scholarly journals Retraction: Mechanisms Contributing to the Generation of Mayer Waves

2021 ◽  
Vol 15 ◽  
Author(s):  
Frontiers Editorial Office
Keyword(s):  
Mayer Waves

Bifurcation in a Simple Model of the Cardiovascular System

2000 ◽  
Vol 39 (02) ◽  
pp. 118-121 ◽  
Author(s):  
S. Akselrod ◽  
S. Eyal
Keyword(s):  
Nonlinear Dynamics ◽  
Blood Pressure ◽  
Heart Rate ◽  
Fixed Point ◽  
Cardiovascular System ◽  
Modified Model ◽  
Mayer Waves ◽  
Sustained Oscillations ◽  
Human Cardiovascular System ◽  
Physiological Values

Abstract:A simple nonlinear beat-to-beat model of the human cardiovascular system has been studied. The model, introduced by DeBoer et al. was a simplified linearized version. We present a modified model which allows to investigate the nonlinear dynamics of the cardiovascular system. We found that an increase in the -sympathetic gain, via a Hopf bifurcation, leads to sustained oscillations both in heart rate and blood pressure variables at about 0.1 Hz (Mayer waves). Similar oscillations were observed when increasing the -sympathetic gain or decreasing the vagal gain. Further changes of the gains, even beyond reasonable physiological values, did not reveal another bifurcation. The dynamics observed were thus either fixed point or limit cycle. Introducing respiration into the model showed entrainment between the respiration frequency and the Mayer waves.

scholarly journals Spinal genesis of Mayer waves

2020 ◽  
Vol 15 (10) ◽  
pp. 1821 ◽  
Author(s):  
MichaelGeorge Zaki Ghali ◽  
GeorgeZaki Ghali ◽  
EmilZaki Ghali
Keyword(s):  
Mayer Waves

Mayer Waves in Dogs with Total Artificial Heart

1992 ◽  
Vol 15 (10) ◽  
pp. 601-605 ◽  
Author(s):  
T. Yambe ◽  
S. Nitta ◽  
Y. Katahira ◽  
T. Sonobe ◽  
S. Naganuma ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Maximum Entropy Method ◽  
Power Spectral Analysis ◽  
Entropy Method ◽  
Total Artificial Heart ◽  
Ventricular Assist Devices ◽  
Ventricular Assist ◽  
Mayer Waves ◽  
System A ◽  
Power Spectral

To assess the effect of a total artificial heart (TAH) on the autonomic nervous system a power spectral analysis of the hemodynamics in a TAH animal was done by the maximum entropy method. Two pneumatically driven sac-type ventricular assist devices were implanted as total biventricular bypass (BVB) in adult mongrel dogs to compare the differences between natural heart and TAH. Once the BVB was pumping, the natural heart was electrically fibrillated to constitute the BVB-type TAH model. In the arterial pressure waveform in animals with TAH, respiratory waves were not changed (97.7±24.6%) though Mayer waves were significantly decreased (47.5 ± 22.6%) compared with the animal with a natural heart. These results suggest that prosthetic hemodynamics in the TAH animal affect fluctuations in the cardiovascular system.

A model for the genesis of arterial pressure Mayer waves from heart rate and sympathetic activity

2001 ◽  
Vol 91 (1-2) ◽  
pp. 62-75 ◽  
Author(s):  
Christopher W Myers ◽  
Michael A Cohen ◽  
Dwain L Eckberg ◽  
J.Andrew Taylor
Keyword(s):  
Heart Rate ◽  
Arterial Pressure ◽  
Sympathetic Activity ◽  
Mayer Waves

Modeling of Mayer waves generation mechanisms

2001 ◽  
Vol 20 (2) ◽  
pp. 92-100 ◽  
Author(s):  
S.R. Seydnejad ◽  
R.I. Kitney
Keyword(s):  
Mayer Waves ◽  
Generation Mechanisms

scholarly journals P-200 Frequency shift of mayer waves to lower frequencies can be explained by delayed sympathetic action of baroreflex control

EP Europace ◽  
2003 ◽  
Vol 4 (Supplement_2) ◽  
pp. B113-B113
Author(s):  
J. Simek ◽  
D. Wichterle ◽  
J. Kofranek ◽  
S. Svacina
Keyword(s):  
Frequency Shift ◽  
Baroreflex Control ◽  
Mayer Waves ◽  
Lower Frequencies

Norepinephrine reuptake, baroreflex dynamics, and arterial pressure variability in rats

2000 ◽  
Vol 279 (4) ◽  
pp. R1257-R1267 ◽  
Author(s):  
Delphine Bertram ◽  
Christian Barrès ◽  
Yong Cheng ◽  
Claude Julien
Keyword(s):  
Time Delay ◽  
Transfer Function ◽  
Fixed Time ◽  
Baroreceptor Reflex ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Mayer Waves ◽  
Frequency Responses ◽  
Low Pass ◽  
Norepinephrine Reuptake

This study examined the effect of norepinephrine reuptake blockade with desipramine (DMI) on the spontaneous variability of the simultaneously recorded arterial pressure (AP) and renal sympathetic nerve activity (SNA) in conscious rats. Acute DMI administration (2 mg/kg iv) depressed AP Mayer waves (∼0.4 Hz) and increased low-frequency (<0.2 Hz) components of AP variability. DMI decreased renal SNA variability, especially due to the abolition of oscillations related to Mayer waves. To examine whether DMI-induced changes in AP and renal SNA variabilities could be explained by alterations in the dynamic characteristics of the baroreceptor reflex loop, the frequency responses of mean AP to aortic depressor nerve stimulation were studied in urethan-anesthetized rats. DMI accentuated the low-pass filter properties of the transfer function without significantly altering the fixed time delay. The frequency responses of iliac vascular conductance to stimulation of the lumbar sympathetic chain were studied in an additional group of anesthetized rats. DMI did not markedly alter the low-pass filter properties of the transfer function and slightly increased the fixed time delay. These results suggest that the DMI-induced decrease in the dynamic gain of the baroreceptor reflex is responsible for the decreased spontaneous renal SNA variability and the accompanying increased AP variability. The “slowing down” of baroreflex responses cannot be attributed to an effect of DMI at the vascular neuroeffector junction.

scholarly journals TRAUBE WAVES AND MAYER WAVES

1919 ◽  
Vol 12 (3) ◽  
pp. 227-229 ◽  
Author(s):  
W. D. Halliburton
Keyword(s):  
Mayer Waves

scholarly journals The vasovagal response of the rat: its relation to the vestibulosympathetic reflex and to Mayer waves

2013 ◽  
Vol 27 (7) ◽  
pp. 2564-2572 ◽  
Author(s):  
Bernard Cohen ◽  
Giorgio P. Martinelli ◽  
Theodore Raphan ◽  
Adam Schaffner ◽  
Yongqing Xiang ◽  
...  
Keyword(s):  
Mayer Waves ◽  
Vestibulosympathetic Reflex ◽  
Vasovagal Response
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