H Pârvănescu

Universitatea de Medicina si Farmacie Craiova, Croiova, Dolj, Romania

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Publications (13)8.22 Total impact

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    ABSTRACT: Skin burns represent a major problem of public health because of their frequency and because of their seriousness, too. The healing process of the burnt wound is extremely complex, as it requires a well-coordinated collaboration among different tissues and cellular strings. From the morphological point of view, the stages of the repairing process of the skin wounds include processes of inflammation, proliferation and tissular remodeling. Angiogenesis has a role of extreme importance within the healing process of third-degree skin burns. That is because the vascularization remake is necessary for feeding the tissue of granulation with nutritive substances and oxygen. The angiogenesis started relatively fast. Three days after the producing of the burn, there could be identified strings of CD34+ endothelial precursor cells at the edges and deep into the wound, all these having contact with the normal blood vessels or with those lees affected by the thermal aggression. After the lumenization of the newly-formed capillary vessels, there appeared the pericytes within their membrane. The CD34+ endothelial precursor cells (EPc), as well as the pericytes, participate at the synthesis of the base membrane of the angiogenesis vessels. The density of the angiogenesis vessels on the surface unit within the tissue of granulation grew from three to 12 days. After that, they reduced progressively while the tissue of granulation was becoming mature. The angiogenesis vessels go through a process of reshuffling and maturation at the same time with the maturation of the tissue of granulation, but these processes did not appear to be finished when the skin was completely healed, and the epidermis was totally recovered.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2013; 54(1):163-71. · 0.62 Impact Factor
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    ABSTRACT: Basal cell carcinoma (BCC) is one of the most common skin neoplasms in humans, accounting for almost 80% of all non-melanoma skin cancers worldwide. The nodular and infiltrative-morpheaform are the most common BCC types in the head and neck region and together with the micronodular subtypes are the most aggressive tumors, because of their tendency to infiltrate the deep subcutis, muscles and even bones. To explain the local aggressive behavior and their metastatic potential, many studies have been performed to identify the molecular determinants implicated in BCC tumor progression. For this reason, we investigated the immunohistochemical expression of CXCR4, MMP-13 and β-catenin expression in six metatypical, eight infiltrative-morpheaform, six micronodular and five superficial facial BCCs. For all three markers, the tumor reactivity varied with the histological type. The highest reactivity was observed in metatypical subtype, especially at the level of areas with squamous cells differentiation. The lowest reactivity was recorded in micronodular and superficial BCC subtypes. Regardless histological subtype, the tumor reactivity was higher at the advancing edge and additional a strong stromal reaction was noticed for all investigated markers peculiar in fibroblasts, inflammatory cells and endothelial cells. All these data proved the utility of CXCR4, MMP-13 and β-catenin immunohistochemical investigation in BCCs both for identification of high-aggressive tumors and to develop novel more efficient therapeutic strategy for these patients by targeting these biomarkers.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2013; 54(4):939-51. · 0.62 Impact Factor
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    ABSTRACT: Local cellular response plays a major role in restoring skin integrity, in burns with infectious complications, chronic fibrous sequelae, etc. For the study of wound-healing process, different experimental models of skin burn were developed. Mice, rats, rabbits and guinea pigs are the most used laboratory animals, kept under standard conditions of light, temperature, food and water (ad libitum). Commonly, by intramuscular injection, general anesthesia was induced with ketamine hydrochloride. Most times, skin burns were inflicted on the dorsal region of animals. Metal devices with different shapes and weights, heated in water at various temperatures were applied locally, for few seconds. The paper reports on 65 natural medicinal products recommended for the external and internal treatment of skin damages (first- or second-degree burns, various wounds, ulcerations). Some of them are traditionally used in the Romanian ethnopharmacology, supporting the wound-healing process mainly because of their epithelizing, astringent, emollient, demulcent, anti-inflammatory, antimicrobial, immunomodulatory and antioxidant properties.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2012; 53(2):249-62. · 0.62 Impact Factor
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    ABSTRACT: Skin burns are a rather high incidence lesions which, depending on their depth and extension, can severely affect not only the skin but the entire organism. Third-degree skin burns extended on over 20% of the body surface often require skin graft. Skin allograft is a therapeutic alternative when autograft cannot be used. We investigated the allograft influence on the angiogenesis process in third-degree skin burns, using an experimental model. We noticed that the allograft induces a stronger inflammatory reaction associated with intense angiogenesis process by about 10-15% compared to control group.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2012; 53(4):1061-7. · 0.62 Impact Factor
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    ABSTRACT: Macrophages are some of the innate immune cells with a central role in inflammatory and immune responses. Studies in the last 20 years have shown that these cells have a particular influence in the reparative processes also. Our aim in this study was to evaluate the macrophage response in third-degree skin burns treated with allograft in an experimental model. Macrophages were specifically highlighted by immunohistochemical staining with anti-CD68 antibody. In the first evolutive part of the reparatory process, macrophages rapidly increased both numerically and as a relative area with about 300%, and then decreased progressively along with the granulation tissue maturation. Macrophage overall response curve was similar in animals treated with allograft and in the control group (untreated), which leads us to believe that the allograft does not induce a more ample immune response that could be regarded as pathological.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2012; 53(4):1027-36. · 0.62 Impact Factor
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    ABSTRACT: Patients submitted to a trauma followed by a surgical intervention, experience pain and discomfort. Exogenous (surgical intervention, anesthesia) postoperative care, and endogenous factors, belonging to patient, especially neuro-psychological disturbances are synergic and participate together, to induce and to amplify the imbalance between oxidants/antioxidants, sustaining the appearance of oxidative injury, and worsening the wound healing. The morphological aspects are not correlated with the pain expression, but the discomfort and agitation have a great influence upon the bad evolution of organism and of wound healing.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2011; 52(1 Suppl):459-63. · 0.62 Impact Factor
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    ABSTRACT: Pericytes and myofibroblasts are two types of connective cells that appear in large quantities in reparative processes. In order to evaluate their response and any relationships between them, we have inflicted third degree skin burns to seven groups of five common Wistar rats each from which we sampled granulation tissue at three days interval for histological and immunohistochemical studies. Alpha-SMA and CD34 antibodies revealed that granulation tissue myofibroblasts do not express CD34 and do not arise from pericytes. The parallel arrangement of myofibroblasts in relation to the burned wound surface suggests that their main function is mechanical traction on granulation tissue and wound edges.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2011; 52(3 Suppl):1011-7. · 0.62 Impact Factor
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    ABSTRACT: Several years ago, researchers reported several complications produced after blood transfusions such as transfusion reactions, the transmission of a variety of infectious agents, etc. Recently, many authors appreciate that the stored blood transfusions (SBT) create an important damage for patients' life, because of oxygen metabolism disturbances, induced earlier, after three repeated transfusions and maintained longtime after. Our study proposed to note the consequences of SBT on wound healing, in burned patients, who were submitted to skin grafting and remained in hospital for a long period. We tried estimate the pathophysiological mechanisms implied in microcirculation's failure, microvascular systemic deficiency and death. RESULTS: Critically patients receiving SBT repeated frequently (six times/monthly for skin grafting) have an oscillatory outcomes depending by the reactivity of their biological terrain, as reflected by a several parameters we have measured. CONCLUSIONS: SBT administered as a restrictive transfusions to the patients with hemoglobin values <8 g% and hematocrit <35% has good effects on wound healing evolution.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2011; 52(2):599-604. · 0.62 Impact Factor
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    ABSTRACT: Endometriosis is a pathological feature induced by the presence and ectopic development of islets of endometrial active cells. The most common site of occurrence is the genital system, causing specific gynecological pathology. The extragenital localization of endometriosis is rare, but it is more severe and it may have a malignant local evolution, although its structures remain benign. The endometrial inclusions in the abdominal wall scar are iatrogenic "implants", created at the same time with the surgical operation, performed on patients with genital endometriosis. The only curable treatment of this topography of endometriosis is the surgical removal of all the pathological tissue, through a large excision. The hormonal therapy is adjuvant. Our study presents three cases treated in our clinic; the most important objective was to establish the etiological diagnosis and, subsequently, the large excision of the lesions.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2011; 52(1 Suppl):503-8. · 0.62 Impact Factor
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    ABSTRACT: Sinusoidal hemangioma is a rare variant of cavernous hemangioma that develops more frequently subcutaneous, often in the extremities. We report the case of a 19-year-old patient three times operated for a recurrent soft tissue tumor, located in the distal third of the antero-medial face of the right arm. Treatment was surgical and consisted of microsurgical excision of a tumor with dermal and intramuscular location. Histopathological analysis showed a nodular proliferation of interconnected thin-walled blood vessels, sinusoidal growth pattern and the presence of pseudopapillary structures. Immunohistochemical investigations were positive for CD31, CD34 and Ki67 index decreased, confirming the benign nature of vascular proliferation.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2011; 52(3):915-8. · 0.62 Impact Factor
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    ABSTRACT: Soft tissue leiomyosarcoma is a relatively rare malignant tumor. It may be difficult to be distinguished from gastrointestinal stromal tumors and Schwann cell neoplasms. To make a correct identification of soft tissue leiomyosarcoma, immunostaining with several smooth muscle differentiation markers (actin, calponin and desmin), and negative staining results with S100 (to rule out Schwann cell neoplasm), c-kit and CD34 (to rule out gastrointestinal stromal tumors) is needed. Prompt diagnosis and referral are desirable, since the size of the tumor at presentation is a continuous variable for the risk of local recurrence and metastatic disease. Chemosensitivity varies according to the tumor subtype, and the tumor grade, the patient's age, performance status, and the timing of metastatic disease further influence the likelihood of a response and survival. Chemotherapy is palliative for most patients with unresectable or metastatic disease. Ifosfamide and doxorubicin are routinely used in this setting; doxorubicin as a single agent is considered the drug of choice.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 01/2010; 51(2):379-85. · 0.62 Impact Factor
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    ABSTRACT: Soft tissue sarcomas are a rare group of cancers compromising 1% of all malignancies and there has been a slight increase in incidence. We present 3 cases of soft tissue sarcomas (the tumors were located to the right axilary region, perianal and dorsale face of the left leg) hospitalized in 2nd Surgical Clinic of Emergency Hospital of Craiova and we discuss the difficulties of diagnosis and treatment. The classification and characterization of soft-tissue sarcomas have evolved as the information supplied by histologic analysis has been supplemented with that provided by immunohistochemical analysis. Surgical resection involving wide margins, with or without radiotherapy, offers the best chance of cure in the absence of metastatic disease. There is little evidence that local recurrence increases the likelihood of metastatic spread, although debate on this point continues. Except for rhabdomyosarcomas and Ewing's sarcomas, the use of adjuvant chemotherapy generally does little to influence the natural history of the disease. In conclusion surgical treatment is mainstay of treatment for soft-tissue sarcomas and is usefull the prompt diagnosis for decrease the risk of local recurrence and metastatic disease.
    Chirurgia (Bucharest, Romania: 1990) 01/2010; 105(2):257-66. · 0.78 Impact Factor
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    ABSTRACT: Giant keratoacanthoma (KA) is a very rare tumor which benefits of surgical treatment. We present a case of 61-years-old man with a giant keratoacanthoma situated on the dorsum of the right hand. The diagnosis is established by routine histopathologic examination.
    Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 02/2005; 46(3):235-8. · 0.62 Impact Factor