OKHAWA and his colleagues have provided histologic evidence that a lesion in the distal or branching portion of the His bundle, and thus actually within the ventricles, may produce complete atrioventricular (AV) block on the surface ECG associated with "AH" block on the His bundle electrogram (atrial impulses blocked proximal to the His deflection) and that this may be associated with an escape...

Y THE TIME the patient with acute myocardial infarction is first examined, his electrocardiogram may already show changes in the RS-T segment alone, in the T wave alone, in the QRS complex alone, or in any combination of the three. Changes in any of these portions of the ventricular complex and particularly in the QRS may not appear for hours or days. Some never show distinctive electrocardiogr...

The widespread use of medical information systems and rapid growth of medical databases require methods of efficient computer-assisted analysis. In this paper we focus on the QRS complex detection in electrocardiogram but, the idea of further recognition of anomalies in QRS complexes based on the immunology approach is described, as well. In order to detect QRS complexes, a neural network ensem...

Fifty-nine (42 %) of 140 schizophrenic patients taking phenothiazines were found to have abnormal electrocardiograms. The abnormalities included T wave changes, S-T depression, P-R and Q-T prolongation, persistent sinus tachycardia (110 or more/min) and right bundle branch block. In forty-eight (34%) of the fifty-nine patients, the ECG abnormalities disappeared after stopping the phenothiazine ...

Endomyocardial fibrosis (EMF) is a distinct obliterative cardiomyopathy characterized anatomically by right/left/bi ventricular endocardial fibrotic thickening and varying degrees of obliteration of the ventricular cavity. Chamber obliteration leads to diastolic restriction to ventricular filling and thus diastolic ventricular dysfunction. Involvement of the chordae tendinae and papillary muscl...

AIMS automatic detection of the QRS complex on electrocardiogram (ECG) is used on cardiac ultrasound scanners to separate ultrasound image series into cardiac cycles for playback and storage. On small hand-held scanners it is unpractical to connect ECG cables. We therefore aim to do automatic cardiac cycle separation using apical B-mode ultrasound images. METHODS AND RESULTS cardiac cycle len...

We describe a simplified method for interpreting a pediatric electrocardiogram (EKG). The method uses 4 steps and requires only a few memorized rules, and it can aid health care providers who do not have immediate access to pediatric cardiology services. Most pediatric EKGs are normal. However, both abnormal and normal EKGs should be sent to a pediatric cardiologist for later, confirmatory inte...

• Although indirect fetal electrocardiograph}' in human pregnancies is becoming common,' electrocardiograms of mammalian fetuses in utero by the direct approach are not. During a general electrophysiological study of rabbit fetuses, we found that electrocardiograms could be obtained easily with needle electrodes. We expanded our observations by making recordings of cardiac potentials via needle...

O NE of the most difficult tasks which confronts the w orker in the life sciences is to define a normal. The difficulty is compounded when the measurement to be made is affected by many variables which differ in importance from time to time. These remarks apply to the electrocardiographer, and to the normal electrocardiogram. Some variables which affect the electrocardiogram are quite well know...