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カテゴリ:動脈硬化( 37 )

Arterial Stiffness

Hypertension Research (2011) 34, 202–208; doi:10.1038/hr.2010.196; published online 21 October 2010
Can arterial stiffness parameters be measured in the sitting position?
Jens Nürnberger1, Rene Michalski2, Tobias R Türk2, Anabelle Opazo Saez1, Oliver Witzke2 and Andreas Kribben2
1.1Department of Nephrology and Dialysis, HELIOS Kliniken Schwerin, Wismarsche Straße, Schwerin, Germany
2.2Department of Nephrology, University Hospital Essen, University Essen-Duisburg, Hufelandstraße, Essen, Germany
Correspondence: Dr J Nürnberger, Department of Nephrology, HELIOS Kliniken Schwerin, Wismarsche Straße 393-397, Schwerin 19049, Germany. E-mail: jens.nuernberger@uni-due.de
Received 2 May 2010; Revised 25 July 2010; Accepted 31 July 2010; Published online 21 October 2010.
Top of page
Abstract
Despite the introduction of arterial stiffness measurements in the European recommendation, pulse wave velocity (PWV) and augmentation index (AI) are still not used routinely in clinical practice. It would be of advantage if such measurements were done in the sitting position as is done for blood pressure. The aim of this study was to evaluate whether there is a difference in stiffness parameters in sitting vs. supine position. Arterial stiffness was measured in 24 healthy volunteers and 20 patients with cardiovascular disease using three different devices: SphygmoCor (Atcor Medical, Sydney, Australia), Arteriograph (TensioMed, Budapest, Hungary) and Vascular Explorer (Enverdis, Jena, Germany). Three measurements were performed in supine position followed by three measurements in sitting position. Methods were compared using correlation and Bland–Altman analysis. There was a significant correlation between PWV in supine and sitting position (Arteriograph: P<0.0001, r=0.93; Vascular Explorer; P<0.0001, r=0.87). There were significant correlations between AI sitting and AI supine using Arteriograph (P<0.0001, r=0.97), Vascular Explorer (P<0.0001, r=0.98) and SphygmoCor (P<0.0001, r=0.96). When analyzed by Bland–Altman, PWV and AI measurements in supine vs. sitting showed good agreement. There was no significant difference in PWV obtained with the three different devices (Arteriograph 7.5±1.6 m s−1, Vascular Explorer 7.3±0.9 m s−1, SphygmoCor 7.0±1.8 m s−1). AI was significantly higher using the Arteriograph (17.6±15.0%) than Vascular Explorer and SphygmoCor (10.2±15.1% and 10.3±18.1%, respectively). The close agreement between sitting and supine measurements suggests that both PWV and AI can be reliably measured in the sitting position.
Keywords:
arterial stiffness; augmentation index; PWV; pluse wave velocity
[PR]
by suwataisya | 2014-05-28 17:24 | 動脈硬化

Arterial Stiffness

Pulse Wave Analysis
The pulse wave reflects the condition of the entire arterial system, from the large arteries all the way to the small arteries.
Pulse wave analysis is a technique recognized long ago, since doctors in China measured it as part of traditional medicine, using the three fingers on the pulse method, and a long road of experience brought it into scientific knowledge.
The first graphic procedures for registration of pulse waves were first demonstrated in Paris (Marey) and then London (Mahomed) in the last century, then for a smaller audience of interested parties. 100 years ago, Mahomed used the sphygmomanometer to show asymptomatic high blood pressure and to test for chronic nephritis.
In the 20th century with the high-tech explosion, technologies offering fundamental and detailed information about the condition of the entire arterial system were developed, whose use and analysis is very simple.
Thus the non-invasive pulse wave test is now conducted with other methods. High-fidelity sensors, tonometers and piezo-techniques make it possible to observe and record the pulse wave shape more and more accurately. The recognition of changes in pressure makes it easier to understand hemodynamics and the process of arterial aging.
The pulse wave, depending on the method, can be felt and registered in areas where arterial pulsation is easily accessible. Measurement can be carried out most easily similarly to blood pressure measurement with tonometry and piezo-electric technologies on the carotid, radial and femoral arteries, and the newest, oscillometric methods on the upper arm.
The direct wave traveling toward the heart, the reflective wave and the systolic and diastolic periods can be determined from the pulse wave contour, and from this we can draw conclusions regarding the interaction of the heart and the arterial system, which until now could only be recognized using invasive arterial catheterization. Today, with the help of pulse wave analysis, we can better familiarize ourselves with the physiological and pathological behavior of the arterial wall, and determine a more exact diagnosis and therapy.
Pulse wave amplification
The shape of a blood pressure wave (BP) constantly distorts as it travels from the central elastic arteries toward the muscular conduit arteries. This is a physiological phenomenon, that the blood pressure, as a periodically oscillating wave, travels and reflects in occasionally differently structured portions of the viscoelastic arterial system. In healthy individuals, the pulse wave amplitude (pulse pressure (PP)) increases from the aorta/carotid section to the brachial/radial section without added energy, such that the arterial central pressure and the diastolic pressure remains almost unchanged.
This phenomenon is called pulse wave amplification, the change in the maximum systolic blood pressure level in the arterial system, its increase from the aorta toward the periphery. More and more clinical research focuses on the prognostic value of the peripheral and central systolic blood pressure levels.
Pulse wave amplification can be described in several different ways, the most well known being the ratio or difference between the distal and the proximal maximums.
From a physiological standpoint, in addition to a given brachial (peripheral) pulse pressure the most favorable effect on the heart and arterial system is an even lower central pressure value, since the heart must thus work against a lower pulsatile pressure (and the larger the difference in the absolute value of the periphery and central pressures, the more favorable the amplification). Pulse wave amplification, according to statistics, decreases with age.
In high blood pressure research and in heart and arterial system risk assessment the role of central blood pressure has come to the forefront, and today it is clear that it is a better marker than peripheral (upper arm) blood pressure for the condition of target organ damage and for cardiovascular risk and therapy.
The conventional, traditional method based on high blood pressure in quite a number of cases overestimates or underestimates cardiovascular risk. Furthermore it has become clear that the different pharmaceutical groups do not affect pulse pressure amplification in the same way; for example, vasodilator agents increase compared with the beta blockers. In contrast to brachial blood pressure, pulse wave amplification in and of itself predicts CV mortality, and shows a strong correlation with pulse pressure measured in the carotid as well – we can read this in a study of late-stage renal disease patients. Another publication provides evidence that in untreated patients suffering from essential high blood pressure they observed that following therapy a decrease in left ventricular mass index directly correlated to an increase in pulse wave amplification, and not to a decrease in brachial blood pressure. Benetos et al first carried out testing at the population level, in which they proved that PP amplification in and of itself correlates to cardiovascular mortality, independent of other risk factors.
[PR]
by suwataisya | 2014-05-28 17:23 | 動脈硬化

Arterial Stiffness

Evaluation of the Tensioday ambulatory blood pressure
monitor according to the protocols of the British
Hypertension Society and the Association for the
Advancement of Medical Instrumentation
Zso´ fia Ne´meth, Katalin Mo´cza´ r and Gyo¨rgy Dea´k
Background The validation of ambulatory blood
pressure monitoring devices is necessary to obtain
information on their accuracy. The objective of the
present study was to evaluate the accuracy of the
Tensioday oscillometric ambulatory blood pressure
monitor according to the protocols of the British
Hypertension Society and the Association for the
Advancement of Medical Instrumentation (AAMI).
Design We followed the phases recommended by the
British Hypertension Society protocol: before-use
calibration, in-use assessment, after-use calibration,
static device validation and report of the evaluation.
However, we expanded on the protocol to accommodate
features required by the AAMI.
Method The accuracy of calibration of three Tensioday
devices was tested before and after the in-use phase
when each of three devices was performing 10 24 h
sessions of ambulatory monitoring. As all three devices
passed these phases, the accuracy of blood pressure
measurement was tested in one arbitrarily selected
device on 85 subjects for systolic and 85 for diastolic
[PR]
by suwataisya | 2014-05-28 17:22 | 動脈硬化

Arterial Stiffness

Invasive validation of a new oscillometric device
(Arteriograph) for measuring augmentation index, central
blood pressure and aortic pulse wave velocity
Iva´n G. Horva´ tha, A´ da´m Ne´metha, Zso´ fia Lenkeya, Nicola Alessandrib,
Fabrizio Tufanob, Pa´ l Kisa, Bala´ zs Gasznera and Attila Czira´ kia
Background The importance of measuring aortic
pulse wave velocity (PWVao), aortic augmentation
index (Aix) and central systolic blood pressure
(SBPao) has been shown under different clinical
conditions; however, information on these
parameters is hard to obtain. The aim of this study
was to evaluate the accuracy of a new, easily applicable
oscillometric device (Arteriograph), determining these
parameters simultaneously, against invasive
measurements.
Methods Aortic Aix, SBPao and PWVao were measured
invasively during cardiac catheterization in 16, 55 and
22 cases, respectively, and compared with the values
measured by the Arteriograph.
Results We found strong correlation between the invasively
measured aortic Aix and the oscillometrically measured
brachial Aix on either beat-to-beat or mean value per patient
basis (rU0.9, P<0.001; rU0.94, P<0.001), which allowed
the noninvasive calculation of the aortic Aix without using
generalized transfer function. Similarly strong correlation
(rU0.95, P<0.001) was found between the invasively
measured and the noninvasively calculated central SBPao;
furthermore, the BHS assessment of the paired differences
[PR]
by suwataisya | 2014-05-28 17:21 | 動脈硬化

Aretial Stiffness

Arterial Assessment Validation Publications

Baulmann, J. et al.
“A new oscillometric method for assessment of arterial stiffness: comparison with tonometric and piezoelectronic methods”
J Hypertension 2008, 26:523-528

Jatoi, N.A., et al.
“Assessment of arterial stiffness in hypertension: comparison of oscillometric (Arteriograph), piezoelectronic (Complior) and tonometric (SphygmoCor) techniques”
H Hypertension 2009, 27:2186-2191

Boutouyrie P, Revera M and Parati G.
“Obtaining arterial stiffness indices from simple arm cuff measurements: the holy grail?”
J Hypertension 2009; 27: 2159-2161

Rajzer MW, Wojciechowska W, Klocek M, Palka I, Brzozowska-Kiszka M, Kawecka-Jaszcz K.
“Comparison of aortic pulse wave velocity measured by three techniques: Coplior, SphygmoCor and Arteriograph.”
J Hypertension 2008; 26:2001-7

Horvath, G.I. et al.
“Invasive validation of a new oscillometric device (Arteriograph) for measuring augmentation index, central blood pressure and aortic pulse wave velocity.:
J Hypertension 2010, 28:2068-2075

Parati G, Buyzere de M
“Evaluating aortic stiffness through an arm cuff oscillometric device: is validation against invasive measurements enough?”
Journal of Hypertension 2010, 28:2003-2006
[PR]
by suwataisya | 2014-05-28 17:20 | 動脈硬化

Arterial Stiffness

Anew oscillometric method for assessment of arterial stiffness:
comparison with tonometric and piezo-electronic methods
Johannes Baulmanna, Ulrich Schillingsb, Susanna Rickertb, Sakir Uenb, Rainer
Du¨ singb, Miklos Illyesc, Attila Czirakic, Georg Nickenigb and Thomas Mengdenb
Introduction Pulse wave velocity (PWV) and augmentation
index (AIx) are parameters of arterial stiffness and wave
reflection. PWV and AIx are strong indicators for
cardiovascular risk and are used increasingly in clinical
practice. Previous systems for assessment of PWV and AIx
are investigator dependent and time consuming. The aim of
this study was to validate the new oscillometric method
(Arteriograph) for determining PWV and AIx by comparing it
to two clinically validated, broadly accepted tonometric and
piezo-electronic systems (SphygmoCor and Complior).
Design and method PWV and AIx were measured up to five
times in 51 patients with the SphygmoCor, Complior and
Arteriograph. In 35 patients, the measurements were
repeated after 1 week in a second session using the
same protocol.
Results The correlations of the PWV as assessed with the
Arteriograph with the values obtained using the
SphygmoCor (rU0.67, P < 0.001) and the Complior
(rU0.69, P < 0.001) were highly significant. Variability and
reproducibility for PWV were best for the Arteriograph,
followed by Complior and SphygmoCor. AIx (SphygmoCor
[PR]
by suwataisya | 2014-05-28 17:19 | 動脈硬化

Arterial Stiffness

American Journal of Hypertension
ajh.oxfordjournals.org
Am J Hypertens (2005) 18 (S4): 15A. doi: 10.1016/j.amjhyper.2005.03.035
P-17: A new and fast screening method for measuring complex hemodynamical parameters and arterial stiffness non-invasively with a simple arm cuff
Miklos Illyes1
+ Author Affiliations
1TensioMed Ltd., TensioMed Ltd, Budapest, Hungary
Abstract
Aims: In a project of the National Research Program of Hungary, we studied if oscillometric signals received during an oscillometric BP measurement contain any information about arterial hemodynamics
Materials, Methods: We have developed a research tool by which not only SBP, DBP, HR data, but the complete oscillometric signals were stored and transmitted telemedically to our computer center from the home of 650 patients who performed BP measurements at least 4 times a day, for at least 1 month. Through this a large database was collected, containing more than 1700000 oscillometric pulse curves and the relevant clinical data of patients. For data mining we used Kohonen's self-organising map method. Non-invasively recorded oscillometric curves from the upper arm cuff were validated by the simultaneously recorded intraarterial pressure curve of brachial artery.
Results: Our researches showed that oscillometric pulse curve of the brachial artery is identical to the intraarterial pressure curve if the cuff was inflated to suprasystolic pressure, preferably 35 mmHg above the SBP. Thus the early and the late systolic pressure peak, the closing incisure of the aortic valve can be recognizable, and several hemodinamical parameters could be calculated.
By using the mentioned results of basic researches, a new instrument, the TensioClinic Arteriograph was developed, by which the following parameters could be measured within 2 minutes, by using a simple upper arm cuff:
SBP, DBP, HR, MAP, PP, augmentation index (AIx), normalized augmentation index to 80/min heart rate (AIx80), return time of the pulse wave of the aorta (RT), pulse wave velocity (PWV) of the aorta, length of the cardiac cycle, area of systolic (SAI) and diastolic (DAI) part of pulse curve.
Validation studies of the new method to control the accuracy of measured AIx and PWV showed high correlations (R = 0,76 and R = 0,8) with values measured with other non-invasive methods (Sphygmocor and Complior) respectively.
Conclusions: Due to the swiftness, simplicity and good reproducibility of this method and apparatus, the non-invasive assessment of the most important hemodynamical parameters and arterial stiffness had become available for population screening, opening a new window in the detection of the early phase of the athero- and arteriosclerosis, and thus it can play an important role in the reduction of the CV morbidity and mortality.
[PR]
by suwataisya | 2014-05-28 17:18 | 動脈硬化

Arterial Stiffness

Assessment of arterial stiffness in hypertension: comparison of oscillometric (Arteriograph), piezoelectronic (Complior) and tonometric (SphygmoCor) techniques.
Noor A Jatoi, Azra Mahmud, Kathleen Bennett, John Feely
Department of Pharmacology and Therapeutics, Trinity College Centre for Health Sciences and Hypertension Clinic, St. James's Hospital, Dublin, Ireland.
Journal of hypertension (impact factor: 4.02). 10/2009; 27(11):2186-91. DOI:10.1097/HJH.0b013e32833057e8
Source: PubMed
ABSTRACT Arterial stiffness, measured as aortic pulse wave velocity (PWV), and wave reflection, measured as augmentation index (AIx), are independent predictors for total and cardiovascular morbidity and mortality. The aim of this study was to compare a new device
[PR]
by suwataisya | 2014-05-28 17:17 | 動脈硬化

Arterial Stiffness

Clin Cardiol. 2012 Jan;35(1):26-31. doi: 10.1002/clc.20999. Epub 2011 Nov 14.
Comparison of aortic and carotid arterial stiffness parameters in patients with verified coronary artery disease.
Gaszner B, Lenkey Z, Illyés M, Sárszegi Z, Horváth IG, Magyari B, Molnár F, Kónyi A, Cziráki A.
Source
Heart Institute, Faculty of Medicine, University of Pécs, Hungary.
Abstract
BACKGROUND:
Arterial stiffness parameters are commonly used to determine the development of atherosclerotic disease. The independent predictive value of aortic stiffness has been demonstrated for coronary events.
HYPOTHESIS:
The aim of our study was to compare regional and local arterial functional parameters measured by 2 different noninvasive methods in patients with verified coronary artery disease (CAD). We also compared and contrasted these stiffness parameters to the coronary SYNTAX score in patients who had undergone coronary angiography.
METHODS:
In this study, 125 CAD patients were involved, and similar noninvasive measurements were performed on 125 healthy subjects. The regional velocity of the aortic pulse wave (PWVao) was measured by a novel oscillometric device, and the common carotid artery was studied by a Doppler echo-tracking system to determine the local carotid pulse wave velocity (PWVcar). The augmentation index (AIx), which varies proportionately with the resistance of the small arteries, was recorded simultaneously.
RESULTS:
In the CAD group, the PWVao and aortic augmentation index (Alxao) values increased significantly (10.1 ± 2.3 m/sec and 34.2% ± 14.6%) compared to the control group (9.6 ± 1.5 m/sec and 30.9% ± 12%; P < 0.05). We observed similar significant increases in the local stiffness parameters (PWVcar and carotid augmentation index [Alxcar]) in patients with verified CAD. Further, we found a strong correlation for PWV and AIx values that were measured with the Arteriograph and those obtained using the echo-tracking method (r = 0.57, P < 0.001 for PWV; and r = 0.65, P < 0.001 for AIx values).
CONCLUSIONS:
Our results indicate that local and regional arterial stiffness parameters provide similar information on impaired arterial stiffening in patients with verified CAD.
© 2011 Wiley Periodicals, Inc.
[PR]
by suwataisya | 2014-05-28 17:16 | 動脈硬化

Arterial Stiffness

Hypertension Research (2011) 34, 202–208; doi:10.1038/hr.2010.196; published online 21 October 2010
Can arterial stiffness parameters be measured in the sitting position?
Jens Nürnberger1, Rene Michalski2, Tobias R Türk2, Anabelle Opazo Saez1, Oliver Witzke2 and Andreas Kribben2
1.1Department of Nephrology and Dialysis, HELIOS Kliniken Schwerin, Wismarsche Straße, Schwerin, Germany
2.2Department of Nephrology, University Hospital Essen, University Essen-Duisburg, Hufelandstraße, Essen, Germany
Correspondence: Dr J Nürnberger, Department of Nephrology, HELIOS Kliniken Schwerin, Wismarsche Straße 393-397, Schwerin 19049, Germany. E-mail: jens.nuernberger@uni-due.de
Received 2 May 2010; Revised 25 July 2010; Accepted 31 July 2010; Published online 21 October 2010.
Top of page
Abstract
Despite the introduction of arterial stiffness measurements in the European recommendation, pulse wave velocity (PWV) and augmentation index (AI) are still not used routinely in clinical practice. It would be of advantage if such measurements were done in the sitting position as is done for blood pressure. The aim of this study was to evaluate whether there is a difference in stiffness parameters in sitting vs. supine position. Arterial stiffness was measured in 24 healthy volunteers and 20 patients with cardiovascular disease using three different devices: SphygmoCor (Atcor Medical, Sydney, Australia), Arteriograph (TensioMed, Budapest, Hungary) and Vascular Explorer (Enverdis, Jena, Germany). Three measurements were performed in supine position followed by three measurements in sitting position. Methods were compared using correlation and Bland–Altman analysis. There was a significant correlation between PWV in supine and sitting position (Arteriograph: P<0.0001, r=0.93; Vascular Explorer; P<0.0001, r=0.87). There were significant correlations between AI sitting and AI supine using Arteriograph (P<0.0001, r=0.97), Vascular Explorer (P<0.0001, r=0.98) and SphygmoCor (P<0.0001, r=0.96). When analyzed by Bland–Altman, PWV and AI measurements in supine vs. sitting showed good agreement. There was no significant difference in PWV obtained with the three different devices (Arteriograph 7.5±1.6 m s−1, Vascular Explorer 7.3±0.9 m s−1, SphygmoCor 7.0±1.8 m s−1). AI was significantly higher using the Arteriograph (17.6±15.0%) than Vascular Explorer and SphygmoCor (10.2±15.1% and 10.3±18.1%, respectively). The close agreement between sitting and supine measurements suggests that both PWV and AI can be reliably measured in the sitting position.
Keywords:
arterial stiffness; augmentation index; PWV; pluse wave velocity
[PR]
by suwataisya | 2014-05-28 17:15 | 動脈硬化


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