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Biomedical subjects

G Martinez

Publications and source records attributed to G Martinez.

At least 127 records · Page 7Linked to original sources
PubMed1987

Small for dates: evaluation of different diagnostic methods.

Ninety-four high-risk pregnancies were studied weekly in a prospective and longitudinal study. Uterine height, biparietal diameter (BPD), cranial perimeter (CrP) and abdominal perimeter (AbP) were measured. Amniotic fluid volume (AFV) was assessed. Of the sample selected, 58 neonates were appropriate for gestational age and 36 were small-for-date (17 symmetrical and 19 asymmetrical). The sensitivity values in diagnosis of small-for-dates were: 67% for BPD, 42% for CrP, 94% for AbP, 56% for Uterine Height and 28% for AFV. The specificity for the five variables ranged from about 91% to 100%. If we consider symmetrical and asymmetrical retardation separately, the sensitivity values for the former were: 94%, 77%, 100%, 77% and 24% for BPD, CrP, AbP, Uterine Height and AFV respectively. For symmetrical retardation, the sensitivity values were: 43%, 11%, 90%, 37% and 32% for BPD, CrP, AbP, Uterine Height and AFV respectively. The fetal cranial measurements were the only ones to demonstrate a different pattern of evolution in symmetrical and asymmetrical small-for-dates. This is therefore a useful measurement in making a differential diagnosis between both retardations. The earliest diagnoses were made in the symmetrical small-for-date group.

Female↗
PubMed1987

Human beta-globin gene HpaI polymorphism in the non-white Cuban population.

The frequency of the association between the beta A, beta S and the beta C genes with the 13.0 kb HpaI restriction fragment has been determined in 72 non-white individuals with different hemoglobin phenotypes giving a value of 0.00 for the beta A gene, 0.52 for the beta S gene and 1.00 for the beta C gene. These data indicate that this association in the Cuban non-white population is similar to that reported for the American Blacks living in the U.S.A. East Coast and for the French West Indies.

Adolescent↗
PubMed1986

Molecular characterization of HbH disease in the Cuban population.

Molecular characterization of the alpha-thalassemia mutations present in nine HbH subjects from Cuba was achieved by digestion with Bam HI, Bgl II, and Apa I and hybridization with alpha- and zeta-specific probes. The results show that the molecular basis of the genetic defect is quite homogeneous, all the subjects carrying the - alpha 3.7 type I/--SEA genotype. Variations are observed in the size of the zeta polymorphic fragments.

Cuba↗
PubMed1986

Interuniversity microscopic slide exchanges: a mechanism for peer review and continuing education in oral pathology.

One thousand seven hundred and three consecutive cases from a microscopic slide exchange with 10 institutions were evaluated for extent of agreement (or disagreement) defined as: A) complete agreement (85.8%). B) Disagreement--difference in diagnostic terminology, no significant pathologic or clinical implications (1.4%); C) disagreement--difference in diagnosis with pathologic significance only (7.7%); C1 disagreement--difference in diagnosis with pathologic significance only, radiographic interpretation necessary (1.1%); D) disagreement--major significance for prognosis and/or treatment (4.0%). Trends in disagreement were identified in the following tissue/location categories: mesenchymal lesions, minor salivary gland tumors, odontogenic tumors, fibro-osseous lesions, and benign epithelial lesions. These are discussed in relation to the oral pathology literature. All disagreements with significance for prognosis and/or patient treatment were evaluated retrospectively in an attempt to resolve the disparities. The implications for peer review, continuing education, and teaching programs are addressed.

Diagnosis, Differential↗
PubMed1985

Linkage of the alpha G Philadelphia locus to alpha-thalassemia in the Cuban population.

The inheritance of the alpha-chain hemoglobin variant G Philadelphia was studied in three Cuban families of African ancestry. The variant represented approximately 33% of the total adult hemoglobin in all subjects, and was associated to a 10.5 kb Bam HI restriction fragment. Mild hematological alterations were present. These data indicate that also in the Cuban population the alpha G Philadelphia locus is linked to a deletional alpha-thalassemia.

Adult↗
PubMed1984

Dense cells in sickle cell anemia: the effects of gene interaction.

In an attempt to uncover potential genetic sources of the clinical diversity of sickle cell anemia, we have characterized homozygous SS patients in the following ways: percentage of dense red blood cells (% F4) as determined from Percoll-Stractan continuous density gradients, alpha gene deletion, average percentage of hemoglobin F (% HbF), hemoglobin in g/dL, age, and sex. We find that alpha 4 individuals have a higher % F4 (mean 24% +/- 15%) than alpha 3 individuals (mean 12% +/- 8%) (P less than .005). Multivariate analysis demonstrated a significant correlation among % F4 levels and alpha-gene number and % HbF, and an interaction between the last two variables. The other variables considered did not significantly alter this model. As reported before, with fewer samples, we find that in the first ten years of life of SS individuals, the frequency of alpha gene deletion is 17%, which is comparable to that in the general black population, while in the group over 20 years of age, the frequency rises to 49%, implying that alpha thalassemia is associated with longer survival. These results indicate that it is necessary to consider sickle cell anemia not only as a single gene defect, but also as a disease whose clinical expression is the result of a group of genes capable of interacting at the phenotypic level.

Adult↗
PubMed1983

[Correlations between coronary and ventricular angiography and the exercise test after myocardial infarction].

The aim of this study to assess the predictive value of exercise stress testing (ET) compared with coronary angiography-left ventriculography (CLV) in 102 patients undergoing physical rehabilitation (PH) after myocardial infarction (MI). The ET was optimised in its performance by the PH and in its interpretation by the selection of the parameters according to the site of MI. In anterior MI, angina (30%) and ischemic ST depression outside the acute period (35%) had little predictive value of multivessel disease which was demonstrated in 40% of cases; on the other hand, ST elevation in the same area as MI (65%) had an 88% predictive value for severe LV impairment which was found in 66% of cases. In inferior MI, ischemic ST depression (75%) more than angina (27%) was of greater predictive value (82%) for multivessel disease which was demonstrated in 59% of cases. The sensitivity was 97% and the specificity 64%; the LAD artery was diseased in 48% of cases. LV function was preserved in 63% of cases, but ET was not useful in the prediction of this parameter. In all cases of MI, the absence of ST changes predicted single vessel disease in 94%; ventricular arrhythmias (5%) stopped the patients reaching a discriminative exercise level but indicated poor LV function. The extreme values of heart rate and double product improved the correlations between ET and CLV. Therefore, ET may provide some of the information of CLV before the usual evolutive criteria and may help avoid this investigation in patients with favourable results, especially with inferior infarction. Although it has no absolute value, systematic ET is justified after MI as it enables the most severe cases to be distinguished from the most benign.

Adult↗