifugal compressor. Through the acquisition of both DPIV images and transient pressure data, the time evolution of the unsteady flow during surge is revealed.

Transient pressure changes in Donnan systems displaced from equilibrium

Nature ◽  
1977 ◽  
Vol 267 (5609) ◽  
pp. 362-364 ◽  
Author(s):  
ELISHEVA ZOROF ◽  
ASHER ILANI
Keyword(s):  
Transient Pressure ◽  
Pressure Changes

Does the Brain "Remember" the Absolute Blood Pressure?

Physiology ◽  
1987 ◽  
Vol 2 (1) ◽  
pp. 10-13
Author(s):  
PK Dorward ◽  
PI Korner
Keyword(s):  
Blood Pressure ◽  
Absolute Pressure ◽  
Good Information ◽  
Absolute Level ◽  
Arterial Baroreceptors ◽  
Resting Blood Pressure ◽  
Baroreceptor Reflexes ◽  
Sustained Change ◽  
The Absolute ◽  
The Brain

A sustained change in resting blood pressure causes the threshold of arterial baroreceptors to shift rapidly, within 20-30 s, in the same direction. This greatly enhances the compensation for disturbances that cause small to moderate changes in blood pressure. A corollary of rapid resetting is ambiguity about the absolute level of blood pressure. Arterial baroreceptor reflexes are good at responding to changes in blood pressure, but they do not provide good information about absolute pressure.

Numerical Simulation of Cavitating Flow in Mixed Flow Pump With Closed Type Impeller

2009 ◽  
Author(s):  
Katsutoshi Kobayashi ◽  
Yoshimasa Chiba
Keyword(s):  
Leading Edge ◽  
Suction Side ◽  
Experimental Results ◽  
Absolute Pressure ◽  
Pressure Side ◽  
Blade Surface ◽  
Mixed Flow ◽  
Closed Type ◽  
The Absolute ◽  
Flow Pump

LES (Large Eddy Simulation) with a cavitation model was performed to calculate an unsteady flow for a mixed flow pump with a closed type impeller. First, the comparison between the numerical and experimental results was done to evaluate a computational accuracy. Second, the torque acting on the blade was calculated by simulation to investigate how the cavitation caused the fluctuation of torque. The absolute pressure around the leading edge on the suction side of blade surface had positive impulsive peaks in both the numerical and experimental results. The simulation showed that those peaks were caused by the cavitaion which contracted and vanished around the leading edge. The absolute pressure was predicted by simulation with −10% error. The absolute pressure around the trailing edge on the suction side of blade surface had no impulsive peaks in both the numerical and experimental results, because the absolute pressure was 100 times higher than the saturated vapor pressure. The simulation results showed that the cavitation was generated around the throat, then contracted and finally vanished. The simulated pump had five throats and cavitation behaviors such as contraction and vanishing around five throats were different from each other. For instance, the cavitations around those five throats were not vanished at the same time. When the cavitation was contracted and finally vanished, the absolute pressure on the blade surface was increased. When the cavitation was contracted around the throat located on the pressure side of blade surface, the pressure became high on the pressure side of blade surface. It caused the 1.4 times higher impulsive peak in the torque than the averaged value. On the other hand, when the cavitation was contracted around the throat located on the suction side of blade surface, the pressure became high on the suction side of blade surface. It caused the 0.4 times lower impulsive peak in the torque than the averaged value. The cavitation around the throat caused the large fluctuation in torque acting on the blade.

scholarly journals Effects of Five Daily Activities on Harmonic Analysis of the Radial Pulse

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Pan-Jen Chen ◽  
Han-Kuei Wu ◽  
Po-Chi Hsu ◽  
Lun-Chien Lo ◽  
Hen-Hong Chang ◽  
...  
Keyword(s):  
Radial Artery ◽  
Pulse Signal ◽  
The Body ◽  
Daily Activities ◽  
Radial Pulse ◽  
Pulse Diagnosis ◽  
Before And After ◽  
Pulse Waves ◽  
High Level ◽  
Fast Fourier Analysis

All daily physiological activities have some effects on the body, and traditional Chinese medicine believes that pulse diagnosis can reflect the circulation of qi and blood throughout the body. This study aimed to explore the effects of five physiological activities, namely, sleep, exercise, ingestion, defecation, and shower, on pulse waves of the radial artery. Thirty test subjects were recruited for the study, and a wearable pulse signal measurement device was used for self-measurement of radial artery pulses before and after various physiological activities. All collected data were subjected to fast Fourier analysis, which transformed each wave from its time domain to frequency domain of 10 harmonics to describe the changes in pulse waves. The results were as follows: exercise and sleep had larger but opposite effects on the pulse waves; defecation and sleep relaxed the body and had the same trend of effect on the pulse waves. Both exercise and ingestion require energy to proceed, and both exert a burden on the body, and the pulse waves showed the same trend of changes. In contrast, shower had a little effect on the pulse waves. Preliminary observation in this study showed that relaxation of the body could increase high-level harmonics, whereas stress could increase low-level harmonics. Further studies are warranted to unravel the physiological significance of this finding.

Establishing the Existence of the Active Stomach Point in the Auricle Utilizing Radial Artery Tonometry

2003 ◽  
Vol 31 (02) ◽  
pp. 285-294 ◽  
Author(s):  
Etsutaro Ikezono ◽  
Tetsuo Ikezono ◽  
John Ackerman
Keyword(s):  
Radial Artery ◽  
Pulse Wave ◽  
Diagnostic Technique ◽  
Acupuncture Point ◽  
Styloid Process ◽  
Auricular Acupuncture ◽  
Pressure Transducers ◽  
Cardiovascular Reflex ◽  
Auricular Point ◽  
Body Acupuncture

One component of Oriental medicine diagnosis utilizes the palpation of the radial pulse both for internal medicine and also to help clinicians accurately choose body acupuncture treatment points. In the mid-1980s, an attempt was made to capture diagnostic information with three pressure transducers positioned bilaterally over the radial arteries in such a fashion as to simulate classical Chinese pulse diagnosis (Yoon and Ikezono, 1986 and 1987). The results of this pilot study were subsequently difficult to replicate. In the early 1950s, Paul Nogier in Lyon, France introduced a different pulse diagnostic technique (Nogier, 1976). By touching an acupuncture needle on an active auricular acupuncture point, the radial artery wall over the styloid process changes in tone more prominently than when inactive points on the acuricle are touched. This dermal/cardiovascular reflex of pulse diagnostic technique helps, then to localize salient auricular points to treat regarding a patient's illness. Objective digitalized measurements of the Nogier radial arterial pulse wave were performed by computerized tonometry. This demonstrated that when an active stomach point in the auricle (n = 11) was detected utilizing an imperceptible electric current, the initial upstroke of the pressure wave, the pulse pressure and the peak-to-peak interval of the radial artery pulse wave all increased significantly compared to placebo point electronic detection. Thus, the existence of an active auricular point on the auricle was verified by radial artery tonometry.

scholarly journals True posttraumatic radial artery aneurysm

2013 ◽  
Vol 12 (4) ◽  
pp. 320-323 ◽  
Author(s):  
Sthefano Atique Gabriel ◽  
Marcia Fayad Marcondes de Abreu ◽  
Guilherme Camargo Goncalves de Abreu ◽  
Claudio Roberto Cabrini Simoes ◽  
Antonio Claudio Guedes Chrispim ◽  
...  
Keyword(s):  
High Risk ◽  
Radial Artery ◽  
Traumatic Events ◽  
Artery Aneurysm ◽  
Dog Bite ◽  
Left Wrist ◽  
Aneurysm Treatment

Radial artery aneurysms are rare and mostly secondary to traumatic events (posttraumatic pseudoaneurysms). Radial artery aneurysms should be treated due to the high risk of embolization, thrombosis, and compression of adjacent nerves. The authors describe a case of a 49-year-old patient complaining of a progressively growing tumor in the left wrist after a dog bite. The tumor proved to be a true posttraumatic aneurysm. Treatment consisted of removal of the aneurysm sac and ligation of the radial artery.

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