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Biomedical subjects

J E Hernández

Publications and source records attributed to J E Hernández.

14 recordsLinked to original sources
PubMed1999

Panorama of acute diarrhoeal diseases in Mexico.

We examined the recent panorama of ADD related deaths in Mexico in an effort to assess the overall impact of control measures that may vary in space and time. We pay particular attention to mortality rates recorded between 1985-1995, that is, before and after the cholera emergency. The aim is to focus on the social groups at risk, using time series data represented in the form of images and produced by a geographic information system (GIS). We show the potential of such methods to define populations at risk and support the decision process.

Acute Disease↗
PubMed1996

Nosocomial infection due to Vibrio cholerae in two referral hospitals in Guatemala.

We report nosocomial infection with Vibrio cholerae 01, in four seriously ill individuals and one infant in Guatemala. Nosocomial cholera occurs in developing countries in Latin America and should be suspected in hospitalized patients with diarrhea, especially during community outbreaks, in order to institute appropriate diagnostic, therapeutic, and control measures.

Adult↗
PubMed1996

[Tonsillar hamartoma].

Reporting the case of a young woman, 25, with long lasting dysphagia. At examination a pediculated polypoid formation in the lower pole of the left amygdala is verified (3 x 2 cms). After removal, under local anesthesia, is diagnosed as an hamartomatous tonsillar polyp. Review of the literature, analysis of several etiopathogenical theories and differential diagnosis with other resembling amygdaline conditions.

Adult↗
PubMed1996

[Inflammatory pseudotumor of the parotid gland].

An inflammatory pseudotumor is a rare clinicopathologic condition of unknown etiology and benign course, mimicking sometimes other malignant entities under the clinic and pathologic viewpoint. Our case sitting inside the left parotid salivary gland in an 70-year-old male, was at first diagnosed as epidermoid carcinoma and consequently operated. The biopsy disclose in the mass removed a pseudotumor measuring 3 cm diameter not malignant, lodging inside a microscopic growth of Warthin type. Revue of the literature, of diagnostic findings and mode of management, suggering besides its possible etiopathogenic relation with the inflammatory pseudotumor.

Aged↗
PubMed1996

[Late centronuclear myopathy: autosomal dominant form].

We report a family with three generations affected by an autosomal dominant centronuclear palsy. This gene is characterized by ptosis that begins in childhood and a slowly progressive weakness that starts in the second decade of life, involving face, neck and limbs. In this stage, muscle pan associated to exercise or cold muscle spasms may appear. The gene is expressed with differing intensity in each individual. Myopathic electromyographic alterations are only found in functionally impaired subjects. Muscle biopsy shows type I fiber atrophy and central nuclei in a high percentage of fibers, specially in type I fibers.

Adolescent↗
PubMed1995

[Quadriceps myopathy: a type of late focal dystrophy in a case].

A 62 years old male with a slowly progressive focal myopathy is presented. He had noticed weakness in the lower limbs for three years and weakness in the upper limbs for one year. He had bilateral atrophy of quadriceps and biceps muscles, absence of knee jerks and hypertrophy of the calves. Needle EMG showed myopathic motor units. Hystological study was compatible with muscular dystrophy. The clinical and laboratory characteristics of this patient are in keeping with what has been described as "Quadriceps Myopathy" as a form of a muscular dystrophy.

Biopsy↗
PubMed1994

[Malherbe's calcifying epithelioma (pilomatrixoma) of the cervical middle line. A case report].

Calcifying epithelioma of Malherbe (Pilomatrixoma) is a rare benign tumor, starting in the hair matrix and clinically resembling a hard subcutaneous swelling. The most common sites of localization are the head and neck regions. Women show a sizeable incidence. We report a case located in the prelaryngeal area and emphasize cytodiagnostic by fine needle aspiration. The correct treatment consists in pure and simply surgical excision under local anesthesia.

Adolescent↗
PubMed1993

Dynamics of population densities and vegetation associations of Anopheles albimanus larvae in a coastal area of southern Chiapas, Mexico.

Spatial and seasonal variations on Anopheles albimanus larval densities and their plant associations were investigated in larval habitats in southern Mexico between April 1989 and May 1990. Thirty-four plant groups were dominant in larval habitats. Dense larval populations were associated with 3 genera of plants, Cynodon, Echinocloa and Fimbristylis and no larvae were found in habitats with Salvinia and Rhizophora. Low significant positive or negative associations were documented with the other 12 plant genera. Larval habitats were classified according to the morphology of their dominant plants. Higher larval densities were observed in the groups characterized by relatively short emergent vegetation. The distribution of habitat-types within 5 identified vegetation units showed a significantly dependent relationship. For the entire study period, highest larval densities were detected in flooded pasture/grassland vegetation units. For all vegetation units, higher larval densities were found when the dominant plant type covered between 25-50% of the breeding site. The integration of data from habitat-types into vegetation units did not result in loss of information.

Animals↗
PubMedDate not supplied

[A computerized system for the detection of fragmentations in depolarization. I].

It was developed a computer system which allows the amplification, digitalization, signal averaging and analysis of the: time domain, first derivative and fast Fourier transform of the ECG signal. Through this methods it was possible to detect late-potentials that arise from morphologically altered myocardium with abnormalities in the conduction velocity. To validate the system 28 studies were done in 15 normal subjects (Group 1), ten in patients with recent or old myocardial infarction (Group 2), and 3 studies in patients with myocardial infarction and sustained ventricular tachycardia during the coronary care unit stay or documented by ambulatory electrocardiogram (Group 3). Of the 31 variables documented of the time domain, first derivative and frequency domain, the RMS voltage of the last 40 msegs. of the filtered QRS al 25 Hz., the crossings through the base line of the first derivative in lead Y and the RMS voltage of the last 40 msegs. with the fast Fourier Transform analysis, from 3.9 to 304.7 Hz., allowed the identification of patients in group 3 from group 1 (p less than 0.0001). By the other hand, the RMS voltage of the first derivative in lead Y, the peak to peak amplitude of the first derivative in lead Z and the RMS voltage of the first derivative in lead Z differentiate group 3 from group 2 (p less than 0.002). It is concluded that the first derivative, the frequency domain and the time domain, in this sequence, are useful in the identification of late potentials in the terminal portions of the filtered QRS.

Adult↗