Topical glyceryl trinitrate to increase radial artery diameter in neonates: study protocol for a randomized controlled trial.

BACKGROUND: Newborn infants admitted to the neonatal intensive care unit require arterial cannulation for hemodynamic monitoring and blood sampling. Arterial access is achieved through catheterization of umbilical or peripheral arteries. Peripheral artery cannulation is performed in critically ill newborns, but artery localization and cannulation is often challenging and unsuccessful. Therefore, increasing the internal diameter and preventing vasospasm are important for successful peripheral artery cannulation in neonates. Topical glyceryl trinitrate has the potential to increase cannulation success by relaxing arterial smooth muscles and thus increasing the internal diameter. We aim to conduct a pilot randomized controlled trial to evaluate the efficacy and safety of topycal glyceryl trinitrate in increasing the diameter of the radial artery in neonates. METHODS/DESIGN: This study will be a single-center, observer-blind, randomized, placebo-controlled trial conducted in the neonatal intensive care unit of Perth Children's Hospital, Western Australia. A total of 60 infants born at >34 weeks of gestation who are admitted for elective surgery or medical reasons and for whom a peripheral arterial line is needed for sampling or blood pressure monitoring will be recruited after informed parental consent is obtained. The primary outcome will be the change in radial arterial diameter from baseline to postintervention. Secondary outcomes will be the absolute and percentage change from baseline in the radial arterial diameter in both limbs and safety (hypotension and methemoglobinemia). DISCUSSION: This will be the first randomized controlled trial evaluating the use of topical glyceryl trinitrate to facilitate peripheral artery cannulation in neonates. If our pilot randomized controlled trial confirms the benefits of glyceryl trinitrate patches, it will pave the way for large multicenter randomized controlled trials in this field.

Clinical Outcomes of Medical Management Options for Chronic Anal Fissures in a Long-Term Follow-up: Systematic Review and Meta-Analysis.

BACKGROUND: Topical treatments and botulinum toxin injections are valid options for the management of patients with chronic anal fissures (CAF), but little is known about the efficacy of these techniques in long-term follow-up. The aim of this meta-analysis was to evaluate the effectiveness, given to clinical outcomes, of medical treatments with calcium antagonists, nitroglycerin, and botulinum toxin on CAF treatment in adults. METHOD: A systemic review and meta-analysis developed according to PRISMA [PLoS Med. 2009 Jul 21;6(7):e1000100; BMJ. 2010 Mar 23;340:c332] and registered in PROSPERO (Registration number: CRD42020120386). A systematic literature search was conducted through MEDLINE, EMBASE, Web of Science, and Cochrane Library databases. Randomized control trials that compared medical treatment were identified; publications had to have a clinical definition of CAF with at least one of the following signs or symptoms: visible sphincter fibers at the base of the fissure, anal papillae, sentinel piles, and indurated margins. The symptoms had to be chronic for at least 4 weeks. Data were independently extracted for each study, and a meta-analysis was drawn using fixed- and random-effects models. RESULTS: 17 randomized trials met the inclusion criteria. Diltiazem showed a superior effect compared with glycerin (RR = 1.16 [95% CI = 1.05-1.30]; I2 = 18%) and with fewer adverse effects (RR = 0.13 [95% CI = 0.04-0.042]; I2 = 87%). Similar results were evidenced with the use of nifedipine compared with lidocaine (RR = 4.53 [95% CI = 2.99-6.86]; I2 = 28%). Botulinum toxin did not show statistically significant differences compared to glycerin (RR = 0.81 [95% CI = 0.02-29.36]; I2 = 93%) or isosorbide dinitrate (RR = 1.45 [95% CI = 0.32-6.54]; I2 = 85%). Regarding recurrence, nifedipine was superior to lidocaine (RR = 0.18 [95% CI = 0.08-0.44]; I2 = 31%). CONCLUSIONS: Calcium channel blockers performed well regarding the healing of CAF when compared to others in long-term follow-up. The superiority of botulinum toxin was not evidenced compared to topical treatments. More studies are needed to better assess recurrence rates.

Chemical Angioplasty with Nitroglycerin for Vasospasm after Subarachnoid Hemorrhage: Case Series and Review

Introduction Vasospasm is a common and potentially devastating complication in patients with subarachnoid hemorrhage, causing high morbidity and mortality. There is no effective and consistent way to prevent or treat cerebral vasospasm capable of altering the morbidity and mortality of this complication. Animal and human studies have attempted to show improvement in aneurysmal vasospasm. Some sought their prevention; others, the treatment of already installed vasospasm. Some achieved only angiographic improvement without clinical correlation, others achieved both, but with ephemeral duration or at the expense of very harmful associated effects. Endovascular techniques allow immediate and aggressive treatment of cerebral vasospasm and include methods such as mechanical and chemical angioplasty. These methods have risks and benefits. Objectives To analyze the results of chemical angioplasty using nitroglycerin (GTN). In addition, to performa comprehensive review and analysis of aneurysmal vasospasm. Methods We describe our series of 77 patients treated for 8 years with angioplasty for vasospasm, either mechanical (with balloon), chemical (with GTN) or both. Results Eleven patients received only balloon; 37 received only GTN; 29 received both. Forty-four patients (70.1%) evolved with delayed cerebral ischemia and 19 died (mortality of 24.7%). Two deaths were causally related to the rupture of the vessel by the balloon. The only predictors of poor outcome were the need for external ventricular drainage in the first hours of admission, and isolated mechanical angioplasty. Conclusions Balloon angioplasty has excellent results, but it is restricted to proximal vessels and is not without complications. Chemical angioplasty using nitroglycerin has reasonable but short-lived results and further research is needed about it. It is restricted to vasospasm angioplasties only in hospitals, like ours, where better and more potent vasodilator agents are not available.

Evidence-based review of methods used to reduce pain after excisional hemorrhoidectomy / Revisão baseada em evidências de métodos utilizados para reduzir a dor após hemorrroidectomia excisional

ABSTRACT Background: Excisional hemorrhoidectomy is one of the most commonly performed anorectal procedures. Despite the satisfactory outcomes of excisional hemorrhoidectomy, the pain perceived by the patients following the procedure can be a distressing sequel. This review aimed to search the current literature for the existing evidence on how to avoid or minimize the severity of post-hemorrhoidectomy pain. Methods: An organized literature search was performed using electronic databases including PubMed/Medline and Google Scholar service for the articles that evaluated different methods for pain relief after excisional hemorrhoidectomy. Then, the studies were summarized in a narrative way illustrating the hypothesis and the outcomes of each study. The methods devised to reduce pain after excisional hemorrhoidectomy were classified into three main categories: technical tips; systemic and topical agents; and surgical methods. The efficacy of each method was highlighted along the level of evidence supporting it. Results: Stronger evidence (level Ia) supported LigaSure hemorrhoidectomy and the use of glyceryl trinitrate ointment to be associated with significant pain relief after excisional hemorrhoidectomy whereas the remaining methods were supported by lower level of evidence (level Ib). Conclusion: The use of LigaSure in performing excisional hemorrhoidectomy and the application of topical glyceryl trinitrate ointment contributed to remarkable relief of postoperative pain after excisional hemorrhoidectomy according to the highest level of evidence. Perhaps a multimodality strategy that combines systemic and topical agents can be the optimal method for control of pain after excisional hemorrhoidectomy, yet further prospective trials are required to draw such conclusion.

RESUMO Introdução: A hemorroidectomia excisional (HE) é um dos procedimentos anorretais mais comumente realizados. Apesar dos resultados satisfatórios da hemorroidectomia excisional, a dor percebida pelos pacientes após o procedimento pode ser uma sequela angustiante. Esta revisão teve como objetivo buscar na literatura atual as evidências existentes sobre como evitar ou minimizar a gravidade da dor pós-hemorroidectomia. Métodos: Uma busca organizada da literatura foi realizada usando bancos de dados eletrônicos, incluindo PubMed/Medline e Google Scholar, para os artigos que avaliaram diferentes métodos para o alívio da dor após hemorroidectomia excisional. Em seguida, os estudos foram resumidos de forma narrativa, ilustrando a hipótese e os resultados de cada estudo. Os métodos desenvolvidos para reduzir a dor após a hemorroidectomia excisional foram classificados em três categorias principais: dicas técnicas; agentes sísticos e ticos; e métodos cirúrgicos. A eficácia de cada método foi destacada ao longo do nível de evidência que a suporta. Resultados: Evidências mais fortes (nível Ia) apoiaram a hemorroidectomia de LigaSure e o uso de pomada de trinitrato de glicerila para ser associado com alívio significativo da dor após hemorroidectomia excisional, enquanto os métodos restantes foram apoiados por menor nível de evidência (nível Ib). Conclusão: O uso de LigaSure na realização de hemorroidectomia excisional e a aplicação de pomada tópica de gliceril trinitrato contribuíram para o notável alívio da dor pós-operatória após hemorroidectomia excisional, de acordo com o maior nível de evidência. Talvez uma estratégia multimodal que combine agentes sistêmicos e tópicos possa ser o método ideal para o controle da dor após hemorroidectomia excisional, mas ainda são necessários mais estudos prospectivos para chegar a essa conclusão.

Guía de práctica clínica para el manejo de pacientes con angina estable: guía en versión extensa / Clinical practice guide for the management of patients with stable angina: extensive version guide

Este documento abarcar el manejo del paciente con angina estable.

Cardioprotección farmacológica en anestesia cardiovascular. Diltiazem vs nitroglicerina / Pharmacological cardioprotection in cardiovascular anesthesia. Diltiazem vs nitroglycerin

Introducción: en pacientes cardiópatas isquémicos se han diseñado diversas estrategias preventivas farmacológicas para limitar el daño por isquemia- reperfusión, con el fin de optimizar el balance en el consumo miocárdico de oxigeno. Objetivos: determinar qué estrategia cardio-protectora (nitroglicerina o diltiazem) es más efectiva en la revascularización coronaria.Métodos: se realizó un estudio comparativo aleatorio para evaluar el efecto cardio protector de la nitroglicerina y el diltiazem en pacientes intervenidos con el corazón latiendo. Resultados: se estudiaron 175 pacientes; los de nitroglicerina, grupo N=90 pacientes y los de diltiazem, grupo D=85. La isquemia miocárdica sostenida, en el grupo D fue del 20 por ciento vs N con 12 por ciento; p= 0,04. Primó el infra desnivel del ST[a1] . En el grupo N fue 10 % vs grupo D de 39 por ciento; p=0,002. La alteración segmentaria más frecuente fue la hipocinesia en el 36 por ciento de los pacientes. La acinesia fue superior en el grupo D, 9,4 por ciento v/s grupo N 4,4 por ciento; p=0,05. El valor promedio de tensión arterial media intraoperatoria fue en el grupo N=80 mm/Hg vs grupo D= 61,4 mm/Hg; p= 0,003. La frecuencia cardiaca media en el grupo N=63 lpm vs grupo D=50 lpm; p=0,006. La arritmia más frecuente fue la fibrilación auricular 28 por ciento, en el grupo N 34 por ciento vs grupo D 21 por ciento, p=0,037. El valor medio de la troponina Tus a las 24 h, en el grupo D=125 pg/ml, vs grupo N=97,7 pg/ml; p=0,042. Los efectos adversos fueron mínimos. La hipotensión arterial sostenida, en el grupo D fue 30 por ciento vs grupo N 5,5 por ciento; p=0,002. El bloqueo AV[a2] se observó en el grupo N 4 por ciento vs grupo D 15 por ciento; p=0,01. El IMA [a3] perioperatorio fue 2,2 veces más frecuente con diltiazem, que con nitroglicerina.Conclusiones: la infusión perioperatoria de nitroglicerina provee un mejor efecto cardio protector que el diltiazem en la prevención de eventos isquémicos ... (AU)

Introduction: in the cases of ischemic cardiopathy patients, different preventive strategies have been designed to limit the damage for ischemia-reperfusion, in order to optimize the balance in myocardial oxygen consumption. Objectives: To determine what cardio-protective (nitroglycerin or diltiazem) strategy is more effective in coronary revascularization. Methods: A randomized therapeutic trial was conducted to assess the cardio-protective effect of diltiazem and nitroglycerin in patients intervened with heart beating. Results: 175 patients were studied: the nitroglycerin group N=90 patients and the diltiazem group D=85. Sustained myocardial ischemia in group D was 20 percent vs. 12 percent in N; p=0.04. ST infra-imbalance prevailed. It was 10 percent in the N group vs 39 percent in group D; p = 0.002. The most frequent alteration was segmental hypokinesia in 36 percent of the patients. Akinesia was higher in group D, 9.4 percent vs. group N 4.4 percent; p = 0.05. The average value of mean intraoperative blood pressure was 80 mm/Hg in the group N vs.61.4 mm/Hg in group D; p = 0.003. The average heart rate in the group N was 63 bpm vs Group D which was 50 bpm; p = 0.006. The most common arrhythmia was atrial fibrillation 28 percent, in the N group 34 percent vs. group D 21 percent, p = 0.037. The average value of troponin after 24 h was 125 pg/ml in group D vs.97.7 pg/ml in group N; p = 0.042. Adverse effects were minimal. Sustained hypotension in group D was 30 percent vs 5.5 percent in group N; p = 0.002. AV block was observed in the group N 4 percent vs 15 percent in group D; p = 0.01. Perioperative IMA was 2.2 times more frequent with diltiazem than with nitroglycerin. Conclusions: Perioperative infusion of nitroglycerin provides better cardioprotective effect then diltiazem in preventing sustained ischemic events, associated with less release of T troponin and better hemodynamic stability. Diltiazem is associated with a decreased risk of postoperative ...(AU)

Aldehyde dehydrogenase 2 protects human umbilical vein endothelial cells against oxidative damage and increases endothelial nitric oxide production to reverse nitroglycerin tolerance.

Medical nitroglycerin (glyceryl trinitrate, GTN) use is limited principally by tolerance typified by a decrease in nitric oxide (NO) produced by biotransformation. Such tolerance may lead to endothelial dysfunction by inducing oxidative stress. In vivo studies have demonstrated that aldehyde dehydrogenase 2 (ALDH2) plays important roles in GTN biotransformation and tolerance. Thus, modification of ALDH2 expression represents a potentially effective strategy to prevent and reverse GTN tolerance and endothelial dysfunction. In this study, a eukaryotic expression vector containing the ALDH2 gene was introduced into human umbilical vein endothelial cells (HUVECs) by liposome-mediated transfection. An indirect immunofluorescence assay showed that ALDH2 expression increased 24 h after transfection. Moreover, real-time polymerase chain reaction and western blotting revealed significantly higher ALDH2 mRNA and protein expression in the gene-transfected group than in the two control groups. GTN tolerance was induced by treating HUVECs with 10 mM GTN for 16 h + 10 min, which significantly decreased NO levels in control cells, but not in those transfected with ALDH2. Overexpression of ALDH2 increased cell survival against GTN-induced cytotoxicity and conferred protection from oxidative damage resulting from nitrate tolerance, accompanied by decreased production of intracellular reactive oxygen species and reduced expression of heme oxygenase 1. Furthermore, ALDH2 overexpression promoted Akt phosphorylation under GTN tolerance conditions. ALDH2 gene transfection can reverse and prevent tolerance to GTN through its bioactivation and protect against oxidative damage, preventing the development of endothelial dysfunction.

Lidocaine alleviates propofol related pain much better than metoprolol and nitroglycerin / Lidocaína é mais eficaz do que metoprolol e nitroglicerina para o alívio da dor relacionada à injeção de propofol

ABSTRACTBACKGROUND AND OBJECTIVES: Injection pain after propofol administration is common and maydisturb patients' comfort. The aim of this study was to compare effectiveness of intravenous(iv) nitroglycerin, lidocaine and metoprolol applied through the veins on the dorsum of hand orantecubital vein on eliminating propofol injection pain.METHOD: There were 147 patients and they were grouped according to the analgesic adminis-tered. Metoprolol (n = 31, Group M), lidocaine (n = 32, Group L) and nitroglycerin (n = 29, GroupN) were applied through iv catheter at dorsum hand vein or antecubital vein. Pain was evalu-ated by 4 point scale (0 - no pain, 1 --- light pain, 2 --- mild pain, 3 --- severe pain) in 5, 10, 15and 20th seconds. ASA, BMI, patient demographics, education level and the effect of pathwaysfor injection and location of operations were analyzed for their effect on total pain score.RESULTS: There were no differences between the groups in terms of total pain score (p = 0.981).There were no differences in terms of total pain score depending on ASA, education level,location of operation. However, lidocaine was more effective when compared with metoprolol(p = 0.015) and nitroglycerin (p = 0.001) among groups. Although neither lidocaine nor metopro-lol had any difference on pain management when applied from antecubital or dorsal hand vein(p > 0.05), nitroglycerin injection from antecubital vein had demonstrated statistically lowerpain scores (p = 0.001).CONCLUSION: We found lidocaine to be the most effective analgesic in decreasing propofolrelated pain. We therefore suggest iv lidocaine for alleviating propofol related pain at operations.

RESUMOJUSTIFICATIVA E OBJETIVOS: A dor no local da injeção após a administração de propofol é comum e pode causar desconforto nos pacientes. O objetivo deste estudo foi comparar a eficácia de nitroglicerina, lidocaína e metoprolol, aplicados intravenosamente através de veias do dorso das mãos ou antecubitais, para eliminar a dor causada pela injeção de propofol.MÉTODOS: Foram alocados em grupos 147 pacientes de acordo com o analgésico administrado: metoprolol (n = 31, Grupo M), lidocaína (n = 32, Grupo L) e nitroglicerina (n = 29, Grupo N). Os analgésicos foram aplicados via cateter intravenoso em veia do dorso da mão ou antecubital. A dor foi avaliada com uma escala de quatro pontos (0 = sem dor, 1 = dor leve, 2 = dor moderada, 3 = dor intensa) nos segundos cinco, 10, 15 e 20. Os dados demográficos dos pacientes, estado físico ASA, IMC, nível de escolaridade, efeito das vias de injeção e local das cirurgias foram analisados quanto a seus efeitos no escore total de dor.RESULTADOS: Não houve diferença entre os grupos em relação ao escore total de dor (p = 0,981). Não houve diferença no escore total de dor em relação ao estado físico ASA, escolaridade e local da cirurgia. No entanto, lidocaína foi mais eficaz em comparação com metoprolol (p = 0,015) e nitroglicerina (p = 0,001), na comparação entre os grupos. Embora lidocaína e metoprolol não tenham apresentado diferença no tratamento da dor quando aplicados em veia antecubital ou do dorso da mão (p > 0,05), a injeção de nitroglicerina em veia antecubital apresentou escores de dor estatisticamente menores (p = 0,001).CONCLUSÃO: Lidocaína mostrou-se como analgésico mais eficaz para diminuir a dor relacionada à injeção de propofol. Sugerimos, portanto, lidocaína IV para aliviar a dor relacionada à injeção de propofol em operações.

Lidocaine alleviates propofol related pain much better than metoprolol and nitroglycerin.

BACKGROUND AND OBJECTIVES: Injection pain after propofol administration is common and may disturb patients' comfort. The aim of this study was to compare effectiveness of intravenous (iv) nitroglycerin, lidocaine and metoprolol applied through the veins on the dorsum of hand or antecubital vein on eliminating propofol injection pain. METHOD: There were 147 patients and they were grouped according to the analgesic administered. Metoprolol (n=31, Group M), lidocaine (n=32, Group L) and nitroglycerin (n=29, Group N) were applied through iv catheter at dorsum hand vein or antecubital vein. Pain was evaluated by 4 point scale (0 - no pain, 1 - light pain, 2 - mild pain, 3 - severe pain) in 5, 10, 15 and 20th seconds. ASA, BMI, patient demographics, education level and the effect of pathways for injection and location of operations were analyzed for their effect on total pain score. RESULTS: There were no differences between the groups in terms of total pain score (p=0.981). There were no differences in terms of total pain score depending on ASA, education level, location of operation. However, lidocaine was more effective when compared with metoprolol (p=0.015) and nitroglycerin (p=0.001) among groups. Although neither lidocaine nor metoprolol had any difference on pain management when applied from antecubital or dorsal hand vein (p>0.05), nitroglycerin injection from antecubital vein had demonstrated statistically lower pain scores (p=0.001). CONCLUSION: We found lidocaine to be the most effective analgesic in decreasing propofol related pain. We therefore suggest iv lidocaine for alleviating propofol related pain at operations.

Utilização da Tomografia de Coerência Ótica na Abordagem de Lesão Intermediária em Paciente com Síndrome Coronariana Aguda / Optical Coherence Tomography in the Management of Intermediate Lesion in a Patient with Acute Coronary Syndrome

A tomografia de coerência ótica fornece imagens tomográficas da microestrutura coronária em alta resolução, possibilitando detalhada caracterização dos componentes e da morfologia da placa aterosclerótica, além de acurada determinação das dimensões vasculares. Relatamos aqui o caso de um paciente com lesão intermediária, na fase subaguda de um infarto do miocárdio, no qual a tomografia de coerência ótica foi utilizada como método diagnóstico complementar para a tomada de decisão e para guiar o procedimento...

Optical coherence tomography provides high-resolution tomography imaging of the coronary microstructure, allowing for detailed characterization of atherosclerotic plaque components and morphology, in addition to an accurate determination of vascular dimensions. We report the case of a patient with an intermediate coronary lesion, presenting in the subacute phase of a myocardial infarction, in whom optical coherence tomography was used as an adjunctive diagnostic method to aid in the decision-making process and to guide the interventional procedure...

The effects of local nitroglycerin on the surgical delay procedure in prefabricated flaps by vascular implant in rats.

PURPOSE: To evaluate the effect of local nitroglycerin on the viable area of a prefabricated flap for vascular implant in rats, and to investigate the surgical delay procedure. METHODS: A femoral pedicle was implanted under the skin of the abdominal wall in forty Wistar rats. The animals were divided into four groups of ten: group 1 - without surgical delay procedure and local nitroglycerin; group 2 - with surgical delay procedure, but without local nitroglycerin; group 3 - without surgical delay procedure, but with local nitroglycerin; and group 4 - with simultaneous surgical delay procedure and local nitroglycerin. The percentages of the viable areas, in relation to the total flap, were calculated using AutoCAD R 14. RESULTS: The mean percentage value of the viable area was 8.9% in the group 1. 49.4% in the group 2; 8.4% in the group 3 and 1.1% in the group 4. There was significant difference between groups 1 and 2 (p=0.005), 1 and 4 (p=0.024), 2 and 3 (p=0.003), 2 and 4 (p=0.001). These results support the hypothesis that the closure of the arterial venous channels is responsible for the phenomenon of surgical delay procedure. CONCLUSION: Local nitroglycerin did not cause an increase in the prefabricated viable flap area by vascular implantation and decreased the viable flap area that underwent delay procedures.

The effects of local nitroglycerin on the surgical delay procedure in prefabricated flaps by vascular implant in rats / Efeitos da nitroglicerina tópica na autonomização de retalhos pré-fabricados por implante vascular em ratos

PURPOSE: To evaluate the effect of local nitroglycerin on the viable area of a prefabricated flap for vascular implant in rats, and to investigate the surgical delay procedure. METHODS: A femoral pedicle was implanted under the skin of the abdominal wall in forty Wistar rats. The animals were divided into four groups of ten: group 1 - without surgical delay procedure and local nitroglycerin; group 2 - with surgical delay procedure, but without local nitroglycerin; group 3 - without surgical delay procedure, but with local nitroglycerin; and group 4 - with simultaneous surgical delay procedure and local nitroglycerin. The percentages of the viable areas, in relation to the total flap, were calculated using AutoCAD R 14. RESULTS: The mean percentage value of the viable area was 8.9% in the group 1. 49.4% in the group 2; 8.4% in the group 3 and 1.1% in the group 4. There was significant difference between groups 1 and 2 (p=0.005), 1 and 4 (p=0.024), 2 and 3 (p=0.003), 2 and 4 (p=0.001). These results support the hypothesis that the closure of the arterial venous channels is responsible for the phenomenon of surgical delay procedure. CONCLUSION: Local nitroglycerin did not cause an increase in the prefabricated viable flap area by vascular implantation and decreased the viable flap area that underwent delay procedures.

OBJETIVO: Avaliar o efeito da nitroglicerina tópica sobre a área viável de um modelo de retalho pré-fabricado por implante vascular em ratos e analisar o mecanismo de autonomização cirúrgica aplicada a retalhos pré-fabricados. MÉTODOS: Foram utilizados 40 ratos Wistar. No primeiro tempo cirúrgico - 20 ratos foram submetidos a implante do pedículo femoral na região subdérmica da parede abdominal, e 20 submetidos à autonomização cirúrgica de retalho cutâneo de parede abdominal e, simultaneamente, implante do pedículo femoral na região subdérmica deste retalho. No segundo tempo - após três semanas e em todos os animais, era elevado um retalho cutâneo ilhado, pediculado unicamente nos vasos implantados e divididos em quatro grupos de dez animais: grupo 1, com retalhos submetidos unicamente a implante do pedículo femoral na região subdérmica da parede abdominal; grupo 2, com retalhos submetidos à autonomização cirúrgica e implante do pedículo femoral na região subdérmica deste retalho; grupo 3, com retalhos submetidos unicamente a implante do pedículo femoral na região subdérmica da parede abdominal tratados com nitroglicerina tópica; grupo 4, com retalhos submetidos à autonomização cirúrgica e implante do pedículo femoral na região subdérmica deste retalho tratados com nitroglicerina tópica. O percentual de área viável, em relação à área total do retalho, foi calculado sete dias após o segundo tempo cirúrgico. RESULTADOS: O valor médio de área viável alcançou 8,9% no grupo 1; 49,4% no grupo 2; 8,4% no grupo 3; e 1,1% no grupo 4. Houve diferença significante entre os grupos 1 e 2 (p=0,005); 1 e 4 (p=0,024); 2 e 3 (p=0,003) e 2 e 4 (p=0,001). Os resultados fortaleceram a hipótese de que o fechamento dos canais arteriovenosos é o principal mecanismo responsável pelo aumento da área viável observada em retalhos submetidos à autonomização cirúrgica.CONCLUSÃO: A nitroglicerina tópica não induziu ao aumento da área viável dos retalhos pré-fabricados por implante vascular e diminuiu a área viável dos retalhos submetidos à autonomização.

Impacto dos stents e do sirolimus por via oral na vasomotilidade coronariana dependente e independente do endotelio / Impact of stenting and oral sirolimus on endothelium-dependent and independent coronary vasomotion

FUNDAMENTO: Não há consenso sobre o impacto do implante de stent sobre a função endotelial no longo prazo. Há relatos de disfunção endotelial aumentada com stent com sirolimus quando comparado com o stent metálico convencional (BMS). OBJETIVO: Este estudo visa a avaliar o impacto do BMS e o efeito do sirolimus por via oral sobre a função endotelial. MÉTODOS: Quarenta e cinco pacientes foram randomizados em três grupos: BMS + altas doses de sirolimus oral (dose inicial de 15 mg, seguida de 6 mg/dia durante quatro semanas); BMS + baixa dose de sirolimus (6 mg, seguida de 2 mg por dia durante quatro semanas) e BMS sem sirolimus. Mudanças na vasoconstrição ou vasodilatação, em um segmento de 15 milímetros começando pelo extremo distal do stent em resposta a acetilcolina e nitroglicerina, foram avaliadas por angiografia quantitativa. RESULTADOS: Os grupos apresentaram características angiográficas semelhantes. A variação percentual de diâmetro em resposta a acetilcolina foi semelhante em todos os grupos, nos dois momentos (p = 0,469). Quatro horas após o implante de stent, o segmento alvo apresentou uma disfunção endotelial que se manteve após oito meses em todos os grupos. Em todos os grupos, a vasomotricidade independente de endotélio em resposta a nitroglicerina foi semelhante, às quatro horas e aos oito meses, com diâmetro do segmento alvo aumentado após a infusão de nitroglicerina (p = 0,001). CONCLUSÃO: A disfunção endotelial esteve igualmente presente no segmento distal de 15 milímetros do segmento tratado, às 4 horas e aos 8 meses após implante do stent. O sirolimus administrado por via oral durante quatro semanas para evitar a reestenose não afetou o estado de vasomotricidade endotélio dependente e independente.

BACKGROUND: There is no consensus regarding the impact of stenting on long-term endothelial function. There have been reports of increased endothelial dysfunction with sirolimus-eluting stents as compared to bare metal stenting (BMS). OBJECTIVE: This study aims to assess the impact of BMS and the effect of oral sirolimus on endothelial function. METHODS: Forty-five patients were randomized into three groups: BMS + high-dose oral sirolimus (initial dose of 15 mg, followed by 6 mg/day for four weeks); BMS + low-dose sirolimus (6 mg followed by 2 mg daily for four weeks); and BMS without sirolimus. Changes in vasoconstriction or vasodilation in a 15 mm segment starting at the distal stent end in response to acetylcholine and nitroglycerin were assessed by quantitative angiography. RESULTS: The groups had similar angiographic characteristics. The percent variation in diameter in response to acetylcholine was similar in all groups at the two time points (p = 0.469). Four hours after stenting, the target segment presented an endothelial dysfunction that was maintained after eight months in all groups. In all groups, endothelium-independent vasomotion in response to nitroglycerin was similar at four hours and eight months, with increased target segment diameter after nitroglycerin infusion (p = 0.001). CONCLUSION: The endothelial dysfunction was similarly present at the 15 mm segment distal to the treated segment, at 4 hours and 8 months after stenting. Sirolimus administered orally during 4 weeks to prevent restenosis did not affect the status of endothelium-dependent and independent vasomotion.

Impact of stenting and oral sirolimus on endothelium-dependent and independent coronary vasomotion.

BACKGROUND: There is no consensus regarding the impact of stenting on long-term endothelial function. There have been reports of increased endothelial dysfunction with sirolimus-eluting stents as compared to bare metal stenting (BMS). OBJECTIVE: This study aims to assess the impact of BMS and the effect of oral sirolimus on endothelial function. METHODS: Forty-five patients were randomized into three groups: BMS + high-dose oral sirolimus (initial dose of 15 mg, followed by 6 mg/day for four weeks); BMS + low-dose sirolimus (6 mg followed by 2 mg daily for four weeks); and BMS without sirolimus. Changes in vasoconstriction or vasodilation in a 15 mm segment starting at the distal stent end in response to acetylcholine and nitroglycerin were assessed by quantitative angiography. RESULTS: The groups had similar angiographic characteristics. The percent variation in diameter in response to acetylcholine was similar in all groups at the two time points (p = 0.469). Four hours after stenting, the target segment presented an endothelial dysfunction that was maintained after eight months in all groups. In all groups, endothelium-independent vasomotion in response to nitroglycerin was similar at four hours and eight months, with increased target segment diameter after nitroglycerin infusion (p = 0.001). CONCLUSION: The endothelial dysfunction was similarly present at the 15 mm segment distal to the treated segment, at 4 hours and 8 months after stenting. Sirolimus administered orally during 4 weeks to prevent restenosis did not affect the status of endothelium-dependent and independent vasomotion.

Tratamiento médico de la fisura anal con tadafilo tópico como principio activo / Medical treatment of chronic anal fissure with topical tadalafil

Introducción: La fisura anal es una úlcera lineal dolorosa que generalmente, aparece en la línea media posterior del canal anal, extendiéndose desde la línea dentada hasta el margen del ano. Su persistencia se debe al espasmo anómalo del músculo del esfínter interno. Hasta hace poco, la curación definitiva de las fisuras solo se logró mediante procedimientos quirúrgicos dirigidos a la ablación del espasmo esfinteriano. Diseño: Estudio prospectivo, controlado y aleatorio para comprobar la hipótesis de que la aplicación tópica de una preparación de Tadalafilo es un método efectivo y seguro para relajar el músculo liso y promover la cicatrización de la fisura anal. Población y métodos: Se seleccionaron los pacientes que acudieron a la consulta de coloproctología del HCC con diagnóstico de fisura anal (726). Todos fueron sometidos a una historia clínica y examen físico, antes del comienzo del tratamiento y seguimiento por 1 año. Los pacientes fueron divididos en tres grupos: Grupo A: tratados de forma médica con AINES por via oral, sediluvios y pomadas tópicas de esteroides 3 veces al dia. Grupo B: tratados con nitroglicerina 0,25% locales crema 3 veces al día. Grupo C: tratados con toxina botulínica inyectada 1 sola dosis en el espesor del esfínter interno del ano. Grupo D: tratados con formula magistral crema tópica de Tadalafilo aplicada 3 veces al día. Grupo E: pacientes a quienes se les realiza la Esfinterotomía Lateral Interna una vez que se considera ha fracasado el manejo médico y tratamiento farmacológico. Resultados: Se encontró predominio del sexo femenino con 370 pacientes (50.97%). Las edades en las cual se agrupó mayor cantidad de individuos fue entre los 26 a 35 años con 218 pacientes (30,02%). Predominó el diagnóstico de fisura crónica con 382 casos (52,61 %). El tratamiento inicial que se utilizó más frecuentemente fue el quirúrgico con 270 pacientes (37,19%), seguido de Tadalafilo tópico con 196 pacientes (26,99%)...

Introduction: Anal fissure is a painful linear ulcer usually appears in the posterior midline of the anal canal, extending from the dentate line to the margin of the anus. Its persistence is due to spasm abnormal internal sphincter muscle. Until recently, a definitive cure was achieved only cracks by surgical procedures aimed at ablation of the sphincter spasm. Design: Prospective. controlled trial to test the hypothesis that topical application of a preparation of Tadalafil is a safe and effective method to relax the smooth muscle and promote healing of anal fissure. Population and methods: We selected patients who attended the consultation of Coloproctology of HCC diagnosed with anal fissure (726). AIl underwent a medical history and physical examination before starting treatment and followed for 1 year. The patients were divided into three groups: Group A: treated medical oral NSAlDs, topical ointments sediluvios and steroids 3 times a day. Group B: treated with local nitroglycerin cream 0.25% 3 times a day. Group C: treated with botulinum toxin injection 1 dose in the thickness of the internal anal sphincter. Group D: treated with topical cream formulation TadalafiI masterfully applied 3 times a day. Group E: patients who underwent lateral internal sphincterotomy is considered after failed medical management and pharmacological treatment. Results: There was a predominance of females with 370 patientes (50.97%). The ages at which more individuals grouped was between 26 to 35 years with 218 patients (30.02%). The predominant diagnosis of chronic fissure with 382 cases (52.61%). The initial treatment was most frequently used surgical treatment of 270 patients (37.19%), followed by topical Tadalafil 196 patients (26.99%). The initial treatment had less failure was the use of topical Tadalafil 10 cases (1.37%), which required surgery...

Tratamiento médico de la fisura anal con tadafilo tópico como principio activo / Medical treatment of chronic anal fissure with topical tadalafil

Introducción: La fisura anal es una úlcera lineal dolorosa que generalmente, aparece en la línea media posterior del canal anal, extendiéndose desde la línea dentada hasta el margen del ano. Su persistencia se debe al espasmo anómalo del músculo del esfínter interno. Hasta hace poco, la curación definitiva de las fisuras solo se logró mediante procedimientos quirúrgicos dirigidos a la ablación del espasmo esfinteriano. Diseño: Estudio prospectivo, controlado y aleatorio para comprobar la hipótesis de que la aplicación tópica de una preparación de Tadalafilo es un método efectivo y seguro para relajar el músculo liso y promover la cicatrización de la fisura anal. Población y métodos: Se seleccionaron los pacientes que acudieron a la consulta de coloproctología del HCC con diagnóstico de fisura anal (726). Todos fueron sometidos a una historia clínica y examen físico, antes del comienzo del tratamiento y seguimiento por 1 año. Los pacientes fueron divididos en tres grupos: Grupo A: tratados de forma médica con AINES por via oral, sediluvios y pomadas tópicas de esteroides 3 veces al dia. Grupo B: tratados con nitroglicerina 0,25% locales crema 3 veces al día. Grupo C: tratados con toxina botulínica inyectada 1 sola dosis en el espesor del esfínter interno del ano. Grupo D: tratados con formula magistral crema tópica de Tadalafilo aplicada 3 veces al día. Grupo E: pacientes a quienes se les realiza la Esfinterotomía Lateral Interna una vez que se considera ha fracasado el manejo médico y tratamiento farmacológico. Resultados: Se encontró predominio del sexo femenino con 370 pacientes (50.97%). Las edades en las cual se agrupó mayor cantidad de individuos fue entre los 26 a 35 años con 218 pacientes (30,02%). Predominó el diagnóstico de fisura crónica con 382 casos (52,61 %). El tratamiento inicial que se utilizó más frecuentemente fue el quirúrgico con 270 pacientes (37,19%), seguido de Tadalafilo tópico con 196 pacientes (26,99%)...(AU)

Introduction: Anal fissure is a painful linear ulcer usually appears in the posterior midline of the anal canal, extending from the dentate line to the margin of the anus. Its persistence is due to spasm abnormal internal sphincter muscle. Until recently, a definitive cure was achieved only cracks by surgical procedures aimed at ablation of the sphincter spasm. Design: Prospective. controlled trial to test the hypothesis that topical application of a preparation of Tadalafil is a safe and effective method to relax the smooth muscle and promote healing of anal fissure. Population and methods: We selected patients who attended the consultation of Coloproctology of HCC diagnosed with anal fissure (726). AIl underwent a medical history and physical examination before starting treatment and followed for 1 year. The patients were divided into three groups: Group A: treated medical oral NSAlDs, topical ointments sediluvios and steroids 3 times a day. Group B: treated with local nitroglycerin cream 0.25% 3 times a day. Group C: treated with botulinum toxin injection 1 dose in the thickness of the internal anal sphincter. Group D: treated with topical cream formulation TadalafiI masterfully applied 3 times a day. Group E: patients who underwent lateral internal sphincterotomy is considered after failed medical management and pharmacological treatment. Results: There was a predominance of females with 370 patientes (50.97%). The ages at which more individuals grouped was between 26 to 35 years with 218 patients (30.02%). The predominant diagnosis of chronic fissure with 382 cases (52.61%). The initial treatment was most frequently used surgical treatment of 270 patients (37.19%), followed by topical Tadalafil 196 patients (26.99%). The initial treatment had less failure was the use of topical Tadalafil 10 cases (1.37%), which required surgery...(AU)

Failure of nitroglycerin (glyceryl trinitrate) to improve villi hypoperfusion in endotoxaemic shock in sheep.

OBJECTIVE: To evaluate the effects of nitroglycerin (glyceryl trinitrate) on intestinal microcirculation during endotoxaemic shock. DESIGN: Controlled experimental study. SETTING: Research laboratory. SUBJECTS: 20 anaesthetised, mechanically ventilated sheep. INTERVENTIONS: Septic shock was induced by endotoxin infusion. After 60 minutes without resuscitation, sheep received fluid resuscitation and were randomised to control or nitroglycerin groups. Nitroglycerin was infused at a rate of 0.2 µg/kg/min for 90 minutes. MAIN OUTCOME MEASURE: Improved villi microcirculation. RESULTS: Endotoxin lowered arterial blood pressure, cardiac output and intestinal blood flow, which were improved by fluid resuscitation. Mean (SD) ileal intramucosal-arterial PCO2 gradient increased during shock and remained elevated after resuscitation in control and nitroglycerin groups (8 [8], 15 [9] and 17 [9], and 6 [6], 13 [11] and 14 [9]mmHg, respectively; P < 0.05, baseline v shock and resuscitation for both groups). Villi microvascular flow index was reduced during shock and remained lower than baseline after the resuscitation in both groups (3.0 [0.0], 2.5 [0.2] and 2.7 [0.2], and 3.0 [0.0], 2.3 [0.3] and 2.6 [0.3], respectively; P < 0.05, baseline v shock and resuscitation for both groups). The red blood cell velocity behaved similarly (859 [443], 553 [236] and 670 [276], and 886 [440], 447 [124] and 606 [235] µm/s, respectively; P < 0.05, baseline v shock and resuscitation for both groups). CONCLUSIONS: In endotoxaemic sheep, low doses of nitroglycerin failed to improve the subtle but persistent villi hypoperfusion that remains present after fluid resuscitation.

Coronary-artery spasm after coronary artery bypass graft surgery without extracorporeal circulation: diagnostic and management.

Coronary artery spasm in perioperative of coronary artery bypass graft surgery is a serious complication, with high rate mortality. Patient 51 years-old submitted to coronary artery bypass graft surgery without Extracorporeal Circulation. The patient evolved in 1st post operative (PO) day with enzymatic alteration and ST-elevation, developing soon afterwards in ventricular fibrillation, defibrillation with success. Cardiac catheterization showed important spasm of all coronary arteries and anastomosis between the left internal thoracic artery and the left anterior interventricular artery. Intracoronary Vasodilators and intra-graft, with re-establishment of their usual and immediate calibers to improve clinic and Hemodynamic stability was used. Satisfactory evolution, discharged at 13rd PO day.

Preclinical noninvasive markers of atherosclerosis in children and adolescents with type 1 diabetes are influenced by physical activity.

OBJECTIVES: To measure preclinical noninvasive markers of atherosclerosis in youth with type 1 diabetes (T1DM), and to determine their associations between physical activity level and cardiorespiratory fitness (maximal oxygen consumption [VO2max]). STUDY DESIGN: This was a cross-sectional study including 32 patients with T1DM and 42 healthy subjects aged 6 to 17 years. Main outcome measures included arterial flow-mediated dilation (FMD) and intima-media thickness with high-resolution ultrasonography; physical activity by accelerometer (valid 26 patients with T1DM, 35 healthy subjects) and VO2max. RESULTS: Compared with healthy control subjects, patients with T1DM had higher intima-media thickness (mean 0.50 mm [0.48-0.52, 95% CI] vs 0.48 [0.47-0.49], P=.02) and reduced FMD (4.9% [4.1%-5.7%] vs 7.3 [6.4-8.1], P=.001), VO2max (45.5 mL/kg/min [43.0-48.0] vs 48.7 [46.7-50.6], P