Academic literature on the topic 'Tilt-up technique'
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Journal articles on the topic "Tilt-up technique"
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Ferreira, Thiago Penido Moreira, Mateus Martins Marcatti, Fabrício Melo Bertolini, Otaviano de Oliveira Junior, and Gustavo Araújo Nunes. "Arthroscopic Brostrom technique." Journal of the Foot & Ankle 14, no. 2 (August 30, 2020): 138–43. http://dx.doi.org/10.30795/jfootankle.2020.v14.1147.
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Objective: To present the clinical and functional results of surgical treatment of patients with chronic instability of the ankle using the arthroscopic Brostrom technique. Methods: This is a case series of patients who underwent surgical treatment for chronic instability of the lateral ligament of the ankle using the arthroscopic Brostrom technique. Clinical assessments of ankle stability were performed preoperatively and at the last follow-up using the American Orthopedic Foot and Ankle Score (AOFAS), a visual analog scale (VAS) for pain, and the anterior drawer and talar inversion tilt tests. Surgical complications and patient satisfaction ratings were also analyzed. Results: A total of 16 patients were analyzed, with a mean follow-up of 14 months. There was a statistically significant (p<0.001) improvement in mean AOFAS, which increased from 67.2 to 90.8 points and the mean VAS for pain score reduced from 6.5 to 1.5 points. All ankles were stable and had normal results for the anterior drawer test and the talar inversion tilt test. Three patients (19%) reported that resumption of sporting activities provoked subjective pain in the ankle, which improved progressively during follow-up. Two patients (12.5%) exhibited neurapraxia of the superficial peroneal nerve. A majority of the patients (81%) rated treatment as good or excellent. Conclusion: Treatment of chronic instability of the ankle ligament using the arthroscopic Brostrom technique restored ankle stability and achieved good clinical results. There was a high rate of early complications, but the majority were transitory and underwent complete remission during follow-up. Level of Evidence IV; Therapeutic Studies; Case Series.
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Eun, Sang Soo, Sang-Ho Lee, and H. Erken. "Transforaminal Percutaneous Endoscopic Lumbar Diskectomy for Downmigrated Disk Herniations: Lever-Up, Rotate, and Tilt Technique." Journal of Neurological Surgery Part A: Central European Neurosurgery 79, no. 02 (December 14, 2017): 163–68. http://dx.doi.org/10.1055/s-0037-1608837.
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Background and Study Aims Although transforaminal percutaneous endoscopic lumbar diskectomy (PELD) offers certain advantages in the treatment of disk herniations, it used to be limited to nonmigrated or low-migrated herniations. With improvements in endoscopic spinal surgery, the range of indications for PELD has expanded. Various techniques including transforaminal and interlaminar approaches for migrated disk herniations are described in the literature. This study describes a transforaminal PELD approach to address downmigrated intracanal soft disk herniations effectively using the lever-up, rotate, and tilt technique. Patients and Methods We performed a retrospective review of 18 patients who had been operated on with the described technique between October 2012 and December 2015. We assessed clinical outcomes using the visual analog scale (VAS) for back and leg pain and the Oswestry Disability Index (ODI) preoperatively at their respective clinical visits and postoperatively at the patients' final follow-up examinations. Results The mean preoperative VAS scores for back and leg pain were 3.75 + 1.34 (range: 2–6) and 8.3 + 0.6 (range: 8–10), respectively. The mean preoperative ODI was 67.3 + 15.3 (range: 48–90). The mean VAS scores for back and leg pain improved to 1.38 + 1.58 (range: 0–6) and 1.19 + 0.75 (range: 0–3), respectively, at the last follow-up. The mean ODI also improved to 14.1 + 6.2 (range: 8–30) at the last follow-up. All differences between the preoperative and last follow-up scores were statistically significant (p < 0.05), Two surgeries failed because of a remnant disk fragment. Conclusions The lever-up, rotate, and tilt technique for transforaminal PELD is an effective maneuver to treat downmigrated disk herniations in selected patients by experienced surgeons.
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Mukai, S., and J. Hayano. "Heart rate and blood pressure variabilities during graded head-up tilt." Journal of Applied Physiology 78, no. 1 (January 1, 1995): 212–16. http://dx.doi.org/10.1152/jappl.1995.78.1.212.
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We investigated the responses of the frequency components of heart rate (HR) and blood pressure (BP) variabilities to progressive changes in autonomic activity induced by the graded head-up tilt technique in 12 normal subjects (age 19–27 yr) under the condition of frequency-controlled respiration (0.25 Hz). During low-level tilt (0–30 degrees), the R-R interval was unchanged and the amplitude of the high-frequency (HF; 0.25 Hz) component of HR variability showed only a slight insignificant decrease. The amplitude of the low-frequency (LF; 0.04–0.15 Hz) component of HR variability increased progressively as the angle increased (P < 0.05). During high-level tilt (30–90 degrees), the R-R interval and the HF amplitude of HR variability decreased progressively with tilt angle (P < 0.001 for both). The LF amplitude of HR variability peaked at a tilt angle of 30 degrees. The LF-to-HF ratio of HR variability and the LF amplitude of systolic and diastolic BP variabilities increased progressively as the tilt angle increased from 0 to 60 degrees (P < 0.001), although systolic and diastolic BPs were unchanged. These results suggest that mixed autonomic responses to orthostatic stress, which are thought to be mediated by both cardiopulmonary and arterial baroreflex mechanisms, can be distinguished by changes in the frequency components of HR and BP variabilities.
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Afrin Rimi, Sadia, Iffat Rezwana, Shamima Sultana, and Sultana Ferdousi. "Gender differences in circulatory adjustment to head-up tilt test in health." Medical Science Pulse 14, no. 1 (June 23, 2020): 1–17. http://dx.doi.org/10.5604/01.3001.0014.2323.
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Background: A tilt table test is a useful, non-invasive technique that has been used for the last few decades to detect autonomic failure. The response to tilting may vary physiologically between sexes. Aim of the study: To assess the gender-specific changes in cardiovascular response to a tilt test in healthy subjects. Materials and Methods: This experimental study was conducted on 90 healthy males and females aged 18 - 60 years, from 2019 to 2020. Forty- five male subjects and 45 female subjects were included. Using a motorized tilt table, a tilt table test was performed at 60 degrees for 10 minutes. An automatic sphygmomanometer was used to measure blood pressure (BP), and heart rate (HR) and a pulse oximeter was used for the measurement of peripheral capillary oxygen saturation (SpO2). An independent sample t test, a multiple regression analysis and a chi squared test were conducted for statistical analyses. Results: A significantly greater drop in systolic blood pressure (SBP) was observed in females, compared to males after tilting. In 5.5% of the subjects, orthostatic intolerance occurred, but there were no significant age or gender- specific differences in subjects with orthostatic intolerance. Conclusion: This study concluded that in response to tilting, cardiovascular response was less pronounced in females.
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Laroia, Sandeep T., Justin J. Guan, Archana T. Laroia, Lucas Lenhart, and Antony J. Hayes. "A New Catheter Technique to Correct Severe IVC Filter Tilt during Placement." Journal of Clinical Interventional Radiology ISVIR 4, no. 01 (December 16, 2019): 27–30. http://dx.doi.org/10.1055/s-0039-3401346.
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Abstract Introduction Inferior vena cava (IVC) filter tilt is a common complication that occurs during and after filter placement. Severe tilting leads to reduced filter efficacy, lower retrieval success, and higher complication rates during retrieval. We present a novel catheter technique to correct severely tilted cone-shaped IVC filters without having to retrieve and replace the existing filter. Methods A retrospective review was performed for patients at our institution over three years who had severely tilted filters and underwent correction with the catheter technique. Indications for filter placement were categorized, and patient age, gender, tilt correction outcome, and complication rates were collected and analyzed. After severe tilting was noted on post-IVC filter deployment venogram, a Sos catheter was passed via the same femoral access site used for the filter placement. The catheter tip was reformed inside the cone of the filter and was used to push the filter tip back toward midline. Completion venogram was taken to document the amelioration of the tilt. Results Out of 28 patients who were found to have severely tilted filters on deployment and underwent correction with the catheter technique, 27/28 (96.4%) had successful correction. One (3.6%) had a minor complication where the filter struts became entangled with the catheter tip; however, simple maneuvering of the catheter and use of a stiff wire to straighten the catheter loop freed up the entanglement. No major complications occurred. Conclusion This technique is safe, effective, obviates filter replacement, and can be considered an additional management option for severe IVC filter tilt during placement.
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Musacchia, X. J., J. M. Steffen, and J. Dombrowski. "Rat cardiovascular responses to whole body suspension: head-down and non-head-down tilt." Journal of Applied Physiology 73, no. 4 (October 1, 1992): 1504–9. http://dx.doi.org/10.1152/jappl.1992.73.4.1504.
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The rat whole body suspension technique mimics responses seen during exposure to microgravity and was evaluated as a model for cardiovascular responses with two series of experiments. In one series, changes were monitored in chronically catheterized rats during 7 days of head-down tilt (HDT) or non-head-down tilt (N-HDT) and after several hours of recovery. Elevations of mean arterial (MAP), systolic, and diastolic pressures of approximately 20% (P < 0.05) in HDT rats began as early as day 1 and were maintained for the duration of suspension. Pulse pressures were relatively unaffected, but heart rates were elevated approximately 10%. During postsuspension (2–7 h), most cardiovascular parameters returned to presuspension levels. N-HDT rats exhibited elevations chiefly on days 3 and 7. In the second series, blood pressure was monitored in 1- and 3-day HDT and N-HDT rats to evaluate responses to rapid head-up tilt. MAP, systolic and diastolic pressures, and HR were elevated (P < 0.05) in HDT and N-HDT rats during head-up tilt after 1 day of suspension, while pulse pressures remained unchanged. HDT rats exhibited elevated pretilt MAP and failed to respond to rapid head-up tilt with further increase of MAP on day 3, indicating some degree of deconditioning. The whole body suspended rat may be useful as a model to better understand responses of rats exposed to microgravity.
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Piao, Lin Hua, Yan Jie Li, Bai Hua Li, Ming Ming Ji, and Xue Yan Zhang. "The Research of Micromachined Airflow Tilt Sensor." Advanced Materials Research 108-111 (May 2010): 682–85. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.682.
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Micromachine airflow tilt sensor which can be sensitive to tilt angle is described. Adopt micro-machined technique two deep groove are corroded on the silicon plate, and two cantilever beams of metal film heated hot wire is set up at each deep groove. Semicircle airtight space forms sense elements. Through Wheatstone bridge, we get the tilt output voltage. Single-chip computer and temperature sensor constitute compensation circuit to achieve temperature compensation and linear compensation. The test showed the sensor’s performance is as follow: measuring range is ±30,resolution<0.1°, working temperature is better than 50ms ,nonlinear<0.1%.The sensor is not only in small size but also in simply crafting. It is good in sensitive organ’s output consistency, and suitable for mass production.
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Menezes, Cristiano Magalhães, Leonardo Fernandes Aguiar, André de Oliveira Arruda, Rodrigo Vieira Cardoso, Germano Senna Oliveira do Valle, Rodrigo Souza Lima, Mário Leite Bringel, Felipe Miranda Mendonça Fernandes, and Joint Halley Guimbard Pérez. "IMPACT OF THE MIS-TLIF TECHNIQUE ON THE SPINOPELVIC PARAMETERS OF PATIENTS WITH LUMBAR ARTHRODESIS." Coluna/Columna 18, no. 1 (March 2019): 47–50. http://dx.doi.org/10.1590/s1808-185120191801188450.
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ABSTRACT Objective: To evaluate the influence of the MIS-TLIF technique on the spinopelvic parameters of patients submitted to lumbar arthrodesis up to three levels for the treatment of vertebral degenerative conditions without deformity. Methods: Retrospective radiographic evaluation of 52 patients submitted to the surgical treatment of lumbar arthrodesis using the MIS-TLIF technique in up to three levels. The spinopelvic parameters – pelvic incidence (PI), pelvic tilt(PT), lumbar lordosis (LL), segmental lordosis (Lseg), and the difference between lumbar lordosis and pelvic incidence (LL-PI mismatch) were analyzed in orthostatic lateral radiographs in the pre- and postoperative periods, with a minimum follow-up of 1 year. The patients were divided into three groups: PI <45°, PI between 45° and 55° and PI >55°. Results: Sixty-nine operated levels were evaluated in 15 patients with PI <45°, 19 with PI between 45° and 55° and 18 with PI >55°. The mean value of the pelvic incidence was 52.3° (± 11.5), lumbar lordosis 46.1° (pre)/45.6° (post); segmental lordosis 20.3° (pre)/20.6° (post); pelvic tilt 18.5° (pre)/18.2° (post); “mismatch” (PI-LL) 7° (pre)/ 6.6° (post), with no statistical difference among all parameters (p>0.05). Conclusions: The MIS-TLIF technique had no influence on postoperative spinopelvic parameters of patients undergoing lumbar arthrodesis surgery. Level of evidence: III. Retrospective comparative study.
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Soto, Gabriel E., Stephen J. Young, Maryann E. Martone, Thomas J. Deerinck, Stephan Lamont, Bridget O. Carragher, and Mark H. Ellisman. "Tomographic methods for detailed examination of large structures in the nervous system." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 96–97. http://dx.doi.org/10.1017/s0424820100146321.
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One of the limitations of electron microscopy has been the requirement for very thin samples to allow penetration of the electron beam. It is often the case that structures of interest are not contained within a single thin section. In these cases, serial sectioning techniques are required to reconstruct the object in its entirety. The use of higher voltage electron microscopes has allowed researchers to examine specimens up to fifty times thicker than those suitable for a conventional TEM. However, images from thick sections are often difficult to interpret as the electron micrograph is essentially a projection of the overlapping material within the section. The method of computerized axial tilt electron microscopic tomography offers the potential to visualize and analyze information contained in a thick section by deriving a three dimensional volume from a series of projections acquired by collecting images of the specimen at successive tilt increments about the Y axis. Unfortunately there are practical limitations to the resolution that can be obtained using this technique with very thick sections. Resolution of the tomogram increases with finer tilt sampling and an increased range of tilts but decreases with section thickness.
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Hayano, J., J. A. Taylor, A. Yamada, S. Mukai, R. Hori, T. Asakawa, K. Yokoyama, Y. Watanabe, K. Takata, and T. Fujinami. "Continuous assessment of hemodynamic control by complex demodulation of cardiovascular variability." American Journal of Physiology-Heart and Circulatory Physiology 264, no. 4 (April 1, 1993): H1229—H1238. http://dx.doi.org/10.1152/ajpheart.1993.264.4.h1229.
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Usefulness of complex demodulation (CDM) in assessing the frequency components of cardiovascular variability was assessed and, subsequently, this technique was utilized to determine the time-dependent responses of the low-frequency (LF) and high-frequency (HF) amplitudes of heart rate and blood pressure variabilities during postural tilt. CDM provides the time-dependent changes in amplitude of a particular frequency component on a continuous basis. Analysis of simulated data showed that CDM has sufficient frequency resolution to separately measure LF and HF amplitudes with a time resolution < 15 s and that CDM is robust to alterations in the frequency of the components. Analysis of actual data during postural tilt test in 23 young healthy subjects demonstrated that the HF amplitude of heart rate, an index of cardiac parasympathetic tone, rapidly decayed with head-up tilt (P < 0.01) and increased quickly showing an overshoot with tilt back to the supine position (P < 0.01). The LF amplitude of blood pressure, an index of vasomotor sympathetic activity, showed marked rhythmic fluctuation at an interval of 48-100 s during head-up tilt (P < 0.01), synchronizing with similar fluctuation in the LF amplitude of heart rate (P < 0.01). These results suggest that CDM can be used to provide a continuous assessment of cardiovascular variability components and that the dynamic responses of autonomic circulatory control to upright posture result in a phasic modulation of LF amplitude.
Books on the topic "Tilt-up technique"
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Lake, Douglas William, ed. Site perspectives. New York: Van Nostrand Reinhold, 1986.
Find full textBook chapters on the topic "Tilt-up technique"
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Brown, Kathryn. "Freelance Writing." In A Field Guide for Science Writers. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780195174991.003.0017.
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Living on the outskirts of Washington, D.C., I often encounter that classic cocktail party question, “And what do you do?” When I say I'm a freelance writer, people tend to respond in one of two ways. Some lean forward, suck in their breath, and marvel at how romantic and free my days must be. Others cluck, tilt their heads, and mutter that life must sure get bleak, scratching out a living on words. The truth lies somewhere between. Among freelancing's perks, flexibility ranks high. I might write about bio-defense one day and mental health the next. I might work in the library, on the porch—or, yes, in my gym clothes. My time is my own. The price for this luxury? Responsibility. Freelances are entrepreneurs. It's our job to find work, negotiate that work, and handle all the business details, from taxes, insurance, and retirement accounts to business cards and printer paper. If you're starting—or nurturing—a freelance science writing career, here are some practical tips to consider along the way. From cloning and stem cells to space exploration, food, and the environment, the visibility of science in society is strong. That's good news for freelances. Don't limit yourself to a handful of poorly paying publications, when you might be growing and learning (not to mention earning a better living) by diversifying. Today's successful freelances often go beyond writing straight magazine articles to writing trade books or projects for nonprofits, Web Sites, corporations, government agencies, and public relations agencies. As you diversify, hunt for one or more anchor clients—those who will hire you repeatedly. Also, consider following the tried-and-true technique of trading up. If you need experience, there's nothing wrong with freelancing for a city paper or tiny nonprofit (not big money-makers). Afterward, you can build on that experience—returning to those clients, while also using your clips to pitch other, bigger projects elsewhere. Diversifying doesn't mean you have to write everything. What if you have a passion for one field, in particular—say, physics? Just as staff writers cover a beat, some freelances feel most comfortable specializing in something they can learn top to bottom.
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Haddas, R., S. Kisinde, D. Mar, and I. Lieberman. "Does improved radiographic alignment truly enhance dynamic functional balance?" In Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210433.
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Prospective, concurrent-cohort study. To establish the relationship between radiographic alignment parameters and functional CoE measurements at one week before and at three months after realignment surgery in ADS patients. Adult degenerative scoliosis (ADS) represents a significant healthcare burden with exceedingly high and increasing prevalence, particularly among the elderly. Radiographic alignment measures and patient-reported outcomes currently serve as the standard means to assess spinal alignment, deformity, and stability. Neurological examinations have served as qualitative measures for indicating muscle strength, motor deficits, and gait abnormalities. Three-Dimensional motion analysis is increasingly being used to identify and measure gait and balance instability. Recently, techniques have been established to quantify balance characteristics described by Dubousset as the “cone of economy” (CoE). The relationship between radiographic alignment parameters and CoE balance measures of ADS patients before and after realignment surgery is currently unknown. 29 ADS patients treated with realignment surgery. Patients were evaluated at one week before realignment surgery and at their three-month follow-up examination. During each evaluation, patients completed self-reported outcomes (visual analog scales for pain, Oswestry Disability Index, SRS22r) and a functional balance test. Mean changes in dependent measures from before to after surgery were compared using paired t-tests. Pearson correlations were used to test for significant correlations between changes in radiographic and CoE measures. Significant improvements were found for all patient-reported outcomes, in several radiographic measures, and in CoE measures. Improvements of scoliosis Cobb angle, coronal pelvic tilt, lumbar lordosis, and thoracic kyphosis showed significant correlations with CoE sway and total distance measures at both the center of mass and center of the head. Improved radiographic alignment measures significantly correlated with improved CoE balance measures among ADS patients treated with realignment surgery at their three-month follow-up. These findings indicate that functional balance evaluations when used in conjunction with radiographic measurements, may provide a more robust and improved patient-specific sensitivity for postoperative assessments. CoE balance may represent a new measure of added value for surgical intervention of ADS.
Conference papers on the topic "Tilt-up technique"
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Sridhar, Siddharth, Rumit Kumar, Kelly Cohen, and Manish Kumar. "Fault Tolerance of a Reconfigurable Tilt-Rotor Quadcopter Using Sliding Mode Control." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9199.
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Tilt-rotor quadcopters are a novel class of quadcopters with a servo motor attached on each arm that assist the quadcopter’s rotors to tilt to a desired angle thereby enabling thrust vectoring. Using these additional tilt angles, this type of a quadcopter can be used to achieve desired trajectories with faster maneuvering and can handle external disturbances better than a conventional quadcopter. In this paper, a non-linear controller has been designed using sliding mode technique for the pitch, roll, yaw motions and the servo motor tilt angles of the quadcopter. The dynamic model of the tilt-rotor quadcopter is presented, based on which sliding surfaces were designed to minimize the tracking errors. Using the control inputs derived from these sliding surfaces, the state variables converge to their desired values in finite-time. Further, the non-linear sliding surface coefficients are obtained by stability analysis. The robustness of this proposed sliding mode control technique is shown when a faulty motor scenario is introduced. The quadcopter transforms into a T-copter design upon motor failure thereby abetting the UAV to cope up with the instabilities experienced in yaw, pitch and roll axes and still completing the flight mission. The dynamics of the T-copter design and the derivation of the switching surface coefficients for this reconfigurable system are also presented.
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De Maria, Beatrice, Vlasta Bari, Giovanni Ranuzzi, Laura Dalla Vecchia, Sergio Cerutti, and Alberto Porta. "Comparison between Cardiac Baroreflex Sensitivity Estimates Derived from Sequence and Phase Rectified Signal Averaging Techniques During Head-up Tilt." In 2017 Computing in Cardiology Conference. Computing in Cardiology, 2017. http://dx.doi.org/10.22489/cinc.2017.001-169.
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Camerini, Claudio, Miguel Freitas, Ricardo Artigas Langer, Jean Pierre von der Weid, and Robson Marnet. "Autonomous Underwater Riser Inspection Tool." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31485.
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The inspection of the vertical section of an offshore pipeline, known as the riser, plays a critical part of any integrity management program. This section connects the pipe that runs on the seabed to the production facility, be it a floating platform or a FPSO. Hanging from the platform over deep waters, risers are subject to very extreme operating conditions such as high loads and underwater currents. Corrosion, fatigue, abrasion and damages caused by stray object collisions are factors that must be taken into account, so that oil and gas production are not compromised. A flexible pipeline, a well engineered solution used in most riser installations, provides high reliability while requiring little maintenance but, in spite of advances in project and installation, the inspection of riser pipelines is an immature field where technology has not yet met the user’s demands. In the search for better riser inspection techniques, a project was started to design a new inspection tool. The basic concept consists of an autonomous vehicle, the Autonomous Underwater Riser Inspection tool (AURI), that uses the riser itself for guidance. The AURI tool can control its own velocity and is suited to carry different types of inspection devices. The first AURI prototype is designed to perform visual inspection with an built-in camera system, covering 100% of the external riser surface. The AURI can reach water depths up to a thousand meters. It was built with several embedded security mechanisms to ensure tool recovery in case of failure and also to minimize chances of damage to the pipeline or other equipment. It uses two electrical thrusters to push it along the riser. The mission is set to a maximum depth to be inspected and is considered complete when one of the following conditions is met: (1) maximum pressure on depth sensor is reached or (2) the length of the run is achieved or (3) maximum mission duration is exceeded or (4) maximum allowed tilt is detected by the inclinometer. Thanks to its positive buoyancy, the AURI will always return to the surface even if the electronics fail or the batteries get exhausted. This paper presents the first AURI prototype as well as the preliminary test results.