Telemetry of arterial flow in man with a Doppler ultrasonic flowmeter.
Telemetry of arterial flow in various conditions in man with Doppler ultrasonic flowmeter
FLOW MEASUREMENT↗
SEARCH · Engineering Papers
Results for “arterial”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Regional pulmonary arterial-venous shunting caused by gravitational and inertial forces.
Regional pulmonary arterial-venous shunting in dogs exposed to acceleration in different body positions
ACCELERATION STRESSES (PHYSIOLOGY)↗
Observation of arterial blood pressure of the primate AAP-Bio-A-1 Quarterly progress report, 10 Jul. - 9 Oct. 1968
Circuits, components, and implant site evaluations for arterial blood pressure analyses on primates
Meehan, J. P.↗
Transmission characteristics of distension, torsion and axial waves in arteries
Transmission characteristics of distension, torsion, and axial waves in arteries
Moritz, W. E.↗
Computer modeling of the human systemic arterial tree.
Analog computer modeling of human systemic arterial tree, based on lump parameter circuit approximation
Hillestad, R. J.↗
Theoretical analysis of nonlinear phenomena affecting the pressure and flow pulse in arteries
Method of characteristics for determining cardiovascular parameters of flow pressure in arteries
Anliker, M.↗
Computer study of the effects of small nonlinearities in the arterial system
Hybrid computer simulation of small nonlinearities effects in human arterial system, using perturbation techniques
Rideout, V. C.↗
Influence of body position on regional pulmonary arterial-venous shunts in intact dogs
Body position effect on oxygen saturation of regional pulmonary venous blood and arterial- venous shunts in intact dogs
Amorim, D. De. S.↗
Hypotensive effects of chlordiazepoxide, amobarbital and chlorpromazine on behaviorally induced elevated arterial blood pressure in the squirrel monkey
Hypotensive effects of chlordiazepoxide, amobarbital and chlorpromazine on behaviorally induced elevated arterial blood pressure in squirrel monkey
Benson, H.↗
Changes in the arterial pressure of athletes
Arterial pressure characteristics of athletes
Source record↗
Nonlinear analysis of flow pulses and shock waves in arteries. I
Large amplitude wave propagation in arteries, deriving aorta mathematical model consistent with heart pressure and flow pulses and wavefront velocity
Anliker, M.↗
Participation of central noradrenergic neurons in arterial baroreceptor reflexes in the rabbit
Arterial baroreceptor reflex action in rabbits, noting central noradrenergic neuron participation
Chalmers, J. P.↗
Nonlinear analysis of flow pulses and shock waves in arteries. II
Nonlinear analysis of arterial flow pulses and shock waves, simulating aortic insufficiency under pathological conditions by mathematical model
Anliker, M.↗
An electronic circuit that detects left ventricular ejection events by processing the arterial pressure waveform
An electronic circuit for processing arterial blood pressure waveform signals is described. The circuit detects blood pressure as the heart pumps blood through the aortic valve and the pressure distribution caused by aortic valve closure. From these measurements, timing signals for use in measuring the left ventricular ejection time is determined, and signals are provided for computer monitoring of the cardiovascular system. Illustrations are given of the circuit and pressure waveforms.
Gebben, V. D.↗
Liquid breathing - Prevention of pulmonary arterial-venous shunting during acceleration.
Dependent pulmonary atelectasis, arterial-venous shunting, and downward displacement of the heart caused by the gravitational-inertial force environment were prevented in dogs breathing oxygenated liquid fluorocarbon in a whole-body water-immersion respirator. Partial closure of the major airways during part of the expiratory phase of liquid respiration was a significant problem initially but was minimized in subsequent studies.
Sass, D. J.↗
An economical arterial-pulse-wave transducer
Transducer records arterial pulses externally. Device uses thin plastic membrane which is fluid coupled to pressure sensitive transistor. Transistor is connected to amplifier which, in turn, is connected to recorder. End section is threaded to accept suitable holder and contains pressure relief vent allowing transistor to sense only pressure levels greater than atmospheric.
Kim, C.↗
Ultrasonic Doppler measurement of renal artery blood flow
Implantable pulsed Doppler ultrasonic flowmeter development has resulted in designs for application to the aortas of dogs and humans, and to human renal and coronary arteries. A figure of merit was derived for each design, indicating the degree of its precision. An H-array design for transcutaneous observation of blood flow was developed and tested in vitro. Two other simplified designs for the same purpose obviate the need to determine vessel orientation. One of these will be developed in the next time period. Techniques for intraoperative use and for implantation have had mixed success. While satisfactory on large vessels, higher ultrasonic frequencies and alteration of transducer design are required for satisfactory operation of pulsed Doppler flowmeters with small vessels.
Source record↗
An ultrasonic scanning system for arterial imaging
A transcutaneous system for real-time imaging of arteries is described. A transducer probe containing three linear arrays of elements scans tissues within the element Fresnel zones. Each element is multiplexed in turn to a pulsed Doppler processor to permit real-time visualizations of moving targets. Applications of the motion-indicating B-scans are discussed, with special attention to problems in transcutaneous measurement of blood flow.
Hottinger, C. F.↗