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Biomedical subjects

L G Veasy

Publications and source records attributed to L G Veasy.

28 records · Page 2Linked to original sources
PubMed1979

Conduction system in two cases of sudden death two years after the Mustard procedure.

This report describes a serial section examination of the conduction system in two children who died suddenly 2 years following the Mustard procedure for complete transposition. The first child manifested sinus rhythm alternating with junctional rhythm in the last year of life. The second child, 2 months before death, had first-degree atrioventricular (AV) block which progressed to second-degree block with 2:1 conduction alternating with a junctional rhythm with AV dissociation. Examination of the conduction system in both cases revealed the approaches to the sinoatrial (SA) and the AV nodes to be markedly fibrosed. In addition, in Case 1 the SA node was interrupted by sutures and in Case 2 the SA node was considerably fibrosed. The arrhythmias produced and the probable cause of sudden death in both cases may be related to surgical injury to the approaches to the SA and AV nodes. This study and the review of the literature emphasize the necessity of maintaining the integrity of the SA node, the approaches to the SA and AV nodes, and the superior preferential pathway while performing the Mustard procedure for complete transposition.

Atrioventricular Node↗
PubMed1978

Shunt quantification by mathematical analysis of indicator dilution curves.

Mathematical models are presented for describing and analyzing indicator dilution curves recorded in patients with intracardiac and great vessel shunts. The models treat individual segments of the circulation as linear system blocks, each having, at its output, a characteristic time response to a rapid injection of indicator at its input. These blocks are combined in feedback and feed-forward configurations to simulate left-to-right, right-to-left, and bidirectional shunts. A shunt analysis algorithm, using discrete analogs of the linear system models, was implemented in a computer program and used to analyze thermodilution curves recorded in patients with congenital heart defects. Results are presented comparing shunt fractions obtained from thermodilution curve analyses with oximetrically determined values in 20 patients. Comparing left-to-right shunts measured by the two methods, the mean systematic difference was 0.7% of pulmonary flow and the standard deviation was 7.6% of pulmonary flow. Statistical validation of the bidirectional shunt method will require acquisition and analysis of more data; however, reasonable shunt fractions were computed in five cases studied and good agreement with oximetric determinations was obtained in two cases where complete oximetric data were available.

Adolescent↗
PubMed1976

Congenital complete heart block. Radiographic findings in 13 patients without associated defects.

The radiographic findings in 13 patients with congenital complete heart block without associated anomalies are presented to illustrate characteristic features. Findings related to the increased stroke volume in these patients include: (a) simulated shunt vasculature; (b) pulmonary venous pypertension with redistribution of blood flow to the upper lungs, and, in one patient, peribronchial edema; (c) cardiomegaly with right ventricular, pulmonary artery, left atrial, left ventricular, and aortic enlargement; and (d) variation in cardiac size on serial examinations. Less commonly seen were findings related to atrioventricular dissociation with transitory marked pulmonary venous hypertension present in one patient when left atrial contraction occurred during ventricular systole when the mitral valve was closed.

Cardiac Output↗