Summary
Investigation of the membranous portion of the interventricular septum (MPIS) and its relationship with the aortic valve was performed in 32 human hearts of adult individuals (19 Caucasians and 11 non-Caucasians). With transillumination of the MPIS the specimens were photographed and 35 mm slides obtained. These were digitized into Apple Macintosh II using a Dage Model 68 video camera and a Data Translations DT 2255 frame grabber. The areas and the distances were traced manually, using the NIH Image program (Wayne Rasband, NIH, Research Services Branch, NIHM). The following forms of MPIS were found: oval (31.3%), triangular (28.1%), quadrangular (18.8%), circular (15.6%) and semilunar (6.2%); its surface area varied from 5.65 mm2 to 142.63 mm2 (mean 48.82±29.17 mm2). The superior border of the MPIS was in close relationship with the aortic valve, and its upper part was usually (41%) in direct continuity with the attachments of both right (RAC) and posterior (PAC) aortic cusps, or with PAC (34%) or RAC (6%) only. Rarely (19%) the MPIS lay below the attachments of both cusps. The distance between the MPIS superior border and the attachment of the RAC was not greater than 5.89 mm (mean 1.69 mm±1.9 mm). The distance between the superior border of the MPIS and the attachment of the PAC was not greater than 5.63 mm (mean 0.77±1.49 mm). Differences between sex, race and age groups were not statistically significant.
Résumé
L'étude de la portion membraneuse du septum interventriculaire (PMSIV) et de ses rapports avec la valve aortique a été réalisée sur 32 cœurs humains adultes (19 Caucasiens et 11 non-Caucasiens). Sous transillumination, la PMSIV est photographiée et les diapositives de 35 mm obtenues sont numérisées dans le Apple MacIntosh II, utilisant une caméra vidéo « Dage Model 68 » et un convertisseur d'images « DT 2255 frame grabber ». Les surfaces et les distances sont tracées manuellement, utilisant le « programme d'images NIH » (Wayne Rasband, NIH, Research Services Branch, NIHM). Les formes suivantes de la PMSIV ont été observées : ovale (31,3 %), triangulaire (28,1 %), quadrangulaire (18,8 %), circulaire (15,6 %) et semi-lunaire (6,2 %). Sa surface varie de 5,65 mm2 à 142,63 mm2 (moyenne 48,82±29). Le bord supérieur de la PMSIV contracte des rapports intimes avec la valve aortique; sa partie haute est habituellement en continuité directe avec les pieds d'insertion des valuvles aortiques : les deux valvules droite (VAD) et postérieure (VAP) dans 41 %; la VAP ou la VAD isolément, respectivement dans 34 et 6 % des cas. Rarement (19 %) la PMSIV se situe au-dessous des bords adhérents de ces valvules VAD et VAP. La distance entre le bord supérieur de la PMSIV et l'insertion de la VAD n'est pas supérieure à 5,89 mm (M : 1,69 mm±1,9 mm). La distance entre le bord supérieur de la PMSIV et l'insertion de la VAP n'est pas supérieure à 5,63 mm (M : 0,77±1,49 mm). Les différences entre sexes, races et âges ne sont pas statistiquement significatives.
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Teofilovski-Parapid, G., Baptista, C., DiDio, L. et al. The membranous portion of the interventricular septum and its relationship with the aortic valve in humans. Surg Radiol Anat 13, 23–28 (1991). https://doi.org/10.1007/BF01623136
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DOI: https://doi.org/10.1007/BF01623136