Abstract：
:The velocity of contraction has been reported to be more rapid in left atrium (LA) than left ventricle (LV), but the mechanics of contraction in these two chambers have not been compared under physiological conditions. Accordingly, sonomicrometer crystals and solid state pressure transducers were used to measure LV and LA systolic function simultaneously in seven conscious dogs. Two sets of crystals (LA-1, LA-2) were placed perpendicularly across the LA. Phenylephrine was infused at increasing doses from 0.4 to 1.2 microgram . kg-1 . min-1 to increase LV and LA afterloads. Constant heart rates were maintained by atrial pacing. The results indicated that LA motion was virtually identical in both diameters. LA fractional shortening (0.07 +/- 0.01) and ejection time (0.057 +/- 0.002 s) were much smaller than the ventricular values (0.21 +/- 0.01 and 0.18 +/- 0.01 s, respectively). The velocity of circumferential fibre shortening (Vcf) for the LV (1.16 +/- 0.05 cir . s-1) was not significantly different from LA-1 Vcf (1.19 +/- 0.09 cir . s-1) or LA-2 Vcf (1.22 +/- 0.08 cir . s-1). During phenylephrine infusions, LV systolic pressure increased from 120.0 +/- 3.4 to 190.8 +/- 15.5 mmHg and LV end-diastolic pressure increased from 3.6 +/- 0.3 to 27.7 +/- 2.7 mmHg. When Vcf for each chamber was plotted against the peak systolic pressure in that chamber, the curve of the LA was located upward and to the right of the LV curve.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Goldman S,Olajos M,Morkin Edoi
10.1093/cvr/18.10.604subject
Has Abstractpub_date
1984-10-01 00:00:00pages
604-12issue
10eissn
0008-6363issn
1755-3245journal_volume
18pub_type
杂志文章abstract：OBJECTIVE:We investigated the influence of experimental hyperlipidemia on the formation of cardiac NO, superoxide, and peroxynitrite (ONOO(-)) in rat hearts. METHODS:Wistar rats were fed 2% cholesterol-enriched diet or normal diet for 8 weeks. Separate groups of normal and hyperlipidemic rats were injected twice intra...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(03)00330-4
更新日期：2003-06-01 00:00:00
abstract：:Exogenous angiotensin II causes noradrenaline supersensitivity in rat mesenteric vasculature preparations. The noradrenaline supersensitivity of tissues from renal/salt hypertensive rats, with low plasma renin activity, is not caused by endogenous angiotensin II since it was unaffected by Sar1 Ileu8 angiotensin II. Di...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/10.2.232
更新日期：1976-03-01 00:00:00
abstract：OBJECTIVE:To examine if adenosine prevents oxidant-induced mitochondrial dysfunction by producing nitric oxide (NO) in cardiomyocytes. METHODS AND RESULTS:Adenosine significantly enhanced the fluorescence of DAF-FM, a dye specific for NO, implying that adenosine induces synthesis of NO. Adenosine-induced NO production...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/j.cardiores.2004.12.004
更新日期：2005-03-01 00:00:00
abstract：OBJECTIVE:The purpose of this study was to assess whether the plasma levels of soluble adhesion molecules including E-selectin, intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) are elevated in patients with variant angina and whether they are released in the coronary circulation...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(97)00143-0
更新日期：1997-10-01 00:00:00
abstract：OBJECTIVES:The present study was designed to determine whether tonic nitric oxide (NO)-mediated vasodilator innervation participates in basilar arterial dilatation in the anesthetized Japanese monkey. METHODS:The basilar arterial diameter was angiographically measured, and NG-nitro-L-arginine (L-NNA), a nitric oxide s...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：
更新日期：1995-11-01 00:00:00
abstract：:The response of a simple systolic time interval, the interval between the Q wave and the onset of the aortic blood pressure pulse (the QA interval), to changes in cardiac contractility, cardiac loading, and heart rate was evaluated in anaesthetised open chest dogs. The QA interval was found to be sensitive to increase...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/20.6.444
更新日期：1986-06-01 00:00:00
abstract：:Exaggerated cardiovascular responsiveness is common in young men and may cause non-specific symptoms and poor performance. Conventional autonomic function tests are not clinically useful. We have therefore designed a thermal entrainment method to evaluate sympathetic and parasympathetic cardiovascular function in subj...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/23.3.262
更新日期：1989-03-01 00:00:00
abstract：OBJECTIVES:Prior studies have shown that the performance of the left ventricle on any one beat is influenced by the mechanical events of the previous beat, a phenomenon called "previous-beat contraction history". This previous-beat contraction history, which appears to be an interplay between the mechanical events of o...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：
更新日期：1996-07-01 00:00:00
abstract：OBJECTIVE:The aim was to test the hypothesis that in normal humans angiotensin II would stimulate local release of noradrenaline under basal conditions or during a sympathetic stimulus provided by lower body negative pressure (LBNP). METHODS:Nine healthy volunteers received intra-arterial infusions of angiotensin II, ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/28.5.663
更新日期：1994-05-01 00:00:00
abstract：:Mouse models have been frequently used in the study of Chlamydia pneumoniae (also known as Chlamydophila pneumoniae) infections. This gram-negative obligate intracellular bacterium causes respiratory infections, followed by dissemination of the bacterium to various organs throughout the body, including cardiovascular ...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1016/j.cardiores.2004.09.031
更新日期：2005-02-01 00:00:00
abstract：OBJECTIVE:Recent studies indicate that endothelial type nitric oxide synthase (NOS3) modulates cardiac systolic and diastolic function and the inotropic responsiveness to beta-adrenergic agonists, and may affect myocardial oxygen consumption. Although NOS3 is a constitutive protein, its levels of expression can be modi...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(98)00059-5
更新日期：1998-06-01 00:00:00
abstract：OBJECTIVES:Thrombin induces endothelial barrier failure by activating the contractile machinery of endothelial cells. Contractile activation is due to an increase in myosin light chain (MLC) phosphorylation. Here, it was investigated whether stimulation of endothelial cells with ATP can interrupt this thrombin-induced ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(03)00427-9
更新日期：2003-08-01 00:00:00
abstract：AIMS:in this study, we attempted to detect a recent myocardial ischaemic event using ultrasound molecular imaging (UMI) with microbubbles (MB) targeted to intercellular adhesion molecule-1 (ICAM-1) in the late phase of reperfusion. METHODS AND RESULTS:we created a myocardial ischaemia-reperfusion model in 60 C57/BL ma...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvq269
更新日期：2011-01-01 00:00:00
abstract：:The QT interval, a global index of ventricular repolarization, varies among individuals and is influenced by diverse physiologic and pathophysiologic stimuli such as gender, age, heart rate, electrolyte concentrations, concomitant cardiac disease, and other diseases such as diabetes. Many drugs produce a small but rep...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1093/cvr/cvz013
更新日期：2019-04-15 00:00:00
abstract：:Labetolol, which blocks both alpha and beta-adrenoceptors, was found to have direct actions on cardiac muscle which could themselves be antiarrhythmic. It depressed the maximum rate of depolarisation, and reduced conduction velocity, in atrial and ventricular muscle and in Purkinje cells, implying restriction of fast ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/16.5.233
更新日期：1982-05-01 00:00:00
abstract：OBJECTIVES:The state of the vasodilator systems in congestive heart failure is poorly defined. Plasma atrial natriuretic peptide is increased, whereas endothelium derived relaxing factor activity can be decreased. Atrial natriuretic peptide and endothelium derived relaxing factor both cause vascular relaxation by gener...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/27.6.1094
更新日期：1993-06-01 00:00:00
abstract：OBJECTIVES:The A10 cell line was derived from the thoracic aorta of embryonic rat and is a commonly used model of vascular smooth muscle cells (VSMC). Despite its wide use this cell line has not been well characterized. This is especially important in light of recent evidence of phenotypically distinct cell populations...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(97)00156-9
更新日期：1997-10-01 00:00:00
abstract：OBJECTIVE:The pulmonary circulation may contribute to elevated plasma levels of endothelin-1 (ET-1) in congestive heart failure (CHF). The aims of the present study were to determine the mechanisms of increased secretion of ET-1 from the pulmonary circulation in CHF. METHODS:Juvenile pigs were subjected to sham operat...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/j.cardiores.2004.03.016
更新日期：2004-07-01 00:00:00
abstract：OBJECTIVES:Epidemiological evidence in humans suggests that intrauterine growth retardation is associated with an increased risk of hypertension and coronary heart disease in later life. To begin to understand the mechanisms involved, we developed and exploited a rat model of intrauterine growth retardation to assess p...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(00)00167-x
更新日期：2000-11-01 00:00:00
abstract：:The effect on the microcirculation of long term administration of the alpha 1 blocker prazosin, which increases peripheral blood flow, was studied in skeletal muscles with differing metabolic profiles. Prazosin (50 mg.litre-1), given ad libitum for 5 weeks in the drinking water, resulted in an increase in capillarity ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/23.11.913
更新日期：1989-11-01 00:00:00
abstract：:Systemic haemodynamics and regional myocardial blood flow responses to hypertonic mannitol were studied in 10 conscious and 23 anaesthetized dogs. Mannitol infusion significantly increased regional myocardial blood flow in the conscious, intact dogs. Mannitol increased total coronary flow 20% in anasethetized animals ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/9.1.47
更新日期：1975-01-01 00:00:00
abstract：:Mayer waves are oscillations of arterial pressure occurring spontaneously in conscious subjects at a frequency lower than respiration (approximately 0.1 Hz in humans). Mayer waves are tightly coupled with synchronous oscillations of efferent sympathetic nervous activity and are almost invariably enhanced during states...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1016/j.cardiores.2005.11.008
更新日期：2006-04-01 00:00:00
abstract：OBJECTIVE:H(2)O(2) can contract many arteries, however the underlying mechanisms are not fully understood. This study aims to test whether H(2)O(2)-induced vasoconstriction could be functionally attributed to the activation of P(2)-purinoceptors in rat aorta and to explore its possible signaling mechanisms. METHODS:Is...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(00)00123-1
更新日期：2000-08-18 00:00:00
abstract：OBJECTIVES:The aim was to determine the effect and mechanisms by which myocyte stretch interacts with the prolongation of action potential duration (APD) by the class III antiarrhythmic agent E-4031. METHODS:Action potentials and whole-cell currents were measured in isolated guinea pig ventricular myocytes with a patc...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：
更新日期：1996-02-01 00:00:00
abstract：:The development of the heart is a complex process during which different cell types progressively contribute to shape a four-chambered pumping organ. Over the last decades, our understanding of the specification and transcriptional regulation of cardiac development has been greatly augmented as has our understanding o...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1093/cvr/cvr078
更新日期：2011-07-15 00:00:00
abstract：AIMS:We investigated the molecular mechanism of rapid-depolarization-induced atrial fibrosis. METHODS AND RESULTS:We used a direct atrial myocyte-fibroblast contact co-culture and a fibroblast-specific transforming growth factor β1 (TGF-β1), connective tissue growth factor (CTGF) and procollagen type I α-1 (COL1A1) lu...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvq322
更新日期：2011-03-01 00:00:00
abstract：OBJECTIVE:The aim was to study the contractility of the conduit coronary artery to vasoactive agents in developing and established volume overload cardiac hypertrophy and to compare it with structural alterations in the artery. METHODS:Aortic valve insufficiency in rabbits was used to produce a volume overloaded heart...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/27.11.2005
更新日期：1993-11-01 00:00:00
abstract：:Extracellular potassium activity before and after coronary occlusion was measured in the canine heart by means of potassium-selective surface electrodes. In the ischaemic myocardium potassium activity rapidly increased from a preocclusion value of 3.2 +/- 0.3 mmol.litre-1 to 10 +/- 0.6 mmol.litre-1 within the first 5 ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/13.5.297
更新日期：1979-05-01 00:00:00
abstract：STUDY OBJECTIVE:The aim was to evaluate the influence that centrally administered angiotensin-II has on the intrarenal renin-angiotensin system and renal sympathetic nerve activity. DESIGN:Renal responses to centrally administered angiotensin-II (10 micrograms) or saralasin (50 micrograms) were measured in anaesthetis...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/25.5.353
更新日期：1991-05-01 00:00:00
abstract：:The cardiospecificity of the MB isoenzyme of creatine kinase, EC 2.7.3.2, (CK) with its associated diagnostic and research value has resulted in the development of a number of procedures for the separation and quantitation of the three isoenzymes of CK. In our experience methods involving cellulose acetate electrophor...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/11.2.94
更新日期：1977-03-01 00:00:00
