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Biomedical subjects

G C Martinez

Publications and source records attributed to G C Martinez.

4 recordsLinked to original sources
PubMed1991

Congenital absence of the nose and nasal fossae.

We describe a case of complete nasal agenesis and absence of the nasal fossae, without alterations in the central nervous system. The physical and intellectual development of the infant to date has been absolutely normal. Opening of the nasal respiratory passage was not required in our patient as he did not show respiratory problems during deglutition. - Microphthalmia in the right eye with iridoretinal coloboma and right cryptorchidism were also noted. When the child was 9 months old a right orbital asymmetry became evident due to a growth deficit of the microphthalmic eye. This improved after placement of an expandable prosthesis in the orbit to stimulate its growth. - When the child is 4 years old, he will start to use a nasal prosthesis supported by implantology. Final reconstruction of the nasal pyramid will take place after he is 15 years of age.

Child, Preschool↗
PubMed1988

Permeability of the human round-window membrane to cationic ferritin.

An ultrastructural study was done in three sequential steps to determine if the human round-window membrane was permeable to macromolecules. Cationic ferritin was first placed for one hour in the round-window niche of two live rhesus monkeys. The same tracer was then placed in the same manner in two rhesus monkeys that had been dead for one hour. In both groups, cationic ferritin was observed to traverse the round-window membrane through pinocytotic vesicles into the scala tympani. After establishing that the transport capabilities of the round-window membrane of the monkey remained present one hour after death, cationic ferritin was placed for one hour in the round-window niche of two humans who had been dead for 30 minutes and one hour. The tracer was observed to traverse the round-window membrane through pinocytotic vesicles into the scala tympani in both humans. This report may be the first to document morphologically the permeability of human round-window membranes to macromolecules.

Animals↗
PubMed1986

Effect of life in industrialized societies on hearing in natives of Easter Island.

In an effort to determine whether life in industrialized societies can have an effect on hearing, 90 natives from Easter Island over 45 years old were evaluated. They underwent complete clinical and audiological assessment and were divided into groups according to those having lived only on the island or those having lived in modern civilization. With all factors being equal, except exposure to modern civilization, our results showed that living in civilized societies has a significant negative effect on hearing; the severity is directly proportional to the years of exposure. The median hearing thresholds of natives always living on the island (men and women combined) was found to be similar to those of female citizens of the United States; there was no significant difference in hearing thresholds between men and women among these natives. These results suggest that there are no significant inherent racial differences nor significant inherent differences between males and females in the sensitivity of hearing. A relationship between aging and hearing was noted and interpreted as true or intrinsic presbycusis. There were no cases of otosclerosis, Meniere's disease, or exostoses of the external ear canal among natives who had always lived on the island. Pure natives were found not to be prone to otitis media in spite of having an extremely high incidence of severe upper respiratory tract allergies.

Aged↗