Abstract:
:This study examined the effects of quercetin on spontaneously contracting portal veins isolated from healthy young adult male and female Wistar rats (250-300 g). Quercetin (10(-7)-10(-4) M) always produced significant biphasic effects, comprising an initial brief stimulant effect (rise in basal tone), followed by a sustained, longer-lasting secondary relaxant (inhibitory) effect on the venous tissues. The initial brief contractions of the venous muscle preparations were not modified by preincubation of the tissues with prazosin (10(-6) M), suggesting that the initial upsurge in basal tone and increases in contractile frequencies of the venous tissues were probably not mediated via alpha1-adrenoceptor stimulation. However, preincubation of the tissues with nifedipine (10(-7) M) significantly suppressed (p < 0.05) or attenuated the initial stimulant effect of quercetin, suggesting that the flavonoid might be activating L-type voltage-dependent calcium channels. The vasorelaxant effect of quercetin was partially but not significantly (p > 0.05) inhibited by L-NAME (100 microM) or indomethacin (10 microM), suggesting that the vasorelaxant effect of the flavonoid was unlikely to be mediated via endothelium-dependent relaxing factor (EDRF), or through prostacyclin (PGI(2)) pathways. N-p-tosyl-l-phenylalanine-chloromethyl-ketone (TPCK, 3 microM) significantly (p < 0.01) antagonised quercetin-induced relaxations, suggesting that cAMP-dependent protein kinases might have contributed, at least in part, towards the vasorelaxant effect of quercetin on rat isolated portal veins.
journal_name
Cardiovasc J Afrjournal_title
Cardiovascular journal of Africaauthors
Chiwororo WD,Ojewole JAsubject
Has Abstractpub_date
2010-05-01 00:00:00pages
132-6issue
3eissn
1995-1892issn
1680-0745journal_volume
21pub_type
杂志文章abstract:INTRODUCTION:Atrial fibrillation (AF) is a relatively common arrhythmia. When AF represents an electrophysiological phenomenon in structurally normal hearts, it is termed lone AF. This study was a retrospective, case-based analysis of patients attending the Cardiac Clinic at Groote Schuur Hospital (GSH) and describes t...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2018-005
更新日期:2018-09-01 00:00:00
abstract::Takotsubo cardiomyopathy (TCMP) is characterised by a temporary aneurysm of the left ventricular apex in individuals without significant stenosis of the coronary arteries. It is extremely rare to see it combined with a thrombus. In this case report, we present a 57-year-old female patient with TCMP in whom apical thro...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2016-011
更新日期:2016-05-01 00:00:00
abstract::Cardiovascular disease (CVD) is the frontrunner in the disease spectrum of sub-Saharan Africa, with stroke and ischaemic heart disease ranked seventh and 14th as leading causes of death, respectively, on this sub-continent. Unfortunately, this region is also grappling with many communicable, maternal, neonatal and nut...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章,评审
doi:10.5830/CVJA-2016-082
更新日期:2017-07-01 00:00:00
abstract:BACKGROUND:Previous studies have shown controversial results on the role of androgens in coronary artery disease (CAD). We performed this study to assess the relationship between androgen levels and selective coronary angiography (SCA) findings. METHODS:This study was conducted on 502 consecutive men who underwent SCA...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:
更新日期:2007-11-01 00:00:00
abstract::We report on a patient who developed cardiogenic shock caused by dynamic left ventricular outflow tract (LVOT) obstruction following percutaneous coronary intervention for anteroseptal acute myocardial infarction. ...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2010-051
更新日期:2011-07-01 00:00:00
abstract::The year 2011 marks the 30th anniversary of the founding of the Pan-African Society of Cardiology (PASCAR). Throughout its brief history, PASCAR has been integral to improving the cardiovascular health of the people of Africa. During the past three decades, many African countries have been vulnerable to political and ...
journal_title:Cardiovascular journal of Africa
pub_type: 社论,历史文章
doi:
更新日期:2011-05-01 00:00:00
abstract:OBJECTIVE:To identify case fatality rates and predictors of stroke in a private clinic in Kinshasa, Democratic Republic of Congo. METHODS:Two hundred and twelve black Africans were consecutively admitted to a clinic and prospectively assessed during the first 30 days by CT scan-proven stroke types and outcome. Univari...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:
更新日期:2008-03-01 00:00:00
abstract::Behcet's syndrome is a systemic inflammatory disease associated with vasculitis, and arterial, venous and cardiac disorders. Thirty-eight Behcet's disease patients were examined prospectively with echocardiography, ultrasonography and computed tomography, and coagulation parameters were determined. Deep venous insuffi...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2014-003
更新日期:2014-03-01 00:00:00
abstract:INTRODUCTION:Rheumatic heart disease (RHD) continues to cause gross distortions of the heart and the associated complications of heart failure and thromboembolic phenomena in this age of numerous high-efficacy drugs and therapeutic interventions. Due to the lack of contemporary local data, there is no national strategy...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2012-076
更新日期:2013-03-01 00:00:00
abstract:OBJECTIVES:Few studies have evaluated young adults in their third and fourth decades with coronary artery disease (CAD). This study evaluated the clinical and angiographic profile of young adults ( < 35 years) with CAD. METHODS:A 10-year (2003-2012) retrospective chart review was performed on patients less than 35 yea...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2017-035
更新日期:2018-01-01 00:00:00
abstract:OBJECTIVE:Cardiac resynchronisation therapy has been shown to be an effective treatment to improve functional status and prolong survival of patients in advanced chronic heart failure. This study assessed the surgical outcomes of left anterior mini-thoracotomy for the implantation of left ventricular epicardial pacing ...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2016-046
更新日期:2017-01-01 00:00:00
abstract::This was a study of the pre-operative factors that influence quality of life (QoL) in patients with coronary artery disease and the relationship between pre-operative QoL and early outcome after coronary artery bypass surgery (CABG). Using the WHOQOL-BREF questionnaire, 283 patients who underwent isolated coronary art...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:
更新日期:2009-09-01 00:00:00
abstract:AIM:To determine whether a single elevated myocardial performance index (MPI) value in the third trimester of pregnancy is a marker for later adverse obstetric outcomes in stable placental-mediated disease, defined as well-controlled pre-eclampsia (PE) on a single agent and/or uncompensated intra-uterine growth restric...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2018-036
更新日期:2018-09-01 00:00:00
abstract:AIM:The aim of this study was to evaluate the effects of the sphingosine analogue, FTY720 (Fingolimod), on the outcomes of myocardial ischaemia/reperfusion (I/R) injury. METHODS:Two concentrations of FTY720 (1 or 2.5 µM were administered either prior to (PreFTY), or following (PostFTY) 20 minutes' global (GI) or 35 mi...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2016-039
更新日期:2016-11-01 00:00:00
abstract::The Fontan operation is the primary surgical technique used for palliation of patients with single-ventricle physiology. Arrhythmias are frequently observed and associated with morbidity and mortality in Fontan patients. The frequency of arrhythmias after the Fontan procedure increases over time and it was reported to...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2014-057
更新日期:2014-11-23 00:00:00
abstract:BACKGROUND:We explored the association of N-terminal probrain natriuretic peptide (NT-proBNP) with metabolic traits in a bi-ethnic African-Caucasian cohort. METHODS:Baseline examinations of the Sympathetic activity and Ambulatory Blood Pressure in African (SABPA) prospective cohort study were performed between 2008 an...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2020-017
更新日期:2020-11-01 00:00:00
abstract:BACKGROUND:Guidelines advise early angiography in non-ST elevation myocardial infarction (NSTEMI) to ensure an optimal outcome. Resource limitations in secondary hospitals in the Western Cape dictate a local guideline to treat NSTEMIs medically with out-patient assessment for angiography, unless mandatory indications f...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章,多中心研究
doi:10.5830/CVJA-2013-017
更新日期:2013-05-01 00:00:00
abstract:OBJECTIVES:Little is known about the performance of re-used pacemakers and implantable cardioverter defibrillators (ICDs) in Africa. We sought to compare the risk of infection and the rate of malfunction of re-used pacemakers and ICDs with new devices implanted at Groote Schuur Hospital in Cape Town, South Africa. MET...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2015-048
更新日期:2015-07-01 00:00:00
abstract:BACKGROUND:Rheumatoid arthritis (RA) is associated with increased cardiovascular morbidity and mortality. In the current prospective study, we addressed the impact of RA on left atrial (LA) function and electrical remodelling. Further, we tried to demonstrate the effects of infliximab, an anti-TNF-alpha agent, on echoc...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2014-036
更新日期:2014-07-01 00:00:00
abstract::The biennial Congress of the Pan-African Society of Cardiology (PASCAR) was held in Dakar from 16 to 19 May 2013 under the patronage of his Excellency, Macky Sall, president of the Republic of Senegal. This meeting was remarkable in the diversity of its 700 participants from English-, French- and Portuguese-speaking A...
journal_title:Cardiovascular journal of Africa
pub_type: 社论
doi:
更新日期:2013-06-01 00:00:00
abstract:AIM:Our aim was to evaluate whether there was a relationship between mean platelet volume and myocardial perfusion defect in diabetic patients using myocardial perfusion imaging. METHODS:Forty-four diabetic patients with myocardial perfusion defect (group 1) and 44 diabetic patients without myocardial perfusion defect...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2014-013
更新日期:2014-05-01 00:00:00
abstract:INTRODUCTION:Pulmonary thromboembolism (PTE) may increase D-dimer and decrease fibrinogen levels. However, in settings such as intensive care units (ICU) and in long-term hospitalised patients, several factors may influence D-dimer and fibrinogen concentrations and make them unreliable indicators for the diagnosis of P...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2012-041
更新日期:2012-09-01 00:00:00
abstract::Very late bare-metal stent (BMS) thrombosis is unusual in clinical practice. To the best of our knowledge, the latest that the thrombosis of a BMS has been reported is 14 years after implantation. Here, we describe a case of BMS thrombosis that occurred two decades after stenting. A 68-year-old male patient was admitt...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2015-034
更新日期:2015-07-23 00:00:00
abstract:AIM:There are few studies to be found in the literature on ankle-brachial index in sickle cell disease. The aim of this study was to compare ankle-brachial index of steadystate adult sickle cell anaemia patients with that of normal controls. METHODS:A descriptive cross-sectional study of 62 sickle cell anaemia patient...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2011-013
更新日期:2012-02-01 00:00:00
abstract::Hypertension is more prevalent and severe in urban black populations compared to whites, and is associated with a greater degree of target-organ damage for any given blood pressure level. In general, compared to whites, blacks respond well to diuretics and calcium channel blockers and less well to beta-blockers and AC...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章,评审
doi:
更新日期:2007-07-01 00:00:00
abstract:BACKGROUND:Left atrial remodelling (LAR) has been described in Western populations with chronic hypertension and is associated with a higher risk of adverse cardiovascular events. Although hypertension tends to occur earlier and is more severe in sub-Saharan Africa than in more developed nations, LAR and its associated...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2019-046
更新日期:2020-01-01 00:00:00
abstract::Heparin-induced thrombocytopenia (HIT) is a rare but potentially devastating and life-threatening complication from using heparin. HIT not only causes thrombocytopenia, but it also carries an increased risk for fatal thrombotic complications. In this report, we describe the case of a patient in whom fatal HIT develope...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2015-001
更新日期:2015-05-23 00:00:00
abstract:AIM:Although plasma NT-proBNP differentiates hypertension (HT) with or without left ventricular hypertrophy (LVH) from hypertensive heart failure (HHF), most of the published data are based on studies in Western populations. Also, most previous studies did not consider left ventricular (LV) diastolic function and right...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章
doi:10.5830/CVJA-2014-050
更新日期:2014-09-01 00:00:00
abstract:BACKGROUND:Dyslipidaemia is a major modifiable risk factor for atherosclerotic cardiovascular disease. At the time the study was conducted, guidelines recommended a low-density lipoprotein cholesterol (LDL-C) target of less than 1.8 mmol/l and a reduction of at least 50% if the baseline LDL-C was between 1.8 and 3.5 mm...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章,多中心研究
doi:10.5830/CVJA-2020-010
更新日期:2020-09-01 00:00:00
abstract::In developing countries, rheumatoid arthritis (RA) remains a seriously under-prioritised disease, particularly among the underprivileged, often resulting in presentation of patients late in the course of their disease, further complicated by limited therapeutic options and inconsistent follow up. The consequences are ...
journal_title:Cardiovascular journal of Africa
pub_type: 杂志文章,评审
doi:10.5830/CVJA-2018-018
更新日期:2018-09-01 00:00:00