Effects of Neck Extension, Coverage, and Frequency on The Fretting Corrosion Of Modular THR Bore and Cone Interface

2009 ◽  
pp. 189-189-10 ◽  
Author(s):  
SA Brown ◽  
A Abera ◽  
M D'Onofrio ◽  
C Flemming
Keyword(s):  
Fretting Corrosion ◽  
Neck Extension

Le fretting-corrosion et les dégradations dues aux actions de contact

1976 ◽  
Vol 64 (11) ◽  
pp. 385-392
Author(s):  
M. Moreau ◽  
M. Gostoli
Keyword(s):  
Fretting Corrosion

Preventing Fretting Corrosion of Highly Stressed Airplane-Engine Components

2020 ◽  
Vol 40 (8) ◽  
pp. 696-699
Author(s):  
L. V. Denisov ◽  
A. G. Boitsov ◽  
M. V. Siluyanova ◽  
V. V. Kuritsyna
Keyword(s):  
Fretting Corrosion ◽  
Airplane Engine ◽  
Engine Components

scholarly journals A Retrospective Review of 589 Percutaneous Tracheostomies in a Canadian Community Teaching Hospital

2021 ◽  
pp. 014556132110257
Author(s):  
Dongho Shin ◽  
Andrew Ma ◽  
Yvonne Chan
Keyword(s):  
Retrospective Study ◽  
Teaching Hospital ◽  
Intraoperative Complications ◽  
Percutaneous Tracheostomy ◽  
Hospital Setting ◽  
Complication Rates ◽  
Safe Alternative ◽  
Neck Extension ◽  
Intraoperative Complication ◽  
Community Teaching

Objective: The primary objective of this study was to review the complication rate of percutaneous tracheostomies performed by a single surgeon in a community teaching hospital. Methods: This retrospective study reviewed the patients who underwent percutaneous tracheostomy with bronchoscopic guidance in a community hospital setting between 2009 and 2017. Patients older than the age of 18 requiring percutaneous tracheostomy were chosen for this retrospective study. Patients who were medically unstable, had no palpable neck landmarks, and inadequate neck extension were excluded. Indications for percutaneous tracheostomy included patients who had failed to wean from mechanical ventilation, required pulmonary toileting, or in whom airway protection was required. Results: Of the 600 patients who received percutaneous tracheostomy, 589 patients were included in the study. Intraoperative complication (2.6%) and postoperative complication rates (11.4%) compared similarly to literature reported rates. The most common intraoperative complications were bleeding, technical difficulties, and accidental extubation. Bleeding, tube obstruction, and infection were the most common postoperative complications. Overall burden of comorbidity, defined by Charlson Comorbidity Index, and coagulopathy were also found to be associated with higher complication rates. The decannulation rate at discharge was 46.3%. Conclusion: Percutaneous tracheostomy is a safe alternative to open tracheostomies in the community setting for appropriately selected patients.

scholarly journals Previously unknown behavior in parasitic cuckoo females: male-like vocalization during migratory activity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Swetlana G. Meshcheryagina ◽  
Alexey Opaev
Keyword(s):  
Vocal Communication ◽  
Harmonic Spectrum ◽  
Common Cuckoo ◽  
Neck Extension ◽  
Migratory Activity ◽  
Call Production ◽  
In Captivity ◽  
In The Wild ◽  
Combined Features ◽  
Female Call

Abstract Background In the last decade, enigmatic male-like cuckoo calls have been reported several times in East Asia. These calls exhibited a combination of vocal traits of both Oriental Cuckoo (Cuculus optatus) and Common Cuckoo (Cuculus canorus) advertising calls, and some authors therefore suggested that the enigmatic calls were produced by either Common × Oriental Cuckoo male hybrids or Common Cuckoo males having a gene mutation. However, the exact identity of calling birds are still unknown. Methods We recorded previously unknown male-like calls from three captive Oriental Cuckoo females, and compared these calls with enigmatic vocalizations recorded in the wild as well as with advertising vocalizations of Common and Oriental Cuckoo males. To achieve this, we measured calls automatically. Besides, we video-recorded captive female emitting male-like calls, and compared these recordings with the YouTube recordings of calling males of both Common and Oriental Cuckoos to get insight into the mechanism of call production. Results The analysis showed that female male-like calls recorded in captivity were similar to enigmatic calls recorded in the wild. Therefore, Oriental Cuckoo females might produce the latter calls. Two features of these female calls appeared to be unusual among birds. First, females produced male-like calls at the time of spring and autumn migratory activity and on migration in the wild. Because of this, functional significance of this call remained puzzling. Secondly, the male-like female call unexpectedly combined features of both closed-mouth (closed beak and simultaneous inflation of the ‘throat sac’) and open-mouth (prominent harmonic spectrum and the maximum neck extension observed at the beginning of a sound) vocal behaviors. Conclusions The Cuculus vocalizations outside the reproductive season remain poorly understood. Here, we found for the first time that Oriental Cuckoo females can produce male-like calls in that time. Because of its rarity, this call might be an atavism. Indeed, female male-like vocalizations are still known in non-parasitic tropical and apparently more basal cuckoos only. Therefore, our findings may shed light on the evolution of vocal communication in avian brood parasites.

Comparison of the Bullard and Macintosh Laryngoscopes for Endotracheal Intubation of Patients with a Potential Cervical Spine Injury 

1997 ◽  
Vol 87 (6) ◽  
pp. 1335-1342 ◽  
Author(s):  
Andrew D. J. Watts ◽  
Adrian W. Gelb ◽  
David B. Bach ◽  
David M. Pelz
Keyword(s):  
Cervical Spine ◽  
General Anesthesia ◽  
Endotracheal Intubation ◽  
Cervical Spine Injury ◽  
Cricoid Pressure ◽  
Macintosh Laryngoscope ◽  
Spine Injury ◽  
Neck Extension ◽  
Bullard Laryngoscope ◽  
Spine Movement

Background In the emergency trauma situation, in-line stabilization (ILS) of the cervical spine is used to reduce head and neck extension during laryngoscopy. The Bullard laryngoscope may result in less cervical spine movement than the Macintosh laryngoscope. The aim of this study was to compare cervical spine extension (measured radiographically) and time to intubation with the Bullard and Macintosh laryngoscopes during a simulated emergency with cervical spine precautions taken. Methods Twenty-nine patients requiring general anesthesia and endotracheal intubation were studied. Patients were placed on a rigid board and anesthesia was induced. Laryngoscopy was performed on four occasions: with the Bullard and Macintosh laryngoscopes both with and without manual ILS. Cricoid pressure was applied with ILS. To determine cervical spine extension, radiographs were exposed before and during laryngoscopy. Times to intubation and grade view of the larynx were also compared. Results Cervical spine extension (occiput-C5) was greatest with the Macintosh laryngoscope (25.9 degrees +/- 2.8 degrees). Extension was reduced when using the Macintosh laryngoscope with ILS (12.9 +/- 2.1 degrees) and the Bullard laryngoscope without stabilization (12.6 +/- 1.8 degrees; P < 0.05). Times to intubation were similar for the Macintosh laryngoscope with ILS (20.3 +/- 12.8 s) and for the Bullard without ILS (25.6 +/- 10.4 s). Manual ILS with the Bullard laryngoscope results in further reduction in cervical spine extension (5.6 +/- 1.5 degrees) but prolongs time to intubation (40.3 +/- 19.5 s; P < 0.05). Conclusions Cervical spine extension and time to intubation are similar for the Macintosh laryngoscope with ILS and the Bullard laryngoscope without ILS. However, time to intubation is significantly prolonged when the Bullard laryngoscope is used in a simulated emergency with cervical spine precautions taken. This suggests that the Bullard laryngoscope may be a useful adjunct to intubation of patients with potential cervical spine injury when time to intubation is not critical.

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