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1.
Artigo em Inglês | MEDLINE | ID: mdl-38493959

RESUMO

OBJECTIVE: Peripheral regional anesthesia is proposed to enhance recovery. We sought to evaluate the efficacy of bilateral continuous erector spinae plane blocks (B-ESpB) for postoperative analgesia and the impact on recovery in children undergoing cardiac surgery. METHODS: Patients aged 2 through 17 years undergoing cardiac surgery in the enhanced recovery after cardiac surgery program were prospectively enrolled to receive B-ESpB at the end of the procedure, with continuous infusions via catheters postoperatively. Participants wore an activity monitor until discharge. B-ESpB patients were retrospectively matched with control patients in the enhanced recovery after cardiac surgery program. Outcomes of the matched clusters were compared using exact conditional logistic regression and generalized linear modeling. RESULTS: Forty patients receiving B-ESpB were matched to 78 controls. There were no major complications from the B-ESpB or infusions, and operating room time was longer by a median of 31 minutes. While blocks were infusing, patients with B-ESpB received fewer opioids in oral morphine equivalents than controls at 24 hours (0.60 ± 0.06 vs 0.78 ± 0.04 mg/kg; P = .02) and 48 hours (1.13 ± 0.08 vs 1.35 ± 0.06 mg/kg; P = .04), respectively. Both groups had low median pain scores per 12-hour period. There was no difference in early mobilization, length of stay, or complications. CONCLUSIONS: B-ESpBs are safe in children undergoing cardiac surgery. When performed as part of a multimodal pain strategy in an enhanced recovery after cardiac surgery program, pediatric patients with B-ESpB experience good pain control and require fewer opioids in the first 48 hours.

2.
J Prev Alzheimers Dis ; 11(2): 339-347, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38374740

RESUMO

BACKGROUND: Memory tests vary in their sensitivity for detection of pre-symptomatic Alzheimer's disease (AD). The Visual Short-Term Memory Binding Test (VSTMBT) identifies AD-related performance deficits in older adults who are otherwise cognitively unimpaired. OBJECTIVE: We investigated the association of this psychometric measure with brain amyloidosis and atrophy. DESIGN: Cross-sectional mixed and correlational. SETTING: Cognitive Reserve Study from Columbia University. PARTICIPANTS: a sample of 39 cognitively unimpaired older adults (Age: M=65.3, SD=3.07) was obtained from the above study. MEASUREMENTS: Extensive neuropsychological and neuroimaging (MRI and amyloid-ß PET) assessments were carried out. RESULTS: Performance on the VSTMBT allowed us to split the sample into Low Binding Cost (LBC, N=21) and High Binding Cost (HBC, N=18). Groups were matched according to age [p=0.702], years of education [0.071], and sex [p=0.291]. HBC's performance was comparable to that seen in symptomatic AD. Groups only differed in their amyloid-ß deposition on PET in regions of the right ventral stream linked to visual cognition and affected early in AD pathogenesis (lateral-occipital cortex, p = 0.008; fusiform gyrus, p = 0.017; and entorhinal cortex, p = 0.046). Other regions known to be linked to low-level visual integration function also revealed increased amyloid-ß deposition in HBC. CONCLUSIONS: VSTMB deficits are associated with neuropathogenesis (i.e., amyloid-ß deposition) in the earliest affected regions in pre-symptomatic AD. The VSTMB test holds potential for the identification of cognitively unimpaired older adults with very early AD pathogenesis and may thus be a useful tool for early intervention trials or other forms of clinical research.


Assuntos
Doença de Alzheimer , Peptídeos beta-Amiloides , Idoso , Humanos , Lactente , Doença de Alzheimer/diagnóstico , Peptídeos beta-Amiloides/metabolismo , Encéfalo/metabolismo , Estudos Transversais , Tomografia por Emissão de Pósitrons , Memória/fisiologia
4.
Front Neurosci ; 17: 1305921, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-38075269

RESUMO

Astrocytes are a vital cellular component of the central nervous system that impact neuronal function in both healthy and pathological states. This includes intercellular signals to neurons and non-neuronal cells during development, maturation, and aging that can modulate neural network formation, plasticity, and maintenance. Recently, human pluripotent stem cell-derived neural aggregate cultures, known as neurospheres or organoids, have emerged as improved experimental platforms for basic and pre-clinical neuroscience compared to traditional approaches. Here, we summarize the potential capability of using organoids to further understand the mechanistic role of astrocytes upon neural networks, including the production of extracellular matrix components and reactive signaling cues. Additionally, we discuss the application of organoid models to investigate the astrocyte-dependent aspects of neuropathological diseases and to test astrocyte-inspired technologies. We examine the shortcomings of organoid-based experimental platforms and plausible improvements made possible by cutting-edge neuroengineering technologies. These advancements are expected to enable the development of improved diagnostic strategies and high-throughput translational applications regarding neuroregeneration.

5.
Med Oral Patol Oral Cir Bucal ; 28(3): e217-e228, 2023 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-37026607

RESUMO

BACKGROUND:  Oral decay prior to a hospital medical-surgical procedure is a risk factor for the development of postoperative complications. However, perioperative oral practices as a protective factor have not been studied. This review aims to evaluate the effectiveness of perioperative oral practices in the reduction of risk of developing postoperative complications in in-hospital medical surgical procedures. MATERIAL AND METHODS: This review and meta-analysis was conducted according to Cochrane guidelines. Medline, Scopus, Scielo, and Cochrane were consulted. Articles of the previous 10 years concerning adult patients undergoing perioperative oral practices prior to hospital medical-surgical procedures, were included. Data of the type of perioperative oral practice, type of postoperative complication and measures of effect on the development of complications were extracted. RESULTS: Of a pool of 1470 articles, 13 were included for systematic review and 10 for meta-analysis. The most common perioperative oral procedures were focalized approach (FA), referred to only the elimination of infectious foci in the oral cavity and comprehensive approach (CA), referred to a integral approach of the patient's oral health, both of which were mainly performed in oncologic surgeries, both were effective in the reduction of postoperative complications (RR=0.48, [95% CI 0.36 - 0.63]). The most reported postoperative complication was postoperative pneumonia. CONCLUSIONS: Perioperative oral management proved to be a protective factor against the development of postoperative complications.


Assuntos
Hospitais , Complicações Pós-Operatórias , Adulto , Humanos , Incidência , Tempo de Internação , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/prevenção & controle
6.
Neurologia (Engl Ed) ; 2023 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-37120110

RESUMO

INTRODUCTION AND OBJECTIVE: Headache is a frequent reason for consultation between primary care physicians, emergency services physicians, and neurology specialists; however, it is not always well managed. The Andalusian Society of Neurology's Headache Study Group (SANCE) aimed to analyse headache management at different levels of care. MATERIAL AND METHODS: We conducted a descriptive cross-sectional study with data gathered through a retrospective survey in July 2019. Participants completed a series of structured questionnaires on different social and work-related variables from 4 different groups of healthcare professionals (primary care [PC], emergency departments, neurology departments, headache units). RESULTS: A total of 204 healthcare professionals completed the survey: 35 emergency department physicians, 113 PC physicians, 37 general neurologists, and 19 neurologists specialising in headache. Eighty-five percent of PC physicians reported prescribing preventive drugs, which were maintained for at least 6 months (59%), with flunarizine and amitriptyline being the most commonly used. Most patients attended at neurology consultations (65%) are referred by PC physicians, with changes in the headache pattern being the main reason for referral (74%). Healthcare professionals across all levels of care showed great interest in headache and in receiving training in headache management (97% of PC physicians, 100% of emergency services physicians, 100% of general neurologists). CONCLUSIONS: Migraine sparks great interest among healthcare professionals from different levels of care. Our results also reveal a lack of resources for headache management, which is reflected in the long waiting times. Other means of bilateral communication between different levels of care should be explored (eg, e-mail).

7.
Artigo em Inglês | MEDLINE | ID: mdl-36786331

RESUMO

Summary: Sublingual immunotherapy with Pru p3 extract (SLIT-peach®) is used in allergy patients to multiple plant foods to induce tolerance to nonspecific lipid transfer proteins (nsLTP). The aim of this paper is to communicate the efficacy of a new ultrafast regimen. Until now on the initiation regimen lasts four days. We present a number of 22 patients with LTP-syndrome due to ingestion of different vegetable foods sensitized to Pru p3. According to European Academy of Allergy position paper (1) food immunotherapy is indicated when avoidance measures are ineffective, undesirable, or cause serious limitations on patients quality of life. Our patients had an impact on their quality of life (score > 130) before SLIT measured with (2) EuroPrevall Food Allergy Quality of Life Questionnaire (FAQLQ). The ultrafast regimen in one day is achieved in the 95% of our patients. Mild adverse reactions where observed, such as oral pruritus presence in almost all patients. Only one patient (5%) achieved the maintenance dose in two days due to intense oral pruritus. No patients presented systemic reactions. The maintenance dose achieved consists of 4 drops (0,16 ml) from vial number 4 daily. The concentration of Pru p3 in vial nº4 is 50 cg/ml. Four drops a day equals 8 micrograms of Pru p3. This new ultrafast regimen in one day is secure in patients with LTP-Syndrome to induce tolerance to SLIT-peach® (Pru p3 extract).

9.
Artigo em Inglês | MEDLINE | ID: mdl-36637172

RESUMO

Summary: Introduction. Food allergy is an increasing problem for population and treatments inducing tolerance using sublingual immunotherapy is currently under study. Case presentation. Our aim as allergists is to achieve tolerance to sublingual allergen specific immunotherapy with sublingual immunotherapy (SLIT-peach). We present a case report consisting of a 40 year old woman with anaphylactic reactions after eating fruit and other plant-foods due to sensitization to nonspecific lipid transfer proteins (nsLTP). Her diagnose, LTP-syndrome. This protein is the main panallergen in our area and causes crossed reaction to multiple plant foods. The principal allergen in this syndrome is rPru p3, present in peach and most vegetables, fruits, nuts and grains. Serum specific IgE levels were performed using microarrays and positive for seven nsLTPs: rAra h9, rCor a8, nJug r3, rPru p3, rTri a 14, nArt v3 and rPla a3. Immediate reaction to SLIT in the fourth month of maintenance-dose led us to interrupt pru p3 immunotherapy. Immediate reaction to Omalizumab in the fourth dose in Hospital consisting in anaphylaxis prompted us to switch to Dupilumab. After four months with this monoclonal antibody we reintroduced sublingual immunotherapy with pru p3 SLIT-peach® achieving maintenance dose of four drops a day with no clinical reactions. SLIT-peach® in our patient is crucial for her due to her restricted diet, the severity of reactions and lack of quality of life measured by Europevall questionnaire. Conclusions in our case our aim is to achieve SLIT. We report a case of compassionate use with Dupilumab in a patient with multiple food allergy syndrome mediated by nsLTP. There are no cases reported for Dupilumab in this use.

10.
Eye (Lond) ; 37(2): 203-219, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-35428871

RESUMO

The retina and the optic nerve are considered extensions of the central nervous system (CNS) and thus can serve as the window for evaluation of CNS disorders. Spectral domain optical coherence tomography (OCT) allows for detailed evaluation of the retina and the optic nerve. OCT can non-invasively document changes in single retina layer thickness and structure due to neuronal and retinal glial cells (RGC) modifications in systemic and local inflammatory and neurodegenerative diseases. These can include evaluation of retinal nerve fibre layer and ganglion cell complex, hyper-reflective retinal spots (HRS, sign of activated microglial cells in the retina), subfoveal neuroretinal detachment, disorganization of the inner retinal layers (DRIL), thickness and integrity of the outer retinal layers and choroidal thickness. This review paper will report the most recent data on the use of OCT as a non invasive imaging biomarker for evaluation of the most common systemic neuroinflammatory and neurodegenerative/neurocognitive disorders in the adults and in paediatric population. In the adult population the main focus will be on diabetes mellitus, multiple sclerosis, optic neuromyelitis, neuromyelitis optica spectrum disorders, longitudinal extensive transverse myelitis, Alzheimer and Parkinson diseases, Amyotrophic lateral sclerosis, Huntington's disease and schizophrenia. In the paediatric population, demyelinating diseases, lysosomal storage diseases, Nieman Pick type C disease, hypoxic ischaemic encephalopathy, human immunodeficiency virus, leukodystrophies spinocerebellar ataxia will be addressed.


Assuntos
Neuromielite Óptica , Tomografia de Coerência Óptica , Adulto , Humanos , Criança , Tomografia de Coerência Óptica/métodos , Células Ganglionares da Retina , Doenças Neuroinflamatórias , Retina/diagnóstico por imagem , Neuromielite Óptica/diagnóstico , Biomarcadores
11.
Cardiol Young ; 33(2): 260-265, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35322768

RESUMO

BACKGROUND: Post-operative nausea and vomiting is frequent after congenital cardiac surgery. AIMS: We sought to determine factors associated to severe post-operative vomiting after congenital cardiac surgery and the effect on post-operative outcomes. METHODS: Patients > 30 days of age who underwent elective cardiac surgical repair as part of an enhanced recovery after congenital cardiac surgery programme were retrospectively reviewed. Patient characteristics and perioperative factors were compared by univariate analysis for patients with severe post-operative vomiting, defined as three events or more, and for patients with no-or-mild post-operative vomiting. All variables with a p-value < 0.1 were included in a multivariable model, and major post-operative outcomes were compared using regression analysis. RESULTS: From 1 October, 2018 to 30 September, 2019, 430 consecutive patients were included. The median age was 4.8 years (interquartile range 1.2-12.6). Twenty-one per cent of patients (91/430) experienced severe post-operative vomiting. Total intraoperative opioids > 5.0 mg/kg of oral morphine equivalent (adjusted odds ratio 1.72) and post-operative inotropes infusion(s) (adjusted odds ratio 1.64) were identified as independent predictors of severe post-operative vomiting after surgery. Patients suffering from severe post-operative vomiting had increased pulmonary complications (adjusted odds ratio 5.18) and longer post-operative hospitalisation (adjusted coefficient, 0.89). CONCLUSIONS: Greater cumulative intraoperative opioids are associated with severe post-operative vomiting after congenital cardiac surgery. Multimodal pain strategies targeting the reduction of intraoperative opioids should be considered during congenital cardiac surgery to enhance recovery after surgery.


Assuntos
Procedimentos Cirúrgicos Cardíacos , Náusea e Vômito Pós-Operatórios , Humanos , Pré-Escolar , Estudos Retrospectivos , Náusea e Vômito Pós-Operatórios/epidemiologia , Náusea e Vômito Pós-Operatórios/etiologia , Dor , Procedimentos Cirúrgicos Cardíacos/efeitos adversos , Dor Pós-Operatória
13.
Ophthalmic Surg Lasers Imaging Retina ; 53(11): 639-643, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36378611

RESUMO

Wagner disease is a rare, nonsyndromic vitreoretinopathy caused by autosomal dominant variants in the versican (VCAN) gene. It is associated with abnormalities of the vitreoretinal interface that can lead to peripheral traction and retinal detachments, which also occur in other vitreoretinopathies such as X-linked retinoschisis (XLRS), familial exudative vitreoretinopathy (FEVR) and Stickler syndrome. There is variability in the clinical phenotype in Wagner disease potentially due to variants in VCAN gene variants. In this article, we report a family harboring the VCAN c.9265+1G>C variant and describe the clinical and retinal findings in two members. [Ophthalmic Surg Lasers Imaging Retina 2022;53:639-643.].


Assuntos
Degeneração Retiniana , Descolamento Retiniano , Doenças Retinianas , Humanos , Versicanas , Retina , Descolamento Retiniano/diagnóstico , Linhagem , Mutação
14.
Ophthalmic Surg Lasers Imaging Retina ; 53(10): 570-573, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36239674

RESUMO

Juxtapapillary retinal capillary hemangiomas are sight-threatening hamartomas located on or adjacent to the optic nerve. Nonsurgical approaches including laser photocoagulation and cryotherapy have been shown to be effective to reduce exudation in peripheral hemangiomas. However, in juxtapapillary hemangiomas, the functional outcomes are limited due to associated potential damage of the retinal nerve fiber layer. We present an 18-year-old female patient with von Hippel-Lindau (VHL) disease who presented with a juxtapapillary retinal capillary hemangioma associated with a tractional epiretinal membrane (ERM) and secondary macular hole. After vitrectomy-assisted excision of the lesion and inner limiting membrane (ILM) peeling around the macular hole, visual acuity and macular anatomy were recovered at 10 months of follow-up. [Ophthalmic Surg Lasers Imaging Retina 2022;53:570-573.].


Assuntos
Membrana Epirretiniana , Hemangioblastoma , Hemangioma Capilar , Neoplasias da Retina , Perfurações Retinianas , Doença de von Hippel-Lindau , Adolescente , Membrana Epirretiniana/complicações , Membrana Epirretiniana/diagnóstico , Membrana Epirretiniana/cirurgia , Feminino , Hemangioblastoma/complicações , Hemangioma Capilar/diagnóstico , Hemangioma Capilar/cirurgia , Humanos , Neoplasias da Retina/complicações , Neoplasias da Retina/diagnóstico , Neoplasias da Retina/cirurgia , Perfurações Retinianas/cirurgia , Vitrectomia , Doença de von Hippel-Lindau/complicações
15.
Nat Cell Biol ; 24(9): 1350-1363, 2022 09.
Artigo em Inglês | MEDLINE | ID: mdl-36075976

RESUMO

Coordinated changes of cellular plasticity and identity are critical for pluripotent reprogramming and oncogenic transformation. However, the sequences of events that orchestrate these intermingled modifications have never been comparatively dissected. Here, we deconvolute the cellular trajectories of reprogramming (via Oct4/Sox2/Klf4/c-Myc) and transformation (via Ras/c-Myc) at the single-cell resolution and reveal how the two processes intersect before they bifurcate. This approach led us to identify the transcription factor Bcl11b as a broad-range regulator of cell fate changes, as well as a pertinent marker to capture early cellular intermediates that emerge simultaneously during reprogramming and transformation. Multiomics characterization of these intermediates unveiled a c-Myc/Atoh8/Sfrp1 regulatory axis that constrains reprogramming, transformation and transdifferentiation. Mechanistically, we found that Atoh8 restrains cellular plasticity, independent of cellular identity, by binding a specific enhancer network. This study provides insights into the partitioned control of cellular plasticity and identity for both regenerative and cancer biology.


Assuntos
Reprogramação Celular , Células-Tronco Pluripotentes Induzidas , Plasticidade Celular/genética , Reprogramação Celular/genética , Células-Tronco Pluripotentes Induzidas/metabolismo , Fator 3 de Transcrição de Octâmero/genética , Fatores de Transcrição SOXB1/genética , Fatores de Transcrição/metabolismo , Proteínas Supressoras de Tumor/metabolismo
16.
Arch Soc Esp Oftalmol (Engl Ed) ; 97(4): 219-223, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35523468

RESUMO

Full-thickness macular hole is a rare complication of macular telangiectasia type 2, and its treatment is still controversial. A patient with a full-thickness macular hole secondary to macular telangiectasia type 2 underwent vitreoretinal surgery with a plasma rich in growth factors membrane in the macular hole. At the sixth month of follow-up, anatomical and functional improvements were achieved, with no adverse effects. Plasma rich in growth factors is a new option, with advantages due to its biological properties that achieves good results in terms of safety and effectiveness in the surgical treatment of macular hole.


Assuntos
Perfurações Retinianas , Telangiectasia Retiniana , Humanos , Perfurações Retinianas/etiologia , Perfurações Retinianas/cirurgia , Telangiectasia Retiniana/complicações , Telangiectasia Retiniana/terapia , Vitrectomia/métodos
17.
J Cardiothorac Vasc Anesth ; 36(9): 3603-3609, 2022 09.
Artigo em Inglês | MEDLINE | ID: mdl-35577651

RESUMO

OBJECTIVES: Disparities in perioperative outcomes exist. In addition to patient and socioeconomic factors, racial disparities in outcome measures may be related to issues at the provider and institutional levels. Recognizing a potential role of standardized care in mitigating provider bias, this study aims to compare the perioperative sedation and pain management and consequent outcomes in Enhanced Recovery After Surgery (ERAS) cardiac patients of different races undergoing congenital heart surgery at a single quaternary children's hospital. DESIGN: A retrospective study. SETTING: A single quaternary pediatric hospital. PARTICIPANTS: Patients, infants to adults, undergoing elective congenital cardiac surgery and enrolled in the ERAS protocol from October 2018 to December 2020. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Of the patients, 872 were reviewed and 606 with race information were analyzed. There was no significant difference in intraoperative and postoperative oral morphine equivalent, perioperative sedatives, and regional blockade in Asian or African American patients when compared to White patients. Postoperative pain scores and outcomes among African American and Asian races were also not statistically different when compared to White patients. CONCLUSIONS: Racial disparity in perioperative management and outcomes in patients with standardized ERAS protocols does not exist at the authors' institution. Future comparative studies of ERAS noncardiac patients may provide additional information on the role of standardization in reducing implicit bias.


Assuntos
Recuperação Pós-Cirúrgica Melhorada , Cardiopatias Congênitas , Adulto , Criança , Cardiopatias Congênitas/cirurgia , Humanos , Lactente , Tempo de Internação , Dor Pós-Operatória , Complicações Pós-Operatórias , Estudos Retrospectivos
18.
Arch. Soc. Esp. Oftalmol ; 97(4): 219-223, abr. 2022. ilus
Artigo em Espanhol | IBECS | ID: ibc-208842

RESUMO

El agujero macular de espesor total es una complicación rara de la telangiectasia macular tipo 2, y su tratamiento es aún controvertido. Una paciente con esta entidad fue llevada a cirugía vitreorretiniana con aplicación de membrana de plasma rico en factores de crecimiento sobre el agujero macular. Al sexto mes de cirugía se logró mejoría anatómica y funcional, sin efectos adversos asociados. El plasma rico en factores de crecimiento es una alternativa nueva en el tratamiento quirúrgico del agujero macular atípico y/o persistente, que logra buenos resultados en términos de seguridad efectividad, debido a sus propiedades biológicas (AU)


Full-thickness macular hole is a rare complication of macular telangiectasia type 2, and its treatment is still controversial. A patient with a full-thickness macular hole secondary to macular telangiectasia type 2 underwent vitreoretinal surgery with a plasma rich in growth factors membrane in the macular hole. At the sixth month of follow-up, anatomical and functional improvements were achieved, with no adverse effects. Plasma rich in growth factors is a new option, with advantages due to its biological properties that achieves good results in terms of safety and effectiveness in the surgical treatment of macular holey (AU)


Assuntos
Humanos , Feminino , Idoso , Perfurações Retinianas/etiologia , Perfurações Retinianas/cirurgia , Telangiectasia Retiniana/complicações , Cirurgia Vitreorretiniana/métodos , Fatores de Crescimento Transformadores/administração & dosagem , Plasma , Resultado do Tratamento
19.
Am J Ophthalmol Case Rep ; 25: 101395, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35198819

RESUMO

PURPOSE: To report a case of preretinal hemorrhage from extraretinal neovascularization related to capillary non-perfused retina within a large schisis in a pediatric patient with X-linked retinoschisis (XLRS). OBSERVATIONS: A 4-year old male with an RS1 mutation and XLRS presented with preretinal and vitreous hemorrhage in the right eye. Retinal imaging, including wide angle fluorescein angiography (FA) and optical coherence tomography (OCT), showed vitreoretinal traction on extraretinal neovascularization and capillary non-perfused retina in the schisis cavity. Laser treatment to the non-perfused retina within the schisis was successful in reducing extraretinal neovascularization. CONCLUSIONS: Vitreous hemorrhage is a well-known occurrence in XLRS. Imaging using wide angle FA and OCT were helpful to determine the causes of hemorrhage in order to develop a management plan.

20.
Med Oral Patol Oral Cir Bucal ; 27(2): e174-e180, 2022 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-35218646

RESUMO

BACKGROUND: The aim of the present study was to evaluate the effect of different concentrations of growth hormone (GH) on endosteal implant's surface at the early stages of osseointegration. MATERIAL AND METHODS: Sixty tapered acid-etched titanium implants were divided into four groups: i) Collagen, used as a control group; and three experimental groups, where after collagen coating, GH was administered directly to the surface in varying concentrations: ii) 0.265 mg, iii) 0.53 mg, and iv) 1 mg. Implants were placed in an interpolated fashion in the anterior flange of C3, C4 or C5 of 15 sheep with minimum distance of 6 mm between implants. After 3-, 6- and 12-weeks of healing samples were harvested, histologically processed, qualitatively and quantitatively assessed for bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO). RESULTS: Statistical analysis as a function of time in vivo and coating resulted in no significant differences for BIC and BAFO at any evaluation time point. Histological evaluation demonstrated similar osseointegration features for all groups with woven bone formation at 3 weeks and progressive replacement of woven for lamellar bone in close contact with the implant surface and within the implant's threads. CONCLUSIONS: A single local application of growth hormone to the surface of titanium implants did not yield improved implant osseointegration independent of healing time.


Assuntos
Implantes Dentários , Osseointegração , Animais , Hormônio do Crescimento/farmacologia , Ovinos , Propriedades de Superfície , Titânio/farmacologia
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