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Biomedical subjects

P Velásquez

Publications and source records attributed to P Velásquez.

4 recordsLinked to original sources
PubMed1997

[Spontaneous abortion: cytogenetic study of 609 cases].

Chromosomal abnormalities are the most frequent cause of first trimester spontaneous abortions (SA). During the period September 1989 through May 1996 we have cytogenetically studied 640 embryonic tissue samples obtained from cases of SA. Of these, 609 samples (95.1%) were successfully karyotyped. An abnormal karyotype was observed in 388 cases (63.7%). The sex ratio (XY/XX) was 1.03. There was no difference of this ratio between cytogenetically normal and abnormal embryos. The most frequent abnormalities detected were autosomal trisomies (239/388 [61.6%]) followed by triploidy (62 cases, 16%), monosomies (41 cases, 10.6%) and tetraploidy (17 cases, 4.4%). The single most common anomaly observed was trisomy 16 (73 cases, 18.8%). The frequency of trisomies, with the exception trisomy 16, was related with advanced maternal age.

Abortion, Spontaneous↗
PubMedDate not supplied

[Early stimulation: 10 years' experience].

Infancy psychomotor yield in lower socioeconomic levels can be damaged from the first year of life. This implies future consequences to individuals, family-and society. Early stimulation programs have demonstrated to improve psychomotor yield in the above mentioned children. In Temuco, Chile, in groups of children with different risks, that were incorporated to an early stimulation program, it has been seen that the lower the birth weight the greater the risk of future psychomotor deterioration, which is also true for children that survived neonatal meningitis. On the other hand, in children that presented hyperbilirubinemia, low Apgar scores and neonatal septicemia, no significant statistical differences in psychomotor development have been observed in comparison with those of similar birthweight but without these antecedents. In this study the Chilean Health Ministry's Evaluation and Psychomotor Stimulation Program is reviewed as to adapt it for children at greatest risk.

Child Development↗
PubMedDate not supplied

[Acquirement of the Spanish vocabulary among rural and urban students of the 9th region].

In order to test the assumption that rural children from the Araucanía region at southern Chile start school with significant handicaps in the acquirement of the spanish vocabulary when compared with their urban peers, the Peabody Picture Vocabulary Test (PPVT, spanish version) was used to compare a first group including all those children attending third grade at a public school from a low socio economic level neighborhood of the city of Temuco, Chile (n = 44, age average 9.01 years, s = 0.51) against a second group including all those children attending the same grade at three public schools from the rural areas surrounding the same city (n = 37, age average 9.07 years, s = 0.52). Previously, 19 children aged 3 to 5 years were tested both with the PPVT and with the chilean instrument for the measurement of development at the age group (TEPSI). Both scores show a positive correlation (r = 0.64, p = 0.05). Average scores for the PPVT among rural children were lower than among urban children (64.07, s = 11.36 against 103.05, s = 10.99, p = less than 0.01). In a second stage, 39 children attending 7th grade at the urban school (age average 13.61 years, s = 0.64) and 27 children of the same grade from the rural schools (age average 13.69 years, s = 0.69) were tested with the same instrument.(ABSTRACT TRUNCATED AT 250 WORDS)

Acculturation↗