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Search Results: 1 - 10 of 1277 matches for " position "
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Delayed Airway Obstruction in Posterior Fossa Craniotomy with Park-Bench Position—A Case Report and Review of the Literatures  [PDF]
Szu-Kai Hsu, Cheng-Ta Hsieh, Chih-Ta Huang, Jing-Shan Huang
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.311104
Abstract: Background: Park-bench position is a commonly used position in patients operated with cerebellopontine tumor, microvascular decompression, or lesions of cerebellar hemisphere and vertebral artery. Several complications associated with this positioning have been described. However, the delayed airway complication resulting from park-bench position has been rarely reported in the literatures. Herein, we report a rare case of delayed airway obstruction after a posterior-fossa craniotomy with park-bench position for acoustic neuroma. Case presentation: A 43-year-old woman, who has a right acoustic neuroma, was placed in the park-bench position for a posterior-fossa craniotomy. The anesthesia and operation were performed smoothly. However, progressive swelling in the left neck with extending to left face occurred two hours after endo-tracheal extubation. Computed tomographic scan of neck revealed diffuse swelling of the muscles and deep soft tissue in the left side. No obvious embolization of vascular system including jugular vein was found in the sonography. Because of obstruction in upper airway, orotracheal intubation and a head-up position were performed. The clinical symptoms improved gradually since the third post-operative day. She was discharged with obvious complications on the 23rd day after the operation. Conclusion: The possible mechanisms may originate from the kinking of the jugular vein due to hyper-flexed neck position during surgery. To prevent such complication, we must take great care of the anesthetized patients when placed in the forced neck position and always keep this rare but so critical complication in mind.
Design and Analysis of a Novel Surface Acoustic Wave Micro Position Sensor  [PDF]
Kai Yang, Zhigang Li, Liwei Shang, Weidong Yi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.311069
Abstract: In order to realize the micromation of position sensors, and extend the application area into micro scale, this paper designs a novel micro position sensor, Mace SAW (Surface Acoustic Wave) position sensor, which can be fabricated with MEMS technology. Its key components are IDTs (Interdigital Transducers) and reflective grooves. The structure and working principles of the sensor are introduced theoretically, and the manufacture process is then put forward.
Improvement of Position Accuracy with GAGAN and the Impact of Scintillation on GNSS  [PDF]
Surendra Sunda, B. M. Vyas, S. V. Satish, K. S. Parikh
Positioning (POS) , 2013, DOI: 10.4236/pos.2013.44028
Abstract:

GAGAN is an Indian implementation of Satellite Based Augmentation System (SBAS), developed jointly by Airports Authority of India (AAI) and Indian Space Research Organisation (ISRO). It is in final operational phase with all the required ground and space segments ready. With the availability of GAGAN signal-in-space (SIS), the improvement in position solution is investigated using the two collocated dual frequency GPS receivers. One of the receivers was configured as SBAS receiver and the other was kept as GPS stand-alone receiver. It is found that accuracy in position improved significantly in SBAS receiver due to GAGAN correction. The impact of scintillation on GNSS was also investigated in terms of position degradation and loss of lock of the satellite signals. The manyfold effects of scintillation on GPS and SBAS are discussed in detail. The results indicate ~15% reduction in number of measurements due to loss of lock during severe scintillation.

Cardiopulmonary Resuscitation in the Prone Position  [PDF]
Daiana de Souza Gomes, Carlos Darcy Alves Bersot
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.25045
Abstract: Cardiac arrest in unusual positions represents an additional challenge for anesthesiologists. This paper reports a successful cardiopulmonary resuscitation during neurosurgical procedure in which high-quality chest compressions was performed in the prone position. The aim of this report is disclose the knowledge of resuscitation maneuvers in a position other than supine. A 77-year-old female patient presented for excision of parietal-occipital meningioma in the prone position with the head fixed on a Mayfield head-holder. During the surgical procedure the sagittal sinus was disrupted. The patient presented an abrupt hemorrhagic shock leading to a cardiac arrest by hypovolemia despite vigorous volume replacement. Cardiac massage was promptly initiated in the prone position. After two minutes, there was a return of spontaneous circulation. The patient was discharged without sequelae. We concluded that high-quality chest compressions in the prone position were able to generate sufficient cardiac output.
Sitting position improves consciousness level in patients with cerebral disorders  [PDF]
Takashi Moriki, Takeshi Nakamura, Daisuke Kojima, Hiroyoshi Fujiwara, Fumihiro Tajima
Open Journal of Therapy and Rehabilitation (OJTR) , 2013, DOI: 10.4236/ojtr.2013.11001
Abstract: Cerebral disorders are often associated with disturbance of consciousness. Since the latter could alter the prognosis of physical function, early improvement of consciousness level is important. The present study tested the hypothesis that sitting position improves disturbances of consciousness in patients with cerebral disorders. The subjects were 17 patients with cerebral disorders and disturbances of consciousness. The consciousness level was evaluated in supine position and following a change to sitting position. The consciousness level was evaluated by the Glasgow Coma Scale (GCS). The total, eye opening, and motor GCS scores were significantly higher in the sitting position compared with the supine position. In conclusions, changing from supine to sitting position improves consciousness level in patients with cerebral disorders.
Operative Benefits of Artificial Pneumothorax in Thoracoscopic Esophagectomy in the Left Lateral Decubitus Position for Esophageal Cancer  [PDF]
Masashi Takemura, Nobuaki Kaibe, Mamiko Takii, Mitsuru Sasako
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.612127
Abstract: Objectives: This study aimed to evaluate operative benefits of artificial pnuemothorax in thoracoscopic esophagectomy in the left lateral decubitus position. Methods: We retrospectively analyzed short-term surgical outcomes including learning curve of 60 consecutive patients who underwent thoracoscopic esophagectomy with artificial pnuemothorax in the left lateral decubitus position between April 2010 and November 2012 in our department. Results: The median operation time and intraoperative blood loss were 443 min and 220 ml, respectively, and these values were 174 min and 95 ml, respectively, in the thoracic phase of surgery. The median number of harvested lymph node was 37. Only 1 patient required conversion to open esophagectomy. The postoperative 30-day mortality rate was 1.7%. The thoracic operation time significantly decreased after an experience of 10 cases and intraoperative blood loss during thoracic phasesignificantly decreased after an experience of 20 cases (p < 0.05), and operation time remained constant for the following cases. The number of harvested lymph nodes did not exhibit significant changes with an increase in the number of case experienced. Conclusions: Artificial pneumothorax provided the shorting of learning curve at the thoracoscopic esophagectomy in the left lateral decubitus position.
Paraplegia by Acute Cervical Disc Herniation after Shoulder Arthroscopic Surgery in Beach-Chair Position  [PDF]
Hye Young Kim, Gang Han Jung
Open Journal of Anesthesiology (OJAnes) , 2018, DOI: 10.4236/ojanes.2018.811028
Abstract: Paraplegia after non-cervical spine surgery under general anesthesia is a rare devastating postoperative complication [1]. A patient with shoulder pain was scheduled for shoulder arthroscopy due to rotator cuff repair. Arthroscopic shoulder surgery was performed with the patient in the beach-chair. Postoperatively, patients complained the weakness of both lower leg and marked numbness and tingling in the both arms. MRI showed a herniated intervertebral disc between C6 and C7 with spinal cord compression. Despite urgent discectomy, the patient remained dysesthesia of both upper extremities for 6 months. The purpose of this report is to introduce our case with a paraplegia observed after arthroscopic shoulder surgery in beach-chair position because of acute cervical herniation.
Network Position, Technological Distance and Firm’s Cooperation Innovation  [PDF]
Jiayu Chi, Ling Sun
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.811145
Abstract: This paper studied the joint effects of network position and technological distance on firm’s cooperation innovation based on the data of firm’s patent cooperation from 2003-2013 in the electronic information, electric power and equipment manufacturing industry. Results show that both network centrality and structure holes have a significant positive impact on the firm’s cooperation innovation output; technological distance and cooperative innovation performance have an inverted u-shaped relationship; the interaction of network centrality and technological distance negatively regulates the cooperative innovation performance; the interaction of technological distance and structure holes can promote cooperative innovation performance.
Comparación entre la posición de Valdivia y la posición prona en la nefrolitectomía percutánea (NLP)
Amón Sesmero,J.H.; Del Valle González,N.; Conde Redondo,C.; Rodriguez Toves,A.; Cepeda Delgado,M.; Martínez-Sagarra Oceja,J.M.;
Actas Urológicas Espa?olas , 2008, DOI: 10.4321/S0210-48062008000400007
Abstract: introduction: although the supine position created by dr. valdivia two decades ago to perform the procedure known as percutaneous nephrolitectomy (pnl) presents advantages against the prone position in some aspects concerning anesthesia and surgical ergonomy, its use has failed to spread widely among the urology community due to certain technical difficulties, a lower rate of calculi clearing and a higher rate of complications, in spite of the fact that the scarce comparative studies do not show enough data to support this opinion. the present study compares both positions considering the technical difficulties encountered, their effectiveness and their results and complications. material and methods: a series of 50 patients that underwent pcnl by prone position is compared retrospectively with another series of 54 patients that underwent consecutively pcnl by prone position. all procedures were performed under general anesthesia, the inferior calyx approach was the one used the most over the supracostal approach, and the sole tract over the multi-tract approach was predominant. dilatation of the nephrostomy tract was done, in most of the cases, with a high-pressure balloon catheter. the stone surface treated was 399.93±58.2 mm2 for the supine group, and 416.36±46.54 mm2 for the prone one (p=0.456). the management of the stones was carried out by ultrasonic or ballistic fragmentation, and a small group of patients underwent direct stone removal. results: as far as demographic parameters and operative variables such as number of tracts performed, calyx election, type of tract dilatation and kind of energy used for fragmentation, both groups were homogeneous. in 3 cases of each group there was a failure to access the kidney. the rate of failure was 6%, and 5.56%, for the supine and prone groups, respectively (p=0.716). average operating time was 74.55±25.54 and 91.82±24.82 minutes, respectively, p=0.123. a postoperative x-ray showed a stone-free rate of 76% for the su
Comparison of Clinical Problems in Thoracoscopic Esophagectomy between Prone Position with Pneumothorax Procedure and Lateral Position  [PDF]
Yoshihiro Kasagi,Ryu Okutani,Yukiko Komatsu,Yutaka Oda
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.33034
Abstract: Study Objective: We compared the effects of intraoperative body position on blood gas and fluid balance in patients undergoing a thoracoscopic esophagectomy as well as during operation and postoperative laboratory data. Design: Prospective study. Setting: Operating room and intensive care unit. Patients: ASA physical status 1 and 2 patients (n = 26), scheduled for elective thoracoscopic esophagectomy and immediate reconstruction under general anesthesia with one-lung ventilation were enrolled. Interventions: Patients were assigned to either the lateral (n = 16) or prone (n = 10) position groups based on the planned intraoperative body position. A pneumothorax procedure was concomitantly performed only in the prone position group. Measurements: Fluid balance, PaO2/FIO2 ratio (P/F ratio), and maximum PaCO2 during the operation and postoperative laboratory data were analyzed. Main Results: There were no significant differences between the groups for amount of blood loss, blood transfusion, fluid infusion, or urine output. The P/F ratio during one-lung ventilation was significantly higher in the prone than the lateral position group (379 ± 122 vs. 297 ± 67 mmHg, p = 0.017), as was maximum intraoperative PaCO2 (72.2 ± 15.6 vs. 48.3 ± 6.3 mmHg, p < 0.001). Conclusions: A thoracoscopic esophagectomy in the prone position performed concomitantly with a CO2 pneumothorax procedure resulted in a significantly better P/F ratio during one-lung ventilation as compared to the lateral position, indicating that the prone position is more advantageous for oxygenation.
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