scholarly journals Synchronization of Wave Flows of Arterial and Venous Blood and Phases of the Cardiac Cycle with the Structure of the Peripheral Pulse Wave in Norm: Part 2

2018 ◽  
Vol 8 (3) ◽  
pp. 177-181
Author(s):  
Alexander Kruglov ◽  
◽  
Valery Utkin ◽  
Alexander Vasilyev ◽  
Andrey Kruglov ◽  
...  
Keyword(s):  
Cardiac Cycle ◽  
Pulse Wave ◽  
Venous Blood ◽  
Peripheral Pulse ◽  
Wave Flows

scholarly journals Synchronization of Wave Flows of Arterial and Venous Blood and Phases of the Cardiac Cycle: Part 3

2018 ◽  
Vol 8 (4) ◽  
pp. 288-291
Author(s):  
Alexander Kruglov ◽  
Valery Utkin ◽  
Alexander Vasilyev ◽  
Andrey Kruglov
Keyword(s):  
Cardiac Cycle ◽  
Venous Blood ◽  
Wave Flows

scholarly journals Synchronization of Wave Flows of Arterial and Venous Blood and Phases of the Cardiac Cycle: Part 4

2019 ◽  
Vol 9 (2) ◽  
pp. 106-110
Author(s):  
Alexander Kruglov ◽  
Valery Utkin ◽  
Alexander Vasilyev ◽  
Andrey Kruglov
Keyword(s):  
Cardiac Cycle ◽  
Venous Blood ◽  
Wave Flows

scholarly journals Synchronization of Wave Flows of Arterial and Venous Blood with Phases of the Cardiac Cycle in Norm: Part 1

2018 ◽  
Vol 8 (2) ◽  
pp. 123-128
Author(s):  
Alexander Kruglov ◽  
Valery Utkin ◽  
Alexander Vasilyev
Keyword(s):  
Cardiac Cycle ◽  
Venous Blood ◽  
Wave Flows

MR Measurement of Pulse Wave Velocity in the Spinal Canal

2008 ◽  
Author(s):  
Bryn A. Martin ◽  
Francis Loth ◽  
Wojciech Kalata ◽  
John N. Oshinski
Keyword(s):  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Velocity Gradient ◽  
Cardiac Cycle ◽  
Pulse Wave ◽  
Sagittal Plane ◽  
Maximum Velocity ◽  
Time Shift ◽  
Time Interval ◽  
Velocity Measurements

Non-invasive measurement of pulse wave velocity (PWV) in the cerebrospinal fluid (CSF) system is of interest as a potential indicator of subarachnoid space pressure and compliance, both of which play a role in the development of craniospinal diseases. However, measurement of PWV has eluded researchers primarily due to either a lack of access to CSF velocity measurements or to poor temporal resolution. Here, we present PWV measurements using a novel MR technique that acquires unsteady velocity measurements during the cardiac cycle with a time interval <10 ms. Axial CSF velocity measurements were obtained in the sagittal plane of the cervical spinal region on three patients without cranio-spinal disorders. PWV was estimated by using the time shift identified by the maximum temporal velocity gradient during the cardiac cycle. Based on the maximum velocity gradient, the mean PWV in the three cases was calculated to be 4.6 m/s (stdev 1.7 m/s, p<0.005) during systolic acceleration. The measurements of PWV agree with previously published values.

Noninvasive intracranial compliance and pressure based on dynamic magnetic resonance imaging of blood flow and cerebrospinal fluid flow: review of principles, implementation, and other noninvasive approaches

2003 ◽  
Vol 14 (4) ◽  
pp. 1-8 ◽  
Author(s):  
Patricia B. Raksin ◽  
Noam Alperin ◽  
Anusha Sivaramakrishnan ◽  
Sushma Surapaneni ◽  
Terry Lichtor
Keyword(s):  
Magnetic Resonance Imaging ◽  
Cerebrospinal Fluid ◽  
Magnetic Resonance ◽  
Cardiac Cycle ◽  
Venous Blood ◽  
Pressure Probe ◽  
Intracranial Volume ◽  
Resonance Imaging ◽  
Intracranial Compliance ◽  
Arterial Blood

Current techniques for intracranial pressure (ICP) measurement are invasive. All require a surgical procedure for placement of a pressure probe in the central nervous system and, as such, are associated with risk and morbidity. These considerations have driven investigators to develop noninvasive techniques for pressure estimation. A recently developed magnetic resonance (MR) imaging–based method to measure intracranial compliance and pressure is described. In this method the small changes in intracranial volume and ICP that occur naturally with each cardiac cycle are considered. The pressure change during the cardiac cycle is derived from the cerebrospinal fluid (CSF) pressure gradient waveform calculated from the CSF velocities. The intracranial volume change is determined by the instantaneous differences between arterial blood inflow, venous blood outflow, and CSF volumetric flow rates into and out of the cranial vault. Elastance (the inverse of compliance) is derived from the ratio of the measured pressure and volume changes. A mean ICP value is then derived based on a linear relationship that exists between intracranial elastance and ICP. The method has been validated in baboons, flow phantoms, and computer simulations. To date studies in humans demonstrate good measurement reproducibility and reliability. Several other noninvasive approaches for ICP measurement, mostly nonimaging based, are also reviewed. Magnetic resonance imaging–based ICP measurement may prove valuable in the diagnosis and serial evaluation of patients with a variety of disorders associated with alterations in ICP.

scholarly journals Hyperemia-Related Changes in Arterial Stiffness: Comparison between Pulse Wave Velocity and Stiffness Index in the Vascular Reactivity Assessment

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Juan Torrado ◽  
Daniel Bia ◽  
Yanina Zócalo ◽  
Ignacio Farro ◽  
Federico Farro ◽  
...  
Keyword(s):  
Arterial Stiffness ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Healthy Subjects ◽  
Vascular Reactivity ◽  
Pulse Wave ◽  
Stiffness Index ◽  
Experimental Session ◽  
Temporal Course ◽  
Peripheral Pulse

Carotid-to-radial pulse wave velocity (PWVcr) has been proposed to evaluate endothelial function. However, the measurement ofPWVcris not without limitations. A new simple approach could have wide application.Stiffness index(SI) is obtained by analysis of the peripheral pulse wave and gives reproducible information about stiffness of large arteries. This study assessed the effects of hyperemia on SI and compared it withPWVcrin 14 healthy subjects. Both were measured at rest and during 8 minutes after ischemia. SI temporal course was determined. At 1 minute, SI andPWVcrdecreased (5.58±0.24to5.34±0.23 m/s,P<0.05;7.8±1.0to7.2±0.9 m/s;P<0.05, resp.). SI was positively related toPWVcrin baseline (r=0.62,P<0.05), at 1 minute (r=0.79,P<0.05), and during the whole experimental session (r=0.52,P<0.05).Conclusion. Hyperemia significantly decreases SI in healthy subjects. SI was related toPWVcrand could be used to facilitate the evaluation of hyperemia-related changes in arterial stiffness.

P73 AORTIC BUT NOT PERIPHERAL PULSE WAVE VELOCITY IS IMPROVED AFTER HEART RATE TARGETED AEROBIC PHYSICAL TRAINING IN METABOLIC SYNDROME SUBJECTS

2018 ◽  
Vol 24 (C) ◽  
pp. 100
Author(s):  
Ieva Slivovskaja ◽  
Jurate Balsyte ◽  
Ligita Ryliskyte ◽  
Jolita Badariene ◽  
Rokas Navickas ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Heart Rate ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Physical Training ◽  
Pulse Wave ◽  
Peripheral Pulse
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