scholarly journals Arterial baroreflex sensitivity and blood pressure variabilities before and after carotid surgery

1993 ◽  
Vol 18 (6) ◽  
pp. 1091-1103
Author(s):  
Thomas S. Riles
Keyword(s):  
Blood Pressure ◽  
Baroreflex Sensitivity ◽  
Carotid Surgery ◽  
Arterial Baroreflex ◽  
Before And After ◽  
Arterial Baroreflex Sensitivity

Arterial baroreflex sensitivity and blood pressure variabilities before and after carotid surgery

1991 ◽  
Vol 69 (16) ◽  
pp. 763-768 ◽  
Author(s):  
M. Hirschl ◽  
M. M. Hirschl ◽  
D. Magometschnigg ◽  
B. Liebisch ◽  
O. Wagner ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Baroreflex Sensitivity ◽  
Carotid Surgery ◽  
Arterial Baroreflex ◽  
Before And After ◽  
Arterial Baroreflex Sensitivity

scholarly journals Slow Breathing Improves Arterial Baroreflex Sensitivity and Decreases Blood Pressure in Essential Hypertension

Hypertension ◽  
2005 ◽  
Vol 46 (4) ◽  
pp. 714-718 ◽  
Author(s):  
Chacko N. Joseph ◽  
Cesare Porta ◽  
Gaia Casucci ◽  
Nadia Casiraghi ◽  
Mara Maffeis ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Essential Hypertension ◽  
Baroreflex Sensitivity ◽  
Arterial Baroreflex ◽  
Slow Breathing ◽  
Arterial Baroreflex Sensitivity

Favorable effects of carotid endarterectomy on baroreflex sensitivity and cardiovascular neural modulation: a 4-month follow-up

2013 ◽  
Vol 304 (12) ◽  
pp. R1114-R1120 ◽  
Author(s):  
Laura Dalla Vecchia ◽  
Franca Barbic ◽  
Andrea Galli ◽  
Massimo Pisacreta ◽  
Rosella Gornati ◽  
...  
Keyword(s):  
Carotid Endarterectomy ◽  
Carotid Stenosis ◽  
High Frequency ◽  
Baroreflex Sensitivity ◽  
Low Frequency ◽  
Carotid Surgery ◽  
Sympathetic Activation ◽  
Arterial Baroreflex ◽  
Baroreceptor Sensitivity ◽  
Arterial Baroreflex Sensitivity

Carotid surgery variably modifies carotid afferent innervation, thus affecting arterial baroreceptor sensitivity. Low arterial baroreflex sensitivity is a well-known independent risk factor for cardiovascular diseases. The aim of this study was to assess the 4-mo effects of carotid endarterectomy (CEA) on arterial baroreceptor sensitivity and cardiovascular autonomic profile in patients with unilateral carotid stenosis. We enrolled 20 patients (72 ± 8 yr) with unilateral >70% carotid stenosis. ECG, beat-by-beat blood pressure, and respiration were continuously recorded before and 126 ± 9 days after CEA, at rest and during a 75° head-up tilt. Both pharmacological (modified Oxford technique, BRS) and spontaneous (index α, spectral analysis) arterial baroreflex sensitivity were assessed. Cardiovascular autonomic profile was evaluated by plasma catecholamines and spectral indexes of cardiac sympathovagal modulation [low-frequency R-R interval (LFRR), low frequency-to high frequency ratio (LF/HF), high-frequency R-R interval (HFRR)] and sympathetic vasomotor control [low-frequency systolic arterial pressure (LFSAP)] obtained from heart rate and SAP variability. After CEA, both the index α and BRS were higher ( P < 0.02) at rest. SAP variance decreased both at rest and during tilt ( P < 0.02). Before surgery, tilt did not modify the autonomic profile compared with baseline. After CEA, tilt increased LF/HF and LFSAP and reduced HFRR compared with rest ( P < 0.02). Four months after CEA was performed, arterial baroreflex sensitivity was enhanced. Accordingly, the patients' autonomic profile had shifted toward reduced cardiac and vascular sympathetic activation and enhanced cardiac vagal activity. The capability to increase cardiovascular sympathetic activation in response to orthostasis was restored. Baroreceptor sensitivity improvement might play an additional role in the more favorable outcome observed in patients after carotid surgery.

scholarly journals Arterial baroreflex function in older adults with neurocardiogenic syncope

2009 ◽  
Vol 32 (3) ◽  
pp. 191 ◽  
Author(s):  
Kenneth M Madden ◽  
Chris Lockhart
Keyword(s):  
Blood Pressure ◽  
Older Adults ◽  
Baroreflex Sensitivity ◽  
Arterial Baroreflex ◽  
Neurocardiogenic Syncope ◽  
Baroreflex Function ◽  
Large Numbers ◽  
Falls In Older Adults ◽  
Spontaneous Baroreflex ◽  
Arterial Baroreflex Sensitivity

Purpose: Neurocardiogenic syncope (formerly vasovagal) accounts for large numbers of falls in older adults and the mechanisms are poorly understood. This study examined the differences in baseline arterial baroreflex function in older adults with and without a neruocardiovascular response to orthostatic stress. Methods: Subjects were divided into two groups based on the presence (TT+ group) or absence (TT- group) of a neurocardiovascular response to upright tilting (70 degree head-up tilt for 10 minutes after 400 micrograms of sublingual nitroglycerin). A neurocardiovascular response was defined as presyncopal symptoms (lightheadedness) in association with at least a 30 mm Hg decrease in blood pressure. Before being divided into groups, baroreflex function was assessed using the spontaneous baroreflex method (baroreflex sensitivity, BRS). This method involves the analysis of “spontaneous” swings in blood pressure and heart rate that are mediated by the arterial baroreflexes. Results: 42 older adults (mean age 70.3±0.7 yr) were recruited, of which 18 were in the TT+ and 24 were in the TT- group. At baseline, the TT+ group demonstrated increased arterial baroreflex sensitivity in response to negative blood pressure sequences only (BRSdown, 11.2±1.9 vs. 7.3±1.0 ms/mm Hg, P=0.011). During tilt, the TT+ group demonstrated a much larger decrease in overall arterial baroreflex sensitivity than the TT- group (-6.8±1.2 vs. –3.2±0.9 ms/mm Hg, P=0.012). There was a negative correlation between BRSdown and length of tilt table test (r=-0.329, P=0.041) in the TT+ subjects. Conclusion: Older adults with neurocardiogenic syncope have exaggerated arterial baroreflex sensitivity at baseline.

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