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Biomedical subjects

L Mansi

Publications and source records attributed to L Mansi.

At least 55 records · Page 3Linked to original sources
PubMed1995

111In-octreotide in the evaluation of autoimmune thyroid diseases.

Aim of our study was to evaluate the uptake of Indium-111 Octreotide (OCT) at the level of thyroid and orbits in autoimmune thyroid diseases. Nine patients with Graves' disease (GD) who were also affected with thyroid associated ophthalmopathy (TAO) and four patients with Hashimoto's thyroiditis (HT) were evaluated. A patient with lung cancer, presenting ophthalmopathy did not related to autoimmune dysthyroidism, was also studied. All patients with ophthalmopathy were evaluated by a Clinical Activity Score and an A-scan standardized echography. Multiple planar images were acquired over a 24-hour period after i.v. injection of 111 MBq of 111In-OCT. A SPECT study was also obtained in 7 patients five hours after the injection. A qualitative analysis was performed. Semiquantitative ratios comparing the counts on the thyroid with respect to background (T/BK) and on the orbits and brain with respect to the blood-pool were also obtained. Thyroid uptake of OCT was higher in GD with respect to HT, and was not related to the functional state of the gland. The highest T/BK ratio was observed at the 24 hour control. Intense orbital uptake was observed only in case where a clinically active ophthalmopathy was present.

Adult↗
PubMed1993

Conservative treatment in splenic trauma.

Conservative management of splenic injuries following blunt abdominal trauma is receiving increasing support following delineation of the role of the spleen in preventing infections. This report describes experience with the treatment of 215 consecutive cases treated between 1982 and 1989. A total of 38 patients underwent non-operative management (NOM), 16 splenorrhaphy, 16 partial splenectomy, 60 splenectomy with autotransplantation and 85 splenectomy alone. All patients, regardless of the treatment received, were assessed before discharge and periodically with a maximum follow-up of 5 years. During the follow-up period immunohaematological studies were performed that demonstrated an almost normal activity in the autotransplantation group when compared with the simple splenectomy group. No major complications were observed in the autotransplantation group; a good function and morphology of the re-implanted splenic tissue was always evident by radioisotopic, echographic and histological studies. A conservative approach should always be considered in splenic trauma. In cases where NOM, splenorrhaphy and partial resection are unsafe, splenectomy with autotransplantation should be considered as this simple and reliable technique allows preservation of splenic function.

Adolescent↗
PubMed1991

Malignant melanoma of the nipple: a case studied with radiolabeled monoclonal antibody.

We describe a case of histologically confirmed malignant melanoma of the nipple. The rare occurrence of these lesions accounts for the relative lack of criteria for standard surgical treatment. After a conventional workup including mammography, chest X ray, bone scan, liver ultrasonography and cytologic smear of the lesion, we used specific radiolabeled monoclonal antibody and external photoscanning to differentiate melanoma from Paget's disease. The patient underwent wide local excision of the lesion and axillary node dissection, and tumor control is optimal since she has no evidence of disease after 5 years of follow-up.

Antibodies, Monoclonal↗
PubMed1991

Endobronchial administration of iodine-131 B72.3 monoclonal antibody in patients with lung cancer.

We tested the feasibility of endobronchial administration of radiolabelled monoclonal antibodies (MoAbs) and the biodistribution of the radiotracer. Ten patients with histological confirmed adenocarcinoma or squamous cell carcinoma were studied. Nine received 470 muCi (103 micrograms) of Iodine-131-B72.3, a monoclonal antibody reacting against TAG 72 antigen, while one patient received 502 muCi (291 micrograms) of 131I-4C4, an indifferent antibody used for comparison in a negative control study. The radiolabelled antibody was administered through a flexible fiberoptic bronchoscope and placed on the tumour mass under visual monitoring. Scans with a large field-of-view gamma-camera showed retention of 131I-B72.3 at the tumour site up to 6-9 days in six of eight patients. No other organs were visualized with the exception of faint activity in the gastrointestinal tract, bladder and thyroid. On the contrary, the indifferent antibody 131I-4C4 was not retained at the tumour site 6 days after MoAb administration, and more prominent activity was found in the gastrointestinal tract. In one patient the study was not technically adequate because of failure of the delivery system. The vascular compartment contained less than 3% of the administered dose. We conclude that endobronchial administration is a feasible technique and allows stable and specific targetting of bronchial tumours. Furthermore, the low activity found in the plasma and other organs suggests that this approach may be used to deliver therapeutic doses of MoAbs to lung cancers.

Adenocarcinoma↗
PubMed1991

Effect of acute administration of L-acetyl carnitine on cerebral blood flow in patients with chronic cerebral infarct.

The effect of L-acetyl carnitine (L-AC) on cerebral blood flow (CBF) was evaluated in 20 patients with chronic cerebrovascular disease, who suffered an ischaemic stroke at least 6 months before the study. All patients performed a CT scan and were investigated with xenon-133 by brain dedicated single photon emission computed tomography (SPECT, Tomomatic 32, Medimatic Inc., Copenhagen). A single high dose (1.5 g) of L-acetyl carnitine was intravenously administered to 10 patients, while sodium acetate as placebo was injected to 10 other subjects. Cerebral blood flow (ml/min x 100 g) was evaluated before and 45 min after the injection. No changes were observed after placebo injection (43 +/- 12 ml/min x 100 g versus 43 +/- 10 ml/min x 100 g). CBF increased (from 42 +/- 9 ml/min x 100 g to 46 +/- 9, P less than 0.05) in both ipsilateral and contralateral hemisphere, the ischaemic area, but not in the stroke corresponding zone. It was concluded that L-acetyl carnitine at the i.v. dosage of 1.5 g acutely enhanced CBF in patients with chronic cerebral infarct.

Acetylcarnitine↗
PubMed1991

Mixed transcortical aphasia: clinical features and neuroanatomical correlates. A possible role of the right hemisphere.

This paper reports the clinical features of 2 patients affected by mixed transcortical aphasia. Both of them had extensive damage of the left hemisphere. Cerebral blood flow measurement showed a marked decrease in left-hemisphere flow. In particular, speech areas were found to be morphologically and functionally damaged. The present findings, together with a critical review of the literature, served as a starting point for a discussion of linguistic features, diagnostic criteria and classical neuroanatomical interpretation of mixed transcortical aphasia. The possible contribution of the right hemisphere in determining this aphasic syndrome is suggested.

Aged↗
PubMed1990

Amphotericin B-induced depression in the phagocytic function of the isolated rat liver and its prevention by nifedipine.

We investigated the effects of the antimycotic agent amphotericin B (AmB) on the phagocytic activity of the isolated perfused rat liver. At a concentration of 5 microM, the drug markedly reduced the clearance of latex beads by the liver as compared to control preparations. Scanning electron microscopy observations showed that latex beads were attached only to Kupffer cells. A liver scan performed infusing 99Tc-colloidal albumin showed that AmB depressed the uptake of the colloid in all hepatic lobes, with no focal defects. Both in control and AmB experiments no trypan blue uptake occurred. The pretreatment of the perfused liver with the calcium antagonist nifedipine prevented the decrease in phagocytosis induced by AmB. In addition, AmB had no effect on livers perfused with a Ca2(+)-free medium. A decrease in the phagocytic capacity of the perfused liver was also observed after the administration of the Ca2(+)-ionophore A23187. The observations suggest that AmB may exert an intrinsic toxicity on the Kupffer cells, which is, at least in part, responsible for the decrease in phagocytosis induced by the drug. This effect may be of relevance to clinical situations and deserves careful consideration.

Amphotericin B↗
PubMed1990

The biological approach to radioimmunoscintigraphy.

The authors have analysed the theoretical and clinical implications of a biological approach to radioimmunoscintigraphy (RIS), a new diagnostic technique based on the in vivo reaction between radiolabelled monoclonal antibodies and tumor-associated antigens expressed by the neoplastic cells. The assumption is that, as in all radioisotopic procedures, the radioimmunoscintigraphic image is the expression of differences in concentration (and not in density) between adjacent tissues. This "biological premise" is analysed to demonstrate a possible role of RIS not only in diagnosis but also in prognosis and therapy. A comparison with other imaging procedures and with histopathology, considered as the "gold standard" of the present-day morphological approach to diagnosis, is also discussed. Finally, biological premises, as well as the initial results and prospects regarding the use of high doses of radiolabelled monoclonal antibodies for therapeutic purposes are presented.

Antibodies, Monoclonal↗
PubMed1989

Diagnosis of ovarian cancer with radiolabelled monoclonal antibodies: our experience using 131I-B72.3.

Radioimmunoscintigraphy (RIS) using 131I-labelled B72.3, a monoclonal antibody (MoAb) reacting against a tumor associated antigen (TAA) called TAG-72, has been performed in 36 patients with epithelial ovarian cancer. The patients were divided in three groups as follows: 17 patients with primary cancer before any therapy (Group 1); 10 patients studied after a partial therapeutic approach, having either bulky or minimal disease (Group 2); 9 patients with microscopic disease or in clinical remission at the moment of the study (Group 3). All the most important epithelial histotypes, including mucinous, were present. Results were confirmed at surgery and/or by other diagnostic procedures. Immunocytochemical (ICC) and immunocytofluorimetric (ICF) studies on ascitic collections were performed in order to demonstrate specificity of B72.3 and TAG-72 distribution on neoplastic cells. Immunohistochemistry (IHC) on tissue sections was also obtained. No cross reactions between B72.3 and mesothelial cells in the presence of specific uptake by neoplastic cells was found. Moreover, a non-homogeneous distribution of TAG-72 in the neoplastic population was demonstrated by ICF. RIS proved the intraperitoneal presence of disease in 15 out of 17 and in 5 out of 10 patients in Groups 1 and 2, respectively. One out of four (Group 1) and two out of four (Group 2) extraperitoneal metastases were also seen. False negative results were explained by lack of expression of the antigen, size and location of the lesion, and patho-physiological conditions. One false positive due to an aspecific uptake by a post-surgical active scar was also observed in a disease-free patient.

Antibodies, Monoclonal↗
PubMed1988

A prospective imaging study of 131I-B72.3 monoclonal antibody in patients with epithelial ovarian cancer: preliminary report.

Twenty patients with known ovarian cancer have been investigated in this pilot study to verify the clinical usefulness of radioimaging using the B72.3 monoclonal antibody labelled with iodine-131. No adverse reactions occurred after intravenous injection of B72.3 MoAb. The radioimaging results were compared with those obtained with other diagnostic methods, including computed X-ray tomography and ultrasound. A sensitivity of 85% in the detection of primary ovarian cancers and collections of ascites, and of 84% in the detection of abdominal and extraperitoneal metastases has been demonstrated using this radioiodinated antibody in vivo. No false localization occurred. Immunohistochemical studies showed no cross-reactions between B72.3 MoAb and mesothelial cells, confirming the high specificity of binding between B72.3 MoAb and neoplastic cells in ascites. Negligible uptake of radiolabelled B72.3 MoAb has been demonstrated in the unaffected ovary. The major advantage of using this monoclonal antibody is related to the expression of a recognized antigen (called TAG 72) in mucinous, serous and in differentiated adenocarcinomas of the ovary.

Abdominal Neoplasms↗
PubMed1988

Quantitative assessment of blood-brain barrier permeability in multiple sclerosis using 68-Ga-EDTA and positron emission tomography.

Fifteen patients with definite multiple sclerosis were examined with high volume delayed (HVD) CT scan and positron emission tomography (PET) using 68-Ga-EDTA as a tracer. The passage of 68-Ga-EDTA across the blood-brain barrier (BBB) was measured by using multiple graphical analysis. This method permits the simultaneous calculation of a blood to brain influx constant Ki (ml/g-1 min-1) and of the plasma volume Vp (ml/g-1). Focal areas of abnormal CT enhancement and pathological accumulation of 68-Ga-EDTA were visualised in four patients who were all examined during a clinical exacerbation of the disease. The mean Ki value measured in these areas was 12.5, SD 3.4 indicating a moderate but significant increase of BBB permeability compared with the value found in normal tissue (3.2, SD 0.9). No parallel increase in Vp values was found in these pathological areas. Quantitative data obtained with PET seems to provide further insight into the study of BBB function in multiple sclerosis.

Adolescent↗
PubMed1987

Cerebral blood flow in thalamic aphasia.

A 59-year-old man is reported, who became aphasic after left thalamic infarction, shown by CT. His speech was fluent, with reduced voice volume, impaired auditory and reading comprehension, verbal paraphasias but intact repetition skills. A single photon emission computed tomography (SPECT) scan to measure regional cerebral flow (rCBF) showed a reduction of flow in the parietotemporal areas of the left hemisphere. It is suggested that thalamic aphasia could result from structural subcortical damage with a homolateral functional cortical deficit leading to the specific aphasic disturbance.

Aphasia↗
PubMed1986

Multicenter study of immunoscintigraphy with radiolabeled monoclonal antibodies in patients with melanoma.

A multicenter study was performed to analyze the efficacy of 99mTc- and 111In-labeled F(ab')2 fragments of monoclonal antibody (MoAb) 225.28S (reactive with a high molecular weight melanoma associated antigen) to radioimage malignant lesions in patients with melanoma. A total of 254 melanoma patients, carrying 412 documented melanoma lesions, were studied in 10 nuclear medicine departments. A total of 377 lesions were visualized in 206 patients; in particular (a) 250 of 412 known lesions were visualized in 159 of 191 patients known to carry melanoma lesions; (b) 95 occult lesions were visualized in 61 patients of the same group; and (c) 32 lesions were visualized in 15 of 63 patients without diagnosed lesions. The melanomic nature of 101 of 127 radioimaged occult lesions was confirmed by clinical criteria and/or by additional laboratory investigations. These results indicate that immunoscintigraphy with radiolabeled F(ab')2 fragments of MoAb 225.28S can provide clinically useful information. Analysis of the variables influencing the outcome of immunoscintigraphy with 99mTc- and 111In-labeled F(ab')2 fragments of MoAb 225.28S confirmed the role of size, anatomic site, and level of high molecular weight melanoma associated antigen in melanoma lesions. Such analysis also showed, for the first time, the influence (a) of the isotope used to radiolabel the antibody fragments and (b) of the clinical stage of the patients. The present study has shown good agreement in the results obtained by the 10 nuclear medicine departments, suggesting that immunoscintigraphy with radiolabeled F(ab')2 fragments of MoAb 225.28S is a reliable procedure.

Antibodies, Monoclonal↗