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https://www.readbyqxmd.com/read/28989623/endor-characterization-of-an-iron-alkene-complex-provides-insight-into-a-corresponding-organometallic-intermediate-of-nitrogenase
#1
Masaki Horitani, Katarzyna Grubel, Sean F McWilliams, Bryan D Stubbert, Brandon Q Mercado, Ying Yu, Prabhuodeyara M Gurubasavaraj, Nicholas S Lees, Patrick L Holland, Brian M Hoffman
A bio-organometallic intermediate, denoted PA, was previously trapped during the reduction of propargyl alcohol to allyl alcohol (AA) by nitrogenase, and a similar one was trapped during acetylene reduction, representing foundational examples of alkene binding to a metal center in biology. ENDOR spectroscopy led to the conclusion that these intermediates have η(2) binding of the alkene, with the hydrogens on the terminal carbon structurally/magnetically equivalent and related by local mirror symmetry. However, our understanding of both the PA intermediate, and of the dependability of the ENDOR analysis on which this understanding was based, was constrained by the absence of reference iron-alkene complexes for EPR/ENDOR comparison...
September 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28943009/midterm-and-long-term-follow-up-in-competitive-athletes-undergoing-thoracic-outlet-decompression-for-neurogenic-thoracic-outlet-syndrome
#2
William Shutze, Brad Richardson, Ryan Shutze, Kimberly Tran, Allen Dao, Gerald O Ogola, Allan Young, Greg Pearl
BACKGROUND: Neurogenic thoracic outlet syndrome (NTOS) results from compression of the brachial plexus by the clavicle, first rib, and scalene muscles and may develop secondary to repetitive motion of the upper extremity. Athletes routinely perform repetitive motions, and sports requiring significant arm and shoulder use may put the participant at increased risk for NTOS. Competitive athletes who develop NTOS may require first rib resection and scalenectomy (FRRS) for symptomatic relief...
September 21, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28940670/deoxygenation-of-inspiratory-muscles-during-cycling-hyperpnoea-and-loaded-breathing-in-health-and-disease-a-systematic-review
#3
REVIEW
Takako Tanaka, Nada Basoudan, Luana T Melo, Lisa Wickerson, Laurent J Brochard, Ewan C Goligher, W Darlene Reid
Assessing inspiratory muscle deoxygenation and blood flow can provide insight into anaerobic stress, recruitment strategies and mechanisms of inspiratory muscle limitation. Therefore, this review aimed to synthesize measurements of inspiratory muscle oxyhaemoglobin (O2 Hb), deoxyhaemoglobin (HHb), blood volume and flow of the inspiratory muscles acquired via near-infrared spectroscopy (NIRS) during cycling, hyperpnoea and loaded breathing in healthy non-athletes, healthy athletes and patients with chronic obstructive pulmonary disease (COPD) or chronic heart failure (CHF)...
September 22, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28928918/arterial-thoracic-outlet-syndrome-secondary-to-hypertrophy-of-the-anterior-scalene-muscle
#4
Erion Qaja, Sara Honari, Robert Rhee
Thoracic outlet syndrome (TOS) was first introduced in literature by Peet et al. in 1956. Since then is has been studied extensively and subcategorized into at least four closely related syndrome. Neurogenic TOS due to the compression of brachial plexus, arterial TOS in cases of compression of the subclavian artery, venous TOS in cases of compression of the subclavian vein, and non-specific type of TOS. Neurogenic TOS is by far the most common consisting of 95% of the cases, followed by venous and lastly arterial...
August 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28890403/sex-differences-in-respiratory-muscle-activation-patterns-during-high-intensity-exercise-in-healthy-humans
#5
Reid A Mitchell, Michele R Schaeffer, Andrew H Ramsook, Sabrina S Wilkie, Jordan A Guenette
Although women experience greater ventilatory constraints and have a higher work of breathing during exercise, they are less susceptible to diaphragm fatigue compared to men. The mechanisms for diaphragmatic fatigue resistance in women is unknown but may be related to sex differences in respiratory muscle recruitment. Accordingly, the purpose of this study was to determine if electromyography (EMG) of the diaphragm (EMGdi) and extra-diaphragmatic inspiratory muscles differ between sexes during exercise. Forty subjects (21M:19F) completed a constant load cycling test at 85% of maximum work rate until exhaustion, while instrumented with an oesophageal electrode catheter to measure EMGdi and surface electrodes to measure EMG of the sternocleidomastoid (EMGscm) and scalene (EMGsca) muscles...
September 7, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28823081/neck-inspiratory-muscle-activation-patterns-during-well-controlled-inspiration
#6
Sohei Washino, Hiroaki Kanehisa, Yasuhide Yoshitake
PURPOSE: Surprisingly, the activation characteristics of the neck inspiratory muscles as a function of key inspiratory mechanical parameters have yet to be demonstrated experimentally under well-controlled conditions. This study aimed to elucidate the muscle activation patterns of the neck inspiratory muscles by strictly controlling flow rate and lung volume. METHODS: Thirteen healthy subjects matched their inspiratory flow rate at approximately 20-100% of peak flow rate (PFR) as steady as possible during inspiration...
August 19, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28735950/associations-between-clinical-diagnostic-criteria-and-pretreatment-patient-reported-outcomes-measures-in-a-prospective-observational-cohort-of-patients-with-neurogenic-thoracic-outlet-syndrome
#7
Joshua Balderman, Katherine Holzem, Beverly J Field, Michael M Bottros, Ahmmad A Abuirqeba, Chandu Vemuri, Robert W Thompson
OBJECTIVE: Neurogenic thoracic outlet syndrome (NTOS) is caused by dynamic compression of the brachial plexus at the level of the supraclavicular scalene triangle or the subcoracoid (pectoralis minor) space, or both. The purpose of this study was to characterize relationships between 14 clinical diagnostic criteria (CDC) and seven pretreatment patient-reported outcomes measures (PROMs) in a prospective cohort of patients with NTOS. METHODS: There were 183 new patient referrals between July 1 and December 31, 2015, with 150 (82%) meeting an established set of predefined CDC for NTOS...
August 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28716694/-isolated-long-thoracic-nerve-palsy-more-than-meets-the-eye
#8
Andrés A Maldonado, Scott L Zuckerman, B Matthew Howe, Michelle L Mauermann, Robert J Spinner
INTRODUCTION: Two main hypotheses have been proposed for the pathophysiology of long thoracic nerve (LTN) palsy: nerve compression and nerve inflammation. We hypothesized that critical reinterpretation of electrodiagnostic (EDX) studies and MRIs of patients with a diagnosis of non-traumatic isolated LTN palsy could provide insight into the pathophysiology and, potentially, the treatment. MATERIAL AND METHODS: A retrospective review was performed of all patients with a diagnosis of non-traumatic isolated LTN palsy and an EDX and brachial plexus or shoulder MRI studies performed at our institution...
September 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28678290/second-order-directed-positioning-of-nanoparticles-induced-by-the-main-terminal-meniscus-shape-in-irregular-template-cavities
#9
Mohamed Asbahi, Zhaogang Dong, FuKe Wang, Mohammad S M Saifullah, Joel K W Yang, Karen S L Chong
Directed self-assembly of nanoparticles using topographical templates has demonstrated great capabilities of ordering particles at their maximum packing fraction resulting from template confinement effects and free energy minimization. However, to self-assemble nanostructures at a lower packing fraction with a precise control over particle's positioning is challenging due to the high entropy of such a system. Here, by fabricating templates of irregular cavities together with appropriate choice of solvent, we demonstrate the positioning of 8 nm Au nanoparticles within individual cavities at a low filling factor...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28677632/ultrasonographic-diagnosis-of-thoracic-outlet-syndrome-secondary-to-brachial-plexus-piercing-variation
#10
Vanessa Leonhard, Gregory Caldwell, Mei Goh, Sean Reeder, Heather F Smith
Structural variations of the thoracic outlet create a unique risk for neurogenic thoracic outlet syndrome (nTOS) that is difficult to diagnose clinically. Common anatomical variations in brachial plexus (BP) branching were recently discovered in which portions of the proximal plexus pierce the anterior scalene. This results in possible impingement of BP nerves within the muscle belly and, therefore, predisposition for nTOS. We hypothesized that some cases of disputed nTOS result from these BP branching variants...
July 4, 2017: Diagnostics
https://www.readbyqxmd.com/read/28671972/diaphragm-a-mnemonic-to-describe-the-work-of-breathing-in-patients-with-respiratory-failure
#11
Aiman Tulaimat, William E Trick
BACKGROUND: The assessment of the work of breathing in the definitions of respiratory failure is vague and variable. OBJECTIVE: Identify a parsimonious set of signs to describe the work of breathing in hypoxemic, acutely ill patients. METHODS: We examined consecutive medical ICU patients receiving oxygen with a mask, non-invasive ventilation, or T-piece. A physician inspected each patient for 10 seconds, rated the level of respiratory distress, and then examined the patient for vital signs and 17 other physical signs...
2017: PloS One
https://www.readbyqxmd.com/read/28626314/effect-of-sleep-posture-on-neck-muscle-activity
#12
Won-Hwee Lee, Min-Seok Ko
[Purpose] This study investigated the effect of sleep posture on neck muscle activity. [Subjects and Methods] The study recruited 20 healthy subjects, who were positioned in three supine sleeping positions: both hands at sides, both hands on the chest, and dominant hand on the forehead. The activities of the scalene and upper trapezius muscles bilaterally were measured by surface electromyography. [Results] The upper trapezius and scalene muscle activity on the right side was significantly greater in the supine with dominant hand on the forehead position than in the other positions...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28626302/the-immediate-effect-of-diaphragm-taping-with-breathing-exercise-on-muscle-tone-and-stiffness-of-respiratory-muscles-and-spo2-in-stroke-patient
#13
Joong-San Wang, Kyun-Hee Cho, Shin-Jun Park
[Purpose] This study aimed to examine the immediate effects of diaphragm taping with breathing exercise on the tone and stiffness in the respiratory muscles of patient with stroke. [Subjects and Methods] A total of 28 subjects, 14 in the diaphragm taping with breathing exercise group and 14 in the breathing exercise group, were administered respective intervention methods. Subsequently, the muscle tone and stiffness in upper trapezius, scalene, external oblique abdominal and ractus abdominis muscle of both the respiratory muscles were measured...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28594857/noninvasive-assessment-of-respiratory-muscle-strength-and-activity-in-myotonic-dystrophy
#14
Morgana de Araújo Evangelista, Fernando Augusto Lavezzo Dias, Mário Emílio Teixeira Dourado Júnior, George Carlos do Nascimento, Antonio Sarmento, Lucien Peroni Gualdi, Andrea Aliverti, Vanessa Resqueti, Guilherme Augusto de Freitas Fregonezi
OBJECTIVE: To evaluate sensitivity/specificity of the maximum relaxation rate (MRR) of inspiratory muscles, amplitude of electromyographic activity of the sternocleidomastoid (SCM), scalene (SCA), parasternal (2ndIS) and rectus abdominis (RA) muscles; lung function and respiratory muscle strength in subjects with Myotonic dystrophy type 1 (DM1) compared with healthy subjects. DESIGN AND METHODS: Quasi-experimental observational study with control group. MRR of inspiratory muscles, lung function and amplitude of the electromyographic activity of SCM, SCA, 2ndIS and RA muscles during maximum inspiratory pressure (PImax), maximum expiratory pressure (PEmax) and sniff nasal inspiratory pressure (SNIP) tests were assessed in eighteen DM1 subjects and eleven healthy...
2017: PloS One
https://www.readbyqxmd.com/read/28460809/ultrasound-guided-interscalene-nerve-block-vs-procedural-sedation-by-propofol-and-fentanyl-for-anterior-shoulder-dislocations
#15
RANDOMIZED CONTROLLED TRIAL
Esmaeil Raeyat Doost, Mohammad Mehdi Heiran, Mitra Movahedi, Amirhossein Mirafzal
BACKGROUND: Few studies were performed to compare ultrasound guided brachial plexus block with procedural sedation for reduction of shoulder dislocations in the Emergency Department (ED). This study was done to provide further evidence regarding this comparison. METHODS: This was a randomized clinical trial performed on patients presenting with anterior shoulder dislocations to the emergency department of an academic level 2 trauma center. Exclusion criteria were any contraindications to the drugs used, any patient which may not be potentially assigned into both groups because of an underlying medical condition, presence of neurovascular compromise related to the dislocation, presence of concomitant fractures, and patient refusal to participate in the study...
October 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28448001/repeated-measurement-of-respiratory-muscle-activity-and-ventilation-in-mouse-models-of-neuromuscular-disease
#16
Victoria N Jensen, Shannon H Romer, Sarah M Turner, Steven A Crone
Accessory respiratory muscles help to maintain ventilation when diaphragm function is impaired. The following protocol describes a method for repeated measurements over weeks or months of accessory respiratory muscle activity while simultaneously measuring ventilation in a non-anesthetized, freely behaving mouse. The technique includes the surgical implantation of a radio transmitter and the insertion of electrode leads into the scalene and trapezius muscles to measure the electromyogram activity of these inspiratory muscles...
April 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28327294/reference-values-for-the-scalene-interval-width-during-varying-degrees-of-glenohumeral-abduction-using-ultrasonography
#17
Ross Mattox, Patrick J Battaglia, Aaron B Welk, Yumi Maeda, Daniel W Haun, Norman W Kettner
OBJECTIVE: The aim of this study was to establish reference values for the width of the interval between the anterior and middle scalene muscles using ultrasonography during varying degrees of glenohumeral joint (GH) abduction. Reliability and body mass index (BMI) data were also assessed. METHODS: Interscalene triangles of asymptomatic participants were scanned bilaterally in the transverse plane. Images were obtained at 0°, 90°, and 150° of GH abduction with the participant seated...
November 2016: Journal of Manipulative and Physiological Therapeutics
https://www.readbyqxmd.com/read/28321484/rhabdomyolysis-resulting-in-concurrent-horner-s-syndrome-and-brachial-plexopathy-a-case-report
#18
Susan C Lee, Christian Geannette, Scott W Wolfe, Joseph H Feinberg, Darryl B Sneag
This case report describes a 29-year-old male who presented with immediate onset of Horner's syndrome and ipsilateral brachial plexopathy after sleeping with his arm dangling outside a car window for 8 h. Outside workup and imaging revealed rhabdomyolysis of the left neck musculature. Subsequent electrodiagnostic testing and high-resolution brachial plexus magnetic resonance imaging at the authors' institution attributed the Horner's syndrome and concurrent brachial plexopathy to rhabdomyolysis of the longus colli and scalene musculature, which had compressed-and consequently scar tethered-the cervical sympathetic trunk and brachial plexus...
August 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28265158/effects-of-manipulation-of-the-thorax-and-intensity-of-the-pressure-biofeedback-unit-on-the-superficial-cervical-flexors-muscle-during-craniocervical-flexion-exercise
#19
Jin Mo Yang, Hyun-Gyu Cha, Myoung-Kwon Kim
[Purpose] This study examined the effects of manipulation of the thorax and the intensity of the pressure biofeedback unit on the superficial cervical flexors muscle during craniocervical flexion exercise. [Subjects and Methods] Thirty three subjects participated in the experiment. Thirty three healthy people without any orthopedic history were also selected. The subjects could monitor the pressure applied to cervical vertebra 3 of the craniocervical junction by markings on the pressure biofeedback unit. Craniocervical flexion exercise was performed for 20 seconds per pressure, and two minutes of rest was allowed after exercise to reduce muscle fatigue...
February 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28255085/effects-of-inspiratory-muscle-training-on-respiratory-muscle-electromyography-and-dyspnea-during-exercise-in-healthy-men
#20
Andrew H Ramsook, Yannick Molgat-Seon, Michele R Schaeffer, Sabrina S Wilkie, Pat G Camp, W Darlene Reid, Lee M Romer, Jordan A Guenette
Inspiratory muscle training (IMT) has consistently been shown to reduce exertional dyspnea in health and disease; however, the physiological mechanisms remain poorly understood. A growing body of literature suggests that dyspnea intensity can be explained largely by an awareness of increased neural respiratory drive, as measured indirectly using diaphragmatic electromyography (EMGdi). Accordingly, we sought to determine whether improvements in dyspnea following IMT can be explained by decreases in inspiratory muscle electromyography (EMG) activity...
May 1, 2017: Journal of Applied Physiology
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