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Biomedical subjects

J Aznar

Publications and source records attributed to J Aznar.

At least 109 records · Page 6Linked to original sources
PubMed1983

Serum malondialdehyde-like material (MDA-LM) in acute myocardial infarction.

Serum malondialdehyde-like material (MDA-LM), as an index of lipid peroxidation, and the serum enzymes CK, CK-MB, LDH, LDH1 and, alpha-HBDH were evaluated in a group of 26 patients with acute myocardial infarction (AMI), seven with angina pectoris (AP), and in a normal control group of 94 subjects. MDA-LM values were within the normal range in AP patients, while in AMI patients a significant increase in serum MDA-LM was observed in the days following the acute event, reaching a maximum 6-8 days later, when 90% of the patients had values higher than the upper normal limit (mean +/- 2SD) of the control group. A significant correlation was found between the integrated concentration-time MDA-LM curve and the integrated serum enzymes activity curves reached during the nine days after the acute event. The "in vivo" relevance of the increased serum MDA-LM in the post-infarct period is unknown at the present, but as lipid peroxides are known to harm cellular structures and to inhibit prostacyclin synthesis, it may be of interest with regard to the long term secondary effects in AMI patients.

Adult↗
PubMed1983

Haematological and clinical data in 200 cases of thalassaemia trait in eastern Spain.

A total of 200 cases of thalassaemia trait, 102 of F thalassaemia and 98 of A2 thalassaemia were studied, evaluating haematometric, and morphological aspects of both groups. Significantly higher values were found in F thalassaemia for PCV, MCV and MCH, with 33.5% of women and 52% of men being found anaemic in F thalassaemia and 45% of women and 62% of men in A2 thalassaemia. Asthenia was usually present in A2 thalassaemia more so in women 50.9% as compared to 25% in man. Only 4% of F thalassaemia carriers were affected by asthenia. Cholecystectomy had been performed on 10% of the A2 thalassaemia group and on 5% of the F thalassaemia thamia group. Both groups show a high proportion of red cells with basophilic stippling (80%), the groups being morphologically indistinguishable. Intrafamilial segregation of Hb F values affected 22% of families carriers of F thalassaemia, whereas only 8% of families carriers of A2 thalassaemia showed segregation of HbA2 values. The values obtained in this study were compared with those of other authors.

Adolescent↗
PubMed1982

Evaluation of the soluble fibrin monomer complexes and other coagulation parameters in obstetric patients.

The soluble fibrin monomer complexes (SFMC) in 154 obstetric patients with possible disseminated intravascular coagulation (DIC) were evaluated in SDS polyacrylamide gel electrophoresis (PAGE) after precipitation with B-alanine. Other coagulation tests were performed on these patients. The patients were classified into three groups: A) patients with a clinical history of DIC (6 cases); B) patients with only the analytical alterations of DIC (35 cases); and C) patients who showed pathological obstetric diagnoses but without a clinical nor analytical history of DIC (113 cases). In the three groups, well-defined bands of less electrophoretic mobility than fibrinogen were obtained. A significant increase in the second electrophoretic band was found in group A (5.1 per cent) when compared to group C (0.5 per cent). The second electrophoretic band appeared in greater proportion in the group of patients with an unfavorable clinical evolution.

Abruptio Placentae↗
PubMed1982

Elevated lipid peroxide levels in platelets of chronic ischemic heart disease patients.

A significantly higher platelet malondialdehyde-like material (MDA--LM) content after physical and N-ethylmaleimide (NEM) stimulation is found in chronic ischemic heart disease (CHD) patients when compared to the control group. In subjects under aspirin treatment "in vivo" (1 gr/day) no difference is found between CHD and control group. It is suggested that the enhanced amount of lipid peroxides in CHD platelets is produced by a cyclooxygenase-dependent mechanism. This enhanced platelet lipid peroxide production in CHD may be another platelet-dependent risk factor for atherosclerosis in these patients.

Anticoagulants↗
PubMed1982

Platelet BTG release in vitro induced by mechanical and chemical stimulus: correlation with the aggregation curve parameters.

The in vitro release of B-thromboglobulin (BTG) from platelets after stirring the platelet rich plasma (PRP) 5 min (37 degrees C/1000 rpm) was studied in a group of 13 healthy subjects before and after 'in vivo' aspirin ingestion, 1 g/d for 3 d. A significant reduction in the platelet BTG release (31%) was observed after aspirin ingestion in comparison to the pre-aspirin values, suggesting that the BTG release by stirring is related to a platelet activation process. Small doses of collagen (0.625 microgram/ml) and thrombin (0.1 U/ml) always released platelet BTG, whether or not there was a visible platelet aggregation, suggesting that platelet activation is not necessarily followed by visible platelet aggregation. A significant correlation was found between the BTG released by stimulation with collagen (2.5 microgram/ml) and thrombin (0.2 U/ml) and the maximum velocity and intensity of the aggregation curve parameters.

Adult↗
PubMed1982

Meningitis due to beta-lactamase-producing Haemophilus influenzae: successful treatment with cefuroxime.

We have studied the clinical efficacy and pharmacokinetics of cefuroxime in 3 children aged 5, 7 and 10 months who were suffering from meningitis due to Haemophilus influenzae group b (beta-lactamase producers). The MICs of chloramphenicol against these three beta-lactamase-producing H. influenzae isolates were 8, 3.1 and 16 micrograms/ml, and those of cefuroxime were 0.25, 0.5 and 0.12 microgram/ml, respectively. The dosage of cefuroxime was 100 mg/kg/day divided in four 6-hourly intravenous doses for 15 days, and 10 mg given intrathecally every 48 h. Blood and spinal fluid levels were determined by microbiological assay. All the 3 children had excellent clinical and bacteriological responses with negative spinal fluid cultures after 48 h of treatment.

Cefuroxime↗
PubMed1982

Factor XII-induced fibrinolysis. Diminished proactivator activity and drastic reduction of activator activity in Fletcher factor-deficient plasma gamma globulin.

Fibrinolytic studies in gamma G fractions of three Fletcher factor-deficient plasmas (functionally deficient in prekallikrein) revealed weak or no factor XII-independent activator activity. Two of the three Fletcher trait patients showed no plasminogen activator activity in clot lysis, fibrin plate, and amidolytic assays. The third patient showed no activator activity as determined by clot lysis and amidolytic assays but gave 10% of the activator activity detected in normal undiluted gamma G fraction in absence of HFf when determined by fibrin plate assay. Normal plasma gamma G fractions showed detectable and significant plasminogen activator activity. These fractions did not contain kallikrein or activated factor XI activities, thus indicating that the activator activity could not be attributed to the presence in these fractions or trace of these activated factors. Furthermore, factor XI-deficient plasma gamma G fraction, which was shown to contain no activated prekallikrein, showed normal plasminogen activator activity. Finally, specific antibodies to prekallikrein were shown not to quench the activity of plasminogen activator present in normal plasma gamma fraction. A double genetic deficiency to explain the absence in Fletcher factor-deficient plasma gamma G fractions of both prekallikrein proactivator and activator activities is not likely. Thus plasma prekallikrein, besides being a known plasminogen proactivator, appears to be required for the expression of a plasminogen activator activity.

Electrophoresis, Polyacrylamide Gel↗
PubMed1981

Heterogeneity of human prekallikrein deficiency (Fletcher trait): evidence that five of 18 cases are positive for cross-reacting material.

We studied the plasma of 18 patients with a functional deficiency of plasma prekallikrein (Fletcher trait). Samples from 13 subjects contained less than 1 per cent of normal levels of prekallikrein antigen recognized by a specific antiserum (cross-reacting-material negative [CRM-]). In the five other subjects, however, nonfunctional material immunologically indistinguishable from normal prekallikrein was detected by radioimmunoassays at concentrations of 13 to 30 per cent (CRM+ variant). None of the plasma samples contained detectable circulating anticoagulants against prekallikrein. On immunodiffusion against antiserum to kallikrein, each of the five CRM+ samples formed a single precipitin line of complete identity with normal plasma or purified prekallikrein. On immunoelectrophoresis, the precipitin line had the same mobility as that for normal prekallikrein. These studies demonstrate the molecular heterogeneity of human prekallikrein deficiency and show that persons with the CRM+ variant have a nonfunctional form of prekallikrein in their plasma.

Blood Coagulation Disorders↗
PubMed1981

Homozygous form of the Pelger-Huët leukocyte anomaly in man.

A report on a new case of Pelger-Huët (PH) leukocyte anomaly in the homozygous form in an 18-month-old girl is presented. Clinically, the proband shows no special symptoms dependent on the leukocyte anomaly, but polydactyly affects both hands (six fingers on one hand) and feet (six toes on both feet). Her pedigree reveals the existence of three couples in which both husband and wife are heterozygous carriers of the PH anomaly. Study of the family lineage suggests that transmission of the leukocyte anomaly is prevailingly dominant in nature with complete penetration and variable expression.

Female↗
PubMed1981

Evaluation of the monocyte channel of the Hemalog-D: correlation with visual microscopy.

Poor correlation between Hemalog-D and standard microscopy monocyte counts has been reported. To achieve a better correlation between the monocyte figures of the two systems, the Hemalog-D includes an alarm signal: the remainder. The machine monocyte count can be adjusted to approach the visual count: if the remainder is greater than +5, add the machine remainder to the machine monocyte count; if the remainder is between -5 and -10, subtract the machine remainder from the Hemalog-D monocyte count. This simple addition or subtraction of remainders expands the range of white cell differential counts which can be accepted from the Hemalog-D without subsequent visual microscopic study of blood films.

Eosinophils↗