scholarly journals Haemodynamic changes during neck pressure and suction in seated and supine positions

2002 ◽  
Vol 540 (2) ◽  
pp. 707-716 ◽  
Author(s):  
S. Ogoh ◽  
P. J. Fadel ◽  
F. Monteiro ◽  
W. L. Wasmund ◽  
P. B. Raven
Keyword(s):  
Haemodynamic Changes ◽  
Neck Pressure

Analysis of haemodynamic changes related to hepatic cirrhosis by an ultrasound contrast agent

2001 ◽  
Vol 120 (5) ◽  
pp. A2-A2
Author(s):  
G FELICIANGELI ◽  
G ARGALIA ◽  
L BOLOGNINI ◽  
T ABBATTISTA ◽  
M URBANI ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Hepatic Cirrhosis ◽  
Ultrasound Contrast Agent ◽  
Ultrasound Contrast ◽  
Haemodynamic Changes

Haemodynamic changes in human kidney allografts following administration of nifedipine: assessment with doppler spectrum analysis

1992 ◽  
Vol 5 ◽  
pp. S17-S20 ◽  
Author(s):  
J. W. S. Merkus ◽  
L. B. Hilbrands ◽  
A. J. Hoitsma ◽  
W. N. J. C. van Asten ◽  
R. A. P. Koene ◽  
...  
Keyword(s):  
Spectrum Analysis ◽  
Human Kidney ◽  
Doppler Spectrum ◽  
Haemodynamic Changes

scholarly journals Vascular and haemodynamic issues of brain ageing

2021 ◽  
Author(s):  
Lucy Beishon ◽  
Rebecca H. Clough ◽  
Meeriam Kadicheeni ◽  
Tamara Chithiramohan ◽  
Ronney B. Panerai ◽  
...  
Keyword(s):  
Significant Proportion ◽  
Cerebrovascular Diseases ◽  
Healthy Ageing ◽  
Cognitive Stimulation ◽  
High Morbidity ◽  
Age Related ◽  
Brain Ageing ◽  
Haemodynamic Changes ◽  
Normal Ageing ◽  
The Individual

AbstractThe population is ageing worldwide, thus increasing the burden of common age-related disorders to the individual, society and economy. Cerebrovascular diseases (stroke, dementia) contribute a significant proportion of this burden and are associated with high morbidity and mortality. Thus, understanding and promoting healthy vascular brain ageing are becoming an increasing priority for healthcare systems. In this review, we consider the effects of normal ageing on two major physiological processes responsible for vascular brain function: Cerebral autoregulation (CA) and neurovascular coupling (NVC). CA is the process by which the brain regulates cerebral blood flow (CBF) and protects against falls and surges in cerebral perfusion pressure, which risk hypoxic brain injury and pressure damage, respectively. In contrast, NVC is the process by which CBF is matched to cerebral metabolic activity, ensuring adequate local oxygenation and nutrient delivery for increased neuronal activity. Healthy ageing is associated with a number of key physiological adaptations in these processes to mitigate age-related functional and structural declines. Through multiple different paradigms assessing CA in healthy younger and older humans, generating conflicting findings, carbon dioxide studies in CA have provided the greatest understanding of intrinsic vascular anatomical factors that may mediate healthy ageing responses. In NVC, studies have found mixed results, with reduced, equivalent and increased activation of vascular responses to cognitive stimulation. In summary, vascular and haemodynamic changes occur in response to ageing and are important in distinguishing “normal” ageing from disease states and may help to develop effective therapeutic strategies to promote healthy brain ageing.

Time course and nature of postprandial haemodynamic changes in normal man

1989 ◽  
Vol 9 (1) ◽  
pp. 77-87 ◽  
Author(s):  
C. Mey ◽  
S. Hansen-Schmidt ◽  
D. Enterling ◽  
I. Meineke
Keyword(s):  
Time Course ◽  
Haemodynamic Changes ◽  
Normal Man

HAEMODYNAMIC CHANGES AND ADRENAL FUNCTION IN MAN DURING INDUCED HYPOGLYCAEMIA

1963 ◽  
Vol 44 (3) ◽  
pp. 430-442 ◽  
Author(s):  
B. Arner ◽  
P. Hedner ◽  
T. Karlefors ◽  
H. Westling
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Mean Arterial Blood Pressure ◽  
Peripheral Vascular ◽  
Adrenocortical Activity ◽  
Arterial Blood ◽  
Haemodynamic Changes ◽  
The Mean ◽  
Temporary Rise ◽  
Catechol Amines

ABSTRACT Observations were made on healthy volunteers during insulin induced hypoglycaemia (10 cases) and infusion of adrenaline (3 cases) or cortisol (1 case). In all cases a rise in the cardiac output was registered during insulin hypoglycaemia. The mean arterial blood pressure was relatively unchanged and the calculated peripheral vascular resistance decreased in all cases. A temporary rise in plasma corticosteroids was observed. After infusion of adrenaline similar circulatory changes were observed but no rise in plasma corticosteroids was found. Infusion of cortisol caused an increased plasma corticosteroid level but no circulatory changes. It is concluded that liberation of catechol amines and increased adrenocortical activity following hypoglycaemia are not necessarily interdependent.

HAEMODYNAMIC CHANGES IN THE MONCADA MODEL OF ATHEROSCLEROSIS

1992 ◽  
Vol 19 (5) ◽  
pp. 339-342 ◽  
Author(s):  
A. C. Yong ◽  
G. Townley ◽  
G. W. Boyd
Keyword(s):  
Haemodynamic Changes

Does the menstrual cycle influence the sensitivity of vagally mediated baroreflexes?

2002 ◽  
Vol 102 (6) ◽  
pp. 639-644 ◽  
Author(s):  
William H. COOKE ◽  
David A. LUDWIG ◽  
Paul S. HOGG ◽  
Dwain L. ECKBERG ◽  
Victor A. CONVERTINO
Keyword(s):  
Menstrual Cycle ◽  
Young Women ◽  
Regulatory Mechanisms ◽  
Physiological Changes ◽  
Menstrual Cycles ◽  
Time Points ◽  
Normal Menstrual Cycle ◽  
Cardiac Regulation ◽  
Neck Pressure ◽  
Noradrenaline Levels

The menstrual cycle provokes several physiological changes that could influence autonomic regulatory mechanisms. We studied the carotid-cardiac baroreflex in ten healthy young women on four occasions over the course of their menstrual cycles (days 0-8, 9-14, 15-20 and 21-25). We drew blood during each session for analysis of oestrogen, progesterone and noradrenaline (norepinephrine) levels, and assessed carotid-cardiac baroreflex function by analysing R-R interval responses to graded neck pressure sequences. Oestrogen levels followed a classical two-peak (cubic) response, with elevated levels on days 9-14 and 21-25 compared with days 0-8 and 15-20 (P =0.0032), while progesterone levels increased exponentially from days 9-14 to days 21-25 (P = 0.0063). Noradrenaline levels increased from an average of 137pg/ml during the first three measurement periods to 199pg/ml during days 21-25 (P = 0.0456). Carotid-cardiac baroreflex gain and operational point were not statistically different at any of the time points during the menstrual cycle (P⩾0.18). These findings are consistent with the notion that beat-to-beat vagal-cardiac regulation does not change over the course of the normal menstrual cycle.

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