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Biomedical subjects

O Geatti

Publications and source records attributed to O Geatti.

At least 55 records · Page 3Linked to original sources
PubMed1987

Kinetics of interstitially administered monoclonal antibodies for purposes of lymphoscintigraphy.

The clearance rates of radiolabeled murine monoclonal intact IgG, F(ab')2 Fab and of an IgM following subcutaneous administration were evaluated in normal mice and rats using nuclear imaging and counting techniques. These studies suggest no significant difference in clearance rate exists between intact IgG and its F(ab')2 fragment, and little difference between these moieties and intact IgM. Fab is cleared considerably faster than the others, however. While significant differences in clearance rates exist, the magnitude of the differences are not as large as those following intravenous injection particularly when ambulation by the animal is allowed. When ambulation is allowed, clearance rates of all classes and fragments are accelerated and quite similar. Injection into the subcutaneous tissues of the footpad results in consistently faster clearance than an injection into the subcutaneous tissues of the abdomen. Ambulation considerably increased the clearance of antibodies, presumably by increasing lymph flow. These studies imply that the choice of intact antibody versus fragments for kinetic reasons may be less critical (particularly if ambulation is allowed) by the subcutaneous as compared with the intravenous delivery route. This kinetic information should be useful in designing imaging protocols with radiolabeled antibodies administered subcutaneously for purposes of imaging disease processes involving the lymphatics.

Animals↗
PubMed1985

[Changes in the circadian rhythm of urinary cyclic adenosine monophosphate during the alcoholic withdrawal syndrome and related neurobiological correlations].

Urinary cyclic adenosine monophosphate (AMP-c) was measured morning and evening in 35 patients with alcohol withdrawal syndrome (AWS). 65% of the patients revealed a higher night time than day time concentration of AMP-c in the urine, reflecting increased sympathetic adrenergic activity. The circadian rhythm was lost in 88.55% of the 35 patients. The pathogenic factors and mechanisms involved in AWS are discussed and the contribution of sympathetic adrenergic hyperactivity to the onset of the withdrawal syndrome with its concomitant depression of the cholinergic and GABAergic systems is emphasised. Finally it is suggested that insomnia and the loss of REM sleep may also contribute to the onset of the condition.

Adult↗
PubMed1985

[Prolactin in chronic alcoholic liver diseases with and without gynecomastia].

The Authors, after having examined the factors responsible for the hyperprolactinemia in the cirrhotic, confirm the lack of a relationship between the increase in the prolactinic reserve and gynecomastia and between the amount of the prolactinic reserve and the degree of liver disorder. While hyperestrinism and the false transmitters lost most of their pathogenetic importance, other factors such as GABA, the Serotonin and the VIP, offered a new pathogenetic prospective. The prolactin reserve was studied in 63 patients affected by cirrhosis and in 25 affected by fibrosis and hepatic fibrosteatosis, pointing out an increase in the prolactin reserve in 61% of cirrhotic patients and an absence of pathological reports in patients affected by fibrotic hepatopathies. These data confirm the low pathogenetic responsability to be strictly ascribed to ethanol and the preminent role of liver cirrhosis and portal hypertension in the prolactin turnover.

Fatty Liver, Alcoholic↗
PubMed1985

Iodine-131 metaiodobenzylguanidine scintigraphy for the location of neuroblastoma: preliminary experience in ten cases.

Ten patients with histologically proven neuroblastoma were studied by [131I]MIBG scintigraphy. Tumor uptake of the radiopharmaceutical showed a spectrum varying from no uptake in one case, to slight uptake in two, moderate uptake in two and intense uptake in five cases. Iodine-131 MIBG scintigraphy was more effective in demonstrating the extent of neuroblastoma spread than were conventional bone scan and CT in one patient, equal to these modalities in four cases, almost equal in two cases and significantly inferior in three cases. These preliminary results suggest that [131I]MIBG scintigraphy is useful in detecting the presence and delineating the distribution of neuroblastoma and may, in certain cases, have therapeutic potential.

3-Iodobenzylguanidine↗
PubMed1984

[Prolactin in the alcohol withdrawal syndrome. Role of the dopaminergic system].

The basal prolactinemia and the prolactinic reserve were investigated in 30 chronic alcoholics, during the alcohol withdrawal syndrome. In 80% of these patients, the prolactinic reserve was extremely low, while in 16,66% of them was normal or near the lowest limits, recognizing in the exaggerated dopaminergic central activity the responsible pathogenetic mechanism. The dopaminergic hyperactivity fits into a general context of the sympathetic-adrenergic hypertonia, which notoriously plays a primary pathogenetic role in the pathogenesis of the alcohol withdrawal syndrome. In 5 patients with an inhibited prolactin response, a normalization of the prolactin reserve was registered in a test (the same methoclopramide test) carried out after 2-3 months of abstinence from alcoholic beverages, as an evidence of the normalization of the central dopaminergic activity and of a dopaminergic hyperactivity during the alcohol withdrawal syndrome.

Adult↗
PubMed1984

[Insulin, peptide C and glucide tolerance in chronic alcoholic hepatopathies].

Changes in blood glucose and insulin metabolism, both under basal conditions and after glucose and glucagon stimulus, were studied in 95 patients with chronic alcoholic hepatopathy. Peptide C was also determined in 19 patients. A high incidence of islet-cell insufficiency was noted. Stress is laid on the multiplicity of the pathogenetic mechanisms responsible for blood glucose and insulin changes during chronic alcoholic hepatopathy, particularly liver cell damage, hyperglucagonaemia, organic and/or functional islet-cell insufficiency, and peripheral insulin resistance. It is felt that the last two of these are of major importance, whereas liver cell damage is of secondary significance, at any rate as far as glucose and insulin turnover is concerned.

C-Peptide↗
PubMed1984

[Cyclic adenosine monophosphate (3'5' cAMP) in the alcohol withdrawal syndrome. Clinico-pathogenetic perspectives].

The cyclic adenosine monophosphate (AMP-c) excreted in the urine over a 24 hour period was systematically measured in 40 patients suffering from alcohol withdrawal syndrome (AWS) in varying degrees from slight to delirium tremens. In almost all patients the level of excreted AMP-c was high bul returned to normal when the clinical picture together with arterial pressure and cardiac frequency, was normalised. This shows the primary importance of the central sympathetic-adrenergic system in the pathogenesis of AWS and the value of monitoring urinary AMP-c excretion during the syndrome.

Adult↗
PubMed1983

[Bone scintigraphy in mastectomized patients with and without chemotherapy].

Follow'ups were conducted on 130 mastectomized patients, periodically subjected to bone scintigraphy in addition to conventional tests. 89 of the patients had received chemotherapy and 41 had not. The results obtained show the value of scintigraphy for both accurate staging and follow-up in such patients.

Adult↗
PubMed1981

Increased prolactin reserve in alcoholics.

The prolactin response to oral metoclopramide (10 mg) was investigated in 53 chronic alcoholics (26 with alcoholic cirrhosis and 27 without evidence of liver disease) from two to seven days after alcohol suspension. The response appeared significantly higher in patients than in healthy controls and was not related to the presence of liver disease. This finding may depend on the deactivation of the dopaminergic activities secondary to alcohol suspension; alternatively, ethanol could have a direct action on prolactin secretion.

Adult↗
PubMed1980

[Excessive prolactinemic response to sulpiride in patients with mild essential hypertension. Index of diminished hypothalamic dopaminergic activity].

Plasma prolactin concentrations and prolactinaemic response to sulpiride, a prolactin releaser with pituitary dopamine receptor blocking activity, were examined in 16 subjects with mild essential hypertension and in 20 patients with long-sustained essential hypertension. When compared with 16 normotensive controls only the former showed raised plasma renin activity (P < 0.001) and higher plasma prolactin levels either after two-hour ambulation (P < 0.05) or at supine rest (P < 0.05). The average of maximal sulpiride-induced prolactin values was 157 +/- 53 ng/ml (mean +/- SD) in the mild hypertensive, significantly different from 60.2 +/- 21.4 ng/ml (mean +/- SD) as resulted in the controls (P < 0.001). In contrast, patients with sustained hypertension had a mean level of 60.2 +/- 21.4 ng/ml (mean +/- SD), indifferent from the one of the normal volunteers. It is suggested that the excessive prolactinaemic response to sulpiride detected in patients with mild hypertension reflects a reduced hypothalamic dopaminergic activity and that such an alteration may assume some pathogenetic relevance in the natural history of essential hypertension. Further, in the mild hypertensive a positive prolactin-renin correlation was found (r = + 0.76; P < 0.01), so suggesting that in these patients a peripheral sympathetic overactivity is associated to an impaired central dopamine control. The individuation of such cases may be important since they could benefit by dopamine agonists as L-dopa and bromocriptine.

Adult↗
PubMedDate not supplied

[An occult pancreatic insulinoma: radio-guided surgery with 111-In-octreotide. A case report and review of the literature on pre- and intraoperative diagnosis].

INTRODUCTION: Pancreatic insulinoma is a small, rare neoplasm; its radical therapy is surgical enucleation or resection. Although clinical diagnosis is simple, instrumental and radiological localization is still difficult (occult insulinoma: 10-20%). MATERIAL AND METHODS: The authors present the case of a 71-year-old patient suffering from relapsing vertigo syndrome, derangement and transient lypothymia after strong physical activity. ECG, encephalic and abdominal C.T., eco-color-Doppler of epiaortic vessels failed to identify any pathological features. Laboratory tests only revealed that basal glycemia was always lower than normal. Insulinoma was strongly suspected following the outcome of dosages of insulin and C-peptide in the serum and was confirmed after a supervised fast test (72 h). Once the biochemical diagnosis had been reached an abdominal eco, C.T., a selective and superselective angiography and echo-endoscopy were carried out to locate the tumor site but results were negative. Only somatostatin-receptor scintigraphy with 111 In-octreotide detected a catchment area (diameter: 3 cm) to the right of the hypochondrium, anterior to the kidney and caudal to the left hepatic lobe. RESULTS: During laparotomy a hand-held gamma detecting probe (C-Trak) was used to detect in situ tumour binding of the radiolabelled octreotide and a neoplasm was identified and enucleated from the pancreatic head (diameter: 7 mm), undistinguishable from the surrounding parenchyma. Postoperative signal checks of the surgical field and of the neoplasm revealed, in the first, the absence of captation and, in the second, maximal captation. Histological findings confirmed the nature of the neoplasm: an insulinoma with a ring pattern. Two years after surgery the patient is in good health, with no signs of relapse. CONCLUSIONS: Radio-guided surgery with labelled octreotide makes it possible to pinpoint small insulinomas, locate occult neoplasm, verify the completeness of surgical excision in the field and in the surgical piece, by comparing the different captation of labelled octreotide and check neoplasm multicentricity and any metastases.

Aged↗
PubMedDate not supplied

Sestamibi scintimammography in pT1 breast cancer: alternative or complementary to X-ray mammography?

The aim of this study was to compare the results obtained using X-ray mammography (MG) and 99mTc-sestamibi scintimammography (SSM) in patients with breast lesions < or = 2 cm. One hundred and thirty-four women (median age 52 years, range 32-78), who had already been selected for open breast biopsy, underwent both MG and SSM prior to surgery. Final pathology showed 27 (20.1%) benign breast lesions and 107 (79.9%) breast cancers (pT1a=5 [4.7%], pT1b=50 [46.7%], pT1c=52 [48.6%]). The sensitivity, positive predictive value, negative predictive value and accuracy were 81.3%, 97.6%, 55.6% and 83.6% for SSM and 83.2%, 89.9%, 48.6% and 79.1% for MG, respectively. The results were similar (p=NS), but patients with breast cancer (BC) undetected by MG were significantly (p<0.05) younger than those in which the tumor was correctly diagnosed, while the age did not affect SSM sensitivity. SSM was more (p<0.05) specific than MG in BC detection both in the overall group of patients (92.6% vs 63.0%) and in those with < or = 10 mm breast lesions (94.7% vs 63.2%). In conclusion, in patients with suspected BC sized < or = 2 cm, SSM may help in surgical planning because of its high specificity, and should be considered complementary to MG, especially in younger women.

Adult↗