Penetrating chest gunshot wounds: conservative treatment.

Gunshot wounds, and in particular chest gunshot wounds, are becoming a growing problem in daily practice at many hospitals. Many authors propose a conservative attitude in certain cases. We present a patient with a chest gunshot wound successfully solved under conservative means and videothoracoscopic removal of the bullet.

Colonic carcinogenesis in vagotomyzed rats.

INTRODUCTION: An increased incidence of colorectal cancer (CRC) has been reported in patients with peptic ulcer disease treated with truncal vagotomy. Inhibition of gastric acid output and its hormonal consequence, hypergastrinemia, have been considered risk factors for the development of CRC. The aim of the present study was to determine whether truncal vagotomy increases, in the short (7 days) and long term (120 days), the incidence of CRC in a model of carcinogenesis. MATERIAL AND METHOD: We used 86 Wistar rats distributed in 7 groups to which DMH (1,2-dimethylhydrazine dihydrochloride) was administered for the induction of colon tumors, at doses of 5 and 20 mg/kg of weight. The first three groups were used as control groups; the rats of the four other groups underwent a truncal vagotomy with pyloroplasty and Heller myotomy prior to the administration of DMH. Finally, we compared the incidence of colonic tumors in vagotomized vs non-vagotomized groups receiving the same dose of DMH. RESULTS: In the non-vagotomized rats that received low doses of DMH (5 mg/kg of weight), mortality was 0% and 0% developed cancer as compared to 40% and 0%, respectively, of rats vagotomized 7 days before the administration of DMH and 20% and 0%, respectively, of rats vagotomized 120 days before the administration of DMH. After the administration of high doses of DMH, mortality was 50% and 80% developed cancer as compared to 100% and 0%, respectively, of rats vagotomized 7 days before the administration of DMH and 61.11% and 42.8%, respectively, of rats vagotomized 120 days before the administration of DMH. CONCLUSION: Truncal vagotomy does not increase the incidence of CRC induced by DMH in the rat.

[Experimental acute pancreatitis in the rat. The quantification of pancreatic necrosis after the retrograde ductal injection of sodium taurocholate]. / Pancreatitis aguda experimental en la rata. Cuantificación de la necrosis pancreática tras la inyección retrógrada ductal de taurocolato sódico.

Acute haemorrhagic pancreatitis was induced in rats by injecting 5% sodium taurocholate into the common biliopancreatic duct. The condition was associated with an increase in the serum amylase levels as well as progressive pancreatic necrosis resulting in 100% mortality before 36 hours. This experimental model was documented by quantifying nine different parameters of pancreatic necrosis and giving more information about the induced lesion. The extent of pancreatic necrosis was evaluated at different intervals, 5.77% at 12 hours, 14.9% at 24 hours, and the rats died before 36 hours of pancreatitis induction with an average percentual necrosis of 29.9%. This model seems suitable for more pathogenic as well as therapeutic studies on acute pancreatitis in the rat.

[Somatostatin in the treatment of established and severe acute pancreatitis in the rat]. / Somatostatina en el tratamiento de la pancreatitis aguda establecida y severa en la rata.

The effects of somatostatin (SS) on the treatment of acute pancreatitis were studied in rats. Acute pancreatitis was established by injecting 5% sodium taurocholate in the biliopancreatic duct. Previously, pancreatic necrosis was determined in this experimental model at several intervals without treatment. Treatment was started according different groups: at 12, 16 and 20 hours after induction of acute pancreatitis (IV bolus of 4 ug/kg body weight followed by a 24h continuous infusion of 4 ug/kg body wt/hour). When somatostatin was initiated at 12 or 16h a decrease in serum amylase and lactodehydrogenase was observed, as well as in pancreatic necrosis resulting in 0% mortality after 24h of treatment. When somatostatin was started at 20h there was no changes in the lethal outcome of the disease.

Recurrence pattern of esophageal cancer after esophagectomy with two-field lymphadenectomy.

AIM: To analyze the pattern of recurrence of esophageal carcinoma after a curative-intention surgical resection. PATIENTS: Ninety-two patients with non-metastatic esophageal carcinoma were included. Ninety percent of patients were male, and the mean age of this series was 61 years. The most frequent histologic subtype was squamous cell carcinoma. Fifty percent of tumors were at or above the tracheal bifurcation. All patients were submitted for transthoracic subtotal esophagectomy plus two-field radical lymphadenectomy, leaving no apparent residual disease. No adjuvant therapy was applied to any patient. RESULTS: Follow-up was complete for 76 out of 80 patients surviving the operation. Thirty-four tumoral recurrences were detected for a disease-free survival af 39% at 9 years after surgery. All recurrences were detected during the first two years after treatment. Tumoral relapse was related to the presence of T3 or T4 tumors, with positive lymph nodes, squamous cell carcinoma subtype and supracarinal location. Nine percent of patients had a distant relapse, 15% had a locorregional relapse and 12% a combination of both. Distant relapse presented significantly earlier. There was no statistical association between type of recurrence and clinico-pathological or surgical features. CONCLUSIONS: After radical surgery for carcinoma of the esophagus, half of the patients relapse in the following two years. Distant metastases happen to appear earlier in the follow-up, but the most frequent recurrence is the locorregional one.

Protective effect of vagotomy on the gastric mucosa in a stress model in rats.

INTRODUCTION: The use of vagotomy is classically based on its inhibiting effects on acid secretion. Vagotomy induces both cellular and endocrine changes that may be involved in protective actions. Our aim was to study morphologic changes induced by vagotomy on the gastric mucosa and their relation to stress protection in the short, medium and long term. MATERIAL AND METHODS: An immobilization and cold stress model was used with 80 Wistar rats divided into two groups--control (with and without stress) and vagotomy (at 7, 30 and 120 days). Changes induced in the gastric mucosa by stress were studied with and without vagotomy, as well as relationship between these changes and the intended protective action. RESULTS: Bleeding showed a very significant relation to stress (p < 0.0001). Bleeding incidence exhibited a significant difference between vagotomised and non-vagotomised rats (p < 0.0001) in the short, medium and long term (vagotomy was protective against stress). Regeneration signs related significantly to vagotomy (p < 0.0001) but not stress (p = 0.208). However, no significant relationship was found between the protective action and the presence of regeneration signs (p = 1). CONCLUSIONS: Vagotomy has tropic effects on the gastric mucosa and is protective against stress. This protective action is maintained in the short, medium and long term. However, these changes are not sufficient to explain protection. An adaptation phenomenon mediated by hormonal and peptidic factors may be involved in this action.

[Bochdalek hernia in adults. Apropos of a case in the right side]. / Hernia de Bochdalek en el adulto. A propósito de un caso en el lado derecho.

Posterolateral diaphragmatic hernia (Bochdalek's hernia) is an infrequent finding in adult patients. Most of them are asymptomatic. Symptomatic cases present with digestive symptoms. Sometimes the clinical picture is related to the associated congenital malformations and not to the hernia itself. It is more common on the left side and in most of the cases it lacks of hernia sac. Simple radiologic study is the clue for the diagnosis. A case of Bochdalek's hernia in a 85 year-old patient is presented.

Serum and tissue CEA in colorectal cancer: clinical relevance.

PURPOSE: This article is an analysis of the information derived from the determination of tumor-tissue concentration of CEA in patients with colorectal cancer. To ascertain the relationship between tumor marker content with the histologic aspects and serologic levels of CEA of this neoplam. MATERIALS AND METHODS: 136 patients with colorectal adenocarcinoma and 41 with colorectal benign processes are analyzed and followed during an average time of 27 months. The CEA of the serum were obtained preoperatively and postoperatively and measured by radioimmunoassay (RIA). Tissular CEA levels were determined with RIA. The histological characteristics are analyzed (Dukes classification, grade of differentiation, index of atypia, microscopic vascular and lymphatic involvement. RESULTS: 1) The cut off point of the tissular CEA with the best sensitivity and specificity for the diagnosis of normal mucosa is 386 ng/mg and for tumoral tissue is 1160 ng/mg. 2) There is no correlation between tissue and serologic CEA value. 3) The tissular level of CEA have a significant statistical correlation with Dukes stage (p < 0.003); other histological characteristics were no significative. 4) There are significant statistical correlations between serologic CEA and relapse but no with survival rates. CONCLUSIONS: 1) Serologic CEA levels depend on numerous factors. 2) There aren't correlations between preoperative serologic levels and tissular CEA levels. 3) Tissular CEA do not predict what patients will have an elevated serologic CEA level in relapse.

Effect of pentoxifylline on the inhibition of surfactant synthesis induced by TNF-alpha in human type II pneumocytes.

Tumor necrosis factor alpha (TNF-alpha) seems to play an important role in the pathogenesis of the adult respiratory distress syndrome (ARDS). This study was designed to determine the effect of TNF-alpha and pentoxifylline (PTXF) on surfactant synthesis by isolated human type II pneumocytes. In order to isolate the pneumocytes, lungs obtained from both previously healthy multiple organ donors (n = 11) and patients who underwent surgical excision for lung cancer (n = 8) were used. Surfactant synthesis was measured by the incorporation of labeled glucose into the two most important phospholipid components of surfactant: phosphatidylcholine (PC) and phosphatidylglycerol (PGL). The pneumocytes of the donor group showed a greater degree of PC synthesis than those from the cancer group (3.44 +/- 0.19 versus 2.15 +/- 01.5 pmol/micrograms protein, p < 0.001). The synthesis of PC by pneumocytes in both the donor (1.13 +/- 0.19 versus 3.44 +/- 0.19 pmol/micrograms protein, p < 0.01) and cancer (0.99 +/- 0.11 versus 2.15 +/- 0.15 pmol/micrograms protein, p < 0.01) groups was decreased by TNF-alpha (100 ng/ml). This effect was blocked by PTXF (100 micrograms/ml), a substance that also increased PC production in the control-group pneumocytes from cancer patients, the final PC levels being similar to those of the donors in the absence of TNF-alpha. These results suggest that one of the mechanisms of TNF-alpha participation in the pathophysiology of ARDS is inhibition of surfactant synthesis, and support the hypothesis of in vivo production of TNF-alpha in lung-cancer patients, with subsequent chronic exposure of the lung epithelial cells to this cytokine.(ABSTRACT TRUNCATED AT 250 WORDS)

[Anal condylomata acuminata in children]. / Condilomas acuminados anales en niños.

Perianal condyloma acuminatum is a lesion rarely seen in children or babies. We report three new cases of this disease in children less than 3 years of age. There was no evidence of the mechanism of transmission in these cases. All patients underwent radical surgical excision. In one case, surgical treatment was needed on two different occasions due to the extension of the warts. None of the patients showed any recurrence of condyloma over a follow-up period of six years.

Acetaminophen-induced fulminant hepatic failure in dogs.

Results concerning morphological and biochemical changes following intravenous administration of different doses of acetaminophen in dogs are reported. Acetaminophen infusion, as a parenteral solution (500 mg per kg per 90 min), produced fulminant hepatitis characterized by a good correlation between Portmann's grade of lesion and percentage of necrosis. All animals died within 76 hr after intoxication. Analysis of biochemical parameters revealed positive correlation between serum bilirubin levels and severity of the hepatic lesion. The experimental model of acetaminophen-induced hepatotoxicity is proposed as a model for evaluation of the therapeutic efficacy of new medical and surgical procedures.