Abstract:
:When the cervical vagus nerve is briefly stimulated, a triphasic cardiac chronotropic response ensues: the cardiac cycle length initially increases, then briefly decreases, and subsequently increases again. Verapamil, a calcium channel blocker, alters these responses to acetylcholine when the heart is in sinoatrial nodal rhythm. We investigated whether verapamil has a similar effect on parasympathetic modulation of the cardiac cycle when the heart is in atrioventricular rhythm. Atrioventricular rhythm was induced in anesthetized, open-chest dogs by infusion of sodium pentobarbital into the sinoatrial nodal artery. Verapamil was administered by bolus injection through a femoral vein. Verapamil accentuated the initial lengthening of the cardiac cycle by approximately 55% (from 301 to 466 ms). The acceleratory phase of this triphasic response and the secondary cardioinhibition were not significantly affected by verapamil. Thus, the initial action of acetylcholine at the atrioventricular node is potentiated by verapamil when the vagus is activated with brief stimuli.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Wallick DW,Stuesse SL,Crafford Wdoi
10.1097/00005344-198807000-00017subject
Has Abstractpub_date
1988-07-01 00:00:00pages
122-5issue
1eissn
0160-2446issn
1533-4023journal_volume
12pub_type
杂志文章abstract::The relationship between arterial pressure and the rate of Na+ excretion is regulated by a number of mechanisms- some well known, some newly discovered, and probably some yet to be discovered. These mechanisms affect either the amount of Na+ filtered at the glomerulus or its rate of reabsorption from the proximal or d...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:
更新日期:1995-01-01 00:00:00
abstract::To determine whether the pattern of alcohol consumption, intake, and withdrawal modulates the incidence of malignant ventricular arrhythmias and sudden cardiac death due to beta-adrenergic stimulation in a species susceptible to administration of isoproterenol alone, a regimen was formulated in which both continuous a...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198810000-00015
更新日期:1988-10-01 00:00:00
abstract::Sarcosyl1, cysteinyl-S-methyl8-angiotensin II [(Sar1, Cys-Me8) Ang II] was examined for antagonism of angiotensin (Ang) responses in isolated rabbit atrial and aortic tissues. (Sar1, Cys-Me8) Ang II competitively antagonized Ang II responses in aorta at a concentration of 5 nM. Concentrations of the antagonist greater...
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pub_type: 杂志文章
doi:10.1097/00005344-198311000-00017
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abstract::Baroreflex control of renin release following acute and prolonged blood pressure reduction by felodipine administration was investigated in conscious spontaneously hypertensive rats (SHR) fitted with arterial and venous catheters. Basal values of mean arterial pressure (MAP), heart rate (HR), and plasma renin activity...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1987-01-01 00:00:00
abstract::We investigated the effects of a class I antiarrhythmic drug, cibenzoline, on human atrial muscle in vivo. Electrophysiologic measurements were performed in 44 patients (mean age 49 +/- 15 years), before and after an intravenous infusion of cibenzoline 1.4 mg/kg in 5 min. Extrastimuli at a basic cycle length (BCL) of ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
doi:10.1097/00005344-199608000-00020
更新日期:1996-08-01 00:00:00
abstract::Bethanidine sulfate is a congener of bretylium tosylate, which has been reported to have antiarrhythmic and antifibrillatory effects. We studied the effects of bethanidine on transmembrane potentials recorded from canine Purkinje fibers and ventricular muscle cells, using standard microelectrode techniques. Normal Pur...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198501000-00009
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abstract::In this study we compared the antithrombotic and anticoagulant properties of sodium and calcium derivatives of pentosan polysulfate (Na-PPS, Ca-PPS), unfractionated heparin (UFH), and low-molecular-weight heparin (Fraxiparin). The antithrombotic effects of these agents have been investigated in an experimental thrombo...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199909000-00004
更新日期:1999-09-01 00:00:00
abstract::The hemodynamic effects of tetramethylpyrazine were examined in 27 anesthetized open chest dogs with electromagnetic flowmeter probes on the left circumflex coronary artery and ascending aorta. Tetramethylpyrazine, 2-15 mg/kg i.v., caused prominent systemic and coronary vasodilation, with a maximum reduction of mean a...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198509000-00005
更新日期:1985-09-01 00:00:00
abstract::We investigated the characteristics of 125I-AII binding to rat adrenal and bovine cerebellar membranes in the presence and absence of new nonpeptide angiotensin II (AII) receptor ligands. The imidazole AII ligands, DUP753 and WL19, both produced biphasic competition curves to 125I-AII binding in rat adrenal glomerulos...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199102000-00001
更新日期:1991-02-01 00:00:00
abstract::To investigate the pathophysiologic role(s) of endothelin-1 (ET-1) in pulmonary hypertension, we studied the expression of ETB-receptor mRNA in the lung and venous plasma concentrations of ET-1 in rats with monocrotaline-induced pulmonary hypertension (PH). Three weeks after s.c. injection of monocrotaline (60 mg/kg),...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199322008-00088
更新日期:1993-01-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199203000-00015
更新日期:1992-03-01 00:00:00
abstract::Bucindolol is a nonselective beta-adrenergic receptor antagonist that has additional vasodilating properties. Because some beta-adrenergic receptor antagonists such as cyanopindolol are used as 5-HT1A/5-HT1B receptor antagonists, we tested the hypothesis that bucindolol can interact with 5-HT receptors. Both in vitro ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200001000-00004
更新日期:2000-01-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198109000-00015
更新日期:1981-09-01 00:00:00
abstract::Cardiovascular medicine is based on high-technology management of end-stage disease. Preventive medicine is preferable but, before magnetic resonance (MR), there was no noninvasive, safe, repeatable method of detecting occlusive vascular disease, which accounts for more deaths than any other disease at a presymptomati...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:
更新日期:1992-01-01 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::Vascular endothelial cell (EC) wound healing was characterized on an EC-synthesized extracellular matrix (ECM) previously treated with enzymes and antibodies specific for ECM components. Using a computer-assisted video-microscope recording system capable of automatic EC recognition, we learned whether components of th...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199322004-00005
更新日期:1993-01-01 00:00:00
abstract::We compared left ventricular (LV) hemodynamics, LV muscle mass (LVMM), and LV geometry of 13 spontaneously hypertensive rats (SHRs) treated for 20 weeks with nifedipine (30 mg/kg/day) with those of 11 age-matched untreated SHRs. LVMM, LVMM related to end-diastolic volume (LVMM/EDV), LV pressure (PLV), systolic wall st...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198301000-00008
更新日期:1983-01-01 00:00:00
abstract::Serotonin, applied to helical strips of larger vessels such as coronary arteries, acts as a potent vasoconstrictor in vitro. In contrast, in vivo serotonin causes a remarkable decrease in total peripheral resistance. To differentiate the influence of serotonin on resistances of large and small vessels, experiments wer...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198500077-00017
更新日期:1985-01-01 00:00:00
abstract:SUMMARY:The present study reports the effects of apomorphine (APO) on blood pressure and the principal site of action of this agonist in 4-week deoxycorticosterone-acetate (DOCA)-hypertensive conscious rats. In these preprations, intravenous (i.v.) administration of APO (0.50-1 mg/kg) induced short-lasting and dose-dep...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200312000-00012
更新日期:2003-12-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/FJC.0000000000000728
更新日期:2019-11-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
abstract::Endothelin-1 (ET-1) causes long-lasting vasoconstriction associated with a prolonged elevation of intracellular free Ca2+. Because this may be mediated through an effect on membrane ion channels, we investigated the effects of the dihydropyridine calcium channel antagonist nifedipine; two structurally distinct K+ chan...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199322008-00041
更新日期:1993-01-01 00:00:00
abstract::The prognosis for patients with congestive heart failure (CHF) is poor, with a mortality exceeding 50% within 5 years from diagnosis. This poor prognosis remains despite improved pharmacological therapy. Because the prevalence of sudden death among these patients is high, reported to exceed 40%, the prognostic importa...
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
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199804000-00019
更新日期:1998-04-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199305000-00005
更新日期:1993-05-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/00005344-198406002-00006
更新日期:1984-01-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/00005344-198600101-00010
更新日期:1986-01-01 00:00:00
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journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005344-198812007-00022
更新日期:1988-01-01 00:00:00
abstract::The pharmacokinetics of losartan and EXP3174, an active metabolite of losartan, were evaluated in the anesthetized pig after both a single intravenous dose (3 mg/kg) and during constant intravenous infusion. The pharmacodynamic activities of losartan and EXP3174 were determined during constant intravenous infusion as ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199711000-00008
更新日期:1997-11-01 00:00:00
abstract::Experiments were carried out on isolated canine right atria to investigate the effects of N-(2-hydroxyethyl)nicotinamide nitrate (nicorandil, SG-75) and its interaction with beta-adrenoceptor stimulation on the cyclic nucleotide levels accompanying inotropic changes. The results were compared with those during muscari...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198309000-00027
更新日期:1983-09-01 00:00:00