Abstract:
:Syncope is a common clinical problem characterized by transient, spontaneously self-terminating loss of consciousness with complete and prompt recovery; the cause is insufficiency of cerebral oxygen/nutrient supply most often due to a transient fall of systemic arterial pressure to levels below those tolerated by cerebrovascular autoregulation. Careful and thorough evaluation of the cause of syncope is warranted in all patients. Determining that certain individuals are at "low mortality risk" is inadequate; syncope, although often benign from a mortality perspective, tends to recur, is associated with risk of physical injury, diminishes quality-of-life, and might lead to restriction from employment or avocation. However, the diagnostic evaluation and treatment of syncope is challenging for many reasons. First, syncope is only 1 of many causes of transient loss of consciousness. Second, the patient's symptoms are fleeting, and the patient is generally fully recovered when seen in the clinic; only infrequently are there helpful physical findings. Third, spontaneous events are often unwitnessed by medical professionals; consequently, the medical history of symptom events is usually a "second-hand" or "third-hand" story. Finally, there is often an excessive sense of diagnostic "urgency" that tends to result in a rush to undertake multiple poorly considered "diagnostic" testing procedures; a deliberate approach based on initial risk stratification is more likely to reap the dual rewards of a correct diagnosis and initiation of effective treatment in a cost-effective manner.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Benditt DG,Nguyen JTdoi
10.1016/j.jacc.2008.12.065subject
Has Abstractpub_date
2009-05-12 00:00:00pages
1741-51issue
19eissn
0735-1097issn
1558-3597pii
S0735-1097(09)00588-9journal_volume
53pub_type
杂志文章,评审abstract:OBJECTIVES:We assessed the impact of serum cholesterol level in early midlife on total mortality during up to 39 years of follow-up and on the quality of life (QoL) in old age. BACKGROUND:Total effects of low serum cholesterol on health have been in dispute, especially in elderly persons, and there are few data on the...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2004.04.057
更新日期:2004-09-01 00:00:00
abstract::Acquired immunodeficiency syndrome (AIDS) has become an increasingly important health problem worldwide. This review focuses on its cardiac complications. The key elements in the clinical syndrome are the opportunistic infections and the cancer that occur as a by-product of the immunodeficiency process. However, as ea...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
doi:10.1016/0735-1097(89)90277-5
更新日期:1989-04-01 00:00:00
abstract:OBJECTIVES:Our objective was to evaluate the efficacy of triphasic waveforms for transthoracic defibrillation in a swine model. BACKGROUND:Triphasic shocks have been found to cause less post-shock dysfunction than biphasic shocks in chick embryo studies. METHODS:After 30 s of electrically induced ventricular fibrilla...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(03)00656-9
更新日期:2003-08-06 00:00:00
abstract:OBJECTIVES:Using both in vitro and in vivo techniques, we investigated the extent to which cardiac motion alters Doppler-measured blood flow velocity and thus potentially can alter the calculation of valve areas or pressure gradients. BACKGROUND:Blood flow velocity measured by Doppler ultrasound represents the net mot...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(93)90843-p
更新日期:1993-07-01 00:00:00
abstract:OBJECTIVES:We sought to evaluate the mechanisms by which nonsurgical septal reduction therapy (NSRT) reduces left ventricular outflow tract (LVOT) obstruction in patients with hypertrophic obstructive cardiomyopathy (HOCM) both acutely and on a long-term basis. BACKGROUND:NSRT reduces LVOT obstruction in patients with...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(00)01045-7
更新日期:2001-01-01 00:00:00
abstract:OBJECTIVES:This study attempted to evaluate the effects of supine and lateral recumbent positions on pulmonary venous flow by transesophageal Doppler echocardiography in healthy subjects. BACKGROUND:Although transesophageal echocardiographic examination is usually performed with the patient lying in the left lateral d...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(94)90154-6
更新日期:1994-11-15 00:00:00
abstract:OBJECTIVES:Our aim was to clarify the anatomic substrate in hearts diagnosed as having tricuspid atresia by studying autopsy specimens and comparing the findings with those in two-dimensional echocardiograms. BACKGROUND:Traditionally, tricuspid atresia was thought, and is still believed by some, to be due to an imperf...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(95)00250-8
更新日期:1995-09-01 00:00:00
abstract::Hypertension accounts for 1 in 5 deaths among American women, posing a greater burden for women than men, and is among their most important risk factors for death and development of cardiovascular and other diseases. Hypertension affects women in all phases of life, with specific characteristics relating to risk facto...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.jacc.2018.02.033
更新日期:2018-04-24 00:00:00
abstract::The purpose of this study was to examine whether remodeling of the aorta takes place after successful balloon angioplasty of aortic coarctation. During the 35 month period ending in December 1987, 30 children, aged 14 days to 13 years, underwent balloon angioplasty of unoperated aortic coarctation, with a resultant re...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(89)90434-8
更新日期:1989-11-01 00:00:00
abstract:OBJECTIVES:We sought to examine the characteristics, quality of care, and clinical outcomes for a large cohort of African-American patients hospitalized with heart failure (HF) in centers participating in a quality improvement initiative. BACKGROUND:Heart failure in African Americans is characterized by variations in ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2008.01.028
更新日期:2008-04-29 00:00:00
abstract:OBJECTIVES:We conducted a prospective multicenter registry in a large metropolitan area to define the clinical characteristics, hospital course, treatment, and factors precipitating decompensation in patients hospitalized for heart failure with a normal ejection fraction (HFNEF). BACKGROUND:The clinical profile of pat...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,多中心研究
doi:10.1016/j.jacc.2003.11.040
更新日期:2004-04-21 00:00:00
abstract:OBJECTIVES:We evaluated metallothionein (MT)-mediated cardioprotection from angiotensin II (Ang II)-induced pathologic remodeling with and without underlying diabetes. BACKGROUND:Cardiac-specific metallothionein-overexpressing transgenic (MT-TG) mice are resistant to diabetic cardiomyopathy largely because of the anti...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2008.05.019
更新日期:2008-08-19 00:00:00
abstract:OBJECTIVES:The purpose of this study was to determine the time course of the appearance of abnormal Q waves on the electrocardiogram (ECG) over the first 6 h of symptoms of myocardial infarction and to determine what implications, if any, such Q waves have for the efficacy of thrombolytic therapy. BACKGROUND:Severe my...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0735-1097(94)00514-q
更新日期:1995-04-01 00:00:00
abstract::For 40 years the American College of Cardiology has been a responsible organization in promoting the art and science of cardiac care for people of all ages. This review chronicles the leapfrogging of medical and surgical creativity and contributions to saving lives and making those lives healthy through informed care ...
journal_title:Journal of the American College of Cardiology
pub_type: 历史文章,杂志文章,评审
doi:10.1016/0735-1097(89)90332-x
更新日期:1989-06-01 00:00:00
abstract::While acute myocardial infarction mortality declines, patients continue to face reinfarction and/or heart failure. The immune system, which intimately interacts with healthy and diseased tissues through resident and recruited leukocytes, is a central interface for a global host response to ischemia. Pathways that enha...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.jacc.2015.02.034
更新日期:2015-04-21 00:00:00
abstract::A definite diagnosis of anterior myocardial infarction is often difficult to make in patients when a pattern of poor R wave progression in the precordial leads is present on the electrocardiogram. The purpose of this study was to determine whether a mathematical model could be devised to identify patients with anterio...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(83)80332-5
更新日期:1983-12-01 00:00:00
abstract:OBJECTIVES:We sought to establish the diagnostic accuracy of transesophageal echocardiography (TEE) during cardiopulmonary resuscitation. BACKGROUND:Because of its bedside diagnostic capabilities, excellent cardiac images and lack of interference with resuscitation efforts, TEE is ideally suited to determine the cause...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章
doi:10.1016/s0735-1097(97)00218-0
更新日期:1997-09-01 00:00:00
abstract:OBJECTIVES:The objective was to assess the prevalence of subclavian artery stenosis (SS) in four cohorts (two free-living and two clinical populations) and determine both risk factors for this condition and the association with other cardiovascular conditions. BACKGROUND:The prevalence of SS in the general population ...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,meta分析
doi:10.1016/j.jacc.2004.04.044
更新日期:2004-08-04 00:00:00
abstract:OBJECTIVES:The aim of this study was to determine which combination therapy in patients with hypertension and diabetes most effectively decreases cardiovascular events. BACKGROUND:The ACCOMPLISH (Avoiding Cardiovascular Events Through COMbination Therapy in Patients Living With Systolic Hypertension) trial compared th...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.jacc.2010.02.046
更新日期:2010-06-29 00:00:00
abstract:OBJECTIVES:This study characterizes the histology of myocardium predicted to be hibernating using three different imaging techniques to explain the discordance among them. BACKGROUND:Both radionuclide and functional imaging techniques were used to assess myocardial hibernation. The former have high sensitivity and the...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(01)01766-1
更新日期:2002-02-06 00:00:00
abstract::Twenty patients with a chronic total coronary artery occlusion were studied before and 1 to 48 months (mean 9) after successful recanalization by angioplasty and compared with a group of 20 normal subjects. Before angioplasty, 19 of these 20 patients had angina. Collateral vessels to the distal part of the occluded ve...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(87)80230-9
更新日期:1987-04-01 00:00:00
abstract::A prehospital computer-interpreted electrocardiogram (ECG) was obtained in 1,189 patients with chest pain of suspected cardiac origin during an ongoing trial of prehospital thrombolytic therapy in acute myocardial infarction. Electrocardiograms were performed by paramedics 1.5 +/- 1.2 h after the onset of symptoms. Of...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章
doi:10.1016/0735-1097(91)90636-n
更新日期:1991-06-01 00:00:00
abstract:OBJECTIVES:The purpose of this study is to determine if implantable cardioverter-defibrillator (ICD) implantation should be limited to physicians with high procedural volume. BACKGROUND:Expanding indications for ICDs will result in an increasing number of physicians implanting these devices. METHODS:Using the 20% Par...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2005.04.063
更新日期:2005-10-18 00:00:00
abstract::Several studies in the prethrombolytic era on the treatment of acute myocardial infarction identified selected variables from the patient's history, physical examination, chest roentgenogram and electrocardiogram that could be used to estimate mortality in patients with evolving infarction. To extend such assessment t...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(90)90579-e
更新日期:1990-08-01 00:00:00
abstract:OBJECTIVES:In a computed tomographic (CT) angiography study, we identified the characteristics of atherosclerotic lesions that were associated with subsequent development of acute coronary syndrome (ACS). BACKGROUND:The CT characteristics of culprit lesions in ACS include positive vessel remodeling (PR) and low-attenu...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2009.02.068
更新日期:2009-06-30 00:00:00
abstract:OBJECTIVES:We sought to compare standard lower extremity vascular laboratory treadmill exercise with the office-based active pedal plantarflexion technique. BACKGROUND:Intermittent claudication is relatively common in elderly patients and is an important predictor of cardiovascular morbidity and mortality. Noninvasive...
journal_title:Journal of the American College of Cardiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/s0735-1097(01)01120-2
更新日期:2001-04-01 00:00:00
abstract:BACKGROUND:It is unclear whether the overall effectiveness and safety of direct oral anticoagulants (DOACs) are consistent in patients with nonvalvular atrial fibrillation (AF) and extremely low body weight (<50 kg). OBJECTIVES:This study compared DOACs with warfarin in AF patients with low body weight. METHODS:Using...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,多中心研究
doi:10.1016/j.jacc.2018.11.051
更新日期:2019-03-05 00:00:00
abstract:OBJECTIVES:The purpose of this study is to describe the outcome in cardiogenic shock treated with aggressive reperfusion therapy and to identify factors predictive of in-hospital and long-term mortality. BACKGROUND:Cardiogenic shock is the most common cause of death in patients admitted to the coronary care unit. Alth...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/0735-1097(92)90440-x
更新日期:1992-12-01 00:00:00
abstract:OBJECTIVES:The purpose of this study was to define the incidence and characterization of cardiovascular cause of sudden death in the young. BACKGROUND:The epidemiology of sudden cardiac death (SCD) in young adults is based on small studies and uncontrolled observations. Identifying causes of sudden death in this popul...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/j.jacc.2011.01.049
更新日期:2011-09-13 00:00:00
abstract:OBJECTIVES:The purpose of this study is to investigate the role of endogenous endothelin-1 (ET-1) in myocardial growth in Bio 14.6 Syrian cardiomyopathic hamsters (Bio). BACKGROUND:While ET-1, as a growth-promoting peptide, has been implicated in the development of secondary cardiac hypertrophy, the role of endogenous...
journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章
doi:10.1016/s0735-1097(98)00564-6
更新日期:1999-02-01 00:00:00