(1) However, the PTFE suture did exhibit some viscoelastic characteristics (hysteresis and creep) that begin to approach the chordal behavior.
(2) Serial studies demonstrated eventual disruption of the chordal attachments of the anterior tricuspid leaflet resulting in frank leaflet flail.
(3) In two patients with a clinical picture of acute mitral insufficiency, the presence of chordal rupture secondary to myxomatous degeneration of the mitral valve was disclosed during surgery.
(4) In the valves with subvalvar involvement splitting started at the apex of spaces between the fused chordal columns and proceeded upward.
(5) Complications are disturbances of rhythm, bacterial endocarditis and in case of a chordal rupture a mitral regurgitation.
(6) In two cases, if appeared to arise in the region between the aortic and mitral rings; in one instance, it was located in the mid left ventricle, in the mitral chordal region.
(7) The native valve was completely excised and all chordal attachments were severed at the head of each papillary muscle.
(8) We examined ventricular contractile function and ejection performance and isolated myocyte function after correction of experimental mitral regurgitation (chordal rupture) with mitral valve replacement that involved chordal preservation.
(9) Comparing these patients with those with ruptured mitral chordae in association with rheumatic heart disease and patients with spontaneous chordal rupture, differences were evident.
(10) During MVR with complete chordal preservation, snares were placed around the anterior and posterior papillary muscles.
(11) The authors provide the results of the use of two-dimensional echocardiography for diagnosing chordal ruptures of the mitral valve depending on the etiological factor of chordal pathology (mesenchymal abnormalities, rheumatic fever, infective endocarditis, coronary heart disease).
(12) Fluttering chorda (FC) of the mitral valve (MV) manifesting by hyperkinesia of usually fixed MV chorda, its early systolic dislocation into the left ventricular outflow tract was registered in 34.5% of ICM patients, 11.2% of them had echocardiographic evidence of the chordal shift in the systole into the above tract.
(13) It appears that Carpentier's sliding commissuroplasty is a superior new reconstructive technique for mitral regurgitation due to commissural chordal rupture.
(14) Retrospective examination of the cineangiogram revealed the presence of balloon indentation at the chordal level during inflation, which disappeared at full inflation.
(15) The chordal rupture was due to idiopathic degenerative disease in 14 patients, infective endocarditis in three and trauma in one.
(16) The technique used was a combination of posterior semicircular annuloplasty, mitral commissurotomy and chordal shortening.
(17) Mitral chordal rupture was nearly as frequent in the 64 patients with clearly dilated anular circumferences as in the 19 patients with normal or insignificantly dilated anular circumferences (less than or equal to 11 cm).
(18) The valve was repaired by pericardial chordal replacements and ring annuloplasty.
(19) In particular, anterior and inward displacement of the papillary muscles can be predicted to alter the effectiveness of chordal support so that the central leaflet portions become relatively slack and are more readily displaced anteriorly.
(20) Valve abnormalities, consisting of chordal attachments to the infundibular septum or ventricular septal crest, straddling, overriding or some combination of these, were identified in 25 of 39 patients (64%) in group I, no patients in groups II or IV and 6 of 30 patients (20%) in group III.
Notochord
Definition:
(n.) An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.
Example Sentences:
(1) The histochemical study of the LDH in the Trout embryo during the early organogenesis shows a specific localization in notochord cells, in mesodermic cells of the terminal knob and in some prosencephalic neuroblasts.
(2) The notochord, which is composed of a stack of flat cells surrounded by a connective tissue sheath, elongates dramatically and begins straightening between stages 21 and 25.
(3) Autoradiographic studies show that tritiated proline is taken up by notochordal cells and secreted to the extracellular space where label is associated with basal lamina, microfibrils and ground substance.
(4) Metabolic events in somites related to hyaluronic acid are not influenced by the notochord.
(5) The establishment of myeloschisis was followed by local separation of the notochord from an open area of neural tube, but not by overgrowth of neural tissue.
(6) By 7 days, notochordal uptake is markedly diminished, and no uptake of isotope occurs from 8 days onward.
(7) It first forms on the lateral portion of the neuroepithelium of the neural folds and then extends ventrally into the region adjacent to the notochord; (ii) BL becomes continuous beneath the epidermal ectoderm (EE) that overlies the NC cell region only during the terminal stages of NC cell emigration; (iii) BL does not form over the dorsal portion of the neural tube until NC emigration is terminated; and (iv) the morphology of the BL changes as development proceeds.
(8) Although they are presumed to arise from congenital notochordal remnants, it is rare for these tumors to present in childhood.
(9) Six chordomas, ten fetal notochords and eight adult notochords were stained for keratin, vimentin, GFAP, desmin, CEA, EMA and s-100 protein.
(10) A "diffuse pattern" that was seen in the histological appearance of 4 cases of the chordoma, including 2 cases with metastases, was not observed in the notochord and was considered to indicate the malignant nature of such chordoma.
(11) The results lead to the assumption that the early embryos already possess cholinergic receptors, probably located in the notochord.
(12) Adjacent to the caudal half of each somite, these cells penetrated no further than the myosclerotomal border, but opposite the rostral somite half, they were found next to the sclerotome almost as far ventrally as the notochord.
(13) These results indicate that 1) Engrailed-2 expression is suppressed in the most ventral neural tube owing to induction of the floor plate by the notochord, and 2) that the presence of an underlying notochord is not required for correct rostrocaudal expression, suggesting that multiple pathways act in the patterning of the rudiment of the central nervous system.
(14) Neural induction through the presumptive notochord was tested by means of the sandwich method.
(15) The notochord and neural tube are well developed by 3 days and surrounded by sclerotome, myotome, and dermatome cells.
(16) Minute fragments of the notochord of Balanoglossus sp.
(17) Glycosaminoglycans (GAG) are found primarily in the dorsal fin and in the ECM surrounding the notochord.
(18) Based on these facts, it is to be concluded that it is not the inducer of notochord, but the surrounding mesenchyme that is of primary importance for the determination of the types of neural tissue.
(19) A floor plate-specific chemoattractant was used as a marker to examine the role of the notochord in avian floor plate development.
(20) 2G9 was used to show that both notochord and somites are capable of neural induction, and the stimulus is present as late as stage 22.