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Biomedical subjects

M Colombi

Publications and source records attributed to M Colombi.

At least 91 records · Page 5Linked to original sources
PubMed1982

Low-dose heparin in thoracic surgery: effect on blood coagulation and fibrinolysis system.

Plasma kallikrein, antithrombin III and antiplasmin were determined with chromogenic methods in 29 patients pre-, per- and post-operatively in a controlled, randomized study. 16 patients received calcium heparin, 5000 IU s. c. every 8 hr for 7 days, the first administration given 2 hr before surgical procedure. 13 control patients received saline. A significant reduction of kallikrein and antiplasmin in per- and post-operative periods was observed in the control patients compared with the heparin-treated patients, while there was a significant reduction of anti-thrombin III in the control patients compared with the treated patients only in the per-operative period. The results obtained suggest that activation of the coagulation and fibrinolysis system occurs in patients undergoing thoracic surgery, and that it is inhibited significantly by calcium heparin prophylaxis.

Adult↗
PubMed1982

Expression of transformation markers and suppression of tumorigenicity in human cell hybrids.

Somatic human cell hybrids produced by fusion of HeLa cells and diploid fibroblasts were analysed in a study designed to test the coordinate expression of transformation markers and tumorigenicity. The great majority of these hybrids displayed a finite lifespan in culture, but some of them inherited from the HeLa parent the capability to grow as permanent cell lines. Hybrids from both groups all had a plasminogen activator activity 20 to 100-fold higher and a cloning efficiency in semisolid medium 2 to 10-fold lower than the HeLa parent. Cell surface fibronectin was expressed at variable levels, albeit in a disorganized form. No correlation between the level of plasminogen activator or fibronectin content and cloning efficiency in agar was observed. Two hybrid lines, assayed for tumorigenicity in nude mice, did not produce tumors, even at inocula 20-fold greater than those at which the HeLa cells formed tumors.

Animals↗
PubMed1982

Abnormal platelet function in a case of megakaryoblastic leukaemia.

A platelet function study in a patient with megakaryoblastic leukaemia is reported. The abnormalities of the platelet function suggest a probable platelet membrane injury and a platelet release defect. The reduced platelet half-life and the non changing splenohepatic ratio confirm the clinical and histological features of the systemic disease.

Bleeding Time↗
PubMed1982

Beta-thromboglobulin and platelet factor 4 plasma levels during haemodialysis: effect of indobufen.

The effect of a single dose of indobufen (100 mg i.v.) on the release of beta-thromboglobulin and of the platelet factor 4 was investigated during dialysis in 20 uraemic subjects by a within-subjects, single-blind, indobufen versus placebo study. Plasma levels were measured in baseline conditions and 15, 30, 60, 120 and 240 minutes after the beginning of dialysis. Pre-treatment with indobufen clearly inhibited beta-TG and PF 4 output. The difference from placebo was highly significant (p less than 0.01) from the 30-minute control up to the end of dialysis. No changes in platelet count before and after dialysis were observed.

Adult↗
PubMed1982

Thrombolytic therapy for venous thrombosis in patients with gastro-intestinal diseases.

Venous thrombosis in 2 patients with gastro-intestinal diseases (chronic liver disease and ulcerative colitis) is reported. A good clinical improvement was obtained after thrombolytic (urokinase) therapy without any haemorrhagic side-effect. A decrease in the plasma of the fast-acting antiplasmin has been correlated with urokinase thrombolytic effect in vivo. These preliminary reports suggest that thrombolytic drugs are a safe tool for the treatment also of thromboembolic complications in patients with potential haemorrhagic diathesis.

Aged↗
PubMed1982

Inhibition of human platelet function by parsalmide.

2-Propargyloxy-5-amino-N-butyl-benzamide (parsalmide), an antiinflammatory drug, inhibits human platelet function in vitro and ex vivo. The degree of inhibition of ADP- and collagen-induced platelet aggregation "in vitro" is dose-dependent and parsalmide shows a more marked effect than equal concentrations of acetylsalicylic acid (ASA) and indometacin. Moreover, malondialdehyde levels in human PRP after addition of thrombin were inhibited at the same degree by parsalmide, ASA and indometacin. In ex vivo experiments, the administration of 400 mg p.o. of parsalmide in arthropathic patients shows a significant inhibitory effect on ADP-induced platelet aggregation at 3 and 24 h after treatment, while a drop of malondialdehyde levels was observed only at 3 h after treatment. No significant inhibitory effect was observed in collagen-induced platelet aggregation.

Adenosine Diphosphate↗
PubMed1976

Subaortic stenosis caused by two discrete membranes.

A case of subaortic stenosis caused by two discrete membranes is presented. Following demonstration of the two distinct sites of obstruction by intraventricular pressure gradients and angiocardiogram, the two membranes were excised through a transaortic approach. The importance of being aware of the occurrence of this rare anomaly is stressed, and its surgical implications are discussed.

Angiocardiography↗
PubMedDate not supplied

Diagnosis and treatment of fungal infections in patients with hematologic malignancies.

A diagnosis of deep-seated mycosis was made in 54 patients with hematologic malignancies, severe neutropenia and fever, based on a set of clinical and laboratory criteria. Standardized antifungal treatment was started in 31 patients who seven days after onset of fever had not responded to antibiotics; the fungal infection was cured in 13, all of whom had a simultaneous remission of neutropenia, whereas the other 18 who did not respond to antifungal treatment, all had a falling or static neutrophil count. None of the 23 patients who were given no or inadequate antifungal treatment survived regardless of the neutrophil count and/or phase of the hematologic disease. We discuss the suitability of utilizing empirical criteria for a diagnosis of disseminated fungal infection as a basis for starting antifungal therapy in this type of patient.

Adolescent↗
PubMedDate not supplied

Scanning electron microscopy of podocytes of the renal glomerulus of rats with nephrotoxic serum nephritis.

Nephrotoxic serum nephritis was produced in rats by intraperitoneal injections of rabbit nephrotoxic serum. Heterologous and autologous phases of nephritis were demonstrated by immunofluorescence and ultrastructural studies. Scanning electron microscopy showed changes in the surface of the podocytes, swelling of the arm-like cytoplasmic processes, and disappearance of the pedicles. The podocyte alterations are discussed.

Animals↗
PubMedDate not supplied

Thrombosis prevention with ticlopidine after femoropopliteal thromboendarterectomy.

Fifty patients submitted to thromboendarterectomy in the femoropopliteal district for obstructive arterial disease of the lower limbs, documented angiographically, were randomly allocated to treatment with ticlopidine (500 mg/day) (T) or a placebo (P) in double-blind conditions. The treatment was started as soon as possible after the surgical intervention and was continued for six months or until a clinically evident reocclusion occurred. There were 46 patients available for assessment, 23 in each treatment group both of which were comparable in preoperative characteristics and type of surgery. Doppler ultrasonography at the end of treatment showed three cases of reocclusion of the operated segment in the T group versus six occlusions and seven significant stenoses in the P group (p = 0.003). Clinically, the active treatment significantly reduced the incidence of both acute ischemia during the treatment (four cases, all in the P group) and residual claudication at the end of treatment: in the T group five patients presented persistent or recurrent symptoms versus 16 in the P group (p = 0.001). Hemostatic function tests showed a marked inhibition of platelet activation in the T group. The treatment was well tolerated.

Aged↗