An evaluation of large arteries compliance in man

1979 ◽  
Vol 237 (5) ◽  
pp. H550-H554 ◽  
Author(s):  
A. C. Simon ◽  
M. E. Safar ◽  
J. A. Levenson ◽  
G. M. London ◽  
B. I. Levy ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Vascular System ◽  
Diastolic Pressure ◽  
Arterial Compliance ◽  
Peripheral Resistance ◽  
Normal Subjects ◽  
K Value ◽  
Hypertensive Patients ◽  
Large Arteries ◽  
The Relationship

Cardiac output, blood pressure, and the characteristics of diastolic pressure decay were studied in 12 normal subjects and 23 sustained hypertensive patients of the same age. In normal subjects and in hypertensives, analysis of the diastolic decay showed that i) the form of the decay approximated a simple monoexponential curve during the last two-thirds of the diastolic segment, and ii) the time constant (t) of the curve was positively correlated with the total peripheral resistance (TPR), with an intercept of nearly zero. The validity of the relationship t = K x TPR was demonstrated both in groups of patients and also in individuals. Using a simple model for the vascular system, the K value was identified as the large arteries compliance and could thus be calculated in each individual. The values of arterial compliance was 1.26 +/- 0.04 ml.mmHg-1.m-2 in normal subjects and was significantly reduced in hypertensive patients (0.88 +/- 0.02 ml.mmHg=1.m-2,. P less than 0.001).

THE BRACHIAL TO DIGITAL BLOOD PRESSURE GRADIENT IN NORMAL SUBJECTS AND IN PATIENTS WITH HIGH BLOOD PRESSURE

1958 ◽  
Vol 36 (9) ◽  
pp. 889-893 ◽  
Author(s):  
P. Gaskell ◽  
A. M. Krisman
Keyword(s):  
Blood Pressure ◽  
Pressure Gradient ◽  
Diastolic Pressure ◽  
Systolic Pressure ◽  
Normal Subjects ◽  
Normal Blood ◽  
Control Group ◽  
Normal Blood Pressure ◽  
Hypertensive Patients ◽  
Systolic Pressure Gradient

The brachial and digital blood pressures were estimated by auscultatory techniques in 10 patients with essential hypertension and in a group of 6 subjects with normal blood pressure who were in a state of regulated peripheral vasoconstriction and again when they were in a state of regulated vasodilatation. The brachial to digital systolic and diastolic pressure gradients in both control subjects and hypertensive patients were greater when the individuals were heated than when they were cooled. The brachial to digital diastolic pressure gradient in the hypertensive patients was not significantly different from that in the subjects with normal blood pressure. However, the systolic pressure gradient was greater in the hypertensive patients than in the control group both when the individuals were heated and when they were cooled.

Relationship of arterial compliance to baroreflex function in hypertensive patients

1993 ◽  
Vol 265 (1) ◽  
pp. H232-H237 ◽  
Author(s):  
S. G. Lage ◽  
J. F. Polak ◽  
D. H. O'Leary ◽  
M. A. Creager
Keyword(s):  
Blood Pressure ◽  
Arterial Compliance ◽  
Normal Subjects ◽  
Arterial Baroreflex ◽  
Arterial Diameter ◽  
Hypertensive Patients ◽  
Baroreflex Function ◽  
Normotensive Subjects ◽  
Relationship Of ◽  
Carotid Arterial

The objectives of this study were to determine whether carotid arterial compliance is reduced in patients with hypertension and to assess whether reduced arterial compliance is related to abnormal arterial baroreflex function. Accordingly, concurrent measurements of carotid arterial diameter (via computerized high resolution B-mode ultrasonography) and blood pressure were made to determine carotid arterial compliance in 23 normotensive and 16 age-matched hypertensive patients. In addition, arterial baroreflex function was assessed in 12 of the normal subjects and nine of the hypertensive patients by measuring the infusions of nitroprusside and phenylephrine. Compared with the normotensive subjects, the patients with hypertension had reduced compliance (5.9 +/- 0.7 vs. 16.6 +/- 1.8 10(-7) m2/kPa, mean +/- SE, P < 0.001). The baroreflex slope relating the change in R-R interval to the change in systolic blood pressure during the drug infusions was less in the hypertensive than normotensive subjects (12.3 +/- 2 vs. 18.9 +/- 2 ms/mmHg, P < 0.05). Consequently, when both normotensive and hypertensive subjects were considered, there was a significant correlation between the baroreflex slope and compliance (r = 0.53, P < 0.05). However, there was no correlation between the baroreflex slope and compliance within either the normotensive group (r = 0.04, P = NS) or the hypertensive group (r = 0.43, P = NS) when analyzed separately. There was a significant correlation between age and compliance (r = -0.48, P < 0.01) but not between age and baroreflex function.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Relationships between Obesity, Cardiorespiratory Fitness, and Cardiovascular Function

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Kade Davison ◽  
Stefan Bircher ◽  
Alison Hill ◽  
Alison M. Coates ◽  
Peter R. C. Howe ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Cardiorespiratory Fitness ◽  
Arterial Compliance ◽  
Abdominal Fat ◽  
Whole Body ◽  
Metabolic Dysfunction ◽  
Body Fatness ◽  
Large Arteries ◽  
The Relationship ◽  
Cvd Mortality

Background. Obesity and low cardiorespiratory fitness (CRF) have been shown to independently increase the risk of CVD mortality. The aim of this study was to investigate the relationship between CRF, body fatness and markers of arterial function.Method and Results. Obese (9 male, 18 female; BMI 35.3 ± 0.9 kg·m-2) and lean (8 male, 18 female; BMI 22.5 ± 0.3 kg·m-2) volunteers were assessed for body composition (DXA), cardiorespiratory fitness (predicted max), blood pressure (BP), endothelial vasodilatator function (FMD), and arterial compliance (AC) (via radial artery tonometry). The obese group had more whole body fat and abdominal fat (43.5 ± 1.2% versus 27.2 ± 1.6%; and 48.6 ± 0.9% versus 28.9 ± 1.8%; resp.), and lower FMD (3.2 ± 0.4% versus 5.7 ± 0.7%; ) than the lean subjects, but there was no difference in AC. AC in large arteries was positively associated with CRF (; ) but not with fatness.Conclusion. These results indicate distinct influences of obesity and CRF on blood vessel health. FMD was impaired with obesity, which may contribute to arterial and metabolic dysfunction. Low CRF was associated with reduced elasticity in large arteries, which could result in augmentation of aortic afterload.

Sympathetic Responsiveness to Head-Up Tilt in Essential Hypertension

1973 ◽  
Vol 44 (3) ◽  
pp. 213-226 ◽  
Author(s):  
M. D. Esler ◽  
P. J. Nestel
Keyword(s):  
Blood Pressure ◽  
Creatinine Clearance ◽  
Diastolic Blood Pressure ◽  
Diastolic Pressure ◽  
Normal Subjects ◽  
Hypertensive Patients ◽  
Head Up Tilt ◽  
Normotensive Subjects ◽  
The Mean ◽  
Urinary Noradrenaline

1. The effect of 25° head-up tilt on blood pressure, urinary catecholamines, and creatinine clearance has been studied in untreated essential hypertensive patients and normotensive subjects. 2. The mean rise in diastolic pressure for all subjects with hypertension was 4.9 mmHg which did not differ significantly from the mean rise of 5.4 mmHg in the normal subjects. Ten of forty-one hypertensives had a diastolic pressure response greater than the response in any of eleven normal subjects, with a rise of greater than 10 mmHg. 3. The increase in urinary noradrenaline excretion with tilt was greater in these orthostatic hypertensive patients (1.74 μg/h) than in either the remaining hypertensive (0.34 μg/h) or the normotensive subjects (0.56 μg/h). Overall there was a significant correlation between changes in diastolic blood pressure and urinary noradrenaline. 4. Creatinine clearance was reduced by tilting. The mean reduction was similar for normally reacting hypertensive and normotensive subjects (6.0% and 7.2% respectively). The ten orthostatic hypertensive patients, however, had a greater reduction in creatinine clearance (23.4%), and in the hypertensive group as a whole changes in diastolic blood pressure and creatinine clearance were negatively correlated. 5. Those patients with excessive response to tilt tended to be young, not obese, and with recent onset of hypertension when documentation of this was adequate.

THE BRACHIAL TO DIGITAL BLOOD PRESSURE GRADIENT IN NORMAL SUBJECTS AND IN PATIENTS WITH HIGH BLOOD PRESSURE

1958 ◽  
Vol 36 (1) ◽  
pp. 889-893 ◽  
Author(s):  
P. Gaskell ◽  
A. M. Krisman
Keyword(s):  
Blood Pressure ◽  
Pressure Gradient ◽  
Diastolic Pressure ◽  
Systolic Pressure ◽  
Normal Subjects ◽  
Normal Blood ◽  
Control Group ◽  
Normal Blood Pressure ◽  
Hypertensive Patients ◽  
Systolic Pressure Gradient

The brachial and digital blood pressures were estimated by auscultatory techniques in 10 patients with essential hypertension and in a group of 6 subjects with normal blood pressure who were in a state of regulated peripheral vasoconstriction and again when they were in a state of regulated vasodilatation. The brachial to digital systolic and diastolic pressure gradients in both control subjects and hypertensive patients were greater when the individuals were heated than when they were cooled. The brachial to digital diastolic pressure gradient in the hypertensive patients was not significantly different from that in the subjects with normal blood pressure. However, the systolic pressure gradient was greater in the hypertensive patients than in the control group both when the individuals were heated and when they were cooled.

THE ELASTICITY OF THE LARGE ARTERIES IN HYPERTENSION

1952 ◽  
Vol 30 (2) ◽  
pp. 125-129
Author(s):  
J. P. Adamson ◽  
J. Doupe
Keyword(s):  
Blood Pressure ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Pulse Wave ◽  
Diastolic Pressure ◽  
Arterial Elasticity ◽  
Large Arteries ◽  
Wave Velocities

Intra-arterial pressures and pulse wave velocities were measured in 18 subjects whose auscultatory diastolic pressures ranged from 45 to 120 mm. Hg. Various methods were used to lower the blood pressure in the hypertensive and to raise it in nonhypertensive subjects so that pulse wave velocities might be compared in all subjects at a common diastolic pressure. The pulse wave velocities were calculated for a diastolic pressure of 80 mm. Hg. No significant differences were found between hypertensive and nonhypertensive subjects. It was concluded that a defect of arterial elasticity as gauged by pulse wave velocity is not a factor in the pathogenesis of hypertension.

scholarly journals Blood pressure level and laboratory indicators of disease severity in patients with arterial hypertension and COVID-19

2021 ◽  
Vol 28 (Supplement_1) ◽  
Author(s):  
K Popov ◽  
A Novitskiy ◽  
Y Shvarts
Keyword(s):  
Blood Pressure ◽  
Multivariate Analysis ◽  
Arterial Hypertension ◽  
Negative Correlation ◽  
Diastolic Pressure ◽  
Negative Relationship ◽  
Laboratory Parameters ◽  
Acute Period ◽  
Nonparametric Correlation ◽  
The Relationship

Abstract Funding Acknowledgements Type of funding sources: None. Background. Many patients with COVID-19 suffer from arterial hypertension and have marked variations in blood pressure (BP) during the acute period of infection. The reasons for such changes are poorly understood. Purpose. To assess the relationship between the level of BP and the severity of changes in the main clinical and laboratory parameters in patients with arterial hypertension and with a moderate course of COVID-19 at the stage of the height of the disease. Materials and methods. The study included 86 hospitalized patients with verified coronavirus disease of moderate severity: 46 of them were male, the median age was 65 years. Patients received adequate hypertension therapy for a long time. After hospitalization, treatment was adjusted if necessary. The level of laboratory parameters in the acute period of the disease was determined, including the electrolytes, C-reactive protein (CRP), albumin, ferritin, general blood test, etc. BP measured daily. The relationship between laboratory parameters and BP level was evaluated by nonparametric correlation using the Spearman coefficient and multivariate analysis based on the "generalized nonlinear model". Results. In 67.44% of patients with hypertension, an elevated BP level (&gt;140/90) was observed against the background of moderate COVID-19. There was a significant negative correlation between the levels of CRP and BP throughout the stay in the hospital, the most significant is the 5th day of hospitalization. At the same time, a slightly stronger relationship is observed with diastolic BP (r = -0.4425) than with systolic BP (r = -0.3525). A similar trend is observed in all BP measurements. Besides, a negative correlation was found between potassium levels and BP values. The strongest association of potassium levels is with systolic BP on the day of hospitalization (r = -0.4850) and diastolic pressure on the 1st day of hospitalization (r = -0.3561). Multivariate analysis confirmed independent and reliable "influence" of CRP (p = 0.00018) and potassium (p = 0.03921) as independent predictors of diastolic pressure. Conclusions. Most patients with hypertension and moderate COVID-19 have elevated BP levels. There is a statistically significant negative relationship between the values of BP and levels of CRP and potassium. The obtained data may correspond to the existing hypothesis about the significant role of the kinin–kallikrein system in the pathogenesis of COVID-19.

scholarly journals Improvement of intestinal flora: accompany with the antihypertensive effect of electroacupuncture on stage 1 hypertension

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jun-meng Wang ◽  
Ming-xiao Yang ◽  
Qiao-feng Wu ◽  
Ji Chen ◽  
Shu-fang Deng ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Intestinal Microbiota ◽  
Antihypertensive Effect ◽  
Intestinal Flora ◽  
Hypertensive Patients ◽  
Healthy Group ◽  
Oscillometric Device ◽  
Intestinal Dysbiosis ◽  
Stage 1 ◽  
The Relationship

Abstract Background Increasing evidence have indicated the relationship between intestinal dysbiosis and hypertension. We aimed to evaluate the effect of the electroacupuncture (EA) on intestinal microbiota in patients with stage 1 hypertension. Methods 93 hypertensive patients and 15 healthy subjects were enrolled in this study. Applying a highly accurate oscillometric device to evaluate the antihypertensive effect of EA. 16S rRNA sequencing was used to profile stool microbial communities from Healthy group, Before treatment (BT) group and After treatment (AT) group, and various multivariate analysis approaches were used to assess diversity, composition and abundance of intestinal microbiota. Results In this study, EA significantly decreased the blood pressure (BP) of hypertensive patients. Higher abundance of Firmicutes and lower Bacteroidetes abundance were observed in the BT group compared to the Healthy group. And EA treatment significantly decreased the Firmicutes/Bacteroidetes ratio compared to the BT group. Moreover, at the genus level, there was an increased abundance of Escherichia-Shigella in patients with hypertension, while Blautia were decreased, and EA reversed these changes. Conclusions Our study indicates that EA can effectively lower BP and improve the structure of intestinal microbiota which are correlate with the alteration of blood pressure by electroacupuncture. Trial registration: Clinicaltrial.gov, NCT01701726. Registered 5 October 2012, https://clinicaltrials.gov/ct2/show/study/NCT01701726

scholarly journals Relationship between Plasma Trimethylamine N-Oxide Levels and Renal Dysfunction in Patients with Hypertension

2021 ◽  
pp. 1-12
Author(s):  
Jia Zhou ◽  
Dingkun Wang ◽  
Bingong Li ◽  
Xuelian Li ◽  
Xingjun Lai ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Kidney Disease ◽  
Renal Dysfunction ◽  
High Performance ◽  
Characteristic Curve ◽  
Area Under The Curve ◽  
Hypertensive Patients ◽  
Ckd Stage ◽  
Liquid Chromatography Tandem Mass ◽  
The Relationship

<b><i>Introduction:</i></b> Trimethylamine N-oxide (TMAO) is a metabolite produced by gut bacteria. Although increased TMAO levels have been linked to hypertension (HTN) and chronic kidney disease (CKD) with poor prognosis, no clinical studies have directly addressed the relationship between them. In this study, we investigated the relationship between TMAO and renal dysfunction in hypertensive patients. <b><i>Methods:</i></b> We included healthy controls (<i>n</i> = 50), hypertensive patients (<i>n</i> = 46), and hypertensive patients with renal dysfunction (<i>n</i> = 143). Their blood pressure values were taken as the highest measured blood pressure. Renal function was evaluated using the estimated glomerular filtration rate. Plasma TMAO levels were measured using high-performance liquid chromatography tandem mass spectrometry. <b><i>Results:</i></b> We found significant differences in plasma TMAO levels among the 3 groups (<i>p</i> &#x3c; 0.01). The plasma TMAO of patients with HTN was significantly higher than that of healthy people, and the plasma TMAO of patients with HTN complicated by renal dysfunction was significantly higher than either of the other groups. Patients in the highest TMAO quartile were at a higher risk of developing CKD stage 5 than those in the lowest quartile. In the receiver operating characteristic curve, the area under the curve of TMAO combined with β 2-macroglobulin for predicting renal dysfunction in patients with HTN was 0.85 (95% confidence interval 0.80–0.90). <b><i>Conclusion:</i></b> An elevated TMAO level reflects higher levels of HTN and more severe renal dysfunction. TMAO, combined with β 2-macroglobulin levels, may assist in diagnosing CKD in hypertensive patients. Plasma TMAO has predictive value for early kidney disease in hypertensive patients.

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