Abstract:
OBJECTIVE:This study evaluated the impact of prolonged circulatory unloading and subsequent left ventricular (LV) mass decrease on LV myocardial performance. Five-week head-down tilt (-6°) bed rest (HDTBR) was used as a model of prolonged circulatory unloading. METHODS:Ten young healthy male volunteers (age 23 ± 2 years) were studied a day before and within the first 24 h after the end of HDTBR by two-dimensional Doppler echocardiography and carotid applanation tonometry. LV preload and afterload, cardiac workload, LV mass and wall stress, LV chamber function and diastolic filling were assessed. Longitudinal, radial and circumferential myocardial strain rate were evaluated by tissue tracking algorithm. RESULTS:After HDTBR, stroke volume (P < 0.01), stroke work (P = 0.01) and LV mass (P < 0.001) decreased, whereas relative wall thickness, peak and end-systolic wall stress and ejection fraction remained unchanged. HDTBR was also followed by a decrease in longitudinal systolic strain rate (-1.11 ± 0.05 vs. -1.00 ± 0.05 s, P = 0.02) and a prolongation of isovolumic relaxation time (IVRT) (74 ± 2 vs. 82 ± 3 ms, P < 0.01). Bed rest-induced changes in LV mass index were directly related to changes in stroke work index (r = 0.65, P < 0.05), and changes in longitudinal systolic strain rate and IVRT correlated with changes in stroke volume index, directly and inversely, respectively (r = 0.69 and -0.64, P < 0.05 for both). CONCLUSION:A decrease in LV mass following HDTBR parallels the reduction in cardiac workload and is associated with an attenuation of longitudinal systolic myocardial deformation rate and prolongation of IVRT that seem to reflect a functional adaptation of cardiac muscle to lower LV volume load.
journal_name
J Hypertensjournal_title
Journal of hypertensionauthors
Kozàkovà M,Malshi E,Morizzo C,Pedri S,Santini F,Biolo G,Pagani M,Palombo Cdoi
10.1097/HJH.0b013e32833f5e01subject
Has Abstractpub_date
2011-01-01 00:00:00pages
137-43issue
1eissn
0263-6352issn
1473-5598journal_volume
29pub_type
杂志文章abstract:OBJECTIVE:In this randomized, double-blind, crossover study, the antihypertensive efficacy of amlodipine and nifedipine gastrointestinal therapeutic system (GITS) was compared following missed doses. Design and methods In a randomized crossover design, 42 patients were randomized to receive amlodipine (5-10 mg) or the ...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-200202000-00025
更新日期:2002-02-01 00:00:00
abstract:OBJECTIVE:During the Candesartan Antihypertensive Survival Evaluation in Japan (CASE-J) trial, patients with hypertension who received amlodipine had similar cardiovascular risks as those who received candesartan. We conducted a post-trial study, the Candesartan Antihypertensive Survival Evaluation in Japan 10-year fol...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001780
更新日期:2018-09-01 00:00:00
abstract::Nitric oxide formed by neuronal nitric oxide synthase (nNOS) in the brain, autonomic inhibitory (nitrergic) nerves, and heart plays important roles in the control of blood pressure. Activation of nitrergic nerves innervating the systemic vasculature elicits vasodilatation, decreases peripheral resistance, and lowers b...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/HJH.0b013e32832e8ddf
更新日期:2009-10-01 00:00:00
abstract:BACKGROUND:Inflammatory processes may play a pivotal role in the pathogenesis of cerebrovascular injury in salt-loaded, stroke-prone, spontaneously hypertensive rats (SHRSP). Thromboxane A2 (TP) receptor stimulation by 8-iso-prostaglandin F2alpha (8-iso-PGF2alpha) is involved in the process of vascular inflammation. O...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e3280464dc8
更新日期:2007-04-01 00:00:00
abstract:BACKGROUND:Genome-wide scans from Italy and China suggest a hypertension-susceptible locus between D2S2278 (nucleotides 11,245,080 - 11,245,358) and D2S168 (nucleotides 11,467,214 - 11,467,422) on chromosome 2. METHODS:We performed a large association study of polymorphisms in this region with blood pressure modulatio...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/01.hjh.0000166835.70935.3c
更新日期:2005-05-01 00:00:00
abstract::Many physiological variables known or thought to affect erythrocyte Na+,K+-cotransport are altered in pregnancy. The interrelationships of Na+,K+-cotransport and pregnancy were therefore examined. Values were elevated by more than 30% in both second and third trimesters with a return towards non-pregnant levels in the...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1988-02-01 00:00:00
abstract:OBJECTIVES:To determine whether 'slow pressor' hypertension from systemic angiotensin (Ang II) infusion was associated with renal vascular structural remodeling of the renal resistance vessels and glomerulus. METHODS:Ang II (4.5-10 ng/kg per min) or vehicle was infused for 10 days. Renal resistance vascular lumen chan...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200307000-00031
更新日期:2003-07-01 00:00:00
abstract:OBJECTIVES:Some beta-blockers are less effective in reducing central blood pressure than other antihypertensive drugs, which may explain the higher rate of events in subjects randomized to atenolol in recent trials. We hypothesized that nebivolol, a mixed beta-blocker/nitro-vasodilator, would be more effective than ate...
journal_title:Journal of hypertension
pub_type: 杂志文章,随机对照试验
doi:10.1097/HJH.0b013e3282f283c9
更新日期:2008-02-01 00:00:00
abstract:OBJECTIVE:To determine adrenocorticotrophin dose-response relationships for increase of blood pressure and metabolic parameters of the Sprague-Dawley rat. METHODS:We injected 120 male Sprague-Dawley rats twice daily subcutaneously for 10 days with 0.5, 1, 5, 50, 100, 200 or 500 microg/kg synthetic adrenocorticotrophin...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199816050-00006
更新日期:1998-05-01 00:00:00
abstract:OBJECTIVES:The current study aimed to investigate the value of the computed tomography-based left-versus-right adrenal gland volume ratio (L/Rv) in screening patients with unilateral primary aldosteronism. METHODS:The current study recruited 114 patients who underwent successful adrenal venous sampling (AVS) and adren...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000002271
更新日期:2020-02-01 00:00:00
abstract:DESIGN AND METHODS:Levels of dietary and serum potassium are thought to correlate inversely with vascular resistance and blood pressure. This study examined renal vascular resistance in perfused rat kidneys partially preconstricted with 10 micromol/ phenylephrine, quantifying changes in the resistance when levels of po...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199917100-00017
更新日期:1999-10-01 00:00:00
abstract:OBJECTIVE:Considering the growing body of evidence that indicates the contribution of superoxide anions (O2) and other reactive oxygen species (ROS) to the development of hypertension, we assessed whether animal models of hypertension have a benefic effect with tempol, a superoxide dismutase mimetic, to help augment th...
journal_title:Journal of hypertension
pub_type: 杂志文章,meta分析,评审
doi:10.1097/HJH.0000000000000422
更新日期:2015-01-01 00:00:00
abstract:OBJECTIVE:To examine the regulation by angiotensin II and by steroids of the expression of the angiotensin II AT1a and AT1b receptor genes in rat hearts. METHODS:Endogenous levels of angiotensin II in the rats were increased either by unilateral 0.2-mm renal artery clips or by subcutaneous infusions of frusemide (12 m...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1995-07-01 00:00:00
abstract:BACKGROUND:Recent studies indicated that central SBP could be estimated by radial late-SBP (rSBP2) with a small disparity. However, most of these studies were conducted by SphygmoCor with a transfer function. The agreement between rSBP2 and central SBP was also tested in several invasive studies, but with inconsistent ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e328342f05f
更新日期:2011-04-01 00:00:00
abstract:OBJECTIVES:To examine a possible relationship between baseline albuminuria and effect of losartan versus atenolol on cardiovascular (CV) events in hypertensive patients with left ventricular hypertrophy, the effect of losartan versus atenolol on albuminuria, and whether the benefits of losartan versus atenolol could be...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-200409000-00026
更新日期:2004-09-01 00:00:00
abstract:OBJECTIVES:It is estimated that there are more than 16 million adults with drug-resistant hypertension in China. Nevertheless, the prevalence of and risk factors for primary aldosteronism, a highly curable condition among adults with drug-resistant hypertension, has not been fully investigated. METHODS:Between January...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e328360ddf6
更新日期:2013-07-01 00:00:00
abstract:OBJECTIVE:Age, hypertension, diabetes mellitus and a history of cardiovascular disease are the most important factors related to the presence of cerebral white matter lesions (WML), which are a common finding in elderly people. This study investigates which factors related to hypertension per se are associated with the...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200203000-00028
更新日期:2002-03-01 00:00:00
abstract:BACKGROUND:The screening for primary aldosteronism is based on the aldosterone-renin ratio calculated with the plasma renin activity (PRA) value as denominator. A direct measurement of active renin (DRA) is being used as an alternative to PRA, but its diagnostic performance remains unclear. METHOD:We, therefore compar...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32833d2192
更新日期:2010-09-01 00:00:00
abstract:OBJECTIVES:To determine whether insulin sensitivity is impaired in normotensive offspring of essential hypertensives and to investigate how it relates to disturbed calcium metabolism. DESIGN:In 10 young lean, normotensive subjects with family histories of essential hypertension and in 10 age-matched controls we invest...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199304000-00013
更新日期:1993-04-01 00:00:00
abstract:BACKGROUND:Recent cross-sectional studies have suggested that higher serum sodium levels may be a marker of elevated blood pressure. It is unclear whether serum sodium levels are related to the risk of developing hypertension in the community. METHODS:We investigated the association of serum sodium with longitudinal b...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32830fe4a5
更新日期:2008-11-01 00:00:00
abstract::The present study investigated the roles of insulin on central cardiovascular regulation. When rats were fed with a high-salt diet for 4 weeks, hypothalamic and pituitary contents of insulin-like immunoreactive substance (ILI) significantly decreased. The plasma concentration of ILI remained unaltered, however. Intrac...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199106000-00006
更新日期:1991-06-01 00:00:00
abstract:OBJECTIVES:To investigate the mechanism of angiotensin II-induced apoptosis in cultured cardiomyocytes by determining which receptor subtype is involved, and what is the relationship between intracellular Ca2+ changes and apoptosis. DESIGN AND METHODS:Neonatal rat cardiomyocytes were pretreated with either the AT1 ant...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200109000-00022
更新日期:2001-09-01 00:00:00
abstract:OBJECTIVE:To determine the long-term efficacy and safety of a fixed, very-low-dose tablet combining one-half the standard dose of perindopril with one-quarter the standard dose of indapamide as first-line treatment in elderly patients. DESIGN:Double-blind, randomized, placebo-controlled study in an outpatient setting....
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1097/00004872-200018030-00013
更新日期:2000-03-01 00:00:00
abstract:AIM:To investigate same day repeated measures and diurnal variation of arterial stiffness, cardiac output (CO), stroke volume (SV) and total peripheral resistance (TPR) during the third trimester of normal pregnancy. METHODOLOGY:Pulse wave velocity (PWV) and augmentation index (AIx) were recorded using the Arteriograp...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001482
更新日期:2017-12-01 00:00:00
abstract:OBJECTIVES:Renal tubular sodium handling was measured in healthy subjects submitted to acute and chronic salt-repletion/salt-depletion protocols. The goal was to compare the changes in proximal and distal sodium handling induced by the two procedures using the lithium clearance technique. METHODS:In nine subjects, acu...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-200018110-00018
更新日期:2000-11-01 00:00:00
abstract:OBJECTIVE:A genetic polymorphism in the angiotensin II type 2 receptor (AGTR2 +1675G/A) has been associated with left ventricular hypertrophy (LVH). We tested whether this polymorphism affects LVH and left ventricular geometry parameters in patients with essential hypertension and cardiovascular disease who are treated...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32833aa356
更新日期:2010-06-01 00:00:00
abstract:OBJECTIVE:We report the prevalence, awareness, treatment, and control of hypertension across four Middle Eastern countries (Iran, Occupied Palestinian Territory, Saudi Arabia, and United Arab Emirates), using a standardized and uniform method. METHODS:The Prospective Urban Rural Epidemiology study enrolled participant...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001326
更新日期:2017-07-01 00:00:00
abstract:OBJECTIVE:Similar to cancer, pulmonary arterial hypertension (PAH) is characterized by vascular remodeling, which leads to obliteration of the small pulmonary arteriole, with marked proliferation of pulmonary artery smooth muscle cells (PASMC) and/or endothelial cells dysfunction. Aberrant expression of tumor suppresso...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001475
更新日期:2017-12-01 00:00:00
abstract::The effects of rilmenidine [(N-dicyclopropylmethyl) amino-2-oxazoline; S 3341], an alpha 2 agonist, on the hypertensive rat heart have been compared with those of propranolol, using a model of deoxycorticosterone acetate (DOCA)-salt hypertension. One week after nephrectomy and initial treatment with DOCA-salt, which w...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-198912000-00004
更新日期:1989-12-01 00:00:00
abstract::The cardiovascular responses to selective alpha 1- and alpha 2-adrenoceptor antagonism (with prazosin and idazoxan, respectively) were assessed in rats 4 weeks after unilateral nephro-adrenalectomy, contralateral adrenal enucleation and the provision of a 1% NaCl solution as drinking fluid (AEN rats) and in sham-opera...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1988-04-01 00:00:00