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Biomedical subjects

M Olivieri

Publications and source records attributed to M Olivieri.

At least 37 records · Page 2Linked to original sources
PubMed1995

[Antiphospholipid antibodies: their prevalence, clinical significance and correlation with cytokine levels in acute myeloid leukemia and non-Hodgkin's lymphoma].

Forty-five patients with de novo acute myeloid leukemia (AML) and 22 patients with newly-diagnosed non-Hodgkin lymphoma (NHL) were investigated. Tests for antiphospholipid antibodies (APA) included the measurement of anticardiolipin antibodies (aCL) with a solid-phase immunoassay, and the detection of the lupus-like anticoagulant (LA) activity. Fifteen patients with AML (33.3%) and 9 patients with non-Hodgkin lymphoma (40.9%) presented elevated APA at diagnosis, as compared to 3 out of 174 persons of the control group (p < 0.0001). APA titles became normal in all patients responding to treatment, whereas non-responders retained elevated levels. In addition, 2 patients (1 with AML and 1 with NHL) who had normal APA at diagnosis and were either refractory to treatment or in relapse, subsequently developed LA and/or aCL positivity. At presentation, the mean levels of IgG- and IgM-aCL in patients were not significantly different from controls, and concordance between aCL and LA results reached just 12%. With regard to the clinical course, we were not able to detect any statistically significant difference between patients with normal and elevated APA. Pretreatment concentrations of IL-6 and TNF-alpha in AML, and soluble form of the receptor for interleukin-2 (sIL-2r) in NHL were found significantly elevated compared to controls (p < 0.001, p = 0.011 and p = 0.016 respectively). In addition, the levels of these cytokines correlated with IgG-aCL at the different times of laboratory investigations. These results demonstrate that APA may have a role as markers of disease activity and progression in some haematological malignancies.

Acute Disease↗
PubMed1994

Prevalence and clinical significance of elevated antiphospholipid antibodies in patients with idiopathic thrombocytopenic purpura.

Antibodies against phospholipid antigens (APA) have been demonstrated in idiopathic thrombocytopenic purpura (ITP), but their clinical and pathogenetic significance has remained elusive. In this study we analyzed the prevalence and clinical features of ITP patients with elevated APA. In addition, we prospectively evaluated APA levels after treatment with corticosteroids and compared them with platelet-associated immunoglobulin (PAIgG) titers. We studied 149 patients with newly diagnosed ITP. Of these, 78 had a platelet count less than 50 x 10(9)/L and received an initial treatment with oral prednisone (PDN). In 71 asymptomatic cases with platelet counts between 50 x 10(9)/L and 120 x 10(9)/L, no therapy was scheduled. However, in five of them, the platelet count fell below 50 x 10(9)/L after more than 12 months; these patients were treated with PDN. Tests for APA included the measurement of anticardiolipin antibodies (ACA) with a solid-phase immunoassay and the detection of the lupus-like anticoagulant (LA) activity with coagulation tests that included kaolin-clotting time, dilute Russel's Viper venom time, activated partial thromboplastin time (aPTT), and dilute aPTT. Controls consisted of 174 apparently healthy subjects. Either LA or elevated ACA was seen in 69 patients (46.3%) at diagnosis. LA and ACA were both elevated in 24 cases (16.1% of the overall patient population and 34.8% of patients with high APA concentrations). No correlation was found between LA ratio values and ACA-IgG or -IgM titers, or between ACA-IgG and ACA-IgM levels. The presence of these antibodies was not associated with sex, age, platelet count, or the severity of hemorrhages. PAIgG was detected in 106 of 127 cases (83%). Again, no relationship was observed with clinical parameters or with APA levels. However, all cases with elevated APA also had increased PAIgG. With regard to the clinical course, we were not able to detect any significant difference between patients with normal and elevated APA. An initial complete response to prednisone treatment was observed in 43 of 83 cases (51.8%), with 13 (15.7%) achieving a prolonged complete remission. APA levels were not significantly modified after PDN therapy and on relapse. We conclude that APA positivity is a common finding in patients with ITP and does not select a category with different clinical features. APA levels are not influenced by immunosuppressive therapy with steroids and are not related to the activity of the disease. Therefore, we do not support a role for APA in the pathogenesis of ITP.

Adolescent↗
PubMed1993

Effects of therapeutic doses of salbutamol alone and combined with beclomethasone dipropionate on airway responsiveness and cyclic AMP plasma levels in asthmatic patients.

Twelve asthmatic patients received by inhalation for 2 weeks, in a double-blind, cross-over design, beclomethasone dipropionate (BDP; 600 micrograms/day) plus salbutamol (S; 900 micrograms/day), or S (900 micrograms/day) alone. Before and after each treatment course the subjects received intravenous cumulative doses of S up to 200 micrograms. In basal conditions and immediately before the next dose forced expiratory volume in 1 s (FEV1) and plasma cyclic AMP (cAMP) were measured. BDP+S treatment increased FEV1 basal values (p < 0.05) whereas inhaled S resulted in unsignificant improvement of ventilatory parameters. The slopes of the dose-response curves of FEV1 and plasma cAMP to intravenous S were unaffected by the two treatment courses. Our results suggest that DBP+S, differently from S alone, improves ventilatory function in asthmatic patients and that neither S nor S+BDP seem to affect adrenergic function.

Administration, Inhalation↗
PubMed1993

Evaluation of the bronchodilating activity and the tolerability of broxaterol administered as a solution by inhalation.

The aim of this study was to evaluate the bronchodilating activity and the tolerability of broxaterol (B, CAS 76596-57-1) given as drops by inhalation after single administration at different doses and after repeated administrations for 1 month. Two groups of 12 patients each were treated in a double-blind fashion and according to a within-subject design: one group with B at the single doses of 1.25 mg and 2.50 mg and with placebo (P), and the other with B at the dose of 0.75 mg and with P. A further group of 12 patients was treated in open fashion for 1 month with B at the dose of 1.25 mg 3 times a day. On each study day for the single doses and on the 1st and 30th days for the repeated doses, forced vital capacity (FVC), forced expiratory volume (FEV1), maximal middle expiratory flow (MMEF), heart rate (HR) and systolic and diastolic blood pressure (BP) were measured immediately before and 15, 30, 60, 120 and 240 min after the conclusion of the treatment. At the beginning and at the end of the 1-month treatment period, haematology and biochemistry were checked. After B 0.75 mg, 1.25 mg and 2.50 mg the values of spirometric variables proved significantly and dose-dependently higher than the basal values. The changes from baseline in lung function test values with B (all doses) were significantly greater than with P.(ABSTRACT TRUNCATED AT 250 WORDS)

Administration, Inhalation↗
PubMed1992

Effect of deflazacort on growth hormone response to insulin tolerance test.

Deflazacort (DF) has been claimed to be provided with a reduced distribution into the central nervous system, therefore it is conceivable that this glucocorticoid holds a lower inhibitory effect on GH secretion. To test this hypothesis we studied the GH response to insulin tolerance test (ITT) in two matched groups of patients given equivalent doses of DF and prednisone (PN). The serum glucose changes induced by ITT were similar in the two groups and in control subjects; the mean increase in plasma GH, in particular the peak and the area under the curve (delta AUC), were not different in control subjects and DF-treated patients (25 +/- 12.5 ng/ml and 1790 +/- 904 ng/ml/min versus 27.7 +/- 21.5 ng/ml and 1578 +/- 1242 ng/ml/min) but were significantly reduced in PN-treated patients (8.8 +/- 9.7 ng/ml and 431.6 +/- 451 ng/ml/min). Our study demonstrates that DF does not interfere with the GH response to ITT as PN does.

Adult↗
PubMed1991

The effects of iodoprophylaxis on thyroid size during pregnancy.

Thyroid gland size was ultrasonographically determined in 35 pregnant women who live in an area with moderate iodine deficiency. Iodide salt was administered to group A (n = 17), whereas group B (n = 18) was used as a control. Each group was tested for thyroid-stimulating hormone serum levels, iodine excretion, and thyroid volume. In both groups thyroid-stimulating hormone levels were similar and did not change throughout pregnancy. The iodine excretion at the third trimester in the treated group was significantly (p less than 0.01) higher than that of group B (100.0 +/- 39.0 versus 50.0 +/- 37.0 micrograms iodine per 24 hours, respectively). Initially, thyroid volume did not differ between the two groups. At the end of pregnancy, no difference was found in thyroid size in group A, whereas in the untreated women it increased significantly (p less than 0.0001) with a mean increase of 1.6 +/- 0.6 ml (16.2% +/- 6.0%). These results show that the increased thyroid size in the control group was mainly a result of relative iodine deficiency and that iodoprophylaxis should be warranted even in areas with moderate iodine deficiency to prevent the increase in thyroid size and, probably, to avoid the risk of maternal and fetal hypothyroidism.

Adult↗
PubMed1990

Ontogenesis of the nuclear 3,5,3'-triiodothyronine receptor in the rat testis.

The aim of this study was to investigate the ontogenesis of the nuclear T3 receptor among the different cell types in the rat testis from fetuses at the 19th day of gestation and animals 1, 5, 15, 20, and 60 days after birth. Whole testis, tubular fraction, nontubular fractions, and Sertoli cells cultured in vitro or enriched in vivo by irradiation were used. The results demonstrate that high affinity, low capacity T3-binding sites are localized only in Sertoli cells; the binding specificity and affinity (Kd ranges from 0.8 +/- 0.2 to 2.6 +/- 0.4 nM) do not change significantly with the age of the animals and are comparable to those observed for T3 receptors in other mammalian tissues. In the whole testis, the concentration of receptors changes during gonadal development, being maximally expressed in the fetus (154.3 +/- 8.1 fg T3 bound/10(6) nuclei) and from 1 (203.4 +/- 10.9 fg T3 bound/10(6) nuclei) to 5 (185.3 +/- 15.1 fg T3 bound/10(6) nuclei) days of postnatal life, decreasing significantly at 15 and 20 days (65.4 +/- 2.0 and 57.9 +/- 1.9 fg T3 bound/10(6) nuclei, respectively) and being virtually absent in the adult. The same change in receptor concentration was found in Sertoli cells obtained by different techniques. This ontogenetic profile coincides with the pattern of Sertoli cell proliferation and differentiation, thus suggesting a role of thyroid hormones in the regulation of growth and maturation of the somatic cells of the seminiferous epithelium.

Animals↗
PubMed1989

Differential effects of nifedipine and diltiazem on methacholine-induced bronchospasm in allergic asthma.

The protective effect of nifedipine and diltiazem on methacholine-induced bronchoconstriction was studied in 12 allergic asthmatic patients. Nifedipine significantly but weakly attenuated airway reactivity to methacholine, whereas no protective effect was shown by diltiazem. We conclude that the two calcium antagonists have different effects on human airways. Furthermore, our results suggest that the action of nifedipine on methacholine-induced bronchospasm is too weak to justify its recommendation as therapy.

Adult↗
PubMed1987

[Preoperative evaluation of the patient candidate for surgical intervention on the chest: methods of study and risk factors].

The authors review the main methods designed to evaluate operability and surgical risk in candidates for chest surgery. They also report on their own experience with 135 cases operated on for thoraco-pulmonary diseases requiring surgery; in these cases, postoperative complications were studied in relation to various respiratory parameters evaluated differentially and as a whole prior to surgery. This study enabled the investigators to establish that patients with CV, FEV1, FEF25-75 and Tiffffeneau Index values below 60% of the respective theoretical reference values run a very substantial risk of postoperative complications, with a post-surgical morbidity rate of more than 60% in such patients. Similar risks are run by patients with VR values below 60% or above 120% of predicted values or with Emphysema Index values above 120% of predicted values. The author's experience with fractional bronchospirometry revealed that, in the high-risk patient sample, a predicted postoperative FEV1 value of only 800 ml/sec is a poorly selective limit.

Adolescent↗
PubMed1986

Variations in absorption of theophylline from two sustained-release products.

The intrasubject variability in the absorption of two sustained-release theophylline products was investigated in eight healthy volunteers, aged 27 to 38 years. Each subject randomly received 500 mg of Somophyllin-CRT on two days and 600 mg of Theo-Dur on two other days. At least one week separated each of the study days. Blood samples were collected at frequent intervals after each dose over a 24-hour period. Serum theophylline concentrations were assayed in duplicate by means of an enzyme immunoassay. The serum theophylline concentration-time curves were used to calculate the peak serum concentrations, the time to peak concentration, and the area under the curves for each subject. The intrasubject variability of these values was great with both drugs, but Theo-Dur demonstrated greater variability than did Somophyllin-CRT.

Adult↗
PubMed1985

[Respiratory function after traumatic rupture of the diaphragm].

In eight patients who underwent surgical treatment for diaphragmatic rupture, pulmonary function and differential ventilation of the lungs were evaluated four months-one year after surgery. The results of the study show that diaphragmatic rupture produces only a small reduction in total ventilatory function. Moreover our data indicate that the ventilation estimated to be contributed by the side injured, is decreased in a larger extent in abdominal than in thoracic trauma.

Adolescent↗
PubMed1983

[Multivariate statistical analysis in predicting bronchopulmonary complications after surgical interventions in cancer of the lung].

A multivaried statistic process, the linear discriminant analysis, applied to VEMS, CV, I.T., FEF 25-75, pH, PaO2, PaCO2, was used by the authors to foresee, in 42 patients suffering from bronchogenous carcinoma, the arising or absence of respiratory complications after operation. With such method, the falsely positive or negative previsions, resulted to be 13 with a total percentage of error as high as 30%. These results suggest that, even when elaborated through the multivaried analysis, the parameters studied do not allow to adequately discriminate the patients who would develop, after operation, bronchopulmonary complications from those who would be exent from them.

Adult↗
PubMed1981

[Comparison of the Waaler-Rose reaction and the optimized Singer-Plotz reaction].

The latex reaction according to Singer & Plotz, an optimised version of the same employing heating at 56 degrees C for 24 hr, and the modified Rose-Waaler test were used to determine rheumatoid factor in the serum of 65 subjects, including 33 with rheumatic and joint diseases, 22 with liver diseases, and 10 presumed to be normal. This optimised latex test is put forward as a supplement to high sensitivity of the simple latex test, and the high specificity of the Rose-Waaler test. In the series examined, it gave results whose clinical comparability was at least on a par with that provided by the Rose-Waaler test.

Adult↗