نتایج جستجو برای: ecg changes
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Background and Aims: Ecstasy or 3, 4-methylenedioxymethamphetamine (MDMA) is a brain stimulant and a hallucinogenic material prepared by chemical changes in amphetamine. The aim of this study was to evaluate the changes induced by this drug in mouse cardiac histopathology, electrocardiogram (ECG) and blood cell counts. Materials and Methods: In this experiment, 3 groups (n=10) of mice were e...
OBJECTIVE To determine if ECG repolarization measures can be used to detect small changes in serum potassium levels in hemodialysis patients. PATIENTS AND METHODS Signal-averaged ECGs were obtained from standard ECG leads in 12 patients before, during, and after dialysis. Based on physiological considerations, five repolarization-related ECG measures were chosen and automatically extracted fo...
BACKGROUND Patients with ischemic electrocardiographic (ECG) findings during exercise stress testing but normal perfusion images generally have a low risk of cardiac death or myocardial infarction (<1% per year). During vasodilator stress testing, however, the prognostic significance of the combination of normal perfusion images and ischemic ECG changes is unknown. METHODS AND RESULTS Among 5...
The development of changes in the electrocardiogram during the acute phase of cerebrovascular lesions is a well-recognized phenomenon. Burch, Meyers, and Abildskov (1954) defined these changes as typically consisting of inversion of the T waves, which were of considerable amplitude and width, in standard and chest leads, prolongation of the QTc interval and the presence of U waves. They encount...
A 49-year-old man presented to the emergency department with a 3-month history of increasing ataxia, tremors, and slurred speech. He had a history of bipolar disorder that required lithium, carbamazepine, and risperidone therapy for mood modulation. A serum lithium level measurement was performed and was found to be 2.5 mmol/L (therapeutic range 0.8 to 1.2 mmol/L). There was no history of suici...
Athletes require regular intensive exercise and training, responsible for structural and functional changes in their hearts, which are reflected on electrocardiogram (ECG) findings [1]. The changes may include elevated QRS voltage, QRS axis shifts, ST-T wave changes that are consistent with early repolarization, bradyarrhythmias, first-degree and Mobitz type-1 atrioventricular block and inverte...
ECG is an important tool for the primary diagnosis of heart disease; it shows the electrophysiology of the heart and the ischemic changes that may occur like the myocardial infarction, conduction defects, and arrhythmia. The ECG signal must be clearly represented and filtered to remove all noise and artifacts from the signal. In this paper a new approach to filter the ECG signal from noise is p...
The recording of heart signal is called Electrocardiogram (ECG). ECG is used to measure, analyze, observe the heart function and heart abnormalities like cardiac murmur, myocardial infarction etc. The ECG electrodes are sensitive in nature, even the small noise mixed with original signal changes the ECG wave pattern. The ECG signal voltage ranges from 0.5 to 6mV and artifacts can be easily mixe...
Ab s t r a c t – This paper proposes a lead method and a processing means for monitoring the 12-lead electrocardiogram (ECG) with four standard leads. Leads I, II of the M-L leads and leads V1, V6 of the chest leads are used to record the ECG signals. The ECG waveforms of leads V2 through V5 are derived from the input signals using the least squares method based on the Frank torso model. This m...
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