Neural control of arterial pressure variability in the neuromuscularly blocked rat

2011 ◽  
Vol 112 (6) ◽  
pp. 2013-2024
Author(s):  
Xiaorui Tang ◽  
Tian Hu
Keyword(s):  
Arterial Pressure ◽  
Neural Control ◽  
Arterial Pressure Variability

Do primary dysfunctions in neural control of arterial pressure contribute to hypertension?

Hypertension ◽  
1991 ◽  
Vol 18 (3_Suppl) ◽  
pp. I38-I38 ◽  
Author(s):  
C. M. Ferrario ◽  
D. B. Averill
Keyword(s):  
Arterial Pressure ◽  
Neural Control

Influences of neural mechanisms on heart period and arterial pressure variabilities in quadriplegic patients

1994 ◽  
Vol 266 (3) ◽  
pp. H1112-H1120 ◽  
Author(s):  
S. Guzzetti ◽  
C. Cogliati ◽  
C. Broggi ◽  
C. Carozzi ◽  
D. Caldiroli ◽  
...  
Keyword(s):  
Arterial Pressure ◽  
Spectral Component ◽  
Systolic Arterial Pressure ◽  
Neural Mechanisms ◽  
Heart Period ◽  
Recording Session ◽  
Sympathetic Modulation ◽  
Arterial Pressure Variability ◽  
Head Up Tilt ◽  
Vasomotor Activity

The heart period (R-R) variability power spectrum presents two components, at low (LF; approximately 0.10 Hz) and high (approximately 0.25 Hz) frequencies, whose reciprocal powers appear to furnish an index of sympathovagal interaction modulating heart rate. In addition, the LF component of the systolic arterial pressure variability spectrum furnishes a marker of sympathetic modulation of vasomotor activity. The contribution of spinal and supraspinal neural circuits to the genesis of these rhythmic oscillatory components remains largely unsettled. Therefore we performed spectral analysis of R-R and systolic arterial pressure variabilities in 15 chronic neurologically complete quadriplegic patients (QP) and in 15 control subjects during resting conditions, controlled respiration, and head-up tilt. At rest, in seven QP the LF component was undetectable in both cardiovascular variability spectra; in two QP this component was present only in R-R variability spectrum, whereas the remaining six showed a significantly reduced LF in both signals. In QP, the LF component, when present, underwent paradoxical changes with respect to controls, decreasing during tilt and increasing during controlled respiration. In five QP in whom the recording session was repeated after 6 mo, a significant increase in LF was observed in both variability spectra. These data confirm the finding that a disconnection of sympathetic outflow from supraspinal centers can cause the disappearance of the LF spectral component. However, LF presence in some QP supports the hypothesis of a spinal rhythmicity likely to be modulated by the afferent sympathetic activity.

Subregions of rostral ventral medulla control arterial pressure and regional hemodynamics

1989 ◽  
Vol 257 (3) ◽  
pp. R635-R640 ◽  
Author(s):  
B. F. Cox ◽  
M. J. Brody
Keyword(s):  
Arterial Pressure ◽  
Tidal Volume ◽  
Vascular Resistance ◽  
Neural Control ◽  
Cardiovascular Response ◽  
Cardiovascular Effects ◽  
Ventrolateral Medulla ◽  
Ventral Medulla ◽  
Ventromedial Medulla ◽  
Regional Hemodynamics

The cardiovascular effects of inactivating rostral ventromedial medulla (RVMM) under conditions of normal (2.5 ml) and reduced (1.5 ml) tidal volume were studied in urethan-anesthetized rats. Bilateral microinjection of lidocaine (200 nl, 4%) reduced mean arterial pressure (MAP), renal, mesenteric, and particularly hindquarter vascular resistance. These effects were not significantly altered by reducing tidal volume. Electrical stimulation of RVMM increased MAP and regional vascular resistances, again with the hindquarter change most prominent. The integrated cardiovascular response to stimulating rostral ventrolateral medulla (RVLM) appears to require integrity of RVMM; however, the converse is not true. Overall, these studies indicate that 1) the potential for RVMM to maintain neurogenic control of arterial pressure is as great as RVLM; 2) RVMM is capable of playing a proportionally greater role in the controlling hindquarter vascular resistance; 3) the integrity of RVMM appears to be important for responses elicited from RVLM; and 4) unlike RVLM, neural control of arterial pressure is sustained by RVMM under conditions of reduced tidal volume. We conclude that RVLM and RVMM are functionally and anatomically distinct subregions of rostral ventral medulla with equivalent capacity to maintain vasomotor tone.

Chaotic characteristics of heart rate and arterial pressure variability signals in 24 hours

2002 ◽  
Author(s):  
S. Cerutti ◽  
G. Baselli ◽  
A. Bianchi ◽  
M.G. Signorini ◽  
F. Lissandrello ◽  
...  
Keyword(s):  
Heart Rate ◽  
Arterial Pressure ◽  
Arterial Pressure Variability

Effect of esmolol on positive-pressure ventilation-induced variations of arterial pressure in anaesthetized humans

2004 ◽  
Vol 107 (3) ◽  
pp. 303-308 ◽  
Author(s):  
Hsien Yong LAI ◽  
Cheryl C. H. YANG ◽  
Ching-Feng CHENG ◽  
Fan Yen HUANG ◽  
Yi LEE ◽  
...  
Keyword(s):  
Arterial Pressure ◽  
Positive Pressure Ventilation ◽  
Linear Regression Analysis ◽  
Systolic Pressure ◽  
Pressure Variation ◽  
Positive Pressure ◽  
Mechanically Ventilated ◽  
Arterial Pressure Variability ◽  
Before And After ◽  
Sympathetic Regulation

Positive-pressure ventilation-induced variations in arterial pressure have been related to cardiac sympathetic activity in animals. However, the effect of β-adrenoceptor blockade on these variations in anaesthetized humans under positive-pressure ventilation has not yet been investigated. In the present study, RAPV (respiratory-related arterial pressure variability) and %SPV (percentile systolic pressure variation) were determined before and after esmolol treatment in ten mechanically ventilated patients. RAPV and %SPV decreased significantly after intravenous esmolol (1 mg/kg of body weight) treatment (maximal decrease of RAPV, 50% and %SPV, 35%). Linear regression analysis of RAPV and %SPV before and after esmolol treatment both revealed high correlation (r=0.93 and 0.91 respectively). The amplitudes of RAPV and %SPV also significantly increased in a graded way with higher tidal volumes. Thus we propose that esmolol suppresses the variations in arterial pressure induced by positive-pressure mechanical ventilation, and we suggest that RAPV and %SPV may be alternative choices for monitoring cardiac sympathetic regulation in anaesthetized patients under positive-pressure ventilation.

Renal Arterial Pressure Variability

2006 ◽  
Vol 940 (1) ◽  
pp. 407-415 ◽  
Author(s):  
B. NAFZ ◽  
P. B. PERSSON
Keyword(s):  
Arterial Pressure ◽  
Arterial Pressure Variability

Low frequency component in systolic arterial pressure variability in patients with persistent atrial fibrillation

2009 ◽  
Vol 151 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Luca Mainardi ◽  
Valentina Corino ◽  
Sebastiano Belletti ◽  
Paolo Terranova ◽  
Federico Lombardi
Keyword(s):  
Atrial Fibrillation ◽  
Arterial Pressure ◽  
Low Frequency ◽  
Systolic Arterial Pressure ◽  
Persistent Atrial Fibrillation ◽  
Frequency Component ◽  
Arterial Pressure Variability

Changes in systolic arterial pressure variability are associated with the decreased aerobic performance of rats subjected to physical exercise in the heat

2017 ◽  
Vol 63 ◽  
pp. 31-40 ◽  
Author(s):  
Flávia C. Müller-Ribeiro ◽  
Samuel P. Wanner ◽  
Weslley H.M. Santos ◽  
Milene R. Malheiros-Lima ◽  
Ivana A.T. Fonseca ◽  
...  
Keyword(s):  
Physical Exercise ◽  
Arterial Pressure ◽  
Systolic Arterial Pressure ◽  
Aerobic Performance ◽  
Arterial Pressure Variability
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