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Flow with periodic variations
In fluid dynamics, a flow with periodic variations is known as pulsatile flow, or as Womersley flow. The flow profiles was first derived by John R. Womersley
Pulsatile_flow
Medical device to assist or replace a heart
two main categories – pulsatile pumps, which mimic the natural pulsing action of the heart, and continuous-flow pumps. Pulsatile VADs, such as the HeartMate
Ventricular_assist_device
False perception of sound
pulse, known as pulsatile tinnitus or vascular tinnitus. Pulsatile tinnitus is usually objective in nature, resulting from altered blood flow or increased
Tinnitus
Type of liquid flow within a closed conduit
Abouezzi, Joanna; Ristroph, Leif (17 May 2021). "Early turbulence and pulsatile flows enhance diodicity of Tesla's macrofluidic valve". Nature Communications
Pipe_flow
Valve design
of 2 to 4. It has also been shown that the device works better with pulsatile flows. Coandă effect Check valve Diode Labyrinth seal Static mixer Valve
Tesla_valve
Thickening, hardening and loss of elasticity of the walls of arteries
characteristics of acceleration and visco elasticity of artery wall under pulsatile flow conditions (physical meaning of I * as a parameter of progressive behaviors
Arteriosclerosis
Dimensionless expression of the pulsatile flow frequency in relation to viscous effects
of the pulsatile flow frequency in relation to viscous effects. It is named after John R. Womersley (1907–1958) for his work with blood flow in arteries
Womersley_number
Part of the cardiac cycle
Ventricular Assist Devices (LVAD) and hemodialysis that replace pulsatile flow with continuous blood flow. Examining diastolic function during a cardiac stress
Diastole
Engler; Hong; Miller (May 2001). "Comparison of Flow Measure Techniques during Continuous and Pulsatile Flow". 2001 BE Undergraduate Projects. Department
Dimensionless numbers in fluid mechanics
Dimensionless_numbers_in_fluid_mechanics
British applied mathematician
of Leeds in 1996. Her dissertation, Coronary artery haemodynamics: pulsatile flow in a tube of time-dependent curvature, was supervised by Tim Pedley
Sarah_L._Waters
Medical diagnostic method
by Léandre Pourcelot [1], is a measure of pulsatile blood flow that reflects the resistance to blood flow caused by microvascular bed distal to the site
Arterial_resistivity_index
American medical device manufacturer
adverse events, and greater reliability with continuous-flow LVADs compared to pulsatile-flow devices. As of mid 2015, Thoratec has the only FDA-approved
Thoratec
Ability of a biological organ to distend
wrote this in the "Handbook of Physiology" in 1963 in work entitled "Pulsatile Flow in the Vascular System". So, C=ΔVΔP. Arterial compliance is an index
Compliance_(physiology)
Organelle used in regulating osmosis
in protists, including unicellular algae. It was previously known as pulsatile or pulsating vacuole. The contractile vacuole is a specialized type of
Contractile_vacuole
Dynamics of blood flow
pumping action of the heart. The pumping action of the heart generates pulsatile blood flow, which is conducted into the arteries, across the micro-circulation
Hemodynamics
Medical condition
pressure, general weakened connective tissue or as a result of the pulsatile flow of cerebrospinal fluid on weakened spinal dura. Dural ectasia is common
Dural_ectasia
Dimensionless number describing oscillating flow mechanisms
fluid mechanics Womersley number – Dimensionless expression of the pulsatile flow frequency in relation to viscous effects Weissenberg number – Dimensionless
Strouhal_number
Involuntary non-striated muscle
Windkessel, propagating ventricular contraction and smoothing out the pulsatile flow, and the smooth muscle within the tunica media contributes to this property
Smooth_muscle
Medical condition
by the pulsatile flow of blood through vessels. Nitric oxide produced by EcNOS, maintains the diameter of blood vessels and proper blood flow to tissues
Diabetic_foot_ulcer
German health company
batteries are carried in a shoulder-bag. EXCOR is a paracorporeal, pulsatile flow VAD. The device provides left ventricular, right ventricular or biventricular
Berlin_Heart
Largest artery in the human body
heart and smooth out the pulsatile nature created by the heart. Aortic pressure is highest at the aorta and becomes less pulsatile and lower pressure as
Aorta
Effective diffusion of a substance enhanced by shear flow, studied in fluid dynamics
(2025). Taylor dispersion in variable-density, variable-viscosity pulsatile flows. Prog. Scale Model. Int. J. 7(1) 1-6. Majda, A. J., & Kramer, P. R
Taylor_dispersion
Use of a fluid to perform analog or digital operations
Abouezzi, Joanna; Ristroph, Leif (2021-05-17). "Early turbulence and pulsatile flows enhance diodicity of Tesla's macrofluidic valve". Nature Communications
Fluidics
Organ preservation technique
pressure of 50–80 mm Hg systolic, in a machine that produced a pulsatile perfusate flow. Using this system Belzer had 6 dogs surviving after their kidneys
Machine_perfusion
Christian; John, Thomas (2021-06-29). "Optimizing pressure-driven pulsatile flows in microfluidic devices". Lab on a Chip. 21 (13): 2605–2613. doi:10
Sigma_approximation
Medical condition
chronic pulsatile compressive force from the artery. The narrowed turbulent channel predisposes the patient to thrombosis. The compromised blood flow often
May–Thurner_syndrome
Medical imaging technique of the heart
Kripfgans, J. Rubin, A. Hall and J. Fowlkes, "Mean Volume Flow Estimation in Pulsatile Flow Conditions," Ultrasound in Med. & Biol., vol. 35, pp. 1880-1891
Doppler_echocardiography
CSF Flow MRI overview, methodology, and application
Cerebrospinal fluid (CSF) flow MRI is used to assess pulsatile CSF flow both qualitatively and quantitatively. Time-resolved 2D phase-contrast MRI with
Cerebrospinal_fluid_flow_MRI
Force from blood vessels that affects blood flow
original on 10 August 2011. Retrieved 7 April 2011. Measurement of real pulsatile blood flow using X-ray PIV technique with CO2 microbubbles, Hanwook Park, Eunseop
Vascular_resistance
Part of the human heart
heart is pulsatile, and the venous inflow to the heart is continuous and non-pulsatile. But without functioning atria, venous flow becomes pulsatile, and
Atrium_(heart)
pump for pulsatile flow transport : Part 1: Flow characteristics of the microimpedance pump. Part 2: A systematic study of steady and pulsatile transport
Impedance_pump
State of endothelial cells in blood vessels
endothelial cell apoptosis. However, unlike oscillatory flow, both laminar(steady) and pulsatile flow and shear stress environments are often considered together
Endothelial_activation
American bioengineer and physician
Biological Engineering (AIMBE) Ku DN, Giddens DP, Zarins CK, Glagov S. "Pulsatile flow and atherosclerosis in the human carotid bifurcation. Positive correlation
David_Nelson_Ku
Engineer, inventor, academic and author
suspension effect on peristaltically induced unsteady pulsatile flow in a narrow artery: Blood flow model". Mathematical Biosciences. 283: 91–105. doi:10
Kambiz_Vafai
Ukrainian surgeon (1934–2016)
fixation of the stent graft in human aorta under different conditions of pulsatile flow. Volodos performed the first human implantation of the fabric-covered
Nicolai_L._Volodos
Chart of tissue blood volume changes
out-of-plane motion. In particular, wide-field imaging of pulsatile motion induced by blood flow can be measured on the thumb by digital holography. The
Photoplethysmogram
American biomedical engineer
counterparts. Skala has developed organ-on-a-chip devices to study pulsatile flow and how it impacts cardiovascular disease. She is particularly interested
Melissa_Skala
American physicist
World Scientific, 1991 "Mechanics of Pulsatile Flows of Relevance to Cardiovascular System," in Cardiovascular Flow Dynamics and Measurements, (Eds. N.H
Fazle_Hussain
Medical condition
as pulsatile flow in the umbilical vein, absent or reversed end-diastolic flow in the umbilical artery, increased pulsatility index, or reversed flow in
Twin anemia-polycythemia sequence
Twin_anemia-polycythemia_sequence
Measurement of the area of the heart's aortic valve
PMID 7471364. Agarwal, R. K.; Okpara, E (2010). "Numerical Study of Pulsatile Flow through Models of Vascular and Aortic Valve Stenoses and Assessment
Aortic_valve_area_calculation
Psychrometrics Ptychography Pucadyil Ittoop John Pulsar Pulsar kicks Pulsatile flow Pulse (physics) Pulse forming network Pulse height analyzer Pulsed EPR
Index_of_physics_articles_(P)
Biological process
however after three days the flow becomes pulsatile. Pulsatile flow plays an important role in vascular remodelling, as flow patterns can affect the mechanotransduction
Vascular remodelling in the embryo
Vascular_remodelling_in_the_embryo
Ultrasound imaging of the movement of tissues and body fluids using the Doppler effect
Waveform of the flow can be classified as: pulsatile (as in arteries), phasic (as in veins), non-phasic (as in diseased veins), and aphasic (no flow). Spectral
Doppler_ultrasonography
models can combine the constant supersaturation principle together with pulsatile flow, which is characteristic of the human cardiovascular system. The calcification
In vitro models for calcification
In_vitro_models_for_calcification
Medical condition
of the cord. Doppler examination shows anechoic cystic areas, with pulsatile flow in spectral analysis. Some chorioangiomas may be solid masses, and may
Chorioangioma
Collection of blood between outer artery layers
tunica media. A pseudoaneurysm, being associated with a vessel, can be pulsatile; it may be confused with a true aneurysm or dissecting aneurysm. The most
Pseudoaneurysm
Medical condition
also increase its intensity. It may be loud enough to result in audible pulsatile tinnitus. It is by far the most common type of normal continuous murmur
Venous_hum
Fluid accumulation in the tissue and air spaces of the lungs
hepatomegaly, where the liver is excessively enlarged and may be tender or even pulsatile. Additional symptoms such as fever, low blood pressure, injuries or burns
Pulmonary_edema
Fluid dynamics concept
PMID 16587082. Painter, Page R; Edén, Patrik; Bengtsson, Hans-Uno (2006). "Pulsatile blood flow, shear force, energy dissipation and Murray's Law". Theoretical Biology
Murray's_law
South Korean roboticist (born 1955)
LAB ON A CHIP, 2014.02. “Precise manipulation of a microrobot in the pulsatile flow of human blood vessels using magnetic navigation system”, JOURNAL OF
Jong_Oh_Park
Small arteries in the microcirculation
up and down fluctuation of the arterial blood pressure is due to the pulsatile nature of the cardiac output and determined by the interaction of the
Arteriole
flowmetry MeSH H01.671.799.581 – microfluidics MeSH H01.671.799.775 – pulsatile flow MeSH H01.671.868 – temperature MeSH H01.671.868.272 – cold MeSH H01
List_of_MeSH_codes_(H01)
Study of flow properties of blood and its elements of plasma and cells
the testing of a pulsatile Blood Pumps. Strong correlations between blood viscoelasticity and regional and global cerebral blood flow during cardiopulmonary
Hemorheology
Surgical treatment for aneurysm
(2013-04-01). "An In Vitro Study of Pulsatile Fluid Dynamics in Intracranial Aneurysm Models Treated with Embolic Coils and Flow Diverters". IEEE Transactions
Endovascular_coiling
all-or-nothing activation. Moreover, this all-or-nothing activation was pulsatile, and the frequency of pulses in turn determined whether mammalian cells
Live_single-cell_imaging
Measuring technique
detection and analysis of optical fluctuations. It can be used for pulsatile blood flow imaging. Electronic speckle pattern interferometry Holography Interferometry
Holographic_interferometry
Noise generated by the heart
metre in poetry that follows a similar rhythm to the human heartbeat Pulsatile tinnitus – hearing a heartbeat sound in one or both ears Souffle (heart
Heart_sounds
Gonadotropin secreted by the adenohypophysis
Stamatiades GA, Kaiser UB (March 2018). "Gonadotropin regulation by pulsatile GnRH: Signaling and gene expression". Molecular and Cellular Endocrinology
Luteinizing_hormone
Measurement of blood oxygen saturation
the pulsatile signal is usually displayed for a visual indication of the pulses as well as signal quality, and a numeric ratio between the pulsatile and
Pulse_oximetry
American physician (born 1940)
the first long-term LVAD, the pulsatile HeartMate I in 1986, and the replacement of a diseased heart with a continuous flow device using two HeartMate II
O._H._Frazier
Topics referred to by the same term
propagates through that medium Arterial resistivity index, a measure of pulsatile blood flow Ring Indicator, a signal in the RS232 serial communications standard
RI
Medical condition
common signs/symptoms of DAVFs are: Pulsatile tinnitus Occipital bruit Headache Visual impairment Papilledema Pulsatile tinnitus is the most common symptom
Dural_arteriovenous_fistula
Medical condition
on 2024-04-28. Retrieved 4 June 2016. Ashrafian, Hutan (March 2006). "Pulsatile pseudo-proptosis, aortic regurgitation and 31 eponyms". International
Aortic_regurgitation
Medical condition
within the skull due to high blood flow through the arteriovenous fistula), progressive visual loss, and pulsatile proptosis or progressive bulging of
Carotid-cavernous_fistula
Disease in the valves of the heart
and jugular venous distension. Signs of tricuspid regurgitation include pulsatile liver, prominent V waves and rapid y descents in jugular venous pressure
Valvular_heart_disease
Difference between systolic and diastolic blood pressure
elastin fibers versus smooth muscle and collagen. This serves to dampen the pulsatile ejection fraction of the left ventricle, thereby reducing the initial
Pulse_pressure
Replacement of a valve in the human heart
(January 2012). "Assessment of a novel stentless mitral valve using a pulsatile mitral valve simulator". The Journal of Heart Valve Disease. 21 (1): 71–5
Artificial_heart_valve
Tactile arterial palpation of the heartbeat by fingertips
electrocardiogram (ECG) is required to identify the type of tachycardia. Pulsatile This description of the pulse implies the intrinsic physiology of systole
Pulse
Clear, colorless bodily fluid found in the brain and spinal cord
multidirectionally in the subarachnoid space. The flow of cerebrospinal fluid is pulsatile, driven by the cardiac cycle. The flow of CSF through perivascular spaces
Cerebrospinal_fluid
Increased pressure around the brain with no known cause
The pain may also be experienced in the neck and shoulders. Many have pulsatile tinnitus, a whooshing sensation in one or both ears (64–87%); this sound
Idiopathic intracranial hypertension
Idiopathic_intracranial_hypertension
Medical device
injured myocardium, the circulatory system transitions from a pulsatile mechanism to continuous flow. Cellular response to cardiogenic shock is poorly described
Impella
Human disease
Decreased pupil size with drooping of the upper eyelid (Horner syndrome) Pulsatile tinnitus Ischemic signs and symptoms: Temporary vision loss Ischemic stroke
Carotid_artery_dissection
Mechanical device which replaces the heart
well as only requiring a battery pack to run. The BiVACOR heart is not pulsatile like previous hearts and contains no valves, but is capable of generating
Artificial_heart
Indian American surgeon
He discovered that venous blood flow is pulsatile which, prior to Rai's discovery, was described only as linear flow. He is best known for his discovery
Dinker_Belle_Rai
Localized enlargement of the abdominal aorta
aorta and the duodenum) fistulae. On physical examination, a palpable and pulsatile abdominal mass can be noted. Bruits can be present in case of renal or
Abdominal_aortic_aneurysm
Scientific discipline
can be thought of as a muscular pump, consisting of four chambers, and pulsatile muscles which pump and circulates the blood through the vasculature. Arteries
Biofluid_dynamics
Compression of nerves or blood vessels between the neck and ribcage
development of facial plethora, cyanosis, inspiratory stridor and non-pulsatile elevation of the JVP is indicative of TOS. TOS can be related to cerebrovascular
Thoracic_outlet_syndrome
Medical diagnostic method
addition to static flow-contrast imaging, LDH supports beat-resolved analysis: waveform-processing approaches have been used to isolate pulsatile components,
Laser_Doppler_imaging
Occurs when there is a sudden lack of blood flow to a limb
disruption of blood flow to a limb, which may present with either hard signs or soft signs of vascular injury. Hard signs include pulsatile bleeding, expanding
Acute_limb_ischaemia
Pressure exerted by fluids inside the skull and on the brain
in this instance is a drug. The most frequent symptoms are headaches, pulsatile tinnitus, diplopia, and impairment of visual acuity. The only observable
Intracranial_pressure
Flight suit which controls blood-flow during high acceleration
primary contribution, allowing for the shift from pulsatile water-filled bladders to non-pulsatile air-filled bladders, made by the Mayo investigators
G-suit
Measurement of blood pumped by the heart
S2CID 30752685. Bernstein, Donald P (2010). "Impedance cardiography: Pulsatile blood flow and the biophysical and electrodynamic basis for the stroke volume
Cardiac_output
Noninvasive type of medical imaging
interesting aspect of thoracic EIT is its ability to record and filter pulsatile signals of perfusion. Although promising studies have been published on
Electrical impedance tomography
Electrical_impedance_tomography
Visual impairment
ISS, but at no time reported headaches, transient visual obscurations, pulsatile tinnitus or diplopia (double vision). His postflight fundus examination
Spaceflight associated neuro-ocular syndrome
Spaceflight_associated_neuro-ocular_syndrome
Medical condition
fatigue syndrome, different types of headaches, visual disturbances, pulsatile tinnitus and various neurodegenerative diseases.[non-primary source needed][non-primary
Cranial venous outflow obstruction
Cranial_venous_outflow_obstruction
Approximate power law relating animal metabolic rate to mass
1365-2435.2006.01136.x. Painter PR, Edén P, Bengtsson HU (August 2006). "Pulsatile blood flow, shear force, energy dissipation and Murray's Law". Theoretical Biology
Kleiber's_law
Gonadotropin that regulates the development of reproductive processes
the first half of the follicle phase also exerts a negative feedback on pulsatile luteinizing hormone (LH) secretion amplitude, thus allowing a more favorable
Follicle-stimulating_hormone
Surgery performed on the heart
pulmonary artery. Direct canalization to the right ventricle provides pulsatile blood flow compared to the Blalock-Taussig conduit. The Single Ventricle Reconstruction
Norwood_procedure
Injury caused by a bullet
surgical intervention. Hard signs include active bleeding, expanding or pulsatile hematoma, bruit/thrill, absent distal pulses and signs of extremity ischemia
Gunshot_wound
Theories proposing consciousness as an electromagnetic phenomenon
likened the idea to an orchestra; neurons as “instruments” and pulsatile, ion-charged CSF flow as a “conductor” that helps coordinate rhythms via delicate
Electromagnetic theories of consciousness
Electromagnetic_theories_of_consciousness
Pressure exerted by circulating blood upon the walls of arteries
pressures, Ppulse=Psys−Pdias. The pulse pressure is a consequence of the pulsatile nature of the cardiac output, i.e. the heartbeat. The magnitude of the
Blood_pressure
Medical condition
implicated in "brain freeze" cause the aura (sensory disturbance) and pulsatile (throbbing pain) phases of migraines. It is possible to have a cold-stimulus
Cold-stimulus_headache
Type of valvular heart disease
palpation of the right upper quadrant of the abdomen; the liver may be pulsatile on palpation and even on inspection. The causes of TR may be classified
Tricuspid_regurgitation
Excess of prolactin hormone in the blood
counter-current flow in the hypophyseal pituitary portal system, which triggers the release of hypothalamic dopamine. This process also inhibits the pulsatile secretion
Hyperprolactinaemia
Medical condition
compress the airways during systole with cardiac ejection, resulting in a pulsatile wheeze that corresponds to the heart rate. This is sometimes erroneously
Acute_severe_asthma
Loss of elasticity in blood vessels
Windkessel effect of the arteries. The Windkessel effect buffers the pulsatile ejection of blood from the heart converting it into a more steady, even
Arterial_stiffness
Human arterial disease
Symptoms of craniocervical involvement include headaches (mostly migraine), pulsatile tinnitus, dizziness, and neck pain, although patients are often asymptomatic
Fibromuscular_dysplasia
Medical diagnostic method
five harmonics usually contain 90% of the entire pulsatile energy within the system of pressure/flow oscillations in the peripheral circulation. It could
Transcranial_Doppler
Medical condition
intact. Pulsatile back-bleeding from distal innominate artery stump should be checked to insure collateral circulation. In patients with poor pulsatile back-bleeding
Tracheoinnominate_fistula
Stimulation of ovulation by medication
The gonadotropin-releasing hormone pump is used to release doses in a pulsatile fashion. This hormone is synthesised by the hypothalamus and induces the
Ovulation_induction
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PULSATILE FLOW
PULSATILE FLOW
PULSATILE FLOW
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