Abstract:
:The primary purpose of the arterial baroreflex is to keep blood pressure close to a particular set point over a relatively short period of time. The rapid resetting of arterial baroreceptor afferents toward any sustained new level of blood pressure ensures that the reflex acts as an effective buffer of short-term blood pressure fluctuations that accompany daily life but also ensures that arterial baroreflexes play little role in setting the long-term level of blood pressure. Nevertheless, the minimization of blood pressure variability by baroreflex mechanisms is important as studies suggest that a diminished baroreflex is an independent risk factor or sudden death after myocardial infarction. In hypertensive humans and animals, the baroreflex control of heart rate is diminished. Using the steady-state method for assessment of the cardiac baroreflex in rats, we have shown that the change in baroreflex sensitivity is due to a reduction in the vagal range. Although the cardiac sympathetic component of the baroreflex is normal, the level of cardiac sympathetic activity is enhanced, particularly in young hypertensive rats. We have shown that there is a stronger inverse relationship between vagal heart rate range and levels of cardiac hypertrophy than with other variables, such as blood pressure, hypertension, or indexes of vascular hypertrophy. Treatments that reduce cardiac hypertrophy restore cardiac vagal function. Centrally acting antihypertensive agents increase the sensitivity of vagal baroreceptor heart rate reflexes, mainly through an action on central alpha 2-adrenoceptors. They also reduce cardiac sympathetic activity and diminish cardiac sympathetic baroreflexes through a non-alpha 2-adrenoceptor, possibly an imidazoline receptor mechanism. Both of these effects are beneficial in hypertension, where cardiac sympathetic function is enhanced and vagal activity is reduced. Thus, these actions would be expected to cause a desirable reduction in blood pressure variability. The effect of hypertension on baroreflex control of sympathetic vasomotor function is less clear. Studies have shown diminished, normal, and enhanced sympathetic vasomotor baroreflex control. Basal renal sympathetic drive, however, appears to be increased in human essential hypertension. Our studies in conscious rabbits have shown that rilmenidine reduces renal sympathetic baroreflex function. Rilmenidine acts principally at the level of the rostral ventrolateral medullary imidazoline receptors to markedly reduce the basal renal sympathetic nerve activity and the maximum response to transient fluctuations in blood pressure. Thus, in addition to their antihypertensive actions, centrally acting agents, such as rilmenidine, reduce cardiac and renal sympathetic baroreflex responses and increase cardiac vagal baroreflex sensitivity. This provides an ideal profile of action for the restoration of baroreflex function in addition to reversal of cardiac and vascular hypertrophy in hypertension.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Head GAsubject
Has Abstractpub_date
1995-01-01 00:00:00pages
S7-16eissn
0160-2446issn
1533-4023journal_volume
26 Suppl 2pub_type
杂志文章,评审abstract::Interventions that inhibit neutrophil infiltration into myocardial tissue after ischaemia and reperfusion are reported to reduce the size of the infarct. We examined whether administration of trimetazidine, which is reported to reduce myocardial infarct size, affects this process. [111In]Neutrophils and [125I]albumin ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199312000-00008
更新日期:1993-12-01 00:00:00
abstract::Calcium antagonists can be used with a number of other antihypertensive compounds. The combined use of a dihydropyridine calcium antagonist and beta-blocker is well established and is probably the most efficacious combination for routine use. Angiotensin-converting enzyme (ACE) inhibitors may also constitute a suitabl...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:
更新日期:1991-01-01 00:00:00
abstract::The distribution of catecholamine (CA)-containing neurones and tissue noradrenaline (NA) concentration was investigated in pig hearts with and without myocardial ischemia. All hearts were shock-frozen using a Wollenberger clamp, and tissue samples were obtained from the mid- and apical left ventricular wall (nonischem...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198500075-00015
更新日期:1985-01-01 00:00:00
abstract::We compared the vasodilator potencies of a number of Ca2+-entry blockers with glyceryl trinitrate (GTN) in isolated ring segments of dog coronary arteries contracted by a variety of substances. Rings were contracted to 80% of maximum by serotonin, phenylephrine (PE), noradrenaline (NA), K+ (KCl), or U46619 (stable thr...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198303000-00026
更新日期:1983-03-01 00:00:00
abstract::We investigated the hemodynamic and inotropic effects of the new class III antiarrhythmic drug melperone. In eight pentobarbital-anesthetized dogs, the effects of intravenous melperone 0.5, 2.5, and 12.5 mg/kg-1 were tested. During atrial pacing we measured cardiac output (CO), mean aortic blood pressure (MAP), right ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198207000-00017
更新日期:1982-07-01 00:00:00
abstract::The quantitative receptor autoradiographic method we used revealed that specific [125I]endothelin-1 ([125I]ET-1) binding sites are highly concentrated in the choroid plexus (ChP), subfornical organ (SFO), lacunosum molecular layer of the hippocampus (LMol), and granular layer of the cerebellum (GC) of the rat brain. [...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199100177-00037
更新日期:1991-01-01 00:00:00
abstract::The effects of long-term treatment with differing dosages of captopril and hydrochlorothiazide in combination were evaluated in 22 hypertensive patients. There was no significant difference in antihypertensive efficacy between captopril 25 mg twice a day in combination with hydrochlorothiazide 25 mg once or twice dail...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005344-198507001-00014
更新日期:1985-01-01 00:00:00
abstract::The mechanism by which enoximone, a reported phosphodiesterase inhibitor, inhibits the oxidation of long-chain fatty acids was studied in isolated rat heart mitochondria using a series of 14C-labeled substrates. Enoximone decreased palmitate oxidation in a time- and concentration-dependent manner. Fifty percent inhibi...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199206000-00009
更新日期:1992-06-01 00:00:00
abstract::Some recent studies complementing earlier reports on the pharmacology and pharmacokinetics of indoramin are briefly reviewed. Competitive blockade of peripheral postsynaptic alpha 1-adrenoceptors is confirmed as the primary mechanism for the antihypertensive activity of indoramin. Various reasons have been proposed to...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
doi:10.1097/00005344-198600082-00004
更新日期:1986-01-01 00:00:00
abstract::To investigate the role of endothelin (ET) in severe hypertension, endothelial dysfunction hypercholesterolemic stroke-prone spontaneously hypertensive rats (SHRSP on a 5% cholesterol diet) were additionally fed with 1% NaCl and 0.023% nitro-L-arginine. Under these conditions, all untreated rats died within 30 days (m...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199800001-00069
更新日期:1998-01-01 00:00:00
abstract::The effect of olmesartan medoxomil (OLM), an angiotensin II receptor blocker (ARB), on advanced nephropathy and mortality was evaluated in Zucker Diabetic Fatty (ZDF) rats, a type 2 diabetes model. OLM was administered from 36 weeks of age, when the animals developed advanced proteinuria. OLM effectively suppressed th...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/01.fjc.0000245241.79959.d6
更新日期:2006-10-01 00:00:00
abstract::The new anti-anginal drug ranolazine causes a slight (<10 milliseconds) prolongation of the QT interval, raising the concern that its use may be associated with an increased incidence of torsades de pointes ventricular tachyarrhythmias. The goal of this study was to show that ranolazine inhibits the late component of ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200408000-00008
更新日期:2004-08-01 00:00:00
abstract::We studied the short-term effects of oral administration of nisoldipine (10 mg) and propranolol (80 mg) alone and in combination in 14 patients with chronic exertional angina pectoris in a double-blind, randomized, cross-over study. The 14 patients (13 men and 1 woman, mean age 56 +/- 7 years) performed symptoms-limit...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005344-199008000-00020
更新日期:1990-08-01 00:00:00
abstract::We wished to determine the action of prostaglandins (PG) and to analyze pharmacologically the mechanisms of their action in isolated human uterine arteries in special reference to mediators liberated from the endothelium and subendothelial tissues. Helical strips of the human uterine artery with and without the endoth...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199508000-00021
更新日期:1995-08-01 00:00:00
abstract::We compared platelet function results obtained with the VerifyNow P2Y12 (VN-P2Y12) point-of-care device and the light transmission aggregometry (5 and 20 microM adenosine diphosphate) method using an integrated database of eight clinical trials with a total of 591 subjects. The study was performed in healthy subjects,...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e3181dd0ec2
更新日期:2010-07-01 00:00:00
abstract::Calcium is a signaling element of general importance to cells. In muscle, its key function is the activation of troponin C, which is essential for the contraction of myofibrils in skeletal and heart muscles, and of myosin light chain kinase, which is essential for the contraction of smooth muscles. Calcium modulates t...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:
更新日期:1988-01-01 00:00:00
abstract::In helical strips of dog cerebral, coronary, mesenteric, and renal arteries treated with ONO3708, an inhibitor of vasoconstricting prostaglandin (PG) receptors, and previously contracted with serotonin, PGF2 alpha, PGD2 and epithio-methano thromboxane A2 (sTxA2), a TxA2 analog, caused a relaxation. The cerebral arteri...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198803000-00014
更新日期:1988-03-01 00:00:00
abstract::The functional role of beta(3)-adrenergic receptors in the heart is still not clear. The actions of two widely used beta(3)-adrenoceptor agonists, such as BRL 37344 and CGP 12177, were studied in the isolated guinea pig heart, perfused at constant pressure according to the Langendorff technique. Heart contractility (d...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200305000-00006
更新日期:2003-05-01 00:00:00
abstract::We studied the effects of cicletanine, an anti-hypertensive drug, on reperfusion arrhythmias in relation to 6-keto-PGF1 alpha, thromboxane B2 (TXB2), and ion shifts (Na+, K+, Ca2+, and Mg2+) induced by ischemia and reperfusion in hearts isolated from spontaneously hypertensive rats. Hearts were subjected to 30-min glo...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1991-04-01 00:00:00
abstract::The mode of action of Crataegus extracts in the treatment of heart failure is still under examination. WS 1442, a standardized special extract from Crataegus leaves with flowers, exerts direct positive inotropic effects. This study was designed to investigate the mode of inotropic action of WS 1442 in human myocardium...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200005000-00004
更新日期:2000-05-01 00:00:00
abstract::This investigation demonstrates an increase in endothelin (ET)-mediated vascular tone in peri-ischemic areas after experimental focal cerebral ischemia (middle cerebral artery occlusion) in the cat. Adventitial application of the butenolide antagonist PD155080 (30 microM), after MCA occlusions resulted in marked incre...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-01-01 00:00:00
abstract::Accelerated atherosclerosis and its long-term sequelae are a major cause of late mortality among patients with systemic lupus erythematosus (SLE). Traditional Framingham risk factors such as hypertension, hypercholesterolemia, diabetes, and smoking do not account in entirety for this risk. SLE specific factors like di...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/FJC.0b013e31829dd857
更新日期:2013-09-01 00:00:00
abstract::The adrenal medulla and pheochromocytomas are known to secrete various neuropeptides and vasoactive peptides. On the other hand, the production and secretion of peptides by adrenocortical tumors have not been studied in detail. The study reported here therefore set out to examine these two functions for two vasoactive...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200036051-00114
更新日期:2000-11-01 00:00:00
abstract::Antihypertensive medications are the most efficient drugs in achieving regression of myocardial hypertrophy in both clinical studies and animal models of hypertension. Nevertheless, there is a lack of clear and concise comparative study of their effects on the modulation of cardiomyocyte morphology and function. Here,...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/01.fjc.0000211728.23304.ad
更新日期:2006-04-01 00:00:00
abstract::We investigated the role of endothelin-A (ETA) and endothelin-B (ETB) receptors in ischemia/reperfusion-induced cardiac dysfunction and norepinephrine overflow using isolated rat hearts. According to the Langendorff technique, isolated hearts were subjected to 40 minutes of global ischemia followed by 30 minutes of re...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/01.fjc.0000166297.02819.f2
更新日期:2004-11-01 00:00:00
abstract:BACKGROUND:Factor Xa (FXa) has been a target of considerable interest for drug development efforts aimed at suppressing thrombosis. In this report, a new orally active, small molecule, active-site directed FXa inhibitor, GW813893, has been profiled in a succession of in vitro and in vivo assays involved in its preclini...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e31817e9b9e
更新日期:2008-07-01 00:00:00
abstract::The effect of two dihydropyridine derivatives, nifedipine and felodipine, on myocardial blood flow distribution 1 h after ligation of the left anterior descending coronary artery (LAD) was studied in open-chest dogs by means of radioactive microspheres. The myocardium normally perfused from the LAD was first labeled w...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198507000-00003
更新日期:1985-07-01 00:00:00
abstract::We have evaluated the effects of indoramin, an alpha-adrenoreceptor blocking drug, used as sole therapy in a group of 27 patients with essential hypertension. Blood pressure and heart rate were measured continuously over prolonged ambulatory periods using an established invasive technique before and after six weeks of...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005344-198305000-00001
更新日期:1983-05-01 00:00:00
abstract::The "Oxford" system for continuous monitoring of the ambulatory blood pressure was used to assess the changes in blood pressure following therapy with the calcium ion antagonists verapamil and nifedipine in two separate groups of patients. In the first group 16 patients were studied on both no therapy and following a ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1982-01-01 00:00:00
abstract::The exact mechanism of mechano-electrical feedback and stretch-induced arrhythmias is unknown, but the role of stretch-activated ion channels and specific calcium channels has been proposed. The aim of the present study was to test the hypothesis that stretch-activated ion channels and not calcium channels contribute ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200012000-00005
更新日期:2000-12-01 00:00:00