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Results for “Gelatin Sponge, Absorbable”

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PubMed2001

Cutting edge: restoration of the ability to generate CTL in mice immune to adenovirus by delivery of virus in a collagen-based matrix.

Viruses are commonly used for the delivery of genes coding for tumor-associated Ags to elicit tumor-specific immune responses. The success of viral vectors has been limited in preclinical and clinical trials in part because of antiviral immunity. We investigated the ability of a collagen-based matrix (Gelfoam; Pharmacia and Upjohn, Kalamazoo, MI) to improve CTL activation by recombinant adenovirus. The data show that coinjection of Gelfoam with type 5 adenovirus recombinant for prostate-specific Ag (Ad5-PSA) enhanced CTL activation. Ad5-PSA priming in Gelfoam also abrogated the inhibitory effects of adenoviral immunity on CTL activation in mice naive to PSA but immune to adenovirus. Finally, Gelfoam enhanced immunization in a self-Ag model using type 5 adenovirus recombinant for membrane-bound OVA (Ad5-mOVA) in rat insulin promoter (RIP)-mOVA-transgenic mice. Thus, Gelfoam enhances CTL activation by recombinant viral vectors in a setting where preformed Ab to the virus is present and also in a tolerant self-Ag model.

Adenoviruses, Human↗
PubMed2004

Textiloma (gossypiboma) mimicking recurrent intracranial tumor.

CONTEXT: Resorbable substances used to achieve hemostasis during neurosurgical procedures comprise 3 principal classes based on chemical composition: (1) gelatin sponge, (2) oxidized cellulose, and (3) microfibrillar collagen. Nonresorbable hemostatic aides include various forms of cotton and rayon-based hemostats (cottonoids and kites). Resorbable and nonresorbable hemostatic agents have been reported to cause symptomatic mass lesions, most commonly following intra-abdominal surgery. Histologic examination typically shows a core of degenerating hemostatic agent surrounded by an inflammatory reaction. Each agent exhibits distinctive morphologic features that often permit specific identification. Hemostat-associated mass lesions have been variously referred to as textilomas, gossypibomas, gauzomas, or muslinomas. OBJECTIVES: The aims of this study were to (1) identify cases of histologically proven cases of textiloma in neurosurgical operations, (2) characterize the specific hemostatic agent associated with textiloma formation, and (3) characterize the preoperative magnetic resonance imaging appearance of textiloma. DESIGN: Cases in which a textiloma constituted the sole finding on repeat surgery for recurrent brain tumor, or was a clinically significant component of a radiologically identified mass lesion together with residual tumor, constituted the study set. RESULTS: Five textilomas were identified and evaluated. The primary neoplasm was different in each case and included pituitary adenoma, tanycytic ependymoma, anaplastic astrocytoma, gliosarcoma, and oligodendroglioma. In all cases, preoperative magnetic resonance imaging suggested recurrent tumor. Textilomas included all categories of resorbable hemostatic agent. Other foreign bodies were present in some cases; the origin of these foreign bodies was traced to fibers shed from nonresorbable hemostatic material placed temporarily during surgery and removed before closure (cottonoids and kites). Inflammatory reactions included giant cells, granulomas, and fibroblastic proliferation. Microfibrillar collagen (Avitene) textilomas were associated with a striking eosinophil infiltration that was not seen with any other hemostatic agent. CONCLUSIONS: Hemostatic agents may produce clinically symptomatic, radiologically apparent mass lesions. When considering a mass lesion arising after intracranial surgery, the differential diagnosis should include textiloma along with recurrent tumor and radiation necrosis.

Adolescent↗
PubMed2002

[Long-term result of the transcatheter arterial embolization for ruptured renal angiomyolipoma].

PURPOSE: The long-term results were studied in patients who underwent transcatheter arterial embolization (TAE) for the spontaneous rupture of renal angiomyolipoma (AML). MATERIAL AND METHODS: Five cases (1 male, 4 females) who underwent TAE for spontaneous AML rupture between November, 1996 and February 2000 were studied. Spontaneous rupture of AML was diagnosed with CT. TAE were carried out by injection of ethanol and lipiodol and application of either a metal coil or gelform. RESULT: In 4 cases, after performing TAE only one time, the tumor size was reduced and there has been no re-rupture or re-bleeding during the ongoing follow-up. In the other case, an enucleation operation was carried out 11 days after TAE in accordance with the patient's request. DISCUSSION: Recently, there have been a few reports on the long-term effectiveness of TAE, a conservative treatment for renal AML rupture. Our study indicated that TAE might be recommended for patients with renal AML rupture not only for stanching and pre-operative treatment but also for a conservative treatment with regular follow-up.

Adult↗
PubMed1999

Role of the C-C chemokine, TCA3, in the protective anticryptococcal cell-mediated immune response.

Activated T lymphocytes play a crucial role in orchestrating cellular infiltration during a cell-mediated immune (CMI) reaction. TCA3, a C-C chemokine, is produced by Ag-activated T cells and is chemotactic for neutrophils and macrophages, two cell types in a murine CMI reaction. Using a gelatin sponge model for delayed-type hypersensitivity (DTH), we show that TCA3 is a component of the expression phase of an anticryptococcal CMI response in mice. TCA3 mRNA levels are augmented in anticryptococcal DTH reactions at the same time peak influxes of neutrophils and lymphocytes are observed. Neutralization of TCA3 in immunized mice results in reduced numbers of neutrophils and lymphocytes at DTH reaction sites. However, when rTCA3 is injected into sponges in naive mice, only neutrophils are attracted into the sponges, indicating TCA3 is chemotactic for neutrophils, but not lymphocytes. We show that TCA3 is indirectly attracting lymphocytes into DTH-reactive sponges by affecting at least one other chemokine that is chemotactic for lymphocytes. Of the two lymphocyte-attracting chemokines assessed, monocyte-chemotactic protein-1 and macrophage-inflammatory protein-1alpha (MIP-1alpha), only MIP-1alpha was reduced when TCA3 was neutralized, indicating that TCA3 affects the levels of MIP-1alpha, which attracts lymphocytes into the sponges. TCA3 also plays a role in protection against Cryptococcus neoformans in the lungs and brains of infected mice, as evidenced by the fact that neutralization of TCA3 results in increased C. neoformans CFU in those two organs.

Animals↗
PubMed1999

Hypervascular spinal tumors: influence of the embolization technique on perioperative hemorrhage.

BACKGROUND AND PURPOSE: Corporectomy is an effective treatment for vertebral metastases; however, massive perioperative hemorrhage is often associated with this procedure. We compared preoperative particle, particle-coil, and coil embolizations of hypervascular spinal tumors prior to vertebral body replacement to determine which prevented perioperative hemorrhage most effectively. METHODS: The vertebral tumors of 59 patients were embolized prior to corporectomy. In 26 cases, only coils were used for the proximal occlusion of feeding segmental arteries. Twenty-four patients received a combination of polyvinyl alcohol (PVA) particles and coils, and nine tumors were embolized with particles alone. We compared intraoperative blood loss between the three groups and 10 other patients who did not undergo embolization prior to corporectomy. RESULTS: Estimation of intraoperative hemorrhage showed a median value of 4350 mL in patients without embolization, 2650 mL in cases of coil embolization, 1850 mL in cases of particle-coil embolization, and 1800 mL in cases of particle embolization. The difference between unembolized patients and those who underwent coil embolization was not statistically significant. Particle and particle-coil embolizations showed very similar results, and reduced hemorrhage significantly as compared to unembolized and proximal coil occlusion cases. Residual bleeding came from the venous system and the neighborhood of the embolized region. CONCLUSION: Particle embolization prior to corporectomy can reduce perioperative hemorrhage. The additional benefit of proximal coil occlusion of arterial feeders is questionable.

Adolescent↗
PubMed1997

[Splenic artery embolization for the treatment of traumatic splenic rupture].

We used splenic artery gelfoam embolization to save the spleen Seldinger's method in 20 patients with traumatic rupture of the spleen. All patients had the spleen reserved by single embolizing hemostasis satisfactorily. We delineate the method, clinical value, indication and experience of embolism-hemostasis in detail.

Adult↗
PubMed1999

Transhepatic artery chemoembolization for liver metastases of primary retroperitoneal endodermal sinus tumor. A case report.

BACKGROUND: Primary retroperitoneal endodermal sinus tumors (EST) are extremely rare and highly malignant. Hepatic metastases from EST are often very difficult to manage and carry a dismal prognosis. Transhepatic artery chemoembolization has been widely applied in primary unresectable hepatoma and had been reported to have antitumor activity for some metastatic tumors. We report a case in which transhepatic artery chemo-embolization was employed to control hepatic metastases from EST. CASE: A 35-year-old woman presented to our service with primary retroperitoneal EST associated with multiple hepatic metastases. The patient underwent aggressive debulking surgery followed by a combination chemotherapy regimen of cisplatin, vinblastine and bleomycin. Transhepatic artery chemoembolization with adriamycin, lipoidol and gelfoam was subsequently employed to treat hepatic metastases. CONCLUSION: The combination of transhepatic artery chemoembolization and systemic chemotherapy after surgical resection of primary retroperitoneal EST was effective in controlling the hepatic disease in this case.

Adult↗
PubMed1998

[An experimental study of prevention of peridural adhesion following laminectomy].

In order to find an ideal biological material to prevent peridural adhesion following laminectomy, 30 rabbits were used as animal model, in each of which 2 defects with a size of 1 cm x 0.5 cm were made following laminectomy of L3, L5 spine. One of the defects was covered extradurally with chitosan, gelatin foam or PLA membrane respectively, while the other defect was exposed as control. All of these animals were sacrificed on the 2nd, 4th, 6th, 8th and 10th week after operation, and the extradural fibrosis and adhesion of every animal were evaluated by gross observation and histological examinations. It was revealed that in the chitosan and PLA membrane groups, the extradural tissue was smooth without thickening and there was no fibrous proliferation or adhesion in the epidural cavity, and that in the chitosan group, the growth of fibroblast was restrained but the growth of the epithelial cells was promoted significantly, thus, wound healing was rapid. In the control group and gelatin foam group, obvious extradural fibrosis and adhesion were observed and the extradural space had almost disappeared. Therefore, it was concluded that the biodegradable PLA membrane and chitosan were both an ideal material in the prevention of postoperative epidural adhesion.

Animals↗
PubMed1999

[Arterial lipiodol chemoembolization of a left liver metastasis through the right internal thoracic artery].

The purpose of this article is to illustrate the efficacy of the chemoembolization in patients with hypervascular metastases and to describe the post-embolization change in vascularization pattern. Unusual collaterals may develop following embolization. A 59-year-old woman, followed for unresectable small bowel carcinoid tumor since 1991, underwent successful chemoembolization of several liver metastases. Only one liver lesion, located in segment IV, showed interval increase in size. This lesion was supplied by the right internal mammary artery. A branch of the right internal mammary artery was catheterized using a microcatheter and embolization was performed using doxorubicine-Lipiodol (Adriblastine, Lipiodol) and gelfoam (Spongel). No complications occurred after the procedure. The right internal mammary artery should be considered as a possible source of collateral arterial supply to the liver and should be evaluated in patients with local progression of disease.

Antibiotics, Antineoplastic↗