نتایج جستجو برای: مدت زمان qtc
تعداد نتایج: 144188 فیلتر نتایج به سال:
dose-dependent effects of methadone on qt interval in patients under methadone maintenance treatment
background: the role of methadone in qtc prolongation, torsades de pointes (tdp) arrhythmia and sudden cardiac death has been debated. because of widespread use of methadone in methadone maintenance treatment (mmt) centers, we aimed to study dose-related effects of methadone on qtc prolongation. methods: in a comparative observational study, 90 patients who were under mmt were evaluated. patien...
OBJECTIVES To explore the effect of aging on cardiac toxicity specifically the interaction of age and antipsychotic drugs to alter the QT interval. METHODS THE MEDLINE DATABASES WERE SEARCHED USING THE OVIDSP PLATFORMS WITH THE SEARCH STRATEGY: "QT interval" or "QT" and "age" or "aging". The entry criteria were: over 10,000 apparently healthy individuals with data on both sexes; QT interval c...
AIMS Identification of a prolonged, corrected QT (QTc) interval in athletes may be a recommendation for disqualification from competitive sports. However, the prevalence and diagnostic significance of an isolated prolonged QTc in asymptomatic athletes without familial disease is unknown. METHODS AND RESULTS Between 1996 and 2006, 2000 elite athletes (mean age, 20.2 years) underwent 12-lead EC...
PURPOSE Ventricular repolarization is assessed using the QT interval corrected by the heart rate (QTc) via an electrocardiogram (ECG). Prolonged QTc is associated with an increased risk of arrhythmias and cardiac mortality. As there have been few reports regarding the effects of hyperthyroidism on ventricular repolarization, we studied the association between serum free thyroxine (free T4 [fT4]...
OBJECTIVES Heart-rate corrected QT (QTc) interval predicts cardiovascular mortality or all-cause mortality in the general population. Little is known about the best cut-off value of QTc interval for predicting clinical events in patients with ST-elevation myocardial infarction (STEMI). METHODS We enrolled 264 patients with STEMI who received measurement of QTc intervals at ER (QTc-ER), on day...
BACKGROUND Assessment of repolarization duration is often recommended to avoid administration of QT-prolonging drugs in patients with prolonged QTc interval, a frequent situation in the postoperative period. Bazett QT correction inappropriately increases QTc when heart rate is increased, and the use of the Fridericia formula may avoid a falsely prolonged QTc interval. The authors assessed autom...
ramadan fasting is one of the most important religious duties of muslims, that its effect on the heart has not been determined yet. our objective was to evaluate the effect of ramadan fasting on ventricular repolarization as assessed by qt interval, corrected qt interval, qt dispersion or corrected qt dispersion. sixthy healthy subjects aged 20 to 35 years were dispersion included in this study...
کم کاری تحت بالینی تیروئید تظاهرات و عوارض قلبی و عروقی گوناگونی دارد که این تظاهرات و عوارض در کم کاری آشکار تیروئید به وفور مورد مطالعه قرار گرفته است اما در مورد کم کاری تحت بالینی و عوارض آن بر سیستم قلبی و عروقی به شکل محدود مورد بررسی قرار گرفته است. فاصله qtc و در الکتروکاردیوگرافی نشان دهنده میزان زمان دپولاریزاسیون و رپولاریزاسیون بطن¬ها می¬باشد و qt dispersion بیانگر تفاوت در میزان تغ...
BACKGROUND/AIMS Although transient changes in the electrocardiogram (ECG) of patients with stress-induced cardiomyopathy (SCMP) are common, there are little data about ECG changes in patients with SCMP and the clinical implications of these variations. METHODS We investigated a total of 128 patients (age, 63.2 ± 15.4 years; female, 60.9%) diagnosed with SCMP. We compared the ECGs taken after ...
Background HAART has improved survival of HIV patients. Its contribution to the development of new cardiovascular abnormalities has generated much interest. This study aimed at determining the prevalence of QTc prolongation among HIV patients and determining the influence if any of the use of HAART on the QTc and on the risk of having QTc prolongation. Materials and Methods One hundred and fi...
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