Abstract:
BACKGROUND:Nitroglycerin is known to augment vessel wall squeezing at the site with coronary-myocardial bridging (CMB). This study was designed to define the mechanism of nitroglycerin-induced augmentation of CMB in clinical settings. METHODS:We analyzed nitroglycerin reactivity at the site with CMB in 39 patients. Maximal and minimal diameters of CMB during a cardiac cycle were measured by quantitative angiography before and after intracoronary administration of 250 microgram nitroglycerin. In 15 patients, CMB sites were observed by intravascular ultrasound to determine the intimal thickness and the time-serial change in vessel area. RESULTS:Before nitroglycerin, CMB was demonstrated with angiography in 25 patients, and the remaining 14 patients showed CMB after nitroglycerin. The maximal diameter during diastole increased from 1. 4 +/- 0.4 mm to 1.9 +/- 0.4 mm after nitroglycerin, whereas the minimal diameter during systole decreased from 1.0 +/- 0.4 mm to 0.7 +/- 0.4 mm (P <.01). Thus nitroglycerin augmented the percent vessel narrowing during systole from 24% +/- 21% to 65% +/- 16% (P <.01). Under these conditions, intravascular ultrasound showed the reduction of the cross-sectional area of the sites with CMB by -38% +/- 16% (P <.01) during systole, and this phenomenon continued to early diastole (-30% +/- 16%). The intimal thickness was 0.32 +/- 0. 10 mm, which suggests the absence of atherosclerotic disease at CMB sites. CONCLUSIONS:These results indicate that nitroglycerin-induced augmentation of the percent narrowing of CMB can be derived from further systolic compression of the vessel lumen as well as diastolic expansion, probably because of the increase in vessel compliance after nitroglycerin. We suggest that the delayed dilation of coronary lumen during the early diastole may contribute to the occurrence of myocardial ischemia.
journal_name
Am Heart Jjournal_title
American heart journalauthors
Hongo Y,Tada H,Ito K,Yasumura Y,Miyatake K,Yamagishi Mdoi
10.1016/s0002-8703(99)70123-7subject
Has Abstractpub_date
1999-08-01 00:00:00pages
345-50issue
2 Pt 1eissn
0002-8703issn
1097-6744pii
S0002870399000277journal_volume
138pub_type
杂志文章abstract::Subclinical myocardial involvement frequently occurs in patients with systemic lupus erythematosus (SLE). In this study, left ventricular diastolic function was assessed in 58 patients (54 female and 4 male; mean age 32 +/- 11 years) and in 40 sex-matched and age-matched healthy control subjects (37 female and 3 male;...
journal_title:American heart journal
pub_type: 杂志文章
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abstract::To investigate the mechanisms of restenosis and detect useful interventions to prevent it, reliable quantitative measurements must be evaluated. Coronary arteries of domestic and minipigs (n = 18) were mechanically injured by balloon overstretching and killed at different intervals (2 to 25 weeks) after quantitative a...
journal_title:American heart journal
pub_type: 杂志文章
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abstract::In January 1997, experts from the United States, Europe, and Japan gathered at Stanford University to review their collective experience with intracoronary and noncoronary stenting and to identify and prioritize issues requiring further clinical investigation. This report summarizes the discussions that took place dur...
journal_title:American heart journal
pub_type: 杂志文章,评审
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更新日期:1998-10-01 00:00:00
abstract::Ventricular late potentials at the end of the surface QRS, detected on the signal-averaged electrocardiogram (SAECG) have been shown to be markers for spontaneous and/or inducible ventricular tachycardia (VT) in patients with coronary artery disease (CAD). We examined the correlations between electrophysiologic study ...
journal_title:American heart journal
pub_type: 杂志文章
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更新日期:1988-04-01 00:00:00
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journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2004-02-01 00:00:00
abstract::Given the preventable morbidity and mortality associated with atrial fibrillation (AF), increased awareness of undiagnosed AF, and advances in mobile electrocardiogram (ECG) technology, there is a critical need to assess the effectiveness of using such technology to routinely screen for AF in clinical practice. VITAL-...
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pub_type: 杂志文章,多中心研究,随机对照试验
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abstract::The aim of this study was to assess the relative value of exercise echocardiography and perfusion single-photon emission computed tomography (SPECT) in identifying the presence and severity of coronary artery stenosis. Accordingly, 44 consecutive patients with stenosis in one vessel performed simultaneous postexercise...
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abstract::In a double blind, placebo-controlled study, the efficacy of propafenone, a new antiarrhythmic drug was compared to that of disopyramide. Sixteen patients with frequent and complex premature ventricular contractions (PVCs) were studied by serial 24-hour ambulatory monitoring, while they were receiving propafenone, 300...
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1985-04-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0002-8703(96)90062-9
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pub_type: 杂志文章
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更新日期:1995-07-01 00:00:00
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pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:2017-06-01 00:00:00
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journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(97)70203-5
更新日期:1997-02-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/0002-8703(83)90206-5
更新日期:1983-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-03-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2013-12-01 00:00:00
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doi:10.1067/mhj.2001.115587
更新日期:2001-06-01 00:00:00
abstract::To study the left ventricular (LV) diastolic function in uncomplicated insulin-dependent diabetic patients without hypertension (n = 25) and comparable controls (n = 15), the effect of acute administration of nitroglycerin and nifedipine on cavity dimensions and transmitral flow pattern was investigated by Doppler ech...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(93)90542-h
更新日期:1993-12-01 00:00:00
abstract::The 2,000 heart donors available annually continue to be inadequate for the 50,000 patients with end-stage congestive heart failure who require heart transplantation to survive. This discrepancy has led to the successful use of long-term implantable LVADs as a bridge to transplantation and has raised the issue of perm...
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journal_title:American heart journal
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1992-11-01 00:00:00
abstract:BACKGROUND:No-reflow after primary percutaneous coronary intervention (PCI) in ST-elevation myocardial infarction (STEMI) is associated with poor prognosis. Endothelin-1 (ET-1) is a potent endothelium-derived vasoconstrictor that might aggravate reperfusion injury. The aim of our study was to assess the relationship be...
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pub_type: 杂志文章
doi:10.1016/j.ahj.2010.02.019
更新日期:2010-05-01 00:00:00
abstract::Head-up tilt provokes vasodepressor syncope in patients with this disorder but may also cause fainting in unaffected subjects. The aims of this study were to examine autonomic function and sequential changes in heart rate variability and plasma catecholamines during graded head-up tilt in patients with vasodepressor s...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/s0002-8703(97)70213-8
更新日期:1997-02-01 00:00:00
abstract::The antihypertensive efficacy, safety, and lipid effects of doxazosin, a selective alpha 1-inhibitor, were assessed in a general practice setting. Three hundred twenty-six patients were entered into the study, which involved three phases: (1) a 2-week baseline period, (2) an 8-week period in which patients received 1 ...
journal_title:American heart journal
pub_type: 临床试验,杂志文章
doi:10.1016/0002-8703(91)90857-e
更新日期:1991-01-01 00:00:00
abstract:BACKGROUND:Low heart rate recovery (HRR) at exercise test and the metabolic syndrome (MetS) are both predictors of cardiovascular morbidity and mortality. We studied in 75-year-old women and men, representative of the general population, the relationship between (1) HRR and the MetS, (2) HRR and the individual componen...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2007.06.025
更新日期:2007-09-01 00:00:00
abstract:BACKGROUND:Patients with heart failure frequently exhibit intraventricular conduction delays, which contribute to asynchronous contraction patterns and impaired hemodynamic performance. Cardiac resynchronization therapy (CRT) with biventricular (BV) and left ventricular (LV) pacing has been shown to improve both hemody...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2002.119616
更新日期:2002-01-01 00:00:00
abstract:BACKGROUND:Postinterventional cognitive dysfunction (PICD) is a known complication of coronary artery bypass grafting (CABG). However, it is largely unknown whether PICD occurs after coronary catheterization. METHODS:Neuropsychologic data were obtained from 37 patients who received coronary catheterization and 47 pati...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/j.ahj.2011.07.021
更新日期:2011-10-01 00:00:00
abstract:OBJECTIVE:To analyze the effect of delay times on racial differences in thrombolysis for acute myocardial infarction. BACKGROUND:Lower rates of thrombolytic therapy in blacks with acute myocardial infarction have recently been reported, but the reasons for this disparity are unknown. We hypothesized that lower rates o...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1067/mhj.2000.109644
更新日期:2000-10-01 00:00:00
abstract::To evaluate the risk factors for coronary disease, 345 women, aged 35 to 59 years, who had undergone coronary arteriography for suspected coronary disease completed a mail questionnaire, telephone interview, or both. Two hundred eight women with angiographically normal coronary arteries constituted the control group, ...
journal_title:American heart journal
pub_type: 杂志文章
doi:10.1016/0002-8703(89)90398-0
更新日期:1989-06-01 00:00:00