BACKGROUND Restenosis after primary percutaneous coronary intervention (PPCI) remains an important clinical problem, even with stent implantation. The ability of noninvasive testing to diagnose restenosis has had only inconsistent demonstration. OBJECTIVE Our objective was to evaluate the ability of exercise treadmill testing (ETT) and myocardial perfusion imaging (MPI) to diagnose restenosis...

LLECTROCARDIOGRAMS of patients with low concentrations of extracellular potassium frequently show characteristic abnormalities that disappear after administration of potassium salts.1' 2 Regression of the electrocardiographic pattern of hypopotassemia during administration of potassium is characterized by a gradual increase of T-wave amplitude, decrease of U-wave amplitude, and diminution of S-...

BACKGROUND A widened QRS complex as a primary indication for cardiac resynchronization therapy (CRT) for heart failure patients has been reported to be an inconsistent indicator for dyssynchronous ventricular activation. The purpose of this study was to conduct a detailed experimental investigation of total ventricular activation time (TVAT), determine how to measure it accurately, and compare ...

T wave inversions on electrocardiogram (ECG) can manifest from any process that result in a relative delay in regional ventricular repolarization. A variety of clinical syndromes can cause T-wave inversions, ranging from life-threatening events to entirely benign conditions. The differential diagnosis of precordial T wave inversion leads is not always straightforward and can represent the grey ...

Electrocardiographic changes were evaluated retrospectively in five patients without previous episodes of syncope or ventricular fibrillation who developed abnormal ST segment elevation mimicking the Brugada syndrome in leads V1-V3 after the administration of class Ic antiarrhythmic drugs. Pilsicainide (four patients) or flecainide (one patient) were administered orally for the treatment of sym...

Secondary R waves in leads V1 or V3R are definitely abnormal if the primiary R wave is high for the age group even though the R' is small; if the secondary R wave is more than 6 nmm.; or if the R'/S ratio exceeds 1. Other patterns may be found both in patients with heart disease and in normal subjects. In the abnormal cases, the QRS changes persist in leads taken below but in line with V1 and V...

abstract background: brugada syndrome (bs) is an inherited ion channelopathy characterized by an electrocardiographic (ecg) pattern of a coved type st segment elevation in right precordial leads with or without right bundle branch block. case presentation: a 23-year old male presented with right lower quadrant abdominal pain. further evaluation revealed a diagnosis of acute appendicitis. the pa...

pulmonary embolism is considered as a great masquerader due to its frequent nonspecific signs and symptoms. typically pulmonary embolism is under-diagnosed or over-diagnosed. in this study a patient with pulmonary embolism is reported in which the patient exhibited two unusual manifestations namely; right upper quadrant abdominal pain and st-t elevation in anterior precordial leads. due to the ...