Abstract:
:The P and the Ta waves of two patient groups with A-V block were magnified with a direct-current amplifier and recorded at a high paper speed. In Group A patients (those without serious cardiovascular complications except A-V block) the P and the Ta waves were recorded in the opposite direction in every lead and there was a linear relationship between the amplitude of the P and the Ta waves. The atrial gradient was nearly zero. There existed a positive correlation between the P + Ta time and the P-P interval. In Group B patients (those with serious cardiovascular complications besides A-V block) there were significant differences in the Ta wave from Group A with respect to form, polarity, amplitude, duration, and the relationship between the Ta and the P waves. The atrial gradient was markedly large. Careful attention should be paid to the deviation of the PQ segment caused by the Ta wave in daily ECG's to detect atrial abnormalities. The Ta wave extends into the ST segment and, while describing the deviation of the ST segment, the influence of the Ta wave should be kept in mind.
journal_name
Am Heart Jjournal_title
American heart journalauthors
Hayashi H,Okajima M,Yamada Kdoi
10.1016/s0002-8703(76)80533-9subject
Has Abstractpub_date
1976-06-01 00:00:00pages
689-98issue
6eissn
0002-8703issn
1097-6744pii
S0002-8703(76)80533-9journal_volume
91pub_type
杂志文章abstract:BACKGROUND:The pulmonary venous flow signal measured by transesophageal echocardiography is generally recorded from the left upper pulmonary vein in the left lateral decubitus position, whereas that by transthoracic echocardiography is from the right upper pulmonary vein in the left semi-lateral decubitus position. The...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(99)70486-2
更新日期:1999-03-01 00:00:00
abstract::Controlled-release drug delivery technology has had a significant effect on the pharmacotherapy of cardiovascular diseases. Oral and transcutaneous controlled-release systems allow relatively short-acting drugs to be administered once or twice daily with comparable therapeutic efficacy and fewer adverse reactions comp...
journal_title:American heart journal
pub_type: 杂志文章,评审
doi:10.1016/0002-8703(95)90019-5
更新日期:1995-02-01 00:00:00
abstract:BACKGROUND:Selenium is a central determinant of antioxidative glutathione peroxidase 1 (GPx-1) expression and activity. The relevance of selenium supplementation on GPx-1 in coronary artery disease (CAD) needs to be established. We assessed the effect of selenium supplementation on GPx-1 in cell culture and on endothel...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2008.09.004
更新日期:2008-12-01 00:00:00
abstract::Symptoms of myocardial ischemia, such as chest pain (sometimes with anginal features), acute myocardial infarction, and segmental wall motion abnormalities (including left ventricular apical aneurysm), frequently occur in patients with Chagas' heart disease. Because these clinical findings occur in the presence of nor...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(95)90122-1
更新日期:1995-05-01 00:00:00
abstract:BACKGROUND:The study evaluates whether Optison used during dobutamine stress echocardiography (DSE) will improve endocardial border definition and whether this will translate to an improvement in sensitivity and specificity of the test in patients with poor echocardiographic windows. DSE is extremely valuable in the wo...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2001.117608
更新日期:2001-11-01 00:00:00
abstract::Fatal myocardial infarction occurring in a neonate is reported. The patient presented with a clinical picture of cardiogenic shock simulating a hypoplastic left heart syndrome. Etiology of the myocardial infarction is uncertain for the coronary arteries were patent, anatomically and histologically normal, and there wa...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(75)90052-6
更新日期:1975-02-01 00:00:00
abstract:BACKGROUND:The favorable effects of lowering low-density lipoprotein (LDL)-cholesterol on reducing clinical events in patients with coronary disease have been well established. The mechanisms responsible for this benefit, however, have not been fully understood. This study examined the impact of lipid-lowering therapy ...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s0002-8703(00)90057-7
更新日期:2000-04-01 00:00:00
abstract::The effectiveness of postextrasystolic potentiation (PESP) was assessed to detect residual function of the left ventricle in seven patients with idiopathic dilated cardiomyopathy (IDC). The postextrasystolic changes in the aortic pressure pulse, global left ventricular function, and quantitative regional left ventricu...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(87)90661-2
更新日期:1987-06-01 00:00:00
abstract:BACKGROUND:Vein graft failure is a crucial challenge in coronary artery bypass graft (CABG) surgery. Previous studies have suggested a patency benefit of the No-Touch vein harvesting technique, but only with small sample sizes. MATERIALS AND METHODS:This study is a prospective, multicenter randomized clinical trial wi...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2018.11.011
更新日期:2019-04-01 00:00:00
abstract::Changes in conduction times induced by ischemia (delta CT) have been shown to be quantitatively related to genesis of spontaneous ischemic ventricular fibrillation (VF). We studied conduction delay encountered by premature impulses in epicardium and endocardium in both anterograde and retrograde directions during isch...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(81)90308-2
更新日期:1981-09-01 00:00:00
abstract:BACKGROUND:The long-term prognostic significance of early (<48 hours) ventricular fibrillation (VF) or sustained ventricular tachycardia (VT) in patients with an acute myocardial infarction remains controversial. Emerging data suggest that some of the benefit of renin-angiotensin-aldosterone system (RAAS) antagonism ma...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2009.05.023
更新日期:2009-08-01 00:00:00
abstract::Valve area and cardiac output were determined with magnetic resonance (MR) velocity mapping in 12 patients with aortic stenosis. Heart catheterization, Doppler echocardiography, and indicator dilution were performed for comparison. Left ventricle could be catheterized in only nine patients; in these cases, MR measured...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(93)90669-z
更新日期:1993-11-01 00:00:00
abstract:BACKGROUND:Ibutilide is indicated for the acute termination of atrial fibrillation and atrial flutter. Recent work concludes that ibutilide activates a late inward sodium current that is blocked by nifedipine. Because calcium channel blockers are commonly used in patients with atrial fibrillation, it is important to ex...
journal_title:American heart journal
pub_type: 杂志文章,meta分析
doi:10.1067/mhj.2002.120156
更新日期:2002-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:The pathogenesis of human coronary artery disease (CAD) is likely to require the transcription of many different genes. We report here the differential gene expression profiling of human CAD using copy DNA (cDNA)/nylon array hybridization techniques. METHODS AND RESULTS:Human coronary arteries...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2004.10.025
更新日期:2005-09-01 00:00:00
abstract:BACKGROUND:Understanding pulmonary vein (PV) anatomy is important for the planning and execution of PV isolation for the treatment of atrial fibrillation, screening for PV stenosis after the procedure, and investigating the pathophysiology of atrial fibrillation. We hypothesized that significant changes in PV size occu...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2006.05.018
更新日期:2006-11-01 00:00:00
abstract:BACKGROUND:The treatment of cocaine-related acute coronary syndromes presents unique challenges. Although percutaneous coronary intervention in cocaine abusers appears to be safe in the short term, longer-term outcomes have not been reported. We postulated that cocaine use would be associated with increased risk for st...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2007.04.004
更新日期:2007-07-01 00:00:00
abstract:BACKGROUND:Depressive symptoms in patients with heart failure (HF) are common and might be associated with inflammation. No studies have examined both the cross-sectional and prospective association between inflammation and depressive symptoms in patients with HF with adequate correction for disease severity. The aim o...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2011.03.011
更新日期:2011-06-01 00:00:00
abstract::Programmed ventricular stimulation with a standard protocol that used up to three extrastimuli was compared prospectively with a short-to-long protocol and a two-site protocol in 77 consecutive patients undergoing electrophysiologic study in an attempt to increase the yield of ventricular tachycardia (VT) induction. T...
journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0002-8703(91)90957-j
更新日期:1991-01-01 00:00:00
abstract::Therapeutics involves the careful balance between treatment disadvantages and advantages--the so-called risk-benefit ratio. Even after 20 years beta-blockers must be selected carefully to suit the patient's needs. This review examines several problems associated with beta-blockade. Generally, beta1-cardioselectivity i...
journal_title:American heart journal
pub_type: 杂志文章,评审
doi:10.1016/0002-8703(88)90130-5
更新日期:1988-11-01 00:00:00
abstract::The results of percutaneous transluminal coronary angioplasty (PTCA) in 307 lesions in 235 patients within 60 days of myocardial infarction (MI) were compared with the PTCA results in 591 lesions in 489 patients without recent MI, and the effect of fibrinolysis to treat recurring occlusive clot during angioplasty was ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(90)90065-6
更新日期:1990-08-01 00:00:00
abstract:BACKGROUND:Pulmonary vein antrum isolation (PVI) as a treatment of paroxysmal atrial fibrillation (AF) is associated with a high rate of success; however, outcomes for treating persistent and long-standing persistent AF with PVI alone are substantially lower and often require multiple procedures to maintain long-term f...
journal_title:American heart journal
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1016/j.ahj.2015.09.019
更新日期:2015-12-01 00:00:00
abstract:BACKGROUND:The diagnosis of angina is challenging because it relies on symptom descriptions. Natural language processing (NLP) of the electronic medical record (EMR) can provide access to such information contained in free text that may not be fully captured by conventional diagnostic coding. OBJECTIVE:To test the hyp...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2006.12.022
更新日期:2007-04-01 00:00:00
abstract:BACKGROUND:Cell adhesion molecules are key regulators of atherosclerotic plaque development, but circulating levels of soluble fragments, such as intercellular adhesion molecule (sICAM-1) and vascular cell adhesion molecule (sVCAM-1), have yielded conflicting associations with atherosclerotic cardiovascular disease (AS...
journal_title:American heart journal
pub_type: 杂志文章,多中心研究
doi:10.1016/j.ahj.2017.06.008
更新日期:2017-09-01 00:00:00
abstract:BACKGROUND:Prior studies have reported race and sex differences in cardiac catheterization use after acute myocardial infarction (AMI). It is unclear whether race or sex differences in procedure refusal may contribute to this difference. We sought to determine whether cardiac catheterization refusal rates differ by pat...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2002.126122
更新日期:2002-12-01 00:00:00
abstract::The aim of this study was to investigate whether platelet-activating factor (PAF), PAF receptors, and PAF receptor-mediated effects in the human myocardium play a role in cardiac depression during anaphylaxis or septic shock. The effects of PAF, the biologically inactive derivative lyso-PAF, and the specific PAF antag...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(92)90593-k
更新日期:1992-08-01 00:00:00
abstract:BACKGROUND:Chronic periodontal infection is associated with an increased risk of coronary heart disease. Although the mechanism responsible for the relationship between periodontal disease and cardiovascular events is not fully understood, it is hypothesized that the chronic inflammatory burden of periodontal disease m...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2005.10.002
更新日期:2006-01-01 00:00:00
abstract:BACKGROUND:Renal function significantly impacts morbidity and mortality after a percutaneous coronary intervention. Platelet glycoprotein (GP) IIb/IIIa inhibitors reduce ischemic complications during percutaneous coronary intervention; little is known of whether their safety and efficacy are influenced by renal functio...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2004.12.002
更新日期:2005-05-01 00:00:00
abstract:BACKGROUND:The transmission of 12-lead electrocardiograms from remote locations to hand-held computers of cardiologists is now possible with the development of wireless technology and computer software. This investigation determined whether the cardiologist's decisions regarding reperfusion therapy for patients with sy...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2000.110288
更新日期:2000-11-01 00:00:00
abstract:OBJECTIVE:We perform a systematic review to discern if ST resolution achieved via percutaneous coronary intervention (PCI) has a different meaning to that achieved via fibrinolysis. BACKGROUND:Resolution of ST-segment elevation in acute myocardial infarction has been widely used as a surrogate for treatment success. A...
journal_title:American heart journal
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.ahj.2010.06.050
更新日期:2010-11-01 00:00:00
abstract::Oxygen has long been assumed beneficial for all ill and injured patients. However, hyperoxia may be harmful and aggravate myocardial injury such as that caused by myocardial infarction. We aimed to investigate if hyperoxia increases myocardial injury following direct current cardioversion compared with room air. METH...
journal_title:American heart journal
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.ahj.2017.10.006
更新日期:2018-02-01 00:00:00