Electrocardiographic imaging is an inverse problem which consists of computing epicardial potential distributions from measurements of body surface potentials. Smoothing and attenuation of the electric field by the intervening body volume conductor render the problem ill posed, requiring regularization to stabilize the inverse solution. This paper reports a study on the efficacy of nonsmooth re...

Several changes in electrocardiographic examination may arise from training in horses, since changes in heart rate, heart rhythm and conduction system, until changes in ventricular depolarization and repolarization. The knowledge of the electrocardiographic profile specific to each modality allows the physical monitoring, distinguishing physiological responses from pathological conditions. In t...

Long-term ambulatory electrocardiographic (Holter) monitoring is frequently used to evaluate patients with various cardiovascular complaints, including palpitations, dyspnea, discomfort in the chest, dizziness, and syncope. In the present study, 518 consecutive 24-hour electrocardiographic recordings were reviewed to determine correlations between cardiac diagnoses, presenting complaints, and s...

OBJECTIVE To assess the usefulness of Doppler tissue imaging (DTI) for evaluating the systolic function of chagasic patients with and without electrocardiographic abnormalities, in comparision with echocardiographic study. METHODS We studied 77 patients divided into 3 groups as follows: group 1 - control; group 2 - chagasic patients with normal electrocardiographic findings; and group 3 - cha...

An evaluation of electrocardiographic tracings as an index of myocar(lial (lamage in survivors of subacute bacterial endocarditis wvas undertaken in a study of 76 fatal cases of the disease. Anatomic changes, plresent in all, inclu(ledl myocarditis, perivascular infiltration and fibrosis, Aschoff bodies, infarets, and intravascular emboli. Electrocardiographic tracings revealed changes which co...

IN CERTAIN FORMS of heart disease whenl the diagnosis is readily apparent from clinical examination, it would be desirable to assess the degree of hemodynamic abnormality by the simplest method. If electrocardiographic data could provide a sufficientlv accurate indication of altered funetioii, the need for cardiac catheterization might be obviated. However, detailed electrocardiographic criteri...

The symptomatic, electrocardiographic, and circulatory effects of intravenous and oral preparations of propranolol, oxprenolol, and practolol were compared in 16 patients with uncomplicated angina pectoris precipitated by exertion. The method of study included treadmill exercise, double-blind assessment, single-blind analysis, with placebo control and randomized serial comparison of each drug i...

The prevalence of ischaemic heart disease was determined by an administered questionnaire and electrocardiography in 7735 men aged 40-59 years drawn at random from general practices in 24 British towns. Overall, one quarter of these men had some evidence of ischaemic heart disease on questionnaire or electrocardiogram or both. On questionnaire, 14% of men had possible myocardial infarction or a...