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Biomedical subjects

P Bellini

Publications and source records attributed to P Bellini.

At least 19 recordsLinked to original sources

Structural studies of the Fur protein from Rhizobium leguminosarum.

The X-ray crystal structure of the apo-form of the Fur protein from Rhizobium leguminosarum has been solved at 2.7 A resolution. Small-angle X-ray scattering was used to give information on the solution conformation of the protein. The Fur homodimer folds into two domains. The N-terminal domain is formed from the packing of two helix-turn-helix motifs while the C-terminal domain appears primarily to stabilize the dimeric state of the protein.

Amino Acid Sequence↗

Can a cyclo-oxygenase type-2 selective tocolytic agent avoid the fetal side effects of indomethacin?

We evaluated the efficacy and safety of nimesulide (100 mg orally twice daily for > 48 hours) in a pilot series of five women (two with twin pregnancies) at 24(+6) weeks (range 21(+3) - 27(+2)) in preterm labour which was unresponsive to intravenous ritodrine. Nimesulide therapy was continued for eight days (5-16) and was associated with a prolongation of pregnancy of 27 days (6-69). Oligohydramnios occurred in all seven fetuses after three to nine days of therapy, and in the five pregnancies that continued after discontinuation of nimesulide, it resolved within four days (2-7). None of the babies manifested permanent renal damage.

Administration, Oral↗

[Metallic elements in tissues surrounding internal rigid fixation (IRF) devices].

BACKGROUND: Plates and other devices made by several alloys have been introduced to reach the stability of bone fractured fragments. Elements constituting alloys could be detected especially in organs, yet also in local tissues. Aim of the present study is the analysis of tissues surrounding IRF devices analyzing the morphology of released particles and studying the behavior of adjacent tissues to check metallic elements diffusion. METHODS: Biopsies were retrieved from 18 patients, aged 20 to 76 years. The patients received IRF by plates, screws and grids from 4 months to 9 years. They were divided into five groups according to the local phlogistic degree. Ordinary light microscopy, scanning electron microscopy and X-ray microprobe analysis (EDS system) was used to perform morphological investigations and identification of metal particles and elements. RESULTS: Metal particles or elements arising from plates, screws or grid may undergo tissular diffusion and cellular uptake. Not only Chromium, Iron or Aluminium but also Titanium may be easily released from devices and engulfed in tissues. In particular Titanium diffusion is evident in fibrous tissue surrounding IRF devices. Aluminium appears to be particularly accumulated in a persistent way in fibrous tissues and shows a characteristic embedding pattern in lamellar bone. CONCLUSIONS: The degree of local phlogosis appears to be strictly correlated to metallosis. Chromium, Iron, Aluminium and also Titanium, even if at different degree, give rise to phlogistic effects. Metallosis and phlogosis can produce a cascade process in which they are both the cause and the effect at the same time. The abundant release of Titanium, which does not normally produce clinical phlogosis as i.e. Aluminium, should be worthy of further investigations on its cellular effects.

Adult↗

Laparoscopic cholecystectomy and the Peter Pan syndrome.

We report the case of a patient who experienced hemobilia a few weeks after undergoing laparoscopic cholecystectomy (LC). This condition was due to the rupture of a pseudo-aneurysm of the right hepatic artery in the common bile duct, probably caused by a clip erroneously fired during LC on the lateral right wall of the vessel. It also caused the formation of multiple liver abscesses and the onset of sepsis. This life-threatening complication led to melena, fever, epigastric pain, pancreatitis, liver dysfunction, and severe anemia, requiring urgent hospitalization and operation. In the operating theater, the fistula was closed, the liver abscesses drained, and a Kehr tube inserted. Thereafter, the patient's general condition improved, and she is now well. LC is often considered to be the gold standard for the management of symptomatic cholelithiasis. However, recent data have undermined that opinion. The apparent advantages offered by LC in the short term (less pain, speedier recovery, shorter hospital stay, and lower costs) have been overwhelmed by the complications that occur during long-term follow-up. When the late downward trend in the bile duct and the vascular injury rate are taken into consideration, the learning curve is prolonged. Therefore, LC should be regarded as the surgical equivalent of a modern Peter Pan-i.e., it is like a young adult who should make definitive steps toward becoming an adult but does not succeed in doing so. We report the case of a patient who experienced hemobilia a few weeks after undergoing laparoscopic cholecystectomy. Based on the facts in this case, we argue that the endoscopic procedure still needs to be perfected and cannot yet be considered the gold standard for selected cases of gallstone disease.

Biliary Fistula↗

[Risk factors and neonatal outcomes in shoulder dystocia].

BACKGROUND: Shoulder dystocia (SD) is a rare obstetrical complication but linked with a high perinatal morbidity and mortality rate. SD has been associated to a series of maternal and fetal risk factors due to a multifactorial etiology. This study analyzes the incidence of SD, its morbidity and associated risk factors. METHODS: Cases of SD occurred at the St. Gerardo Hospital (Monza) between January 1992 trough December 1997 have been retrospectively reviewed. Obstetrical and feto-neonatal data regarding cases of SD were compared to data regarding all the cephalic vaginal deliveries occurred in the same period in our Center. RESULTS: A total of 14,157 cephalic vaginal deliveries were included in this study, of these 21 infants (0.15%) had SD. A significantly higher incidence of SD cases was found in fetal macrosomia, maternal diabetes, induction of labor by PGE2, use of obstetrical vacuum, length of first stage of labor > 4 hours in multiparas and > 8 hours in nulliparas, and length of second stage > 60 minutes, regardless of parity. A closed association was also observed between SD and birth trauma as brachial plexus injury and humerus fracture. CONCLUSION: The incidence of SD in our population (0.15%) is below the average reported in the literature (0.37-1.1%). The well-known risk factors, whose low positive predictive value can nevertheless modify obstetrical management, are confirmed.

Algorithms↗

Amnioreduction in emergency cerclage with prolapsed membranes: comparison of two methods for reducing the membranes.

To evaluate the effectiveness of amnioreduction in pregnancies requiring emergency cerclage placement, we performed a retrospective case-control study of all consecutive pregnant women with cervical dilation and effacement with prolapse of the fetal membranes in vagina between 16 and 26 weeks' gestation, who required placement of a McDonald emergency cerclage during the period January 1991-December 1997. Duration of pregnancy prolongation, rate of delivery before 32 weeks, and duration of neonatal hospital stay were compared between women in whom amniochorionic membranes were reduced at the time of cerclage placement using only intracervical Foley balloon catheter (controls; n = 7) and those who in addition underwent amnioreduction to facilitate cerclage placement (n = 9). Statistical analysis utilized Fisher's exact test and Wilcoxon rank sum test. A p value <0.05 was considered significant. There were no procedure-related ruptures of membranes. Gestational age at cerclage and rate of positive cervico-vaginal cultures were not different between the two groups. Gestation was prolonged for a median of 100 days (range 4 to 144 days) in the amnioreduction group and 10 days (2 to 133) among controls (p = 0.3). The rate of delivery before 32 weeks was significantly lower (1/7 vs. 6/8, p = 0.03) and the duration of neonatal hospital admission significantly shorter (median 3 vs. 37 days, p = 0.001) in the amnioreduction group than among controls. The amount of amniotic fluid withdrawn ranged from 220 to 340 mL. These findings suggest that amnioreduction at the time of emergency cerclage placement is associated with a lower rate of extreme prematurity and related neonatal morbidity.

Adult↗

Hepatitis C virus infection is associated with a higher incidence of cholestasis of pregnancy.

To investigate a possible relationship between hepatitis C virus infection and cholestasis of pregnancy, we identified all cases of cholestasis of pregnancy (145/16,271) and hepatitis C virus infection (63/16,271) between January 1992 and December 1997. Serologic screening was performed universally. The rate of cholestasis of pregnancy was greater in women whose hepatitis C virus antibodies were positive rather than negative [15.9% (10/63) vs 0.8% (135/16,208), P < 0.001]. Among women with cholestasis of pregnancy, mean (standard deviation) gestational age at onset of symptoms and at delivery was significantly lower among women whose hepatitis C virus antibodies were positive compared with negative women: 28.9 (3.2) vs 34.3 (3.5) weeks, P < 0.001 and 36.3 (0.9) vs 37.0 (1.6) weeks, P = 0.03, respectively. These findings suggest that early occurrence of cholestasis of pregnancy may be an indication for serologic testing for hepatitis C virus.

Cholestasis↗

Avoidable mortality in Europe 1955-1994: a plea for prevention.

OBJECTIVE: To analyse trends of avoidable mortality in Europe, emphasising causes of death amenable to primary prevention through reduction of exposures, secondary prevention through early detection and treatment, and tertiary prevention through improved treatment and medical care. DESIGN: Descriptive study of mortality from avoidable causes for the years 1955 through 1994, for ages 5-64 at time of death. Using the World Health Organisation Mortality Database, five year death rates were standardised to the world population. SETTING: 21 countries of Europe in four regions (northern, central, and southern Europe, Nordic countries). PARTICIPANTS: All causes of deaths for men and women, aged 5-64, at time of death. MAIN RESULTS: Between 1955-59 and 1990-94, the reduction in mortality was somewhat greater for avoidable causes than for all causes: 45.8% v 45.1% (women) and 39.3% v 32.6% among men. Reductions in mortality were greater for causes amenable to improved medical care: 77.9% among women and 76.3% among men. The smallest reduction in mortality was seen in women for causes amenable to secondary prevention (11.0%), and in men for causes amendable to primary prevention including tobacco related conditions (16.6%). From a geographical point of view, there were slight differences in trends between European regions, but overall the patterns were similar. CONCLUSIONS: The greatest reduction of avoidable mortality in Europe from 1955-94 came from causes amenable to improved treatment and medical care for both sexes. Further reductions of avoidable mortality can be achieved through implementation of primary and secondary prevention activities, such as tobacco control, reduction of occupational exposures, and universal access to breast and cervical cancer screening programmes.

Adolescent↗

[Authors' experience with medical therapy of herpes genitalis in pregnancy].

BACKGROUND: Neonatal risk in herpes infections is very high: in the USA it is 1:2,000, in Japan 1:15,000 and in England 1:65,000. These differences seem to be due mostly to the different risk factors associated to the mother infection. The best strategy to cure herpes infection is to examine every patient during pregnancy and to identify the high risk ones. METHODS: In this study, 1,860 pregnant women have been submitted to a colposcopic and cytologic screening for the research of HSV. RESULTS: HSV was found in twenty (1.07%) women. Two groups have been made: the first with 14 HSV positive women at 3-6 months of pregnancy and second with 6 HSV positive women at eight months of pregnancy. Both groups were treated with acyclovir per os. The 14 women of the first group underwent vaginal delivery. The women of the second group underwent cesarean section. Only in 1 case a neonatal infection has been observed.

Acyclovir↗

[Incidence of CIN in HIV-positive women].

BACKGROUND: The aim of this study was to evaluate the incidence of CIN in HIV-seropositive women. METHODS: A group of 23 women with a mean age of 28 years was recluted. Three of them were clinically affected, and 20 were non-AIDS HIV-seropositive. The patients underwent cervical cytology, colposcopically directed biopsy and T-cell studies. In addition, HPV using the in vitro hybridization, was investigated. RESULTS: Eight of 23 patients (24.78%) had CIN. Patients with CIN had significantly lower CD4 cell counts and CD4/CD8 ratios than those without CIN. Patients with AIDS had higher grade lesions than those non-AIDS HIV-sero-positive. CONCLUSIONS: The data obtained suggest that abnormal cervical pathology is common among HIV seropositive women, and so cervical colposcopy should be part of the routine management of HIV-seropositive women.

Adult↗

[Diagnosis and therapy of CIN in pregnant women].

BACKGROUND: CIN is the most frequent neoplasm in pregnancy. At present, in Italy, Pap test and colposcopy are not included in routine examinations in prenatal visits. METHODS: In this study, we submitted 560 pregnant women to Pap test during prenatal visits. In case of abnormal or doubtful smears a colposcopy and target biopsy were performed. RESULTS: Of the 560 women studied, 124 had genital bleeding and the other 436 were asymptomatic. Six cases of CIN symptomatic women and 5 cases in the asymptomatic ones. In no cases we thought necessary a therapeutic operation. We limited the therapy to a follow-up. CONCLUSIONS: In our opinion, it is necessary to treat CIN during pregnancy.

Adolescent↗

[Psychological consequences in women with symptomatic HPV infection].

OBJECTIVE: Evaluation of psychological and social aspects of women with diagnosed genital HPV-infection. EXPERIMENTAL DESIGN: A retrospective study of 40 women with a diagnosis of HPV-genital infection has been made. INTERVENTIONS AND MEASURES: A questionnaire for gathering information on social life, sexuality and emotional relationship with the partner was submitted to the patients. RESULTS: There is a high percentage of sexual impairments after diagnosis of HPV-infection. CONCLUSIONS: HPV infections, as many genital pathologies, lead to problems with sexuality as well as hypochondriac fears.

Adult↗

A case of malignant melanoma of the vagina during pregnancy: immunological problems.

BACKGROUND: A clinical case of malignant melanoma of the vagina diagnosed during late pregnancy is described. Prompt histological examination showed a malignant melanoma at an early stage. The treatment of choice for malignant melanoma is surgical exicision. At present we are trying to associate immunological and chemotherapeutic treatments with surgical ones. CASE: A 27-year-old primipara was diagnosed with malignant melanoma at 38 weeks' gestation. The patient underwent a cesarean section. Careful evaluation of the immunological characteristics of the patient induced us to treat the melanoma with human leukocyte alpha interferon. The result was an increase in T4 cells with respect to T8 cells, with an enhancement in the ratio of CD4 to CD8. CONCLUSION: The results suggest the immune system plays a major role in the modification and regulation of neoplasias of the genital tract.

Adult↗

Therapeutic protocol of vulvar and cervical HPV-infection.

BACKGROUND: The stages of HPV (Human Papilloma Virus) infection are under the control of the immune system, which is inhibited by the virus itself. Thus, at present the treatment of condyloma acuminata is based on the use of interferon (IFN). The aim of the present study was to evaluate immune system activation and clinical response to IFN therapy. In addition, in the most serious cases, medical treatment with IFN was associated with diathermocoagulation (DTC) of persistent warts. The effectiveness of the combined therapy was also assessed. METHODS: 7 women (age range: 16-52) suffering from cervix condylomata were selected for our study. All of them were injected intramuscularly with doses of 3 million UI of IFN-alpha leucocytar every three days for six weeks together with daily applications of alpha-IFN for six weeks. The women that were still ill three months after IFN therapy, were treated with DTC. In one case, another cycle of IFN treatment was necessary. RESULTS: Clinical response to IFN treatment was complete in 46 cases, partial in 20 cases and unsuccessful in 4 cases. After three months of medical therapy, 30 women were treated with DTC. After this therapy, in 21 cases, the warts were resolved. After 24 months the percentage of relapse was 37.9% when only IFN was used, and 4.51% when IFN was combined with DTC. CONCLUSIONS: These data suggest that a successful protocol for the treatment of condyloma acuminata consist of IFN therapy associated with DTC when warts persisted.

Adolescent↗

Role of ultrasonography in the early diagnosis of ovarian cancer.

BACKGROUND: Malign ovarian carcinomas are the main cause of death from gynaecological cancer. In fact, only in 30% of cases is it diagnosed at an early stage. In our study the possibility of an early diagnosis of the ovarian malignant neoplasia was evaluated. METHODS: One hundred and thirty-nine women with adnexal swelling were subjected to pelvic echography. The sample was selected during routine gynaecological checkups. RESULTS: All the cases showing a mass diameter exceeding 25 mm were classified as positive. Echotomography showed 129 cases of positive ovarian mass with an accurate diagnosis in 92.27%. Integrating the results of echography with those of radioimmunoassay an early diagnosis of ovarian cancer was achieved in 92.53 of the cases. CONCLUSIONS: A routine pelvic examination associated with pelvic echotomography represent an effective protocol for the diagnosis of ovarian cancer at an early stage.

Adult↗

Chemotherapy and cervical cancer: present trends.

A clinical case of cervical carcinoma Stage Ib is described. We treated a 48-year old woman with grade 2 carcinoma, using cisplatin at a dose of 40 mg/mq on the 1st and 4th days, bleomycin at a dose of 15 mg/mq on the 1st and 8th days, and anti-emetic for two cycles. On the basis of the low ratio T4/T8 we also administered along with chemotherapy, alpha natural interferon at a dose of 3,000,000 i.u. three times a week for four weeks. At the end of the chemotherapeutic treatment the lesion was reduced in size and the biopsy was pathognomically of a microinvasive cancer. In spite of the encouraging biopsy results, the patient was submitted to a simple hysterectomy, with random lymphoadenectomy. Today, two years after her treatment, the patient is free of disease. At present there is discussion as to the efficacy of neoadjuvant chemotherapy in the first stages of the neoplasia in relation to conventional treatment, which reserves chemotherapy to stages IV and IVb and to relapses, in the light of both the lesion and the disposability of the patient to treatment and successive follow-up.

Antineoplastic Combined Chemotherapy Protocols↗

[Association of interleukin 2 and interferon alpha in the management of cervical condylomatosis].

At present the therapy of cervical condylomatosis is based on the use of interferon because the HPV types responsable for condyloma inhibit the immunitary system. But many A. studying the effects of IFN have found that at high concentration it has an immunosuppressive action. The aim of the present study was to evaluate if interleukin-2 associated with IFN is useful in avoiding this negative effect by improving the efficacy of cervical condylomatosis therapy. We treated 25 women suffering from cervical condyloma with increasing doses of IL-2 injected intralesionally and associated with natural alpha-IFN injected intramuscularly. The duration of the whole therapy was six weeks. We evaluated the percentage of inflammatory cells in peripheral blood before and after treatment. The per-cent number of lymphocytes, eosinophils and lymphoblasts was increased by 27%, 88% and 40%, respectively. The clinical response to the therapy was total in 14 cases, partial in 9 cases and unsuccessful in 2 cases. These data suggested that combination therapy with interleukin-2 and alpha-IFN for the treatment of patients with cervix condylomatous is successful.

Adult↗