Search Results
Results 651 - 700 of 1763
< 9 10 11 12 13 14 15 16 17 18 19 >
Hope Sarah A - - 2004
Transfer function techniques are increasingly used for non-invasive estimation of central aortic waveform characteristics. Non-invasive radial waveforms must be calibrated for this purpose. Most validation studies have used invasive pressures for calibration, with little data on the impact of non-invasive calibration on transfer-function-derived aortic waveform characteristics. In the present study, ...
Camacho F - - 2004
The pressure pulse is amplified between the aorta and peripheral sites. This study compares two methods to estimate pressure pulse amplification (PPA) between the aorta and the brachial artery. Method 1: PPA was determined from a multi-parameter linear regression of subject parameters (gender, age, height, weight, heart rate (HR), brachial ...
O'Rourke Michael F - - 2004
Late systolic augmentation of the ascending aortic and central arterial pressure wave is a characteristic feature of aging, and is attributable to stiffening of the aorta and major central arteries. It is caused by increased pulse wave velocity in these vessels with early return of wave reflection from peripheral sites, ...
Duprez Daniel A - - 2004
BACKGROUND: Noninvasive techniques to evaluate arterial stiffness include noninvasive radial artery pulse contour analysis. Diastolic pulse contour analysis provides a separate assessment of large (C1) and small artery (C2) elasticity. Analysis of the systolic pulse contour identifies two pressure peaks (P1 and P2) that relate to incident and reflected waves. ...
Tomiyama Hirofumi - - 2004
Although blood pressure and age are major determinants of arterial stiffness, it is still unclear whether age-related changes in arterial stiffness are similar among subjects with different degrees of severity of hypertension. The present study examined the association between age and pulse wave velocity in subjects with different degrees of ...
Milla Carlos E - - 2004
High-frequency chest compression (HFCC) therapy has become the prevailing form of airway clearance for patients with cystic fibrosis (CF) in the United States. The original square waveform was replaced in 1995 with a sine waveform without published evidence of an equality of effectiveness. The recent development of a triangle waveform ...
Haesler Erik - - 2004
BACKGROUND: Pulse wave velocity (PWV), an index of arterial wall stiffness, is modulated by blood pressure (BP). Whether heart rate (HR) is also a modulator of PWV is controversial. Recent research involving mainly patients with high aortic PWV have found either no change or a positive correlation between the two. ...
Lubetzky Ronit - - 2004
Wide pulse pressure is considered to be a sign of patent ductus arteriosus (PDA). We tested the hypothesis that, following indomethacin therapy, PDA closure is associated with a significant decrease in pulse pressure. Thirty-two ventilated preterm infants were echocardiographically diagnosed within the first 24 hours of life with PDA. Systolic, ...
Covic Adrian - - 2004
BACKGROUND: Measurements of aortic stiffness [aortic pulse wave velocity (PWV) and augmentation index (Alx)] have been established as powerful predictors of survival on hemodialysis (HD). Abnormal endothelial-dependent and endothelial-independent vascular reactivity and increased arterial stiffness are commonly described in HD patients. There is, however, a lack of information on the ...
Izzo Joseph L JL - - 2004
PURPOSE OF REVIEW: This review is intended to provide the background for a new comprehensive hemodynamic view of the syndrome of systolic or wide pulse pressure hypertension and its hallmark abnormality: increased central arterial stiffness. RECENT FINDINGS: Studies of the pathogenesis of systolic hypertension have lagged. This review describes the ...
Kampus Priit - - 2004
OBJECTIVE: Among apparently healthy women and men, elevated levels of high-sensitivity C-reactive protein (hsCRP) predict the risk of cardiovascular events and may be useful for detecting subclinical atherosclerosis. The aim of this study was to investigate the associations between inflammatory markers, augmentation index (AIx), central pulse pressure and central systolic ...
Celutkiene Jelena - - 2004
AIMS: Doppler myocardial imaging (DMI) has been suggested as a method of quantifying induced ischaemia during dobutamine stress echocardiography (DSE). The aim of the present study was to investigate both standard systolic and diastolic parameters, but more specifically to address the phenomenon of post-systolic motion (PSM) as a marker of ...
Zoungas Sophia - - 2004
BACKGROUND: Atherosclerosis and Folic Acid Supplementation Trial (ASFAST) is a randomized placebo controlled trial assessing whether high-dose folic acid can reduce cardiovascular events and atherosclerosis progression in patients with chronic renal failure (CRF). Here we report the baseline results and compare indices of arterial structure (carotid intima-medial thickness (IMT)) and ...
Ng Kim-Gau - - 2004
The MediWatch is a wrist-mounted noninvasive blood pressure monitor designed to capture the radial pulse waveform using arterial tonometry and yield blood pressure measurements when the waveform is calibrated. An early prototype of this monitor uses a pulse-sensing system with a cylindrical plunger to applanate the radial artery. This prototype ...
Smithenson Bryan Todd - - 2004
OBJECTIVES: To quantify direction and velocity of blood flow in hepatic veins in dogs under different hemodynamic conditions by use of pulsed-wave Doppler ultrasonography. ANIMALS: 10 healthy dogs. PROCEDURE: Dogs were anesthetized, and venous flow velocities in the quadrate lobe were measured. Arterial blood pressure, right atrial pressure, pulmonary artery ...
Vy Christina Hong - - 2004
The purpose of this study was to evaluate the hemostatic efficacy and systemic cardiovascular effects of CollaCote collagen sponges saturated with 2.25% racemic epinephrine during endodontic surgery. A total of 48 patients participated in the study. Patients received CollaCote-saline or CollaCote-epinephrine placed in the bony crypt, after which hemostatic efficacy ...
Adji Audrey - - 2004
OBJECTIVE: Measurements of central aortic systolic and pulse pressure, either gauged directly or estimated indirectly, have been shown to be superior to brachial pressure in outcome studies. While the radial pressure convolution method has proved to satisfy the criteria for 'substantial equivalence' to measure central pressure non-invasively, this study sought ...
Mitchell Gary F - - 2004
With advancing age, arterial stiffness and wave reflections increase and elevate systolic and pulse pressures. An elevated central pulse pressure is generally ascribed to increased wave reflection and portends an unfavorable prognosis. Using arterial tonometry, we evaluated central (carotid-femoral) and peripheral (carotid-brachial) pulse wave velocity, amplitudes of forward and reflected ...
Bernard Susan L - - 2004
This report validates the use and limitations of the Nonin Pulse Oximeter for measuring heart rate and oxygen saturation in rats. Eight anesthetized Sprague-Dawley rats were intubated and catheterized. Oxygen saturation was directly measured from arterial blood by using a Radiometer OSM3 Hemoximeter adjusted for rat blood as well as ...
Rheeder P P Division of Clinical Epidemiology, University of - - 2004
To determine the value of ankle and toe blood pressure indices and pedal pulse palpation in the assessment of peripheral arterial disease in subjects with type 2 diabetes mellitus (DM). Cross-sectional study. A convenience sample of 85 female subjects with type 2 DM underwent a series of peripheral vascular assessments ...
Sugino Shigekazu - - 2004
PURPOSE: To compare the performance of a forehead probe to a conventional finger pulse oximetry probe in anesthetized patients. METHODS: Eighteen patients participated in the study. Each probe was connected to a Nellcor N-550 pulse oximeter. Anesthesia was induced and maintained with propofol. After intubation, the patients received air to ...
Pirro M - - 2004
BACKGROUND: Excess of cardiovascular risk among patients with chronic inflammatory diseases has been attributed to increased arterial stiffness. Hypercholesterolaemia has been demonstrated to promote a low-grade inflammatory status. The objective of the present study was to define, in hypercholesterolaemia, the influence of plasma lipids, low-grade inflammation, and indices of adiposity ...
Mullan Brian A - - 2004
Mortality increases when acute coronary syndromes are complicated by stress-induced hyperglycemia. Early pulse wave reflection can augment central aortic systolic blood pressure and increase left ventricular strain. Altered pulse wave reflection may contribute to the increase in cardiac risk during acute hyperglycemia. Chronic ascorbic acid (AA) supplementation has recently been ...
Vlachopoulos Charalambos - - 2004
BACKGROUND: Despite a decline in cigarette smoking, cigar smoking is increasing, partly due to the perception that it is a "safe" alternative to cigarettes. However, cigar smoking increases cardiovascular risk, but the mechanisms involved are not fully explored. Aortic stiffness and arterial wave reflection are important factors for the efficient ...
Boddaert Jacques - - 2004
OBJECTIVES: To test the hypothesis that impaired hemodynamic orthostatic changes commonly observed in the elderly may be related to age-related increase in arterial wall stiffness. DESIGN: Convenience sample of consecutive patients admitted for falls. SETTING: Acute- and intermediate-care geriatric ward of a French hospital. PARTICIPANTS: Fifty-seven elderly patients (46 women) ...
Azabji Kenfack Marcel - - 2004
Modelflow, when applied to non-invasive fingertip pulse pressure recordings, is a poor predictor of cardiac output (Q, litre x min(-1)). The use of constants established from the aortic elastic characteristics, which differ from those of finger arteries, may introduce signal distortions, leading to errors in computing Q. We therefore hypothesized ...
Wilson Andrew M - - 2004
BACKGROUND: An increasing number of arterial function assessments are available, including small and large arterial elasticity (SAE/C2, LAE/C1), endothelial function as measured by flow mediated dilation (FMD), carotid intima-medial thickness (IMT), ankle brachial index (ABI), pulse pressure (PP), and pulse wave velocity (PWV). We have consecutively performed these measures in ...
Geeraerts Thomas - - 2004
BACKGROUND: Left ventricular ejection time (LVET) measured in central arteries is modified during hypovolemia. We compared modifications of the pulse wave in a central artery (carotid) and in a peripheral artery (digital) during central hypovolemia induced by lower body negative pressure (LBNP) in conscious volunteers. METHODS: Hypovolemia was simulated with ...
Yasmin - - 2004
BACKGROUND: Arterial stiffness may be an early marker for vascular changes associated with hypertension in young adults. We investigated whether arterial stiffness measured as augmentation index and pulse wave velocity is increased in offspring of families with essential hypertension, and whether stiffness is related to various biochemical markers. METHODS: Two ...
Alfie José - - 2004
This study investigates whether an increased brachial pulse pressure (PP) in young healthy men constitutes a representative measure of the central hemodynamic forces, or the mere expression of an exaggerated upper limb amplification. Thirty two healthy men between 17 and 28 years old underwent noninvasive evaluation of systemic hemodynamics (impedance ...
Papaioannou Theodoros G - - 2004
OBJECTIVE: Aortic pulse wave analysis (PWA) reveals valuable information related to several hemodynamic characteristics mainly in normotensive and hypertensive patients. The main indices determined by PWA are augmentation index (AI) and reflection time index (RTI), which provide an indirect estimate of arterial stiffness and pulse wave velocity. The objective of ...
Doukas Apostolos G - - 2004
Pressure waves, which are generated by intense laser radiation, can permeabilize the stratum corneum (SC) as well as the cell membrane. These pressure waves are compression waves and thus exclude biological effects induced by cavitation. Their amplitude is in the hundreds of atmospheres (bar) while the duration is in the ...
Aronson Doron - - 2004
Elevated pulse pressure (PP), an indicator of increased arterial stiffness, has been shown to predict adverse outcome in patients with stable heart failure. However, the dependence of PP on hemodynamic factors, such as stroke volume and peak aortic blood flow, suggests that the relation between PP and outcome may depend ...
Pauca A L - - 2004
BACKGROUND: Simultaneous measurement of ascending aorta and radial artery pressure shows that mean and diastolic pressures (DP) are in close agreement in normotensive adults, while systolic pressures (SP) are not. However, in the aortic pressure wave, a second systolic peak appears with increasing age and increases to represent the SP ...
Shafik Ahmed - - 2004
The cause of diverticular disease (DD) is not exactly known, although colonic motor disorder has been proposed as a factor in the pathogenesis of the condition. We investigated the hypothesis that disordered colonic electrical activity is responsible for the colonic motor dysfunction and the development of DD. The electromyographic (EMG) ...
Yasmin - - 2004
OBJECTIVE: C-reactive protein (CRP) levels predict outcome in healthy individuals and patients with atherosclerosis. Arterial stiffness also independently predicts all-cause and cardiovascular mortality and may be involved in the process of atherosclerosis. The aim of this study was to investigate the relationship between stiffness and inflammation in a cohort of ...
Rhee Moo-Yong - - 2004
BACKGROUND: Increased aortic stiffness is a independent risk factor of cardiovascular disease in patients with hypertension. Acute changes of the heart rate (HR) have been reported not to affect the aortic stiffness in pacing. However, it is unknown whether acute changes in HR caused by sympathomimetics can affect the aortic ...
Covic Adrian - - 2004
BACKGROUND: Increased aortic stiffness markers--aortic pulse wave velocity (PWV) and augmentation index (AIx)--have emerged as powerful predictors of survival in haemodialysis (HD). Various and often contradictory abnormalities of endothelium-dependent (ED) and endothelium-independent (EID) vasomotor function, have been described in dialysis subjects, pre- and post-dialysis, using methods that are difficult to ...
McEleavy O D - - 2004
AIMS: To determine whether carotid-radial pulse wave velocity (crPWV), a simple non-invasive measurement of muscular artery structure and function, is increased in offspring of patients with Type 2 diabetes compared with well-matched controls with no family history of diabetes. Serum levels of intercellular adhesion molecule-1 (sICAM-1) were also examined. METHODS: ...
Susic Dinko - - 2004
Aging, diabetes, and hypertension are conditions in which arterial and myocardial stiffness is increased. Increased arterial stiffness is manifested by an increased systolic arterial pressure, pulse pressure and pulse wave velocity, whereas increased myocardial stiffness is manifested by impaired left ventricular diastolic filling. Moreover, increased arterial stiffness increases cardiac workload, ...
Lemogoum Daniel - - 2004
OBJECTIVE: Increased arterial stiffness is a determinant of cardiovascular mortality. Pulse wave velocity (PWV) is a direct measure of arterial stiffness. Aortic augmentation index (AI) and pulse pressure (PP) are surrogate measures of arterial stiffness. Both PWV, AI and PP increase with cardiovascular risk factors. The aim of this study ...
Miwa Yoshikazu - - 2004
Recent epidemiological studies suggested that calcifications of the aorta and the coronary arteries are important predictors for cardiovascular morbidity and mortality. However, the relation between blood pressure components and the progression of vascular wall calcification has remained unclear. We quantified calcium deposits in the abdominal aorta as the percentage of ...
Ruiz-Feria Ciro A - - 2004
Chickens (males more than females) have higher blood pressure (BP) than most mammals and spontaneously develop vascular neointimal plaques (NP) and diffuse subendothelial thickening in the lower segment of the abdominal aorta (AbA, referred to as 'NP-prone area') that partly resemble atherosclerotic lesions in mammals. NP areas, which are larger ...
Ferreira A S - - 2004
Pulse wave velocity (PWV) is an indicator associated with the arterial stiffness. Although this technique has been used in the diagnosis of systemic arterial hypertension (SAH), it cannot supply alone enough information about the pathogenesis of this disturbance. This paper aims to determine the compliance of brachial-radial arterial segment by ...
Danchin Nicolas - - 2004
BACKGROUND: In the general population, pulse pressure (PP) is a correlate of cardiovascular outcomes. Few data are available regarding the links between PP and documented coronary artery disease (CAD). METHODS: From July 2000 to January 2002, a total of 1337 patients referred for a first diagnostic coronary angiogram at 75 ...
Meinders Jan M - - 2004
Simultaneous assessment of diameter and pressure waveforms allows the calculation of the incremental compliance, distensibility, pulse wave velocity and elastic modulus as function of the distending pressure. However, the waveforms must be obtained at the same position and acquired and processed with the same filter characteristics to circumvent possible temporal ...
Amar Jacques - - 2004
BACKGROUND: Pulse pressure (PP), C reactive protein (CRP) and soluble intercellular adhesion molecule-1 (sICAM-1) levels have been associated with cardiovascular prognosis. Interestingly, previous reports have shown that PP was associated both with CRP and sICAM-1. The mechanisms underlying these associations remain unknown. On the one hand, it has been shown ...
te Velde Saskia J - - 2004
BACKGROUND: The association between low birthweight and increased blood pressure in later life has repeatedly been confirmed. Increased arterial stiffness may be an underlying mechanism for this phenomenon. This study investigated whether birthweight was related to blood pressure and local and regional arterial stiffness. METHODS: In 281 subjects (161 women), ...
Lau Alan H C - - 2004
1121 cases of patients with cerebrovascular disease (CVD) and non-CVD (NCVD) were evaluated by sex and age groups for the clinical differences between mean arterial blood pressure (MAP) and it's double product, mean pulse rate pressure (mPRP = MAP x pulse rate). Two treatment arms were also compared. One group ...
Pauwels Frederick E T - - 2004
OBJECTIVE: To measure changes in the modulus of elasticity (E) and describe histologic findings after extracorporeal shock wave therapy and radial pressure wave therapy on equine cortical bone specimens. SAMPLE POPULATION: 16 bone specimens from the proximodorsal cortex of an equine third metacarpal or metatarsal bone. PROCEDURE: Baseline E was ...
< 9 10 11 12 13 14 15 16 17 18 19 >