نتایج جستجو برای: qt طولانی

تعداد نتایج: 26905  

Journal: :Balkan medical journal 2013
Ozlem Güven Hilal Sazak Ali Alagöz Eser Savkılıoğlu Cilsem Sevgen Demirbaş Ali Yıldız Erdem Karabulut

BACKGROUND Many studies focusing on the effects of local anaesthetics on QT intervals have been performed, but the articles evaluating the relationship between thoracic epidural anaesthesia combined with general anaesthesia and QT parameters are very limited. AIMS We aimed to compare the effects of bupivacaine and ropivacaine on QT interval, corrected QT, dispersion of QT, and corrected dispe...

Journal: :JAMA 2003
Sana M Al-Khatib Nancy M Allen LaPointe Judith M Kramer Robert M Califf

CONTEXT Of the several factors implicated in causing QT interval prolongation and torsades de pointes, errors in the use of medications that may prolong this interval deserve special attention. OBJECTIVE To systematically summarize the available clinical data on the QT interval and to offer improved recommendations for the use of QT-prolonging medications. DATA SOURCES We searched MEDLINE f...

Journal: :Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2005
Michele Buemi Emanuele Aloisi Giuseppe Coppolino Saverio Loddo Eleonora Crascì Carmela Aloisi Antonio Barillà Vincenzo Cosentini Lorena Nostro Chiara Caccamo Fulvio Floccari Adolfo Romeo Nicola Frisina Diana Teti

BACKGROUND The risk of developing cardiovascular diseases is higher in patients on haemodialysis than in the general population. These patients may develop arrhythmias that depend on the extra- and intracellular concentrations of potassium. ECG findings, particularly the QT interval and its dispersion (QT(d)) and the QT(c) (QT interval corrected for heart rate according to Bazett's formula) and...

Journal: :the journal of tehran university heart center 0
mohammad alasti imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran. mohammad hassan adel imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran. ekhlas torfi imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran. mohammad noorizadeh imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran. sara bahadoram imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran. mahsa asadi moghaddam imam khomeini hospital, ahvaz jundishapur university of medical sciences, ahvaz, iran.

background: myocardial ischemia is one of several causes of prolonged qt dispersion. the aim of this study was to evaluate the effect that percutaneous coronary intervention has on the depolarization and repolarization parameters of surface electrocardiography in patients with chronic stable angina. methods: we assessed the effects of full revascularization in patients with chronic stable angin...

Journal: :IEEE Transactions on Knowledge and Data Engineering 2022

We address the problem of online change detection in multivariate datastreams, and we introduce QuantTree Exponentially Weighted Moving Average (QT-EWMA), a nonparametric change-detection algorithm that can control expected time before false alarm, yielding desired Run Length (ARL$_0$). Controlling alarms is crucial many applications rarely guaranteed by algorithms monitor datastreams without k...

ژورنال: :hormozgan medical journal 0
مرضیه نیک پرور m nikparvar گروه داخلی، بخش قلب، بیمارستان شهید محمدی، دانشگاه علوم پزشکی هرمزگان، بندرعباس، ایران شهداد خسروپناه sh khosro panah محمدحسن نعمتی m.h nemati حسین فرشیدی h farshidi

مقدمه: پراکندگی قطعه qt یا qt dispersion (اختلاف حداکثر و حداقل فاصله qt) نشان دهنده رپلاریزاسیون ناهمگون بطنی می باشد که ممکن است زمینه ای برای آریتمی های جدی بطنی باشد. این ناهمگونی می تواند باعث عواقب بد کلینیکی برای بیماری که درگیری عروق کرونر دارد، شود. بعضی از مطالعات نشان داده اند که پراکندگی qt بعد از آنژیوپلاستی موفق به دنبال برقراری مجدد جریان خون کرونر کاهش می یابد، ولی اثر cabg. کرو...

2015
Sadia Mubarak Syed Muhammad Imran Majeed Muhammad Alamgir Khan

Background: QT dispersion is the difference between the longest and the shortest QT intervals as measured from the 12 lead standard ECG. It reflects ventricular repolarisation heterogeneity which may lead to ventricular arrhythmias in certain cases. Myocardial ischemia plays a central role in the pathophysiology of prolonged QT dispersion leading to re-entrant type ventricular arrhythmias. Curr...

Journal: :Random Struct. Algorithms 1994
Béla Bollobás Yoshiharu Kohayakawa Tomasz Luczak

The n-dimensional cube Q is the graph whose vertices are the subsets of {1, . . . , n}, with two vertices adjacent if and only if their symmetric difference is a singleton. Clearly Q has diameter and radius n. Write M = n2n−1 = e(Q) for the size of Q. Let Q̃ = (Qt) M 0 be a random Q-process. Thus Qt is a spanning subgraph of Q n of size t, and Qt is obtained from Qt−1 by the random addition of a...

Journal: :acta medica iranica 0
mohammad assadpour piranfar department of cardiology, taleghani hospital, shahid beheshti university of medical sciences, tehran, iran

the relationship between qt dispersion and myocardial ischemia is still controversial. therefore, we aimed to investigate the relationship between qtd and the severity and extent of myocardial ischemia. in this cross-sectional study, 141 patients having symptoms of cad who referred to our medical center during 2009-2010, and were examined with myocardial isotope scan and ecg, were enrolled. bas...

Journal: :The Netherlands journal of medicine 2014
A A Kan D W de Lange D W Donker J Meulenbelt

Many drugs can significantly influence cardiac repolarisation causing an increased duration of this repolarisation phase, challenging the repolarisation reserve. This may set the stage for life-threatening ventricular arrhythmias such as torsades de pointes (TdP). TdP generally occurs in conjunction with a prolonged QT interval (QT) on the electrocardiogram. The Dutch Poisons Information Centre...

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