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Biomedical subjects

H García

Publications and source records attributed to H García.

At least 73 records · Page 4Linked to original sources
PubMed1989

[Interrelationship between vitamin D intake and absorption and retention of calcium during nutritional recovery].

We have previously reported that, in the first stages of nutritional recovery, the needs of undernourished infants, in terms of protein-calories percentage (P%) are higher than normal, producing an accelerated catch-up. Consequently, calcium (Ca) and phosphorus (P) balances increase proportionally to weight gain rate (WGR) in order to attain a normal body composition. As for the control of Ca metabolism by vitamin D, the question is whether vitamin D intake must also be increased during this accelerated catch-up growth period. In this report we have analysed retrospectively previous results in order to clarify the interrelationship between Ca absorption, Ca retention and vitamin D intake. A total of 29 undernourished infants, from 2 to 18 months of age, were fed Ad libitum with one of two proprietary milk formulas containing, per 100 g.: Ca, 0.50 and 1.17 g.; P, 0.37 and 0.50 g.; vitamin D, 350 and 400 UI (8.7 and 10 micrograms); proteins, 11.34 and 17.00 kcal/100 kcal of total diet, respectively. Recommended Dietary Allowances (RDA) of Ca and vitamin D, according to FAO/OMS and NRC, were calculated with reference to normal infants body weight and to 1000 kcal of recommended dietary energy intake. Ca intake was higher than the RDA and ranged between 60 and 413 mg/kg/day; intake of vitamin D increased proportionally to food intake; calcium absorption ranged between 40.0 and 92.0% (mean = 69.8 +/- 14.6) and CaB correlated with Ca intake (r = 0.97), being higher than normal.(ABSTRACT TRUNCATED AT 250 WORDS)

Calcium↗
PubMed1988

Production of specific retinal S antigen antibodies in patients with retinal detachment.

One hundred patients with retinal detachment (61 primary operations and 39 reoperations) were studied for titers of autoantibodies to human retinal S antigen using the enzyme-linked immunosorbent assay technique (ELISA). There was no statistically significant difference when comparing the group of patients with primary retinal detachment with the control group. However, a statistically significant increase in anti-S titers was recorded when a comparison was made between the group of reoperated patients and the control group (chi 2, P less than 0.001) and between the group of reoperated subjects and the group of patients operated on for the first time (chi 2, P less than 0.005).

Antibody Specificity↗
PubMed1983

Filariasis in Colombia: prevalence and distribution of Mansonella ozzardi and Mansonella (=Dipetalonema) perstans infections in the Comisaría del Guainía.

A survey was conducted to determine the prevalence and distribution of filarial infections among the inhabitants of Comisaría. Approximately 25% of the 604 individuals bled (Knott's sample) harbored microfilariae; more men (29.7%) were infected than women (23.7%); approximately 6% were infected with Mansonella (=Dipetalonema) perstans, 13% with Mansonella ozzardi, and 7% with both filariae. Mansonella ozzardi was more common in men than in women, and its prevalence increased with age in both sex groups; it was detected in most of the resident ethnic groups but was most common in the Puinave and the Curripaco Indians, and appeared to be distributed throughout the Comisaría. The prevalence of M. perstans was essentially the same in men as in women, and in age-groups from the 2nd to 4th decade, although its tendency to increase with age was not as marked as in M. ozzardi infections. Mansonella perstans appeared to be limited to the central and southern regions of the Comisaría, was found principally in the Curripaco Indians, and was detected in settlements situated within the drainage of both the Río Orinoco and the upper Río Negro. Approximately 9% of the white settlers (colonos) harbored M. ozzardi, and 5% M. perstans. These results indicate that both M. perstans and M. ozzardi are endemic in the Comisaría del Guainía, and suggest that the focus of M. perstans may extend further into the South American continent along the Río Negro and its tributaries.

Adolescent↗
PubMed1982

[The Aicardi syndrome].

The authors present a case of a girl who showed flexion spasms, chorio-retinopathy and agenesis of corpus callosum, an association known as the Aicardi syndrome. They have made a wide revision of the literature, examining in detail the clinical aspects and diagnosis with other malformations and infections. Lastly, they comment the aspects of etiology and pathology of the disease which still remain unclear.

Abnormalities, Multiple↗
PubMed1977

[Cerebral potentials related to visual stimulation. Pattern inversion and flash].

Distinguishing between electroencephalogram (EEG) and event-related potentials (ERP) as indicators of brain electrical activity, methodological considerations pertaining to the recording of ERP to visual stimulation (evoked potentials, EP) are presented. Visual EP may be either steady-state or transient, depending upon stimulation used (repetitive versus transient) and method of analysis (frequency domain versus time domain). While both have diagnostic applications, this paper concentrates on transient visual EP. Based on the contention that intra and interindividual EP variability is the single most important issue in clinical practice, it presents data comparing two widely employed techniques (checkerboard reversal and flash stimulation) with respect to their stability in normal populations and their diagnostic sensitivity in demyelinating disease.

Adult↗
PubMed1976

Electromyography of the rectum and colon in Hirschsprung's disease.

The electromyographic activity of the large bowel was studied in patients suffering from aganglionic megacolon and in comparable normal infants and children, using of an intraluminal electrode. Graphs obtained in control children showed a basic electrical rhythm of 4-6 waves/min with bursts of high frequency spikes, 3-4/sec, superimposed on the top of the slow waves. The recordings in Hirschprung's disease showed an irregular basic electrical rhythm with waves of variable duration and no high frequency potentials, as long as the electrode was positioned in the aganglionic zone. As soon as the electrode was introduced further up into the normally innervated colon the graph became identical to that seen in the normal bowel. Intraluminal electromyography of the rectum and colon seems to be a suitable procedure to diagnose aganglionosis of the rectum and the extent of the lesion.

Child↗
PubMed1974

Muscle contraction during hyperpolarizing currents in the crab.

Isolated muscle fibers from the motor legs of the crab Trichodactilus dilocarcinus were submitted to strong hyperpolarizing currents of varied intensities which produced tension during the current pulse. Threshold for tension was obtained with intensities of about 0.2 x 10(-5) A, changing E(m) to ca. -150 mV (starting from a resting potential ofca. -80 mV). At the closure of the anodic square pulse, a second phase of tension usually appeared superimposed upon the one obtained during hyperpolarization. The first phase of tension increased with the increase of Ca(++) concentration in the bath. Sr(++) produced the same type of mechanical output as Ca(++). When added to the normal Ca(++) concentration, Ba(++) and Mn(++) in low concentrations (up to 21.5 mM) also increased the tension of this phase, but at higher concentrations they blocked both phases while Mg(++) did not alter the tension. Of all the divalent cations employed, only Sr(++) is capable of developing tension as a substitute for Ca(++) in the external media. Procaine administered in a dosage (5 x 10(-3) W/V)which would suppress the contracture due to caffeine (10 mM), did not modify the tension developed during the hyperpolarization. The preceding data indicate that the Ca(++) required for tension during hyperpolarization comes from sites which would differ from those usually postulated for tension due to depolarization in the muscle fibers of other crustaceans (American crayfish). Furthermore, the external source of Ca(++) appears to be one mainly implicated in the induction of tension due to inward current pulses.

Animals↗