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Biomedical subjects

G Nicolas

Publications and source records attributed to G Nicolas.

216 records · Page 12Linked to original sources
PubMedDate not supplied

[Electroencephalographic changes in patients with cardiopathies, subsequently operated under extracorporeal circulation. Significance and outcome. Evaluation of 679 cases].

This study analysed the pre-operative electroencephalographic recordings of 679 patients with heart disease, later undergoing surgery under extra-corporeal circulation. The type and the severity of the abnormalities are listed for each heart disease. These results are compared to those already published in the literature on this subject and are discussed in terms of a number of possible aetiological factors: the age of the patients, data provided by the pre-operative cardio-pulmonary assessment. This analysis does not enable us to demonstrate, with any statistical significance, the aetiological factor(s) of these electroencephalographic alterations. Finally, comparison of the pre-, intra- and postoperative EEG in the same patients enables us to evaluate the prognostic value of these electrical abnormalities.

Adolescent↗
PubMedDate not supplied

[Blood pressure profile in effort and recuperation in the sportsman].

105 male sportsmen, children, adolescents, adults and veterans, performed a standardized stress test, seated on an ergometric bicycle. The HR/BP ratio was studied during effort and during 6 minutes of recuperation. The level of effort achieved was excellent in each age group, reflecting the value of regular physical training: 187 W in the 13--15 year olds, 274 W in the 16--18 year olds and 20--30 years olds and an excellent level of 206 W in the 60 year old veterans. The stress blood pressure profile in children and adolescent sportsmen is identical for superior performance to that seen in the young sedentary subject. Starting in the 16--18 year old group, we find a blood pressure profile comparable to that seen in other sportsmen. Adult and veteran sportsmen have a blood pressure profile similar to sedentary adults, for superior performance. The 6 minute recovery period allows us to examine: the change in the HR which remains higher than rest values (= 100) independent of age, and the maximal HR attained, as well as the return to normal of the blood pressure figures, which always returned to their initial value, whatever value was obtained on maximal effort. A pathological blood pressure profile is defined as an abnormal elevation during effort and an absence of normalization during the 6 minute recovery period.

Adolescent↗
PubMedDate not supplied

[Cytochemical and freeze-etching studies of the ultrastructure of a Rickettsiella in a crustacean (author's transl)].

Several characteristics of the intracellular cycle of Ricketsiella are elucidated, particularly regarding the envelope and the cytoplasm of dense forms (elementary bodies) as well as the proteinic inclusions of giant bodies. Cleavage faces have been displayed by freeze-etching, both at the level of cell wall and of plasma membrane. Their characteristics approach those of Gram-negative bacteria and are pratically common to all the stages. Appearance and significance of a polysaccharidic cement joining the outer membrane of the cell wall to the inner membrane (plasma membrane) in the dense forms are discussed. The arrangement of ribosomes and the structure of the nucleoid are described. A 6 nm lattice periodical structure is shown in the proteinic inclusion. Significance of these data for a classification of Rickettsiella and chlamydias is discussed.

Animals↗