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PubMed1981

[Pattern quantification of coronary artery stenosis by computerized analysis of multiple ECG parameters (author's transl)].

Coronary angiograms of 200 patients with coronary artery disease were studied. The distribution of stenoses was analyzed and classified utilizing a special score, taking into account coronary supply pattern (according to Baroldi et al.), localization and severity of stenosis, as well as collateralization. Frank-lead vectorcardiograms were obtained and analyzed by computer. 140 scalar and spatial vector parameters were evaluated. A statistical comparison was made in 36 patients with highgrade stenoses of the left anterior descending branch of the left coronary artery with 37 patients without such vascular narrowing. Utilizing 4 ECG-parameters a mathematical formula can be derived which separates the two groups. Another equation based on 5 parameters allows the calculation of a score from conventional electrocardiograms. By discriminance analysis a specificity of 78.4% and a sensibility of 77.8 in prediction results for the group with stenosis. For the control group a specificity of 75.7% and a sensibility of 77.8% were computed. Correlation between the score obtained by calculation on the one hand, and the score derived from direct analysis of the arteriogram was highly significant with an r = 0.796.

Angina Pectoris↗
PubMed2001

Model TJ-IV computer-assisted vectorcardiogram analysis system.

During last 16 years we have successfully developed the computer-assisted vectorcardiogram analysis systems: model TJ-I, TJ-II, and TJ-III, but some technical problems remained unresolved, such as the recognition accuracy for vectorcardiograms, measurement of the parameters of complicated QRS waves, the ratio of T loop length to width, and the area of spatial vectors etc. A new system, model TJ-IV was designed to resolve these technical problems. The system was equipped with a 586 computer with a CPU of 120 MHz. Special new low-noise amplifier was employed and C language was used for programming. Three graph recognition techniques were used to enhance the accuracy of VCG recognition. 32 orthogonal electrocardiograms and vectorcardiograms were displayed and printed, and 566 parameters of vectorcardiograms were calculated. Our results with 150 cases showed that the system had high accuracy of graph recognition, and parameter calculation and the results were essentially consistent with those of manipulative methods. We were led to concluded when compared with TJ-III system, the new version has higher accuracy of processing and measurement for vectorcardiograms, is able to process more vectorcardiographic parameters, with higher processing speed.

Adult↗
PubMed2004

Signal-averaged electrocardiography in normal newborn infants.

Signal-averaged electrocardiograms (SAECGs) were recorded with bipolar orthogonal and standard 12-lead settings in 29 term healthy newborn infants. SAECGs performed with the two lead configurations were similar in quality and quantity. For the duration of the QRS complex (QRSD), the upper limit of normality for newborn infants can be set to 100 ms. It is similar in individual bipolar orthogonal and individual standard 12-lead recordings as well as in filtered QRSD in the vectorcardiograms (the vector magnitude, VM, and the sum of extremity leads). In individual leads of bipolar orthogonal and standard 12-lead recordings, root-mean-square voltage of the terminal 40 ms of the QRS complex (RMS40) is widely scattered and unsuitable as discriminant variable. For VM and the sum of the extremity leads, the same reference values for RMS40 and duration of low-amplitude signal can be used as applied in adults. Individual lead recordings provide complementary information in addition to vectorcardiograms. There are practical advantages using standard 12-lead compared to conventional bipolar orthogonal configurations. The widespread use of standard 12-lead ECG in routine medical practice makes its utility advantageous also in performing signal-averaged electrocardiography.

Electrocardiography↗
PubMedDate not supplied

Double outlet right ventricle with intact atrial septum and restrictive ventricular septal defect: an analysis of two cases.

Two cases of double outlet right ventricle with restrictive ventricular septal defect are described. This is an uncommon presentation that causes left ventricular dysfunction because of left ventricular outflow tract obstruction. The presence of an intact atrial septum leads to severe pulmonary hypertension, which tends to aggravate the right ventricular output. In the presence of a normal left ventricle, the authors suggest the possibility of enlargement of the ventricular septal defect in order to perform a biventricular repair. The association of a supramitral valve ring in both cases, and the isolation of the left subclavian artery and an aortopulmonary fenestration in one of these cases, are also discussed. In addition we explore factors that cause restrictive ventricular septal defects as well as the mechanisms that may lead to spontaneous closure of ventricular septal defect in a double outlet right ventricle.

Child, Preschool↗