Validity of shape memory NiTi colon ring BioDynamix ColonRing™ (or NiTi CAR 27™) to prevent anastomotic colorectal strictures. Preliminary results.

PURPOSE: Anastomotic strictures occur in 3-30% of colorectal anastomosis and one of the main causes may be a reaction to the presence of the metal staples used for suturing. The aim of this study was to evaluate the efficacy of a compression anastomosis ring using the memory shaped device in initial, i.e. nickel-titanium alloy (NiTi) for the prevention of colorectal anastomotic strictures. PATIENTS AND METHODS: A compression anastomosis ring device (NiTi CAR 27™) was used to perform compression anastomosis in 20 patients underwent left hemicolectomy and anterior resection of the rectum for carcinoma. An endoscopic check of the anastomosis was carried out at one month and at six months after surgery. RESULTS: In 2 patients (10%) a dehiscence of the anastomosis occurred on the fifth and the eighth postoperative day. No anastomotic strictures were observed in any of the other 18 patients at six months follow-up after surgery. CONCLUSION: Our preliminary results suggest that the use of a compression anastomosis ring might well be a valid method of preventing anastomotic strictures in colorectal surgery. Further studies involving a larger number of patients are needed in order to confirm these preliminary results.

Molecular detection of TP53, Ki-Ras and p16INK4A promoter methylation in plasma of patients with colorectal cancer and its association with prognosis. Results of a 3-year GOIM (Gruppo Oncologico dell'Italia Meridionale) prospective study.

BACKGROUND: Despite the improvement in detection and surgical therapy in the last years, the outcome of patients affected by colorectal carcinoma (CRC) remains limited by metastatic relapse. The aim of this study was to investigate the presence of free tumor DNA in the plasma of CRC patients in order to understand its possible prognostic role. PATIENTS AND METHODS: Ki-Ras, TP53 mutations and p16(INK4A) methylation status were prospectively evaluated in tumor tissues and plasma of 66 CRC patients. RESULTS: In 50 of the 66 primitive tumor cases (76%) at least one significant alteration was identified in Ki-Ras and/or TP53 and/or p16(INK4A) genes. Eighteen of the 50 patients presented the same alteration both in the plasma and in the tumor tissue. At univariate analysis, Ki-Ras mutations proved to be significantly related to quicker relapse (P <0.01), whereas only a trend towards statistical significance (P = 0.083) was observed for the TP53 mutations CONCLUSIONS: Detection of Ki-Ras and TP53 mutation in plasma should be significantly related to disease recurrence. These data suggest that patients with a high risk of recurrence can be identified by means of the analysis of tumor-derived plasma DNA with the use of fairly non-invasive techniques.

Significance of P16INK4A hypermethylation gene in primary head/neck and colorectal tumors: it is a specific tissue event? Results of a 3-year GOIM (Gruppo Oncologico dell'Italia Meridionale) prospective study.

BACKGROUND: Methylation of the p16 promoter is one of the most frequent mechanisms of gene inactivation; its incidence is extremely variable according to the type of tumor involved. Our purpose was to analyze the hypermethylation of the p16 promoter in laryngeal squamous cell carcinomas (LSCC), salivary gland (SG) tumors and in colorectal cancer (CRC), to detect any possible association with the clinicopathological features and to determine the prognostic significance of the p16 gene in the tumors analyzed. PATIENTS AND METHODS: The hypermethylation of the p16 promoter was prospectively analyzed, by MSP, in a consecutive series of 64 locally advanced LSCC patients, in a consecutive series of 33 SG tumor patients and in a consecutive series of 66 sporadic CRC patients. RESULTS: Hypermethylation was observed in 9% of the LSCC cases, in all cases of SG cancer and in 21% of the CRC cases. No significant association was observed between p16 hypermethylation and clinicopathological variables in all the tissue samples analyzed. Moreover at univariate analysis p16 mutations were not independently related at disease relapse and death in LSCC and CRC. CONCLUSIONS: The results of this study suggest that the lack of p16 function could happen in advanced stage of SG tumors.

Specific TP53 and/or Ki-ras mutations as independent predictors of clinical outcome in sporadic colorectal adenocarcinomas: results of a 5-year Gruppo Oncologico dell'Italia Meridionale (GOIM) prospective study.

BACKGROUND: Although Ki-ras and TP53 mutations have probably been the genetic abnormalities most exhaustively implicated and studied in colorectal cancer (CRC) progression, their significance in terms of disease relapse and overall survival has not yet clearly been established. PATIENTS AND METHODS: A prospective study was carried out on paired tumor and normal colon tissue samples from a consecutive series of 160 previously-untreated patients, undergoing resective surgery for primary operable sporadic CRC. Mutations within the TP53 (exons 5-8) and Ki-ras (exon 2) genes were detected by PCR-SSCP analyses following sequencing. RESULTS: Mutation analyses of exons 5 to 8 of the TP53 gene showed mutations in 43% (68/160) of the cases, while mutation analyses of exon 2 of the Ki-ras gene showed mutations in 46% (74/160) of the cases. Multivariate analyses showed that clinical outcome were strongly associated with the presence of specific TP53 mutations in L3 domain alone (only in DFS) or in combination with specific Ki-ras mutations at codon 13. CONCLUSION: Specific TP53 mutations in L3 domain alone (only in DFS) or in combination with specific Ki-ras mutations at codon 13 are associated with a worse prognosis in sporadic CRC.

Weekly docetaxel as II line therapy in non-small cell lung cancer: an interim analysis of a phase II study.

To evaluate the efficacy and toxicity of weekly docetaxel (D) as II line treatment in non-small cell lung cancer (NSCLC), in November 1999, we started a phase II study on advanced (stages IIIB-IV) NSCLC patients pre-treated with at least one platinum-based chemotherapy regimen with or without radiotherapy. The schedule consisted of D 40 mg/m(2), weekly for 6 weeks, followed by a rest period of 2 weeks, for three cycles or until progression. Eligibility criteria were: histopathologic diagnosis of NSCLC; age

DNA ploidy and S-phase fraction, but not p53 or NM23-H1 expression, predict outcome in colorectal cancer patients. Result of a 5-year prospective study.

PURPOSE: The aim of this study was to determine TP53 and NM23-H1 immunoreactivity, DNA ploidy, and S-phase fraction (SPF) in a series of 160 patients undergoing resective surgery for primary operable colorectal cancer (CRC) and to establish whether these alterations have any clinical value in predicting CRC patients' prognosis. METHODS: TP53 and NM23-H1 expressions were evaluated on paraffin-embedded tissue by immunohistochemistry and DNA-ploidy and SPF on frozen tissue by flow-cytometric analysis. RESULTS: The median follow-up time in our study group was 71 months (range 34-115 months). P53 protein expression was associated with distal tumors (P<0.05) and DNA aneuploid tumors (P<0.05) tumors. DNA-aneuploidy was associated with distal tumors (P<0.01), histological grade (G3) (P<0.05), advanced Dukes' stage (C and D) (P<0.01), lymph node metastases (P<0.01) and high SPF (>18.3%) (P<0.01). The major significant predictors for both disease relapse and death were advanced Dukes' stage, DNA-aneuploidy, and high SPF, while lymphohematic invasion was the only independent factor for relapse and non-curative resection for death. CONCLUSIONS: Our results indicate that DNA aneuploidy and high SPF are associated in CRC with a poor clinical 5-year outcome, while in contrast the prognostic role of TP53 and NM23-H1 expression is still to be clarified.

Feasibility of telementoring between Baltimore (USA) and Rome (Italy): the first five cases.

BACKGROUND AND PURPOSE: Telemedicine is the use of telecommunication technology to deliver healthcare. Telementoring has been developed to allow a surgeon at a remote site to offer guidance and assistance to a less-experienced surgeon. We report on our experience during laparoscopic urologic procedures with mentoring between Rome, Italy, and Baltimore, USA. MATERIAL AND METHODS: Over a period of 3 months, two laparoscopic left spermatic vein ligations, one retroperitoneal renal biopsy, one laparoscopic nephrectomy, and one percutaneous access to the kidney were telementored. Transperitoneal laparoscopic cases were performed with the use of AESOP, a robotic for remote manipulation of the endoscopic camera. A second robot, PAKY, was used to perform radiologically guided needle orientation and insertion for percutaneous renal access. In addition to controlling the robotic devices, the system provided real-time video display for either the laparoscope or an externally mounted camera located in the operating room, full duplex audio, telestration over live video, and access to electrocautery for tissue cutting or hemostasis. RESULTS: All procedures were accomplished with an uneventful postoperative course. One technical failure occurred because the robotic device was not properly positioned on the operating table. The round-trip delay of image transmission was less than 1 second. CONCLUSION: International telementoring is a feasible technique that can enhance surgeon education and decrease the likelihood of complications attributable to inexperience with new operative techniques.

[Proximal anastomosis in aorto-bifemoral bypass. Technical considerations]. / L'anastomosi prossimale nel by-pass aorto-bifemorale. Considerazioni tecniche.

Aorto-bifemoral bypass is the commonest way to correct stenotico-obstructive lesions of the aorto-iliac district. The problem of proximal anastomosis is examined by considering the advantages and disadvantages of the two types of anastomosis: end-to-end and end-to-side. On the basis of reported results and personal experience based on the use of end-to-side anastomosis, it is concluded that this is to be preferred over end-to-end, especially in view of the possibility offered by this procedure of maintaining the collateral circulations.

[Arterial hypertension after carotid endarterectomy]. / L'ipertensione arteriosa dopo intervento di endoarteriectomia carotidea.

Arterial hypertension as a consequence of carotid endarterectomy is a relatively frequent event and potentially dangerous because of the development of central postoperative neurological deficiency. The main pathogenetic theories are reviewed, with reference to hypotensive phenomena and preventive action also. Stress is laid on the importance of recognising potential risk factors, such as the use of anaesthetics which interfere with cerebral flow self-regulation mechanisms, diabetes and atherosclerosis.

[A case of biliary ileus in a subject who had already undergone cholecystectomy]. / Su di un caso di ileo biliare in soggetto già colecistectomizzato.

A rare case of biliary ileus in an already cholecystectomized subject is reported. Apart from the rarity of the case, the failure to evidence a bilio-digestive fistula intraoperatively is pointed out and a trans-choledochal migration mechanism for the gallstone is hypothesised. After a short review of the main complications connected with this serious form of intestinal occlusion, stress is laid on the advisability of carrying out, especially in emergency situations, simple entero-lithotomy, confining more invasive surgery, such as the repair of the biliodigestive fistula or cholecystectomy to cases in which recurrent biliary pathology is evident.

[Surgical treatment of hemorrhoids using Milligan-Morgan technique. Survey of 366 cases]. / La terapia chirurgica delle emorroidi secondo Milligan-Morgan. Revisione casistica su 366 casi.

After a careful review of the Author's own case list and of the literature on this subject, Milligan-Morgans' technique is assessed and compared with different surgical techniques as far as early and late complications are concerned. The Authors conclude that the Milligan-Morgan technique is to be preferred because of its simplicity, safety and flexibility, particularly if associated with sphincterectomy, with or without rhagade, in order to prevent the cicatricial scars.

[Surgical treatment of thrombosis of the inferior vena cava]. / Il trattamento chirurgico delle trombosi della vena cava inferiore.

Personal experience of thromboses of the inferior vena cava is presented and pathogenetic and symptomatological aspects stressed. In addition, in relation to the results presented and reported data, it is concluded that the role of surgical therapy is fundamental to integrate the thrombolytic and anticoagulant treatment of these severe forms of deep venous thrombosis.

[Use of mechanical staplers in biliopancreatic diversion intervention]. / L'impiego delle suturatrici meccaniche nell'intervento di diversione biliopancreatica (BPD).

The use of mechanical staplers in general surgery and in particularity in biliopancreatic diversion (BPD) has led to a marked reduction in the duration of surgery, thus requiring shorter anesthesia times. In obese subjects this also serves to reduce the risks related to their particular clinical and metabolic conditions. The authors report their experience in 53 patients; in 26 cases automatic linear staplers were used to create the ileal-duodenal and gastric tomy only, whereas the entero-entero anastomosis and gastro-entero anastomosis were performed manually using a biliopancreatic diversion technique. In the remaining 27 cases the operation was performed exclusively using automatic staplers. The paper then examines the complications arising from the use of mechanical staplers, dividing them into early and late. Among the first were two episodes of GEA hemorrhage (7.4%) and an asymptomatic fistula again of the GEA (3.7%). The late complications only included two stenoses (7.4%) of the GEA, both resolved using endoscopic pneumatic dilation.

[Care of the patient after biliopancreatic diversion (BPD) surgery]. / L'assistenza al paziente operato di diversione biliopancreatica (BPD).

The authors report their experience in the care of severely obese patients undergoing biliopancreatic diversion (BPD) surgery. The success of this surgical technique not only depends on its correct application but also on correct postoperative management, both immediately and over time. After a short summary of the methods of management used immediately after surgery, the authors focus in greater detail on the most frequent complications in this type of surgery: these are divided into early and late. Among the former, the authors discuss thromboembolic disease, the most severe complications and bronchopneumonia disorders. The authors illustrate the methods of treating both as well as therapies for their prevention. The most frequent and potentially dangerous late complications are examined in detail: protein malnutrition, sideropenic anemia and diarrhea. Lastly, the authors underline the need for a constant rather than episodic approach to the problem of severe obesity since, in their opinion, only continuous and long term application ensures the best results with the fewest complications.

[Organization of a center for prevention and treatment of obesity]. / Organizzazione di un Centro per la prevenzione e cura dell'obesità.

Obesity, a pathology with a multifactorial etiopathogenesis currently has an incidence of around 6% in the adult population in Italy. Considering that this disease provokes a statistically significant reduction of life expectancy, there is an evidence need to create structures which can deal with this problem. For this purpose, the Centre for the prevention and cure of obesity was set up by the Department of Surgery and Anatomy at the University of Palermo in 1990. It makes use of the specialist skills of experts in internal medicine, dieticians, cardiologists, psychologists and surgeons. In particular the authors give a detailed description of the diagnostic iter used and the methods of follow-up adopted for patients undergoing biliopancreatic diversion (BPD) surgery. In conclusion, the authors emphasize the need for a multidisciplinary approach to this pathology since this is the only way of minimizing complications arising during BPD surgery and obtaining the best results.

[Role of intraoperative phlebography in the therapeutic approach of varicocele]. / Il ruolo della flebografia intraoperatoria nella tattica terapeutica del varicocele.

Personal experience of intraoperative anterograde phlebography of the internal spermatic vein is reported. The use of this technique is suggested for controlling the result of internal spermatic vein ligature in cases of type I varicocele according to Coolsaet, diagnosed by preoperative retrograde phlebography. Early data make it possible to conclude that intraoperative anterograde phlebography is a valuable aid in reducing the frequency of recurrences.

Pneumococcal endocarditis of subacute evolution.

With the development of penicillin, Streptococcus pneumoniae has become an uncommon cause of bacterial endocarditis in adults. Subacute manifestation of pneumococcal endocarditis has been reported a few times in the literature, but most reports define the disease as acute, severe, and having a high mortality rate. We report the case of a 58-year-old male with subacute bacterial endocarditis due to Streptococcus pneumoniae. We stress the low frequency of this agent as a cause of endocarditis and the atypical evolution of this case. The pathophysiology, clinical manifestations and evolution, and the therapeutical options for this type of infection are also discussed.

[Distal tubular acidosis. Description of a classic case and of a type 4 case in neonatal single kidney]. / Acidosi tubulare distale. Descrizione di un caso classico e di un caso di tipo 4 in rene unico neonatale.

During the last two years two babies with failure to thrive developed distal renal tubular acidosis (RTA). We report a female patient with classic RTA where the failure to thrive occurred from the 8th month of age associated with polyuria and polydipsia. A 45 day old infant had RTA type 4 associated with unilateral renal agenesis; type 4-RTA is characterized by inadequate urinary potassium excretion in the face of hyperkalemia, in distinct contrast to the other type of RTA in which enhanced kaliuria is observed. Treatment with oral bicarbonate resulted in sustained normalization of blood acid-base status and accelerated linear growth in both babies.

[Neonatal oxygen therapy. Monitoring of PO2 by using capillary microsample]. / L'ossigenoterapia neonatale. Monitoraggio della PO2 con microprelievo capillare.

Capillary blood obtained from puncture of a warmed heel was tested for PO2 monitoring in management of 31 infants (1215-3920 g) with perinatal asphyxia and/or RDS. PO2 means during O2 administration were referred to mean values +/- I sigma for 108 normal term infants. All infants survived, with only a neurological complication due to a severe RDS with pneumothorax during CPAP treatment. We confirm the reliability of capillary microsampling collected blood for PO2 monitoring in RDS management too.

[Disorders of acid-base equilibrium in neonatal physiologic jaundice]. / Anomalie dell'equilibrio acido-base nell'ittero fisiologico neonatale.

38 healthy term jaundiced infants were tested. On 3rd day of life we obtained a blood sample from a peripheric vein to determine red blood cells and reticulocytes count, serum albumin, total, conjugated and unconjugate bilirubin. On 3rd, 4th, 5th, 6th day of life 4 standard heparinized microtubes were filled after lancing the heel: 2 microtubes to estimate the mean value of total bilirubin, 2 for the mean value of pH. The urine pH was evaluated every morning. The results of total bilirubin (T.B.), pH, pCO2 and Base Deficit were analyzed using T-test. All tested infants were free-bilirubin jaundiced. Infants treated with phototherapy had a T.B. ranging from 15.2 mg/dl on 3rd day of life to 10.5 mg/dl on 6th, while in controlled infants T.B. never exceeded 10 mg/dl. In treated infants the pH was higher than in controlled ones: p was less than 0.001 on 4th day, less than 0.005 on 5th day and less than 0.001 on 6th day. In both groups the urine pH ranged from 5 to 6.5 every day. The marked increase in respiratory rate during phototherapy is a well known side effect. But a significant decrease in pCO2 was present before starting phototherapy. A mixed disturbance of acid-base balance could be suspected: an already existing mild metabolic acidosis in phototherapy group with respiratory alkalosis due to anion gap variety, with unknown determining causes. We relate the initial metabolic acidosis to the depressed oxidative phosphorylation (with lactic acidosis) in the neonatal liver.(ABSTRACT TRUNCATED AT 250 WORDS)