Vascular access cannulation in hemodialysis patients: technical approach / Canulação do acesso vascular em pacientes em hemodiálise: abordagem técnica

ABSTRACT Introduction: The vascular access cannulation technique varies among clinics, and guidelines on vascular access give little importance to cannulation techniques. The objective of this study was to evaluate the cannulation technique and to determine which factors are associated with each detail of the technique. Material and methods: The vascular access cannulation was evaluated in 260 patients undergoing hemodialysis. The type and anatomical location of the vascular access, the cannulation technique, direction, gauge, and distance between needles, besides bevel direction and needle rotation were registered. Results: The arteriovenous fistula was the most frequent vascular access (88%), the most used cannulation technique was area (100%), the needle direction was anterograde in most cases (79.5%), and the mean distance between the tips of needles was 7.57±4.43 cm. For arteriovenous grafts, the proximal anatomical location (brachial artery) and cannulation with 16G needles in anterograde position were more predominant. For arteriovenous fistulas, the distal anatomical location (radial artery) and cannulation through 15G needles were more common. Cannulation of vascular access in retrograde direction was associated with a greater distance between needles (13.2 ± 4.4 vs 6.1 ± 3 cm, p < 0.001). Kt/V was higher when the distance between needles was higher than 5 cm (1.61 ± 0.3 vs. 1.47 ± 0.28, p < 0.01). Conclusions: The vascular access cannulation technique depends on the vascular access characteristics and expertise of cannulators. Clinical trials are required for the formulation of guidelines for vascular access cannulation.

RESUMO Introdução: A técnica de canulação do acesso vascular varia entre instituições de saúde, e as diretrizes sobre o acesso vascular dão pouca importância às técnicas de canulação. O objetivo deste estudo foi avaliar a técnica de canulação e determinar quais fatores estão associados a cada detalhe da técnica. Material e métodos: A canulação do acesso vascular foi avaliada em 260 pacientes em hemodiálise. Foram registrados o tipo e localização anatômica do acesso vascular, a técnica de canulação, a direção, a bitola e a distância entre as agulhas, além da direção do bisel e da rotação da agulha. Resultados: A fístula arteriovenosa foi o acesso vascular mais frequente (88%), a técnica de canulação mais utilizada foi a área (100%), a direção da agulha foi anterógrada na maioria dos casos (79,5%) e a distância média entre as pontas das agulhas foi de 7,57 ± 4,43 cm. Para enxertos arteriovenosos, a localização anatômica proximal (artéria braquial) e a canulação com agulhas 16G em posição anterógrada foram mais predominantes. Para as fístulas arteriovenosas, a localização anatômica distal (artéria radial) e a canulação através de agulhas 15G foram mais comuns. A canulação do acesso vascular na direção retrógrada foi associada a uma maior distância entre as agulhas (13,2 ± 4,4 v.s. 6,1 ± 3 cm, p < 0,001). O Kt / V foi maior quando a distância entre as agulhas foi superior a 5 cm (1,61 ± 0,3 vs. 1,47 ± 0,28, p < 0,01). Conclusões: A técnica de canulação do acesso vascular depende das características do acesso vascular e da experiência dos "canuladores". Ensaios clínicos são necessários para a formulação de diretrizes para a canulação do acesso vascular.

Eficacia y complicaciones de la técnica de doble guía durante la canulación de la vía biliar principal / Efficacy and complications of double guidewire technique in biliary tract cannulation

RESUMEN Objetivo: Determinar la eficacia y seguridad de la técnica de doble guía en pacientes con canulación difícil durante una CPRE. Materiales y métodos: El presente estudio se realizó, entre el mes de enero del 2015 y julio del 2016. Se procedió a sintetizar la data, de éxito y complicaciones de la TDG en pacientes con canulación difícil y cuando la inserción de la guía en el conducto pancreático fue hecha involuntariamente después de una técnica estándar. Resultados: 24 pacientes sometidos a una CPRE con TDG; 17 fueron mujeres (70,8%) y 7 varones (29,2%). La edad promedio fue 65,21±16,49 años. La indicación más frecuente fue coledocolitiasis en 62,5 %, luego colangiocarcinoma, 12,5 %. El diagnóstico final post CPRE, fue coledocolitiasis en 45,8%, seguido por fibrosis de papila, 29,2%. El éxito de la técnica de la doble guía fue de 87,5%. Hubo 3 casos de canulación frustra con la TDG, dos pacientes presentaron pancreatitis post CPRE (8,3%), no hubo casos de perforaciones. Conclusiones: La TDG es una alternativa eficaz a la CPRE catalogada como de canulación difícil por técnica convencional, sea cual fuere la etiología, con un alto porcentaje de éxito técnico y con una tasa baja de pancreatitis post CPRE, semejante a la reportada en otros países.

ABSTRACT Objective: To determine the efficacy and safety of double guidewire technique in patients with difficult biliary cannulation during ERCP. Materials and methods: We conducted a retrospective cohort study of all ERCPs performed between January 2015 and July 2016. DGT was performed in patients for whom biliary cannulation was difficult and guidewire insertion into the pancreatic duct (PD) was inadvertently achieved while attempting the standard WGC technique. Results: 24 patients were enrolled with ERCP and DGT; 17 were female (70.8%) and 7 male (29.2%). The average age was 65.21±16.49 years. The most frequent indication was choledocholithiasis (62.5%), then cholangiocarcinoma (12.5%). Post ERCP diagnosis was choledocholithiasis (45.8%), and papillary fibrosis (29.2%). The success of DGT was 87.5%. Three cases of failure cannulation with the DGT were reported, two patients had pancreatitis post ERCP (8.3%), there were no cases of perforations. Conclusions: TDG, is an effective alternative to difficult biliary cannulation during ERCP with conventional methods; with a high success rate and low rate of post ERCP pancreatitis, similarly to reported in other countries.

Tratamento de lesões calcificadas com uso do dispositivo Tornus: relato de dois casos / Treatment of calcified lesions with the tornus device: report of two cases

Apresenta-se neste relato o tratamento bem-sucedido de dois pacientes com lesões coronárias complexas, calcificadas, sendo uma delas uma oclusão total crônica, na qual foi utilizado um novo dispositivo para facilitar o procedimento percutâneo.

We describe two complex cases of calcified lesions, one of which a total chronic occlusion, that were successfully treated with a new device that facilitates the percutaneous procedure.

Randomized prospective evaluation of nephrostomy tube configuration: impact on postoperative pain

OBJECTIVE: Conduct a prospective randomized single-blind comparison of two nephrostomy catheter designs, evaluating specifically intraoperative placement and postoperative comfort. MATERIALS AND METHODS: The single-blind, prospective randomized trial was conducted with institutional review board approval. All patients undergoing percutaneous nephrolithotomy who gave informed consent were randomized to placement of either a Boston Scientific Flexima 8.3F pigtail nephrostomy tube #27-180 (PIG) or a Boston Scientific 8.2F nephroureteral stent #410-126 (NUS). Randomization was concealed from the surgeon until time of placement. Subjective intraoperative placement characteristics were rated by the surgeon on a scale of 1 = excellent, 2 = fair, 3 = good and 4 = poor. The patient's postoperative pain intensity was evaluated with a Visual Analog Pain Score (0 = no pain to 10 = worst pain). RESULTS: Nine patients were randomized to each group. The PIG group was rated significantly better than the NUS group with regards to ease of placement (p = 0.007) and radiopacity of the tube (p = 0.007) by surgeon. Visual analog pain scores on postoperative day one, was significantly lower in the PIG group (mean = 2+/-2) than the NUS group (mean = 5+/-1) (p = 0.004). The mean amount of intra-venous morphine equivalent given in the PIG group (mean = 1+/4 Eq morphine) was less on average compared to the NUS group (mean = 6+/13 Eq morphine), but the differences did not reach statistical significance (p = 0.06). CONCLUSIONS: Following percutaneous nephrolithotomy, use of a small pig-tail nephrostomy tube results in greater ease of placement and less postoperative pain than a nephroureteral catheter.

Analgesia interpleural / Interpleural analgesia

O autor em face de sua preliminar experiência pessoal com uma nova técnica de analgesia regional, com bons resultados faz uma revisäo bibliográfica crítica do assunto. Descreve a técnica usada, as indicaçöes, vantagens e complicaçöes. Coloca em discussäo as controvérsias existentes, como a terminologia mais correta, mecanismos de açäo, possível envolvimento da cadeia simpática torácica, melhor dose do A. L., adiçäo de adrenalina, distribuiçäo do A. L., e, ainda, outras possíveis indicaçöes, como, também, os potenciais efeitos adversos. A conclusäo enfatiza a necessidade de mais estudos para o benefício e segurança do paciente e, também, da anestesiologia moderna.

Implantación de catéter blando por peritoneoscopia: experiencia de 2 años en el Hospital de Especialidades del Centro Médico Nacional La Raza IMSS / Implantation of soft catheters through peritoneoscopy. Two years experience in the specialities Hospital at the National Medical Center \"La Raza\", IMSS

Objetivo. Informar acerca de la morbimortalidad en la implantación del catéter blando para diálisis peritoneal, mediante peritoneoscopia. Diseño. Estudio retrospectivo, longitudinal y observacional, sin grupo testigo. Sitio. Servicio de Cirugía General del Hospital de Especialidades del Centro Médico Nacional, La Raza del IMSS, D.F. Pacientes. Se estuadiaron 549 sujetos con insuficiencia renal crónica en un programa de diálisis peritoneal. Trescientos diez y nueve fueron varones (58 por ciento), y 230 mujeres (42 por ciento), con una media de 22 años de edad. Resultados. El catéter blando recto se implantó en 227 (52 por ciento) y el curso (Swan-neck) en 214 (48 por ciento). La duración del procedimiento fue de 20 minutos. Las complicaciones tempranas se observaron en un 2 por ciento y las tardías en un 10 por ciento, se practicó omentectomía en el 3 por ciento de los enfermos. El recuento celular en el líquido de dialisis fue de cero. La sobrevida del catéter a dos años es de 75 por ciento y la mortalidad entre los pacientes es de cero. Conclusión. El procedimiento es rápido, brinda comodidad y seguridad al paciente, la frecuencia de complicaciones es menos en comparación con el método quirúrgico