Biomedical subjects

J Mercier

Publications and source records attributed to J Mercier.

At least 217 records · Page 12Linked to original sources

PubMed1984

Rhythmic circumnutation movement of the shoots in Phaseolus vulgaris L.

The apex of growing stems in twining plants describes a rhythmic movement in space called circumnutation. By the method of orthogonal projections, the position in space of the apex can be determined constantly. The mathematical analysis of data allowed us to determine that for Phaseolus vulgaris L. (cv. Mangetout Blanc de Juillet) grown under constant illumination and temperature (25 degrees C) the period is about 100 min. This movement has been related to rhythmic changes in the osmotic potential of the cells located in the bending zone of the stem for a constant period. These variations are longitudinally and laterally coordinated. Treatment with a solution of LiCl at 7 X 10(-3) M supplied to the root system induces a lengthening of the period. The effect of the treatment is reversed by K+ ions. From these results we deduce that rhythmic changes of the membranes are implicated in the circumnutation movements of twining plants.

Chlorides↗

PubMed1984

[Sagittal osteotomy of the mandibular ramus. Anatomical and technical considerations. Apropos of 2 complications].

Two patients developed complications, one a facial palsy and one a carotid artery pseudo-aneurysm, following sagittal osteotomy of the rami of the mandible, as previously described by Trauner - Obwegeser and Dalpont . The responsibility of compressive phenomena provoked by mandibular retraction in the appearance of these complications is evoked, together with the risk of recurrence. To avoid this compression of retromandibular soft tissues a technique of sagittal osteotomy of the rami of the mandible is performed, based on the lines first described by Dalpont in 1961 and adopted by Epker in 1977. This well-founded procedure is a result of applying the anatomical structure of the mandible and its muscle insertions to the development of the surgical procedure.

Adolescent↗

PubMed1984

[Anesthetic aspects of the primary treatment of labio-maxillo-palatal clefts].

This study of 97 operations discusses our anaesthetic experience for labio-maxillary clefts and the problems which arise for the anaesthetist during pre-inter and post surgical periods. This type of functional surgery is carried out on children between 4 and 23 months old, of which 22% presented with associated malformations. Paediatric anaesthetic characteristics in a maxillo-facial context are discussed in detail. We indicate the importance of installing the different surveillance elements before placement of the surgical fields. We treat the problems of drug interactions between the halogenic anaesthetics and vasoconstrictor used for local haemostasis, the limits of spontaneous ventilation and the secondary metabolic consequences of prolonged fasting.

Abnormalities, Multiple↗

PubMed1983

Differential diagnosis of hypertrophic cardiomyopathies: typical (subaortic) hypertrophic obstructive cardiomyopathy, atypical (mid-ventricular) hypertrophic obstructive cardiomyopathy and hypertrophic non-obstructive cardiomyopathy.

Previous clinical studies in patients with hypertrophic cardiomyopathies predominantly comprised patients with typical subaortic HOCM and in many other studies patients with 'hypertrophic' cardiomyopathies were investigated; i.e. no distinction was made between patients with the typical obstructive, the atypical obstructive and the non-obstructive forms of hypertrophic cardiomyopathy. In addition, in the more differentiated studies, the differential diagnosis between HOCM and HNCM was based mainly on the presence and absence of the subaortic pressure gradient. This is also true for the clinical characterization of both types of hypertrophic cardiomyopathy. Finally, diagnostic descriptions of atypical (mid-ventricular) HOCM exist only in the form of case reports, i.e. they are not based on observations in a large number of patients. Therefore a comparative study in 353 patients with hypertrophic cardiomyopathies was designed to characterize the clinical picture of patients with HNCM and with atypical HOCM in relation to typical HOCM with special reference to the differential diagnosis. The study revealed a profoundly different diagnostic profile of the three subsets of hypertrophic cardiomyopathies. The distinction between the three subsets may serve as a more differentiated basis for clinical studies related to diagnosis, therapeutic approaches, long-term follow-up observations and prognostic evaluation of patients with hypertrophic cardiomyopathies.

Adolescent↗

PubMed1983

[Clinical aspects, course and prognosis of various forms of hypertrophic cardiomyopathy].

To characterize the different types of hypertrophic cardiomyopathy [typical (subaortic) hypertrophic obstructive cardiomyopathy (HOCM) (n = 235), atypical (midventricular or apical) HOCM (n = 33), and hypertrophic nonobstructive cardiomyopathy (HNCM) (n = 85)], studies of the clinical picture, course, and prognosis were performed in 353 patients. Clinical picture. There were found to be distinct differences between the diseases in terms of incidence, symptoms, findings at auscultation, carotid pulse tracings, ECG (incidence of abnormal negative T-waves), and echocardiography. Echochardiography proved to be diagnostically less specific than invasive methods, however, and in particular often failed to distinguish between atypical HOCM and HNCM. Clinical course. There was no evidence of a change from one form of hypertrophic cardiomyopathy to the other. The Sokolow-Lyon index in the ECG did not increase in any group. The rate of complications (endocarditis, systemic emboli) varied between 0.61 and 1.28 events per 100 patient years. Only 7.4%-23.5% of patients with HOCM improved as a result of conservative treatment, compared to 83%-87.5% of surgical patients. In addition, the rate of postoperative syncope was reduced by 90%. Prognosis. 90 patients were operated on. Operative mortality in typical HOCM was 4.5% over the last 5 years. If this is disregarded, the cumulative survival rates are significantly higher in surgical patients with typical HOCM than in those treated conservatively. The data confirm surgical treatment to be the therapy of choice in patients with HOCM refractory to conservative treatment. The prognosis seems to be improved by operation.

Adult↗

PubMed1983

[Romberg's syndrome. Progressive facial hemiatrophy].

Romberg's syndrome or progressive facial hemiatrophy is a rare affection that may nevertheless be encountered by stomatologists during the course of their professional life. Diagnosis is simple if clinical and radiographic signs are recognized, an effective iconography being of particular value. This report is concerned mainly with the latter feature, and also includes a description of the principal characteristics of the affection and an extensive bibliography.

Adolescent↗

PubMed1983

[Cranial manifestations of Recklinghausen's disease. A case report].

A typical case of Recklinghausen's disease is presented, and the various cephalic manifestations and prognosis discussed. A close relation exists between neurofibromatosis and neural crest lesions.

Adult↗

PubMed1983

[Temporomandibular arthoplasty for ankylosis. Apropos of 4 cases].

Four patients with temporomandibular ankylosis were treated according to the same therapeutic concepts, and good results were obtained. This was due to the surgical technique employed which respects meniscal elements and conserves or reconstructs the ascending ramus length, and to postoperative mobilization in mandibular propulsion and lateropulsion (by means of elastic tractions or palatine plate) over a period of several months.

Adolescent↗

PubMed1983

[Seckel's syndrome (or bird's head dwarfism). Apropos of a case].

A 13-year-old boy presented with Seckel's syndrome, still called bird's head nanism, characterized by: --nanism, mental retardation, microcephaly, and protrusio of the middle third of the face. The typical facial appearance enabled a detailed study to be conducted of both clinical and radiological features, including, particularly, an architectural and structural analysis of profile teleradiographic images, providing objective data on the craniofacial deformities. Skeletal and systemic anomalies are also described, together with elements documented in the literature but absent in the present case. The etiology of this syndrome remains unknown.

Adolescent↗

PubMed1982

[Relations between sinus aspergillosis, primary rhinoliths and dental pathology].

Sinus aspergilloses, which can be classified as aspergillar sinusitis and pseudo-tumoral forms, are probably much more prevalent than would appear form the published literature. Many cases of caseous sinusitus reported since the end of the last century were probably unrecognized aspergillosis infections. In the same way, primary rhinoliths can probably be related to aspergillosis. Many cases of sinus aspergillosis appear to be of dental origin, particularly when radiography detects the presence of dental obturation paste in the sinus opacity: this appearance in the sinus opacity: this appearance is almost pathognomic of the affection. Sinus aspergillosis should be recognized as recovery can be obtained in the majority of cases by simple sinus washouts, without the need for chemotherapy.

Adult↗

PubMed1981