Simple Local Method Research Articles

A novel, simple near-infrared thoracoscopic technique by a particular route for locating lung nodules.

The localization of pulmonary nodules prior to thoracoscopic surgery remains challenging for thoracic surgeons, especially for those nodules that are not visible or palpable on the lung surface. Our study is a simple and effective minimally invasive method using indocyanine green through a special pathway to locate pulmonary nodules and fluorescence thoracoscopic surgery. Thoracoscopic surgery was performed for 18 undiagnosed peripheral non-solid nodules no larger than 2 cm after location. After 0.3 mg/kg indocyanine green was injected through the peripheral vein, the puncture needle was pulled out after it reached approximately 1 cm of the pulmonary parenchyma near the nodules. This was followed by transfer to the operating room. The nodule was initially localized by using a near-infrared thoracoscope to visualize indocyanine green fluorescence. Then, thoracoscopic resection was performed. Eighteen patients received this special and simple localization method, and underwent near-infrared, image-guided, video-assisted thoracoscopic surgery resection. Median computed tomography (CT) tumor size was 1.2 cm. Median depth from the pleural surface is 1.6 cm (range, 0.1-4.6 cm). The median time of CT-guided intervention was 12 min. The duration of thoracoscopic surgery was 67 min. Indocyanine green fluorescence was clearly identified in 17 of 18 patients (94.4%). The surgical margins were all negative on final pathology. The final diagnoses included 17 primary lung cancers, and 1 benign lung tumor. CT-guided single puncture of indocyanine green after peripheral intravenous injection is a simple, effective, and safe method to locate the nodule. This offers surgeons the ease of localization through direct indocyanine green fluorescence imaging, and it can be used as an effective alternative to other placement methods of locating pulmonary nodules.

Application value of CT-guided localization using a coil in combination with medical adhesive in sublobar resection.

To explore the application value of CT-guided localization using a coil in combination with medical adhesive in sublobar resection. The clinical data of 90 patients who had small pulmonary nodules and received thoracoscopic sublobar resection during the period from September 2021 to October 2022 in the Department of Thoracic Surgery, Juxian People's Hospital, Shandong Province, were retrospectively analyzed. The diameters of 95 pulmonary nodules in the 90 patients in the whole group ranged from 0.40 to 1.24cm, and their distances from the visceral pleura ranged from 0.51 to 2.15cm. In these patients, percutaneous lung puncture was successfully performed under local anesthesia, through which coils were implanted in the nodules and medical adhesive was injected around the nodules, with a success rate of localization of 100%. Localization complications included 10 cases of asymptomatic pneumothorax, 9 cases of intrapulmonary hemorrhage, 5 cases of severe pain, and 1 case of pleural reaction, all of which required no special treatment. After preoperative localization, the success rate of resection of pulmonary nodules was 100%, and sufficient surgical margins were obtained. CT-guided localization using a coil in combination with medical adhesive is a safe, effective, and simple localization method that can meet the requirements of thoracic surgeons for intraoperative localization; for small pulmonary nodules, especially those small-sized and deep-located ground-glass nodules containing few solid mass, this method has important clinical application value, which is a preoperative localization technique worthy of wide application in clinical practice.

THE OROANTRAL FISTULA: A CASE REPORT

Introduction: An unnatural communication between the maxillary sinus and oral cavity is known as “oroantral communication”(OAC) and if it does not close spontaneously, it is epithelialized so that oroantral fistula develops.(2) The most common cause of oroantral fistula is the extraction of a maxillary molar or premolar.(2,11) The close relationship between the apex of these teeth and the thinness of the antral floor explains this.(11) From simple local methods like buccal advancement flap to complex distal flaps and grafts, various methods have been described in the literature for the closure of these communication.(2) To facilitate gravitational drainage and aeration via an inferior meatal antrostomy and to remove irreversibly damaged mucosa of the maxillary sinus, Caldwell Luc procedure was designed.(10) Objective: To describe a case report of oroantral fistula [OAF] and its closure. Case Report: We repot a case of 28 years old male patient who came to our attention for the presence of the OAF and presence of maxillary third molar root piece in the maxillary sinus. This patient was treated by“ OBTURATOR procedure.”

Computed tomography-guided simultaneous coil localization as a bridge to one-stage surgery for multiple lung nodules: a retrospective study

BackgroundVideo-assisted thoracoscopic surgery (VATS) has been widely used for diagnostic wedge resection of lung nodules. When VATS is performed for multiple lung nodules, preoperative localization for each target nodule is required. In this study, we evaluated the clinical effectiveness of computed tomography (CT)-guided simultaneous coil localization in one-stage VATS wedge resection for multiple lung nodules.MethodsBetween November 2015 to March 2018, 19 patients with multiple target nodules underwent CT-guided simultaneous coil localization and one-stage VATS resection at our center. Data on the technical success of simultaneous localization and wedge resection, complications, and pathological results were collected.ResultsA total of 43 nodules were localized. The localization was successfully achieved in 42 of 43 nodules (97.7%). The technique of simultaneous localization was successfully achieved in 18 of 19 patients (94.7%). Fifteen patients underwent unilateral lung localization and four patients underwent bilateral lung localization. Three patients (15.8%) experienced asymptomatic pneumothorax after localization. All patients successfully underwent one-stage wedge resection for all target nodules. The mean duration of one-stage VATS procedure was 171.8 ± 84.0 min. The mean volume of blood loss was 94.2 ± 58.0 mL. Three patients experienced pleural effusion after VATS. During a follow-up of 6–31 months (median 18 months), no patient developed new lung nodules or distant metastasis.ConclusionsPreoperative simultaneous coil implantation is a safe and simple method for localization of multiple lung nodules. Simultaneous coil localization could effectively guide a one-stage VATS diagnostic wedge resection procedure.

Optimization of Plate Heat Exchangers with Intermittent Ridges

Research of devices for heat recovery is currently focused on increasing the temperature and heat efficiency of plate heat exchangers. The goal of optimization is not only to increase the heat transfer or even moisture but also reduce the pressure loss and possibly material costs. This study deals with a plate heat exchanger with wall shaped by intermittent ridges. We used software fluent and user defined deforming to deform computational mesh and create various heat exchange walls with different number of ridges and different number of set-offs. The intention of the set-offs is to discompose boundary layer inside channels created by ridges, mix the temperature field and thus intensify the heat transfer. We used previously formulated objective function, which is a linear combination of efficiency and pressure loss, and a simple local method to optimize the heat exchanger for required pressure loss. It was found that the objective function surface is monotone and unimodal, but is not smooth. The global optimums were identified and it was shown that the optimal wall shape has no set-off for low pressure losses. The optimal count of ridges and optimal count of set-offs rise with higher required pressure loss. It was proved that the suggested objective function is suitable for optimization of a counterflow plate heat exchanger, but use of a global optimization method would be beneficial.

Low-cost model selection for SVMs using local features

Many practical engineering applications require the usage of accurate automatic decision systems, usually operating under tight computational constraints. Support Vector Machines (SVMs) endowed with a Radial Basis Function (RBF) as kernel are broadly accepted as the current state of the art for decision problems, but require cross-validation to select the free parameters, which is computationally costly. In this work we investigate low-cost methods to select the spread parameter in SVMs with an RBF kernel. Our proposal relies on the use of simple local methods that gather information about the local structure of each dataset. Empirical results in UCI datasets show that the proposed methods can be used as a fast alternative to the standard cross-validation procedure, with the additional advantage of avoiding the (often heuristic) task of a priori fixing the values of the spread parameter to be explored.

Evaluation of different treatment modalities for closure of oro-antral communications and formulation of a rational approach

Oro-antral communication is a common occurrence following removal of maxillary premolars and molars because of anatomic proximity of root apices of these teeth and maxillary antrum. Various methods have been described in literature for closure of these communications which vary from simple local methods like buccal advancement flap to complex distal flaps and grafts. Out of these plethora of the treatment modalities available for the treatment of oro antral fistula, the most simple and commonly used ones are either the buccal flap or the buccal pad of fat. In our study we compared the results, advantages and disadvantages of using buccal advancement technique and buccal fat pad individually and also in combination. With this paper, we aim to shed light on the efficacy of buccal pad of fat and the buccal flap, either alone or together, for the closure of OAF of various regions. We also aim to provide a systematic and rational approach for repair of oro-antral communications.

A simple method for localization and shielding of organs in diverging radiation treatment beam.

The planning of radiotherapy may include localization of organs not readily seen on plain X-ray films. Covington and Buzzi (1972) have described a method based on scintigrams which does not take account of the divergence of the treatment beam. Other reported methods include ultrasound (Sanders et al., 1974) and computed tomography (Chernak et al., 1975). In irradiation of the spleen the standard method described by Johnson (1973) is not reliable due to the great variation in splenic position (Kreel and Mindel, 1969). There may be medical contraindications to the use of iodine contrast medium in defining the optimum shielding of kidneys. The localization of liver metastases, pancreas or other target volumes by radionuclide imaging may also be indicated in radiation therapy.

A marking method for stimulating electrode locations

A simple method for localization of stimulating locations in the central nervous system is described. The method utilizes radio frequency current to destroy the blood-brain barrier locally without coagulating the tissue and allows trypan blue to extravasate into the marking site from the intravascular compartment.

Simple Method of Localization of Occult Septal Defects

Simple Method of Localization of Occult Septal Defects

A Simple Method of Localization of Foreign Bodies

ArticlesA Simple Method of Localization of Foreign BodiesJ. S. YoungJ. S. YoungSt. Louis, Missouri, U.S.A.Search for more papers by this authorPublished Online:14 Feb 2014https://doi.org/10.1259/are.1917.0012SectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail About"A Simple Method of Localization of Foreign Bodies." Archives of Radiology and Electrotherapy, 22(2), pp. 40–41 Previous article Next article FiguresReferencesRelatedDetails Volume 22, Issue 2July 1917Pages: 33-64 Copyright © 1917, The British Institute of Radiology History Published onlineFebruary 14,2014 Metrics Download PDF