New nomenclature and computerized programme of graphics for the description and recording of aortocoronary bypasses.

In the process of drawing up a computerized operation reporting system, a nomenclature for the precise description of recently fitted or existing aortocoronary bypasses has been developed. This is based on a sequence of letters showing in one line which type of bypass has been fitted, the graft material used, the central anastomosis (source) as well as the peripheral anastomoses on the coronary arteries (objective). For this purpose, abbreviations of the customary terms in use in cardiac surgery have been used. A computer graphics programme has been created in parallel, enabling all bypasses (existing and/or new) to be sketched into the diagram of a heart with the aid of a mouse. The bypass nomenclature is automatically generated from the diagram, which can also be printed out as a sketch of the operation. The complete diagram of the heart plus data input forms enable the operation report to be compiled automatically. The nomenclature and the graphics programme are easily learnt, simplify work, can readily be incorporated into a computerized hospital organization and enhance documentation quality.

Methodological Conditions of Congruent Factors: A Comparison of EEG Frequency Structure Between Hemispheres.

A study was conducted to examine congruence relations of EEG frequency factors between hemispheres. The central questions were aimed at procedural details of the factoring process which have the greatest "destructive" influence on congruence of factor patterns. On the basis of serially-rotated oblique solutions and evaluative simple structure criteria, two methodological results are reported: (a) the original principal components of two lead placements show a marked departure from an ideal congruence pattern, but can be forced into high congruence beyond 0.90 for the first twelve components by orthogonal procrustes rotation; (b) after this matching of principal components the expected optimum of congruence is only achieved in rotated solutions showing an optimal simple structure in terms of the Index of Factorial Simplicity (Kaiser, 1974). Additionally, the study leads to two substantive electroencephalographic results; (c) the factorial frequency structure of spontaneous EEG from two homologous positions (C3, C4) of the hemispheres is highly congruent. Thus, an identical measurement rationale for EEG frequency bands can be justified in asymmetry research; (d) the spectral dimensions of the alpha region show good correspondence to a recently published synoptic model of factor analytically defined EEG bands (Andresen, Thom, Irrgang, & Stemmler, 1982). The weight system of the three alpha components in this model can be recommended for psychophysiologically oriented EEG research.