Hysteresis of the ventricular paced QT interval in response to abrupt changes in pacing rate.

Abstract:

:The rate of QT adaptation to abrupt changes in pacing rate was studied in seven patients with newly diagnosed complete heart block with a ventricular escape rate of less than 40 beats.min-1. Their median age was 70 (range 36-84) years, and none was taking any cardioactive medication known to affect the QT interval. From a baseline pacing rate of 50 or 110 beats.min-1 the ventricular rate was increased or decreased to a new level. The time taken for the ventricular paced QT interval to complete 90% of the change secondary to the change in rate was found to be 136(16) s (mean(SEM] when the rate was increasing and 189(25) s when the rate was decreasing (p less than 0.01). This time interval was independent of the magnitude of the rate change and the baseline heart rate from which the change occurred. Furthermore, the time course of QT adaptation was found to be exponential and was characterised by a time constant of 49.1(2.2) s when the rate was increasing and 60.4(2.0) s when the rate was decreasing (p less than 0.01). It is concluded that QT measurements in response to a change in pacing rate should take into account the time dependent nature of QT changes.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Lau CP,Freedman AR,Fleming S,Malik M,Camm AJ,Ward DE

doi

10.1093/cvr/22.1.67

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

67-72

issue

1

eissn

0008-6363

issn

1755-3245

journal_volume

22

pub_type

杂志文章
  • Lazaroids and deferoxamine attenuate the intracellular effects of oxyhaemoglobin in vascular smooth muscle.

    abstract:OBJECTIVES:While it is probable that the cerebrovascular spasm which occurs after subarachnoid haemorrhage results from the action of haemoglobin, the mechanism of that process remains unclear. These studies were thus designed to test the hypothesis that the action of oxyhaemoglobin results from the iron-catalyzed form...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:

    authors: Vollrath B,Chan P,Findlay M,Cook D

    更新日期:1995-10-01 00:00:00

  • Hypoxia induces unique proliferative response in adventitial fibroblasts by activating PDGFβ receptor-JNK1 signalling.

    abstract:AIMS:Pulmonary hypertension (PH) is a devastating condition for which no disease-modifying therapies exist. PH is recognized as proliferative disease of the pulmonary artery (PA). In the experimental newborn calf model of hypoxia-induced PH, adventitial fibroblasts in the PA wall exhibit a heightened replication index....

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvs194

    authors: Panzhinskiy E,Zawada WM,Stenmark KR,Das M

    更新日期:2012-08-01 00:00:00

  • Left coronary pressure-flow relations of the beating and arrested rabbit heart at different ventricular volumes.

    abstract:OBJECTIVE:To study the effect of cardiac contraction on left coronary artery pressure-flow relations at different vascular volumes and to compare these relations in the beating heart with those in the heart arrested in systole and diastole. METHODS:Maximally vasodilated, Tyrode perfused, rabbit hearts (n = 6) with an ...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(98)00119-9

    authors: Sipkema P,Takkenberg JJ,Zeeuwe PE,Westerhof N

    更新日期:1998-10-01 00:00:00

  • Induction of oxidative stress by oxidized LDL via meprinα-activated epidermal growth factor receptor in macrophages.

    abstract:AIMS:The aim of this study was to explore meprinα-mediated transactivation of the epidermal growth factor receptor (EGFR) and reactive oxygen species (ROS) production in macrophages. METHODS AND RESULTS:Accelerated atherosclerotic lesions were established by administration of a high-fat diet in apolipoprotein E-defici...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvs369

    authors: Gao P,Wang XM,Qian DH,Qin ZX,Jin J,Xu Q,Yuan QY,Li XJ,Si LY

    更新日期:2013-03-01 00:00:00

  • Peptidyl-prolyl isomerases: a full cast of critical actors in cardiovascular diseases.

    abstract::Peptidyl-prolyl cis-trans-isomerases are a highly conserved family of immunophilins. The three peptidyl-prolyl cis-trans-isomerase subfamilies are cyclophilins, FK-506-binding proteins, and parvulins. Peptidyl-prolyl cis-trans-isomerases are expressed in multiple human tissues and regulate different cellular functions...

    journal_title:Cardiovascular research

    pub_type: 杂志文章,评审

    doi:10.1093/cvr/cvv096

    authors: Perrucci GL,Gowran A,Zanobini M,Capogrossi MC,Pompilio G,Nigro P

    更新日期:2015-06-01 00:00:00

  • A decade of genome-wide association studies for coronary artery disease: the challenges ahead.

    abstract::In this review, we summarize current knowledge on the genetics of coronary artery disease, based on 10 years of genome-wide association studies. The discoveries began with individual studies using 200K single nucleotide polymorphism arrays and progressed to large-scale collaborative efforts, involving more than a 100 ...

    journal_title:Cardiovascular research

    pub_type: 历史文章,杂志文章,评审

    doi:10.1093/cvr/cvy084

    authors: Erdmann J,Kessler T,Munoz Venegas L,Schunkert H

    更新日期:2018-07-15 00:00:00

  • Growth hormone releasing peptide (ghrelin) is synthesized and secreted by cardiomyocytes.

    abstract:OBJECTIVE:Ghrelin, the endogenous ligand of growth hormone secretagogue receptor (GHS-R), acts on the pituitary and the hypothalamus to stimulate the release of growth hormone (GH) and promotes appetite and adiposity. It has also been reported to increase myocardial contractility, induce vasodilation, and protect again...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/j.cardiores.2004.01.024

    authors: Iglesias MJ,Piñeiro R,Blanco M,Gallego R,Diéguez C,Gualillo O,González-Juanatey JR,Lago F

    更新日期:2004-06-01 00:00:00

  • Aldosterone increases T-type calcium channel expression and in vitro beating frequency in neonatal rat cardiomyocytes.

    abstract:OBJECTIVE:Although aldosterone has been implicated in the pathogenesis of cardiac hypertrophy and heart failure, its cellular mechanism of action on cardiomyocyte function is not yet completely elucidated. This study was designed to investigate the effect of aldosterone on calcium channel expression and cardiomyocyte c...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/j.cardiores.2005.05.009

    authors: Lalevée N,Rebsamen MC,Barrère-Lemaire S,Perrier E,Nargeot J,Bénitah JP,Rossier MF

    更新日期:2005-08-01 00:00:00

  • Effects of adrenaline on a compartment of slowly-exchangeable calcium in the perfused rat heart.

    abstract::The effects of adrenaline on kinetically-distinct compartments of exchangeable calcium in the spontaneously-beating perfused rat heart were investigated under steady-state conditions using a 45Ca2+ outflow technique together with a nonlinear least-squares curve fitting procedure and 51Cr-EDTA to monitor the loss of fr...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/17.2.88

    authors: Lamont SV,Barritt GJ

    更新日期:1983-02-01 00:00:00

  • Hydroxyl radical scavenging effect of nicaraven in myocardial and coronary endothelial preservation and reperfusion injury.

    abstract:OBJECTIVE:We investigated the efficacy of nicaraven in reducing myocardial as well as coronary endothelial preservation-reperfusion (P/R) injury. METHODS:In experiment I, isolated rat hearts were mounted on a Langendorff (L) apparatus to estimate the baseline cardiac function. Group 1, 8- and 12-h storage in histidine...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(96)00268-4

    authors: Alam MS,Ku K,Hashimoto M,Nosaka S,Saitoh Y,Yamauchi M,Masumura S,Nakayama K,Tamura K

    更新日期:1997-03-01 00:00:00

  • Effect of angiotensin II on noradrenaline release in the human forearm.

    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

    authors: Goldsmith SR,Rector TS,Bank AJ,Garr M,Kubo SH

    更新日期:1994-05-01 00:00:00

  • Dyslipidemia and endothelium-dependent relaxation in internal mammary arteries used for coronary bypass surgery.

    abstract:OBJECTIVE:Impairment of endothelium-dependent relaxation is related to dyslipidemia and may be an early marker for atherosclerosis in angiographically smooth arteries. The aim of the present study was to relate preoperative serum lipids to endothelium-dependent relaxation in internal mammary arteries of patients underg...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(97)00081-3

    authors: Voors AA,Oosterga M,Buikema H,May JF,Grandjean JG,van Buiten A,van Gilst WH

    更新日期:1997-06-01 00:00:00

  • Temporal effects of prolonged hypoxaemia and reoxygenation on systemic, pulmonary and mesenteric perfusions in newborn piglets.

    abstract:OBJECTIVE:Temporal effects of prolonged hypoxaemia and reoxygenation, on the systemic pulmonary and mesenteric circulations in newborn piglets, were investigated. METHODS:Two groups [control (n = 5), hypoxaemic (n = 7)] of 1-3 day old anaesthetised piglets were instrumented with ultrasound flow probes placed to measur...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(98)00080-7

    authors: Cheung PY,Barrington KJ,Bigam DL

    更新日期:1998-08-01 00:00:00

  • Relation between monophasic action potential duration, ST segment elevation, and regional myocardial blood flow after coronary occlusion in the pig.

    abstract::There is mounting interest in the use of the monophasic action potential for electrophysiological investigation of regional myocardial ischaemia. There is, however, no systematic study of the relation between the changes in monophasic action potential and regional myocardial blood flow. In this study monophasic action...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/20.10.740

    authors: Kingaby RO,Lab MJ,Cole AW,Palmer TN

    更新日期:1986-10-01 00:00:00

  • Differential effects of lignocaine and hypercalcaemia on anisotropic conduction and reentry in the ischaemically damaged canine ventricle.

    abstract:OBJECTIVE:Anisotropic conduction characteristics, which may be expressed as the ratio of conduction velocities in the longitudinal (Vlong) and transverse (Vtrans) fibre directions, have been shown to stabilise reentry and favour the induction of sustained, uniform ventricular tachycardia. The aim of this study was to i...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(96)88593-2

    authors: Hélie F,Cossette J,Vermeulen M,Cardinal R

    更新日期:1995-03-01 00:00:00

  • Mitochondrial nitroalkene formation and mild uncoupling in ischaemic preconditioning: implications for cardioprotection.

    abstract:AIMS:Both mitochondria and nitric oxide (NO*) contribute to cardioprotection by ischaemic preconditioning (IPC). IPC causes mild uncoupling of mitochondria via uncoupling proteins (UCPs) and the adenine nucleotide translocase (ANT), and mild uncoupling per se is cardioprotective. Although electrophilic lipids are known...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvn323

    authors: Nadtochiy SM,Baker PR,Freeman BA,Brookes PS

    更新日期:2009-05-01 00:00:00

  • Hsp70 protects from stroke in atrial fibrillation patients by preventing thrombosis without increased bleeding risk.

    abstract:AIMS:Atrial fibrillation (AF) is a major risk factor for cardio-embolic stroke. Anticoagulant drugs are effective in preventing AF-related stroke. However, the high frequency of anticoagulant-associated major bleeding is a major concern. This study sought to identify new targets to develop safer antithrombotic therapie...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvw049

    authors: Allende M,Molina E,Guruceaga E,Tamayo I,González-Porras JR,Gonzalez-López TJ,Toledo E,Rabal O,Ugarte A,Roldán V,Rivera J,Oyarzabal J,Montes R,Hermida J

    更新日期:2016-06-01 00:00:00

  • Intra-uterine growth retardation results in increased cardiac arrhythmias and raised diastolic blood pressure in adult rats.

    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

    authors: Hu XW,Levy A,Hart EJ,Nolan LA,Dalton GR,Levi AJ

    更新日期:2000-11-01 00:00:00

  • Antiarrhythmic and electrophysiological effects of amiodarone, lignocaine, and penticainide in anaesthetised rats.

    abstract:OBJECTIVE:The aim was to correlate the relative abilities of amiodarone, lignocaine, and penticainide in suppressing ventricular tachyarrhythmias in response to coronary artery occlusion with their relative abilities to prolong ventricular functional refractory periods and to reduce intraventricular conduction velociti...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/26.11.1116

    authors: Li JY,Northover BJ

    更新日期:1992-11-01 00:00:00

  • An increase in afterload augments ventricular relaxation rate in isolated perfused canine hearts.

    abstract::The afterload dependency of relaxation rate was reappraised in isolated canine hearts both in isovolumic and isobaric contractions by using the reliable exponential method in which the asymptote LV pressure (P chi) is variable. This method provided a closer correlation (r = 0.999 +/- 0.001) between the measured LV pre...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/19.10.649

    authors: Hori M,Inoue M,Fukunami M,Kitakaze M,Ishida Y,Tsujioka K,Nakajima S,Kitabatake A,Abe H

    更新日期:1985-10-01 00:00:00

  • Congenital coronary artery anomalies: a bridge from embryology to anatomy and pathophysiology--a position statement of the development, anatomy, and pathology ESC Working Group.

    abstract::Congenital coronary artery anomalies are of major significance in clinical cardiology and cardiac surgery due to their association with myocardial ischaemia and sudden death. Such anomalies are detectable by imaging modalities and, according to various definitions, their prevalence ranges from 0.21 to 5.79%. This cons...

    journal_title:Cardiovascular research

    pub_type: 杂志文章,评审

    doi:10.1093/cvr/cvv251

    authors: Pérez-Pomares JM,de la Pompa JL,Franco D,Henderson D,Ho SY,Houyel L,Kelly RG,Sedmera D,Sheppard M,Sperling S,Thiene G,van den Hoff M,Basso C

    更新日期:2016-02-01 00:00:00

  • Adenovirus-mediated expression of p35 prevents hypoxia/reoxygenation injury by reducing reactive oxygen species and caspase activity.

    abstract:OBJECTIVE:This study aimed to examine the effects of adenovirus-mediated expression of p35, a baculovirus gene, on apoptosis induced by hypoxia/reoxygenation (H/R) in cardiomyocytes. METHODS:Neonatal rat cardiomyocytes were infected with recombinant adenoviral vectors expressing p35 (Ad2/CMVp35) or no transgene (Ad2/C...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(02)00412-1

    authors: Date T,Belanger AJ,Mochizuki S,Sullivan JA,Liu LX,Scaria A,Cheng SH,Gregory RJ,Jiang C

    更新日期:2002-08-01 00:00:00

  • A pyrrole-imidazole polyamide targeting transforming growth factor-beta1 inhibits restenosis and preserves endothelialization in the injured artery.

    abstract:AIMS:Although the use of drug-eluting stents (DESs) has been shown to limit neointima hyperplasia, currently available DESs may adversely affect re-endothelialization. To evaluate whether a novel gene silencer pyrrole-imidazole (PI) polyamide targeting transforming growth factor (TGF)-beta1 is a candidate agent for the...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvn355

    authors: Yao EH,Fukuda N,Ueno T,Matsuda H,Nagase H,Matsumoto Y,Sugiyama H,Matsumoto K

    更新日期:2009-03-01 00:00:00

  • Organotypic slice culture from human adult ventricular myocardium.

    abstract:AIMS:Cardiovascular research requires complex and functionally intact experimental models. Due to major differences in the cellular and subcellular composition of the myocardium between species, the use of human heart tissue is highly desirable. To enhance the experimental use of the human myocardium, we established me...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/cvr259

    authors: Brandenburger M,Wenzel J,Bogdan R,Richardt D,Nguemo F,Reppel M,Hescheler J,Terlau H,Dendorfer A

    更新日期:2012-01-01 00:00:00

  • Aldosterone specific membrane receptors, rapid activation of the sodium-hydrogen exchanger, and cardiovascular implications.

    abstract::Functional studies in extrarenal non-epithelial cells such as smooth muscle cells and easily accessible human lymphocytes have demonstrated that aldosterone not only produces classical genomic effects, but also rapid non-genomic effects on transmembrane electrolyte movements. These involve the activation of the Na+/H+...

    journal_title:Cardiovascular research

    pub_type: 杂志文章,评审

    doi:

    authors: Wehling M

    更新日期:1995-02-01 00:00:00

  • Cardioprotective effects of platelets against ischaemia-reperfusion injury are related in part to platelet glutathione redox cycle.

    abstract:OBJECTIVE:Washed platelets have been shown to protect isolated buffer perfused rat hearts from injury and dysfunction following ischaemia-reperfusion. This study was designed to investigate whether platelet glutathione redox cycle contributes to the protective effect of platelets. METHODS:Isolated rat hearts were perf...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/28.10.1586

    authors: Yang BC,Mehta A,Mehta JL

    更新日期:1994-10-01 00:00:00

  • Sarcoplasmic reticulum Ca2+-ATPase modulates cardiac contraction and relaxation.

    abstract::The cardiac SR Ca(2+)-ATPase (SERCA2a) regulates intracellular Ca(2+)-handling and thus, plays a crucial role in initiating cardiac contraction and relaxation. SERCA2a may be modulated through its accessory phosphoprotein phospholamban or by direct phosphorylation through Ca(2+)/calmodulin dependent protein kinase II ...

    journal_title:Cardiovascular research

    pub_type: 杂志文章,评审

    doi:10.1016/s0008-6363(02)00694-6

    authors: Frank KF,Bölck B,Erdmann E,Schwinger RH

    更新日期:2003-01-01 00:00:00

  • Cardiac depression after experimental air embolism in pigs: role of addition of a surface-active agent.

    abstract:OBJECTIVE:Air bubbles entering the coronary artery may have harmful effects on cardiac function. From the physical point of view it is the relatively high surface tension of the blood-air interface which causes bubbles to trap in small vessels. The aim of the present study was to reduce depression of myocardial functio...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1016/s0008-6363(97)00063-1

    authors: van Blankenstein JH,Slager CJ,Soei LK,Boersma H,Stijnen T,Schuurbiers JC,Krams R,Lachmann B,Verdouw PD

    更新日期:1997-06-01 00:00:00

  • Relationship between lactate arteriovenous gradient and tissue lactate content in subendocardial and subepicardial layers of the ischaemic in situ heart.

    abstract::Myocardial lactate content and simultaneous evolution of a lactate arteriovenous gradient associated with incomplete obstruction of the left coronary bed were studied in dog hearts. Samples of blood were taken from a peripheral artery and the coronary sinus; transmural samples of myocardial tissue were obtained from t...

    journal_title:Cardiovascular research

    pub_type: 杂志文章

    doi:10.1093/cvr/16.10.552

    authors: Al Makdessi S,Andrieu JL,Chah QT,Tuduri AJ,Faucon G

    更新日期:1982-10-01 00:00:00

  • Sense and stretchability: the role of titin and titin-associated proteins in myocardial stress-sensing and mechanical dysfunction.

    abstract::Mechanical stress signals transmitted through the heart walls during hemodynamic loading are sensed by the myocytes, which respond with changes in contractile performance and gene expression. External forces play an important role in physiological heart development and hypertrophy, but disruption of the well-balanced ...

    journal_title:Cardiovascular research

    pub_type: 杂志文章,评审

    doi:10.1016/j.cardiores.2007.03.029

    authors: Linke WA

    更新日期:2008-03-01 00:00:00