The Experts below are selected from a list of 58965 Experts worldwide ranked by ideXlab platform
Connor J. Telles - One of the best experts on this subject based on the ideXlab platform.
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Neck Motion Due to the Halo-Vest in Prone and Supine Positions
Spine, 2010Co-Authors: Paul C. Ivancic, Connor J. TellesAbstract:Snaking motion of the neck is defined as rotation in opposing directions throughout the cervical spine. Previous clinical studies have suggested snaking neck motion due to the halo-Vest may lead to inadequate healing or nonunion. The objectives of this study were to evaluate motion of the injured cervical spine with normal halo-Vest application and Vest loose in the prone and supine positions. The halo-Vest was applied to a Human Model of the Neck, which consisted of a cervical spine specimen mounted to the torso of an anthropometric test dummy and carrying a surrogate head. The model was transitioned from prone, to upright, to supine with the halo-Vest applied normally and with the Vest loose. Average peak spinal motions were computed in the prone and supine positions and contrasted with the physiologic rotation range, obtained from the intact flexibility test, and statistically compared (P
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Neck motion due to the halo-Vest in prone and supine positions.
Spine, 2010Co-Authors: Paul C. Ivancic, Connor J. TellesAbstract:An in vitro biomechanical study of the effectiveness of halo-Vest fixation. The objective was to evaluate motion of the injured cervical spine with normal halo-Vest application and Vest loose in the prone and supine positions. Snaking motion of the neck is defined as rotation in opposing directions throughout the cervical spine. Previous clinical studies have suggested snaking neck motion due to the halo-Vest may lead to inadequate healing or nonunion. The halo-Vest was applied to a Human Model of the Neck, which consisted of a cervical spine specimen mounted to the torso of an anthropometric test dummy and carrying a surrogate head. The model was transitioned from prone, to upright, to supine with the halo-Vest applied normally and with the Vest loose. Average peak spinal motions were computed in the prone and supine positions and contrasted with the physiologic rotation range, obtained from the intact flexibility test, and statistically compared (P < 0.05) between normal halo-Vest application and Vest loose. Snaking motion of the neck was observed in the prone and supine positions, consisting of extension at head/C1 and C1/2 and flexion at the inferior spinal levels. The intervertebral rotation peaks generally exceeded the physiologic range throughout the cervical spine due to the loose Vest in the prone position. Significant increases in the extension peaks at head/C1 (16.9 degrees vs. 5.7 degrees) and flexion peaks at C4/5 (6.9 degrees vs. 3.6 degrees) and C7-T1 (5.2 degrees vs. 0.7 degrees) were observed in the prone position due to the loose Vest, as compared to normal halo-Vest application. Axial neck separation was consistently observed in the prone and supine positions. The present results, which document snaking motion of the cervical spine due to the halo-Vest, indicate that an inadequately fitting or loose Vest may significantly diminish its immobilization capacity leading to delayed healing or nonunion.
Paul C. Ivancic - One of the best experts on this subject based on the ideXlab platform.
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Neck Motion Due to the Halo-Vest in Prone and Supine Positions
Spine, 2010Co-Authors: Paul C. Ivancic, Connor J. TellesAbstract:Snaking motion of the neck is defined as rotation in opposing directions throughout the cervical spine. Previous clinical studies have suggested snaking neck motion due to the halo-Vest may lead to inadequate healing or nonunion. The objectives of this study were to evaluate motion of the injured cervical spine with normal halo-Vest application and Vest loose in the prone and supine positions. The halo-Vest was applied to a Human Model of the Neck, which consisted of a cervical spine specimen mounted to the torso of an anthropometric test dummy and carrying a surrogate head. The model was transitioned from prone, to upright, to supine with the halo-Vest applied normally and with the Vest loose. Average peak spinal motions were computed in the prone and supine positions and contrasted with the physiologic rotation range, obtained from the intact flexibility test, and statistically compared (P
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Neck motion due to the halo-Vest in prone and supine positions.
Spine, 2010Co-Authors: Paul C. Ivancic, Connor J. TellesAbstract:An in vitro biomechanical study of the effectiveness of halo-Vest fixation. The objective was to evaluate motion of the injured cervical spine with normal halo-Vest application and Vest loose in the prone and supine positions. Snaking motion of the neck is defined as rotation in opposing directions throughout the cervical spine. Previous clinical studies have suggested snaking neck motion due to the halo-Vest may lead to inadequate healing or nonunion. The halo-Vest was applied to a Human Model of the Neck, which consisted of a cervical spine specimen mounted to the torso of an anthropometric test dummy and carrying a surrogate head. The model was transitioned from prone, to upright, to supine with the halo-Vest applied normally and with the Vest loose. Average peak spinal motions were computed in the prone and supine positions and contrasted with the physiologic rotation range, obtained from the intact flexibility test, and statistically compared (P < 0.05) between normal halo-Vest application and Vest loose. Snaking motion of the neck was observed in the prone and supine positions, consisting of extension at head/C1 and C1/2 and flexion at the inferior spinal levels. The intervertebral rotation peaks generally exceeded the physiologic range throughout the cervical spine due to the loose Vest in the prone position. Significant increases in the extension peaks at head/C1 (16.9 degrees vs. 5.7 degrees) and flexion peaks at C4/5 (6.9 degrees vs. 3.6 degrees) and C7-T1 (5.2 degrees vs. 0.7 degrees) were observed in the prone position due to the loose Vest, as compared to normal halo-Vest application. Axial neck separation was consistently observed in the prone and supine positions. The present results, which document snaking motion of the cervical spine due to the halo-Vest, indicate that an inadequately fitting or loose Vest may significantly diminish its immobilization capacity leading to delayed healing or nonunion.
Eric Hand - One of the best experts on this subject based on the ideXlab platform.
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Space-science hopes rest on rocket test
Nature, 2010Co-Authors: Eric HandAbstract:New launch vehicle could carry next generation of NASA's research probes.
Laurent Brochard - One of the best experts on this subject based on the ideXlab platform.
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in vivo calibration of esophageal pressure in the mechanically ventilated patient makes measurements reliable
Critical Care, 2016Co-Authors: Francesco Mojoli, Giorgio Antonio Iotti, Francesca Torriglia, Marco Pozzi, Carlo Alberto Volta, Stefania Bianzina, Antonio Braschi, Laurent BrochardAbstract:Esophageal pressure (Pes) can provide information to guide mechanical ventilation in acute respiratory failure. However, both relative changes and absolute values of Pes can be affected by inappropriate filling of the esophageal balloon and by the elastance of the esophagus wall. We evaluated the feasibility and effectiveness of a calibration procedure consisting in optimization of balloon filling and subtraction of the pressure generated by the esophagus wall (Pew). An esophageal balloon was progressively filled in 36 patients under controlled mechanical ventilation. VBEST was the filling volume associated with the largest tidal increase of Pes. Esophageal wall elastance was quantified and Pew was computed at each filling volume. Different filling strategies were compared by performing a validation occlusion test. Fifty series of measurements were performed. VBEST was 3.5 ± 1.9 ml (range 0.5–6.0). Esophagus elastance was 1.1 ± 0.5 cmH2O/ml (0.3–3.1). Both Pew and the result of the occlusion test differed among filling strategies. At filling volumes of 0.5, VBEST and 4.0 ml respectively, Pew was 0.0 ± 0.1, 2.0 ± 1.9, and 3.0 ± 1.7 cmH2O (p < 0.0001), whereas the occlusion test was satisfactory in 22 %, 98 %, and 88 % of cases (p < 0.0001). Under mechanical ventilation, an increase of balloon filling above the conventionally recommended low volumes warrants complete transmission of Pes swings, but is associated with significant elevation of baseline. A simple calibration procedure allows finding the filling volume associated with the best transmission of tidal Pes change and subtracting the associated baseline artifact, thus making measurement of absolute values of Pes reliable.
Winfried Joch - One of the best experts on this subject based on the ideXlab platform.
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Effects of warm-up and precooling on endurance performance in the heat
British Journal of Sports Medicine, 2007Co-Authors: Sandra Uckert, Winfried JochAbstract:Objective: To examine the effects of different thermoregulatory preparation procedures (warm-up, precooling, control) on the endurance performance in the heat. Methods: Twenty male subjects completed three treadmill runs to exhaustion (5 days apart). In each session, all subjects performed an incremental running test either after warm-up (20 min at 70% HRmax), after precooling (wearing an ice cooling Vest [0 - 5°C] for 20 min at rest) or without particular preparation (control). After a 5-min break, the exercise protocol commenced at a workload of 9 km/h and was increased by 1 km/h every 5 min till the point of volitional fatigue. Running performance, heart rate, blood lactate concentration, tympanic temperature, and skin temperature were measured in each trial. Results: In the precooling condition, the running performance (32.5 (5.1) min) was significantly (p