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Biomedical subjects

L Durán

Publications and source records attributed to L Durán.

8 recordsLinked to original sources
PubMed1997

Cardiopulmonary and haemodynamic changes during total hip arthroplasty.

We report a prospective study of 30 patients who underwent total hip arthroplasty for osteoarthrosis in order to investigate the haemodynamic and respiratory changes which occur during operation. Cement was used in 17 cases and the implants were not cemented in 13. Pulmonary and cardiac function, blood levels of methylmethacrylate monomer, intramedullary pressure and transoesophageal echocardiography were recorded. Two well differentiated echogenic patterns appeared consistently during the operation. The intramedullary pressure became raised as the cement was inserted. The following changes occurred within seconds and continued for some minutes: elevation of mean arterial pressure and mean pulmonary artery pressure; decrease of arterial oxygen tension and of mixed venous PO2, and greater tissue consumption of oxygen. Although we recorded raised concentration of methylmethacrylate monomer in venous blood after the cement was inserted, there is no evidence that the monomer is responsible for the haemodynamic changes which take place.

Aged↗
PubMed1994

[Teaching of health economics in Mexico: 5-year experience].

Teaching strategies for a new specialty constitute a challenge to ensure the rapid development of human resources for the purpose of supporting these activities. In the health economics field a plan was applied for coping with the needs of teaching activities in the field. The activities developed in the plan are presented in this paper, included under the following items: A. Theoretical organization of the contents of the subject. B. Organization of contents according to the students' needs. C. Support given to teachers. D. The whole strategy also includes: academic interchange, technical advisory services, dissemination of results through meetings, publications and academic organizations. E. Median term agenda: Human resources; Financial resources; Teaching strategies; Interaction between health services and decision makers; and Collaborative network.

Curriculum↗
PubMed1979

Neurophysiological and neurochemical studies on the action of the anticonvulsant gamma-hydroxy, gamma-ethyl, gamma-phenyl-butyramide.

The effect of gamma-hydroxy, gamma-ethyl, gamma-phenyl-butyramide (HEPB) on afterdischarges produced by hippocampal stimulation in cats was studied. HEPB notably diminished the duration of afterdischarges and in some cats blocked their propagation into the substantia nigra and the amygdala. HEPB treatment also antagonized the enhancement of afterdischarge duration produced by subconvulsive doses of bicuculline, whereas treatment with diphenylhydantoin strongly potentiated this effect of bicuculline. The intracisternal injection of HEPB or gamma-aminobutyric acid (GABA) in mice resulted in a potentiation of strychnine-induced convulsions. On the other hand, neurochemical experiments in mouse brain cortex slices and in synaptosomes demonstrated that HEPB did not affect the high affinity uptake of [3H] GABA, its spontaneous or Ca2+ dependent release stimulated by depolarizing K+ concentrations, and its Na+ independent binding to synaptic plasma membranes.

Amygdala↗
PubMed1976

Convulsions or flaccid paralysis induced by ruthenium red depending on route of administration.

Ruthenium red was administered to mice and cats intracranially or intraperitoneally. In mice, intracisternal administration produced status epilepticus and tonic convulsions. In contrast, intraperitoneal administration induced total flaccid paralysis lasting several hours. These effects of Ruthenium red were partially blocked by the simultaneous administration of CaCl2. EDTA, at doses much greater than those of Ruthenium red, produced effects similar to those of the dye, which were also blocked by CaCl2 administration. In cats, intraventricular or intrahippocampal administration of Ruthenium red through a permanently implanted cannula produced after a few minutes subclinical paroxysmal activity in all brain regions recorded. After several hours the animals developed typical grand mal seizures. Intraperitoneal injection of Ruthenium red to cats did not affect the EEG but markedly depressed muscular activity. Administration of carbachol to the latter animals produced myoclonic responses. These results are discussed in relation to the inhibitory effect of Ruthenium red on Ca2+ transport and binding to membranes, and to the role of this cation on neurotransmitter release.

Animals↗
PubMedDate not supplied

alpha-1-Antitrypsin phenotypes among breast cancer patients in the Basque population.

One of the main functions of alpha 1-antitrypsin (A1AT) is to inhibit the activity of most proteases. It has been suggested that a deficiency in this protein may favor invasion by cancer cells--consequently, individuals with A1AT-deficient alleles (null, S and Z) may be at greater risk of tumoral invasion due to their lower capacity of response to proteolytic enzymes. This work examines the frequencies of A1AT phenotypes in breast cancer (BC) patients. A sample of patients classified as having infiltrative ductal carcinoma was chosen to be studied as it is a highly invasive tumor, and a sample of patients with BC and a familial history of cancer has also been studied. An increase in the frequency of A1AT-deficient phenotypes was not observed in any of the three groups. One possible explanation could be the immunosuppressive activity of A1AT.

Adult↗
PubMedDate not supplied

[Evaluation of the degree of muscle blockade: a comparative study using electromyography of the muscular relaxation induced by pancuronium, atracurium and vecuronium].

To compare the muscle relaxing effect of pancuronium, atracurium and vecuronium, 99 patients operated on under neuroleptanesthesia were divided in three groups depending on whether they had received, during induction, pancuronium 0.1 mg/kg, atracurium 0.5 mg/kg, or vecuronium 0.1 mg/kg. One-fourth of the initial dose was repeated if necessary. The electromyographic study of the muscle relaxing effect was carried out with stimulation of the cubital nerve with courses of supramaximal square wave electric stimuli in 'trains of four'. The time to maximal blockade (TMB), the time of clinical effectiveness (TCE), the total duration time (TDT), the time of duration of the maintenance dose (DM 25) and the recovery index (RI) were measured. TMB was 4.3 +/- 1 min for pancuronium, 3.5 +/- 0.8 min for atracurium, and 3.3 +/- 0.98 min for vecuronium. The differences between pancuronium and the other drugs were statistically significant, but they were not so between the latter two. TCE was 67.9 +/- 13.5 min for pancuronium, significantly longer than with vecuronium and atracurium (28.2 +/- 5.7 and 31.5 +/- 4.7, respectively). TDT was 126.2 +/- 19.9 min for pancuronium, 61.2 +/- 11.5 min for atracurium and 55.5 +/- 16.7 for vecuronium. The mean duration of the repeated dose was 52.7 +/- 8.4 min for pancuronium, 19.9 +/- 5 min for vecuronium and 10.9 +/- 5 min for atracurium. RI, which was similar for atracurium and vecuronium (12.7 +/- 1.7 min and 12.8 +/- 3.3 min), was longer for pancuronium (27.7 +/- 4.3 min).

Adolescent↗