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Biomedical subjects

S Bartoli

Publications and source records attributed to S Bartoli.

At least 19 recordsLinked to original sources
PubMed1999

Long-term results and outcomes of crossover axilloaxillary bypass grafting: A 24-year experience.

OBJECTIVE: The outcome of crossover axilloaxillary bypass grafting in patients with stenosis or occlusion of the innominate or subclavian arteries was investigated. METHODS: The study was designed as a retrospective clinical study in a university hospital setting with 61 patients as the basis of the study. Fifty-eight patients (95.1%) had at least two risk factors or associated medical illnesses for atherosclerosis, and 35 patients (57.4%) had concomitant carotid artery stenosis that necessitated a staged procedure in 12 patients (19.7%). The patients underwent a total of 63 crossover axilloaxillary bypass grafting procedures. Demographics, risk factors and associated medical illnesses, preoperative symptoms and angiographic data, blood flow inversion in the vertebral artery, concomitant carotid artery disease, graft shape, caliber and material, and intraoperative and postoperative complications were studied to assess the specific influence in determining the outcome. RESULTS: One postoperative death (1.6%), four early graft thromboses (6.2%), and six minor complications (9. 8%) occurred. The overall mortality and morbidity rates were 1.6% and 16.1%, respectively. During the follow-up period (mean, 97.3 +/- 7.9 months), we observed five graft thromboses (8.3%). Primary and secondary patency rates at 5 and 10 years were 86.5% and 82.8% and 88.1% and 84.3%, respectively. Overall, two patients (3.3%) had recurrence of upper limb symptoms and none had recurrence of symptoms in the carotid or vertebrobasilar territory. The 5-year and 10-year symptom-free interval rates were 97.7% and 93.5%, respectively. Nine patients (15%) died of unrelated causes. The 5-year and 10-year survival rates were 93.2% and 67.3%, respectively. Multivariate analysis showed that no specific variables exerted an influence in the short-term and long-term results and the outcome. CONCLUSION: The optimal outcome of axilloaxillary bypass grafting supports its use as the most valuable surgical alternative to transthoracic anatomic reconstructions for innominate lesion, long stenosis of the subclavian artery, and short subclavian artery stenosis associated with ispilateral carotid artery lesions.

Adult↗
PubMed1995

Retrograde cerebral perfusion during profound hypothermia and circulatory arrest in pigs.

The purpose of this study was to evaluate the use of retrograde cerebral perfusion via the superior vena cava during profound hypothermia and circulatory arrest (CA) in pigs. In three groups of 5 pigs each, group A (control) underwent cardiopulmonary bypass and normothermic CA for 1 hour, group B underwent cardiopulmonary bypass, profound hypothermia, and CA (15 degrees C nasopharyngeal) for 1 hour, and group C underwent the same procedure as group B plus retrograde cerebral perfusion. In group A none awoke. In group B, 2 of 5 did not awake and 3 of 5 awoke unable to stand, 2 with perceptive hind limb movement and 1 moving all extremities. In group C all awoke, 4 of 5 able to stand and 1 of 5 unable to stand but moving all limbs. In neurologic evaluation group B had significantly lower Tarlov scores than group C (p = 0.0090). Group B mean wake-up time, plus or minus standard error of the mean, was 124.6 +/- 4.6 minutes versus 29.2 +/- 5.1 in group C (p = 0.0090). In group B late phase CA cerebral blood flow dropped 30.9% +/- 4.8%, but in group C it rose 24.7% +/- 9.3% (p = 0.0007, pooled variance t test, two-tailed). In group B late phase CA brain oxygenation decreased 46.0% +/- 13.9% but it increased 26.1% +/- 5.4% in group C (p = 0.0013). This difference was reduced somewhat during rewarming (B, -21.2% +/- 14.9%; C, 16.4% +/- 4.7%; p = 0.043). Group B rewarming jugular venous O2 saturation was 30.8% +/- 2.5% versus 56.0% +/- 4.4% in group C (p = 0.0011). We conclude that in pigs retrograde cerebral perfusion combined with profound hypothermia during CA significantly reduces neurologic dysfunction, providing superior brain protection.

Animals↗
PubMed1995

1,2-Dibromoethane as an initiating agent for cell transformation.

The two-stage transformation assay increases the sensitivity of cells to chemicals and permits detection of carcinogens acting as initiating agents. 1,2-Dibromoethane, a representative halogenated aliphatic, has been tested in the two-stage BALB/c 3T3 cells transformation test at dosage from 16 microM to 128 microM. This dose range is much lower than those previously found efficient in transforming BALB/c 3T3 cells. Apart from the lowest dose, which induced borderline effects, all the other assayed dosages appeared to induce heritable changes in the target cells. The initiated cells were revealed as fully transformed foci both in the combination with a chronic promoting treatment and also by allowing cells to perform more rounds of cell replication. The results clearly show that 1,2-dibromoethane can act as an initiator of cell transformation.

3T3 Cells↗
PubMed1995

Dipyridamole echocardiography and 99mTc-MIBI spect dipyridamole scintigraphy for cardiac evaluation prior to peripheral vascular surgery.

Coronary artery disease accounts for most of the early and late mortality and morbidity associated with vascular surgery. Cardiac pre-operative evaluation is mandatory for the assessment of cardiac risk. The aim of this study is to compare dipyridamole scintigraphy with 99mTc-MIBI (MIBI-dipy) and dipyridamole echocardiography (ECHO-dipy) and to evaluate their capability in identifying cardiac risk for strong events such as death, unstable angina or myocardial infarction. METHODS. Sixty consecutive patients (mean age 67 +/- 7) were enrolled. 52 performed ECHO-dipy, 51 MIBI-dipy. 40 patients went to aorto-femoral or aorto-iliac graft replacement and 15 to vascular angioplasty. Five patients did not undergo surgery. RESULTS. Eighteen patients (30%) had stress defects and 9 patients also rest defects with MIBI-dipy. Six patients new asinergic areas at ECHO-dipy. Three pts died in the first year follow-up for a cerebrovascular event, a myocardial infarction and a sudden death respectively. Sensitivity and specificity, positive and negative predictive value were 100%, 69%, 16%, 100% for MIBI-dipy and 66%, 94%, 40%, 98% for ECHO-dipy. CONCLUSIONS. As other authors reported, stress scintigraphy is a pre-operative test showing high sensitivity but with no satisfying specificity. Stress echocardiography, in our population, can produce a good negative predictive value. It is a less expensive and widespread clinical tool useful in the evaluation of preoperative patients. Its positive predictive power is not satisfying but it is shared with all non-invasive pre-operative tests available now.

Aged↗
PubMed1994

Neurologic deficit in patients at high risk with thoracoabdominal aortic aneurysms: the role of cerebral spinal fluid drainage and distal aortic perfusion.

PURPOSE: This prospective study evaluated the possible prevention of postoperative neurologic deficit in patients at high risk with thoracoabdominal aortic aneurysms (TAAA), types I and II, by use of perioperative cerebrospinal fluid drainage and distal aortic perfusion. METHODS: Between September 18, 1992, and August 8, 1993, 45 consecutive patients underwent TAAA repair (14 type I, 31 type II). Thirty-six were men and nine were women. The median age was 63 years (range 28 to 88). Twenty-four of 45 patients (53%) had dissection and 17 of 45 (38%) had prior proximal aortic replacement. All patients underwent perioperative cerebrospinal fluid drainage and distal aortic perfusion. Median aortic clamping time was 42 minutes. Thirty-five of 45 patients (78%) underwent intercostal artery reattachment. RESULTS: The 30-day survival rate was 96% (43 of 45 patients). Early neurologic deficit occurred in two of 45 patients (4%), and late neurologic deficit also occurred in two of 45 patients (4%). We compared the neurologic deficit of our current group of 45 patients with the data of a previously unpublished study of 112 patients also from this center. Total neurologic deficit for the current group was four of 45 (9%) versus the previous group of 35 of 112 (31%) with a p value of 0.0034 (Pearson chi-square test). Neurologic deficit for patients with type I TAAA was 0 of 14 (0%) versus 15 of 73 (21%) (p = 0.062); for patients with type II TAAA 4 of 31 (13%) versus 20 of 39 (51%) (p = 0.0008). In patients with aortic dissection, neurologic deficit was 3 of 24 (12%) versus 9 of 32 (28%) (p = 0.0304); no dissection was 1 of 21 (5%) versus 26 of 80 (32%) (p = 0.011). For aortic clamp times less than 45 minutes, neurologic deficit was 1 of 24 (4%) versus 14 of 68 (21%) (p = 0.061); for aortic clamp times equal to or greater than 45 minutes, neurologic deficit was 3 of 21 (14%) versus 21 of 44 (48%) (p = 0.0090). CONCLUSION: Neurologic deficit in patients treated for types I and II TAAA was reduced significantly by perioperative cerebral spinal fluid drainage and distal aortic perfusion.

Adult↗
PubMed1992

Initiating activity of 1,1,2,2-tetrachloroethane in two-stage BALB/c 3T3 cell transformation.

By using in vitro two-stage BALB/c 3T3 cell transformation assay, we have tested the effect of promoting treatment with tetradecanoylphorbol acetate (TPA) on transformation induced by 1,1,2,2-tetrachloroethane (1,1,2,2-TTCE). Cells were treated with subeffective or transforming concentrations of 1,1,2,2-TTCE in the presence of an S9-mix activating system, followed by TPA promoting treatment. The transforming activity of 1,1,2,2-TTCE is evident only by reseeding confluent cells and allowing additional rounds of cell replications in the amplification test. Treatment with TPA leads to a marked transformation yield in all plates scored even at the lowest assayed dosage of 1,1,2,2-TTCE, without performing amplification of transformation.

3T3 Cells↗
PubMed1992

In vivo and in vitro interaction of trichloroethylene with macromolecules from various organs of rat and mouse.

Trichloroethylene was covalently bound in vivo to DNA, RNA and proteins of rat and mouse organs 22 hr after ip injection. The covalent binding index values of rat and mouse liver DNA classify trichloroethylene as a weak initiator. Labeling of RNA and proteins from various organs of both species was higher than that of DNA. In vitro, trichloroethylene was bioactivated by microsomal fractions dependent on cytochrome P450, mainly from liver of both species, to intermediate(s) capable of binding to exogenous DNA. No particular species-specific difference was evident except for mouse lung microsomes which were more efficient than rat lung microsomes. GSH-transferases capable of bioactivating P450-dependent were present in mouse lung microsomes and in liver microsomes of both species. These data, along those previously reported, provide sufficient evidence for a weak ability of TCY to interact covalently with DNA.

Animals↗
PubMed1992

[Surgical day hospital: technical possibilities and organizational model].

The Authors propose an organizational model for a surgical day hospital program, which is being used for a pilot day surgery unit in the I Department of Surgery of the Rome University "La Sapienza". The program requires little capital investment, as it is closely linked, geographically and administratively, to the main surgical unit, and uses the present staff, facilities and support services. The model is based on a computerized LAN (Local Area Network), providing fast recording, scheduling, management and trannsfer of medical data for each patient. The present situation is reported in detail. Data from the authors' outpatient department for 1988, have been recorded and elaborated. The results show a low use of surgical day care, limited to minor surgical procedures, and with not a single operation performed under general anesthesia. The authors hope to see a growth in the use of day surgery and a more selective use of inpatient care.

Adolescent↗
PubMed1991

Chloroform bioactivation leading to nucleic acids binding.

Chloroform was bound covalently to DNA, RNA and proteins of rat and mouse organs in vivo after i.p. injection. Covalent Binding Index values of rat and mouse liver DNA classify chloroform as a weak initiator. Labelings of RNA and proteins from various organs of both species were higher than that of DNA. In an in vitro cell-free system, chloroform was bioactivated by cytochrome P450-dependent microsomal fractions, by cytosolic GSH-transferases from rat and mouse liver, and particularly by the latter enzymes from mouse lung. This observation suggests that GSH plays a role in the binding of chloroform metabolites to DNA. The presence of both microsomal and cytosolic enzymatic systems in the standard incubation mixture generally led to an additive or synergistic bioactivating effect for rat and mouse, respectively.

Animals↗
PubMed1991

DNA damaging activity of methyl parathion.

14C-methyl parathion was covalently bound to DNA, RNA and proteins of various rat and mouse organs 22 hr after i.p. injection. Covalent binding index (CBI) to liver DNA was low in both species and typical of weak initiators. The labelings of RNA and proteins from different organs of both species was slightly higher than DNA binding. No interaction with brain nucleic acids was observed (CBI detection limit: 2.8). The in vitro enzyme-mediated interaction of methyl parathion with calf thymus DNA was mainly performed by rodent liver microsomes and, to a lesser extent, by microsomes from mouse kidney and lung whereas brain microsomes were inefficient. Activation of methyl parathion by cytosolic fractions from different organs of both species to form(s) capable of binding to DNA was negligible. When microsomes and cytosolic fractions from rodent liver and lung or mouse kidney were simultaneously present in the incubation mixture, a synergistic effect in catalyzing DNA binding was observed. The extent of DNA binding was reduced by adding SKF 525-A to the microsomal standard incubation mixture, whereas it was enhanced by adding GSH to liver or lung murine microsomes or to mouse kidney microsomes. These results suggest that methyl parathion is bioactivated by P450-dependent microsomal mixed function oxidase system and by microsomal GSH-transferases. By contrast, cytosolic GSH- transferases play a detoxificant role in the metabolism of this compound.

Animals↗
PubMed1991

Factors influencing the rupture of abdominal aortic aneurysms.

The gross findings of 49,144 autopsies performed at two major hospitals in Rome were reviewed. There were 297 patients who were found to have atherosclerotic abdominal aortic aneurysm (AAA). The aneurysm was intact in 220 (74 per cent) and ruptured in 77 (26 per cent). The occurrence of aneurysm rupture was correlated to 17 variables by univariate and multivariate statistical analysis. Covariates found to be independently predictive of the rupture of AAA were the size of the aneurysm (p less than 0.001), arterial hypertension (p less than 0.001) and the presence of bronchiectasis (p less than 0.025.). Over-all, bronchiectasis was more common among patients with AAA than in the age-adjusted and sex-adjusted control population. The simultaneous presence of bronchiectasis and AAA suggests the presence of some inherited or acquired tendency to have ectasia of the connective tissue, aneurysm formation and rupture development.

Adult↗
PubMed1991

[Primary hepatic leiomyoma].

A young woman of 34 years old had an asymptomatic intrahepatic mass. The histological diagnosis, performed after a right lobe hepatectomy, was of leiomyoma of the liver.

Adult↗
PubMed1990

In vivo and in vitro interaction of 1,2-dichlorobenzene with nucleic acids and proteins of mice and rats.

Twenty-two hours after i.p. injection into male Wistar rats and BALB/c mice, 1,2-dichlorobenzene (1,2-DCB) was covalently bound to DNA, RNA, and proteins of liver, kidney, lung and stomach. The covalent binding index to liver DNA was typical of carcinogens classified as weak initiators. The enzyme-mediated in vitro interaction of 1,2-DCB with calf thymus DNA of synthetic polyribonucleotides was carried out by a microsomal mixed-function oxidase system and microsomal GSH-transferases, which seemed to be effective only in liver and lung of rat and mouse. Cytosolic GSH-transferases played a minor role in 1,2-DCB bioactivation. The latter finding provides the first evidence of 1,2-DCB genotoxicity in mammalian cells. The type of halide, the number of halosubstituents and their spatial disposition on the benzene ring are the major determinants of halobenzenes activability to intermediate(s) capable of interacting covalently with DNA and other macromolecules in biologic systems.

Animals↗
PubMed1990

The covalent interaction of 1,4-dibromobenzene with rat and mouse nucleic acids: in vivo and in vitro studies.

1,4-Dibromobenzene (1,4-DBB) was covalently bound to DNA from liver, kidney, lung and stomach of mice after intraperitoneal administration. The covalent binding index (CBI) value (23 in mouse liver) was typical of weak initiators. On the contrary, no interaction with DNA from rat organs was observed (CBI detection limit: 1.3-2.6). The in vitro interaction of 1,4-DBB with calf thymus DNA was mediated mainly by microsomes, especially those from liver of both species and from mouse lung. Mouse subcellular fractions were more active then rat subcellular fractions. Unlike liver cytosol, subcellular cytosolic fractions from lung, kidney and stomach were capable of bioactivating 1,4-DBB, although to a lesser extent than liver microsomes. Both cytochrome P-450 and GSH-transferases are involved in 1,4-DBB bioactivation.

Animals↗
PubMed1989

The different genotoxicity of p-dichlorobenzene in mouse and rat: measurement of the in vivo and in vitro covalent interaction with nucleic acids.

Twenty-two hours after i.p. injection to male Wistar rats and BALB/c mice para-dichlorobenzene (p-DCB) is bound covalently to DNA from liver, kidney, lung and stomach of mice but not of rats. DNA adducts in mouse liver are repaired in seventy-two hours. The covalent binding index value, calculated on the labelling of mouse liver DNA, classifies p-DCB as a weak initiator with an oncogenic activity lower than that of chlorobenzene. The labelling of RNA and proteins from the different organs of both species is, however, low. In vitro interaction with calf thymus DNA mediated by mouse and rat microsomes from liver and lung did occur. Binding extent was strongly reduced by addition of 2-diethylaminoethyl-2,2-diphenylvalerate hydrochloride (SKF 525-A) to the microsomal standard incubation mixture, whereas it was enhanced by adding GSH. Cytosolic fractions from kidney and lung were able to induce binding of p-DCB to DNA to a lower extent with respect to microsome-mediated binding. These results indicate that microsomal mixed function oxidase system and microsomal GSH-transferases can be involved in overall activating metabolism whereas cytosolic GSH-transferases play a minor role. This study, which is a part of a structure-activity relationship approach on benzene and its haloderivatives, provides the first evidence of genotoxicity of p-DCB in mammalian cell. It allows to partly explain variations of susceptibility of different species to hepatocarcinogenesis and of hepatotoxicity of different isomers.

Animals↗
PubMed1989

Covalent binding of 1,1,1,2-tetrachloroethane to nucleic acids as evidence of genotoxic activity.

Twenty-two hours after ip administration to male Wistar rats and BALB/c mice, 1,1,1,2-tetrachloroethane (1,1,1,2-TTCE) is bound covalently to DNA, RNA, and proteins of liver, lung, kidney, and stomach. The in vivo reactivity leads to binding values to DNA generally higher in mouse organs than in rat organs. The covalent binding index (CBI) values (82 in mouse liver DNA and 40 in rat liver DNA) classify 1,1,1,2-TTCE as a weak to moderate initiator. Both microsomal and cytosolic enzymatic systems from rat and mouse organs are capable of bioactivating 1,1,1,2-TTCE in vitro. Liver fractions are the most effective. When the activating systems are simultaneously present in the incubation mixture a synergistic effect is observed. Unlike the related chemical 1,1,2,2-tetrachloroethane (1,1,2,2-TTCE), which is bioactivated only through an oxidative route, 1,1,1,2-TTCE metabolism is carried on by oxidative and reductive pathways, both dependent on cytochrome P-450. 1,1,1,2-TTCE is also bioactivated by microsomal GSH-transferases from liver and lung. These data further confirm that correlations exist between structure and genotoxic activity of halocompounds.

Animals↗