Search results for "Pressure"

Noninvasive assessment of baroreflex sensitivity in post-MI patients by an open loop parametric model of RR-systolic pressure interactions

2003

Noninvasive evaluation of baroreflex sensitivity is considered an important goal for diagnosis and prognosis in post-MI patients. Methodological approach and physiological measure conditions may be the main causes for the differences found with respect to the standard Phenylephrine test. In this study, three linear parametric models, describing variability and mutual interactions of RR interval and systolic arterial pressure (SAP), were compared in relation to their ability to quantify baroreflex gain, using the Phenylephrine test index (Phe/sub BRS/) as reference. By monovariate autoregressive (AR) model, bivariate AR model and open loop ARXAR model, specific gain indexes (/spl alpha//sub …

Ambulatory Blood Pressure in Clinical Practice: Clinical Relevance of Circadian Rhythm and Nocturnal Dip

2012

Blood pressure (BP) variability and terms like dipper and nondipper are now common in daily practice. Several mechanisms underlie abnormalities in circadian variability. Sympathetic overactivity, reduced sensibility of baroreceptors, volume overload, and primary or secondary autonomic dysfunction are the most important factors related to abnormalities in circadian variability. The level of nighttime BP drop has been related to the absolute level of BP elevation, the global cardiovascular risk, the presence of comorbidities, and the type and time of administration of antihypertensive treatment. The relative importance of circadian variability or nocturnal BP as a prognostic factor raise not …

Response to Timing of Antihypertensive Therapy and Circadian Blood Pressure Pattern

2009

We thank Almirall et al1 for their interest in our article.2 In the present answer to their letter, we provide data from the Spanish Ambulatory Blood Pressure Monitoring Registry regarding clinical differences among patients depending on the time that they received their medication (Table). As shown, several differences were evident among groups, with respect to age, duration of hypertension, prevalence of diabetes mellitus, and history of …

Response to Nondipping in Patients With Hypertension

2009

We thank Ben-Dov and Bursztyn for their interest in our article1 and also for their positive feedback and criticism.2 We would like to try to answer directly to the 3 points raised in their letter. First, is siesta influencing the nocturnal BP dip? In the Spanish ambulatory blood pressure monitoring registry, the daytime period was calculated from the time of wake-up in the morning to the time of going to bed in the evening. However, in our opinion, 2 aspects minimize a possible …

Reproducibility and validity of ambulatory blood pressure monitoring in children.

2002

During the past several years ambulatory blood pressure monitoring (ABPM) has been introduced into the study of hypertension and has become a useful tool in making clinical decisions. The ABPM improves the reproducibility of the estimates of a subject's casual blood pressure (BP) both in normotensive and in hypertensive subjects, independent of age. The advantages of ambulatory BP (ABP) over its office counterpart have been studied in children to observe the relationship between BP measurement and early markers of organ damage. In different groups of subjects that have included normotensives, essential hypertensives, renal transplant recipients, or patients with repair of an aortic coarctat…

Relationship Between Ambulatory Artery Stiffness Index and Glomerular Filtration Rate in Essential Hypertension

2007

Twenty-four-hour blood pressure profile in idiopathic REM sleep behavior disorder

2022

Abstract Study Objectives To determine whether autonomic dysfunction in idiopathic REM sleep behavior disorder (iRBD) affects circadian blood pressure (BP) profile. Methods Twenty-one iRBD (mean age 68.8 ± 6.4, mean age at onset 62.2 ± 9.3), 21 drug-free de novo Parkinson’s disease (PD) and 21 control participants (HCs), comparable for age and sex, underwent 24-h ambulatory BP monitoring. A prospective follow-up study was performed to evaluate the occurrence of neurodegenerative disorders in the iRBD cohort. Results In the iRBD group, nighttime systolic BP (SBP) was higher (124.0 ± 20.0, p = .026), nocturnal BP decrease lower (4.0 ± 8.7% for SBP and 8.7 ± 8.0% for diastolic BP [DBP], p = .0…

Blood-pressure variability in patients with obstructive sleep apnea: current perspectives

2018

Obstructive sleep apnea (OSA) is often associated with hypertension and other cardiovascular diseases. Blood pressure (BP) variability is part of the assessment of cardiovascular risk. In OSA, BP variability has been studied mainly as very short-term (beat-by-beat) and short-term (24-hour BP profile) variability. BP measured on consecutive heartbeats has been demonstrated to be highly variable, due to repeated peaks during sleep, so that an accurate assessment of nocturnal BP levels in OSA may require peculiar methodologies. In 24-hour recordings, BP frequently features a "nondipping" profile, ie, <10% fall from day to night, which may increase cardiovascular risk and occurrence of major…

The Role of ABPM in Evaluation of Hypertensive Target-Organ Damage

2013

Casual blood pressure measurement has provided the basis for the present knowledge of the potential risk associated with hypertension and has guided patient management for many years. The possibility of carrying out repeated ambulatory blood pressure measurements using automatic or semiautomatic devices allows for the gathering of more representative values of blood pressure and for observing the behavior of blood pressure during both moments of activity as well as rest. Ambulatory blood pressure measurement is now increasingly recognized as being indispensable to the diagnosis and management of hypertension, and it has contributed significantly to our understanding of hypertension. Likewis…

Pulsatile and steady 24-h blood pressure components as determinants of left ventricular mass in young and middle-aged essential hypertensives

2003

In order to explore the relations between left ventricularmass (LVM) and the pulsatile (pulse pressure) andsteady (mean pressure) components of the bloodpressure (BP) curve, 304 young and middle-agedessential hypertensive patients were studied by meansof 24-h ambulatory BP monitoring and echocardio-graphy. In the overall study population, both the BPcomponents showed significant correlations with LVM.These correlations were unevenly distributed in thesubgroups of subjects younger and in those older than50 years. While in this latter subgroup, in multivariateanalysis, both 24-h mean BP (24-MBP) (b¼0.27;P¼0.008) and 24-h pulse pressure (24-h PP) (b¼0.23;P¼0.02) were associated with LVM, in th…