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https://www.readbyqxmd.com/read/28210319/physiology-of-respiratory-disturbances-in-muscular-dystrophies
#1
Antonella Lo Mauro, Andrea Aliverti
: Muscular dystrophy is a group of inherited myopathies characterised by progressive skeletal muscle wasting, including of the respiratory muscles. Respiratory failure, i.e. when the respiratory system fails in its gas exchange functions, is a common feature in muscular dystrophy, being the main cause of death, and it is a consequence of lung failure, pump failure or a combination of the two. The former is due to recurrent aspiration, the latter to progressive weakness of respiratory muscles and an increase in the load against which they must contract...
December 2016: Breathe
https://www.readbyqxmd.com/read/28209740/quantitative-mri-volumetry-diffusivity-cerebrovascular-flow-and-cranial-hydrodynamics-during-head-down-tilt-and-hypercapnia-the-spacecot-study
#2
Larry Allen Kramer, Khader M Hasan, Ashot E Sargsyan, Karina Marshall-Goebel, Jörn Rittweger, Dorit Donoviel, Saki Higashi, Benson Mwangi, Darius A Gerlach, Eric M Bershad
PURPOSE: In order to improve the pathophysiologic understanding of visual changes observed in astronauts, we aimed to use quantitative MRI to measure anatomic and physiologic responses during a ground-based spaceflight analogue (head down tilt, HDT) combined with increased ambient carbon dioxide (CO2). METHODS: Six healthy, male subjects participated in the double-blinded, randomized cross-over design study with two conditions: 26.5 h of -12° HDT with ambient air and with 0...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28202896/effect-of-mild-hypercapnia-on-lung-oxygenation-in-sitting-position-during-shoulder-arthroscopy-under-general-anesthesia
#3
Hyun Jeong Kwak, Ji Yeon Lee, Jong Wha Lee, Hong Soon Kim, Ho Jin Hur, Ji Young Kim
BACKGROUND Mild hypercapnia is permitted during surgeries in sitting position under general anesthesia to maintain cerebral regional oxygen saturation (rSO2). However, since hypoventilation may cause gas exchange impairment, we evaluated effects of mild hypercapnia on lung oxygenation during shoulder arthroscopy in sitting position. MATERIAL AND METHODS Forty patients were randomly allocated to a normocapnia group (ETCO2 35 mmHg, n=20) or a hypercapnia group (45 mmHg, n=20). The mean arterial pressure (MAP), heart rate (HR), and rSO2 were measured 5 min after intubation in supine position (T0), and at 2, 4, 6, 8, 10, 20, 30, 40, 50, and 60 min of remaining in sitting position (T1-10)...
February 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28192113/a-randomised-clinical-trial-comparing-the-effects-of-antitussives-on-respiratory-centre-output-in-patients-with-chronic-cough
#4
Claudia Mannini, Federico Lavorini, Alessandro Zanasi, Federico Saibene, Luigi Lanata, Giovanni Fontana
BACKGROUND: Cough is produced by the same neuronal pool implicated in respiratory rhythm generation and antitussive drugs acting at the central level, such as the opioids, may depress ventilation. Levodropropizine is classified as a non-opioid, peripherally-acting antitussive drug acting at the level of airway sensory nerves. However, the lack of a central action by Levodropropizine remains to be fully established. We set out to compare the effects of Levodropropizine and the opioid antitussive agent Dihydrocodeine on the respiratory responses to a conventional CO2 re-breathing test in patients with chronic cough of any origin...
February 10, 2017: Chest
https://www.readbyqxmd.com/read/28190548/venovenous-versus-venoarterial-extracorporeal-membrane-oxygenation-for-adult-patients-with-acute-respiratory-distress-syndrome-requiring-precannulation-hemodynamic-support-a-review-of-the-elso-registry
#5
Zachary N Kon, Gregory J Bittle, Chetan Pasrija, Si M Pham, Michael A Mazzeffi, Daniel L Herr, Pablo G Sanchez, Bartley P Griffith
BACKGROUND: In addition to severe hypoxia and hypercapnia, acute respiratory distress syndrome (ARDS) can present with substantial hemodynamic compromise, requiring inotropic or vasopressor support or both. Either venovenous (VV) or venoarterial (VA) extracorporeal membrane oxygenation (ECMO) can be offered in this situation. However, a contemporary comparison of these two cannulation strategies has yet to be well described. METHODS: The Extracorporeal Life Support Organization Registry was reviewed for all cases of adult ARDS in patients that required inotropic agents or vasopressors or both before ECMO initiation (2009 to 2013)...
February 9, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28188852/the-k%C3%A3-lliker-fuse-nucleus-acts-as-a-timekeeper-for-late-expiratory-abdominal-activity
#6
Sarah E M Jenkin, William K Milsom, Daniel B Zoccal
While the transition from the inspiratory to the post-inspiratory (post-I) phase is dependent on the pons, little attention has been paid to understanding the role of the pontine respiratory nuclei, specifically the Kölliker-Fuse nucleus (KF), in transitioning from post-I to the late expiratory (late-E) activity seen with elevated respiratory drive. To elucidate this, we used the in situ working heart-brainstem preparation of juvenile male Holtzman rats and recorded from the vagus (cVN), phrenic (PN) and abdominal nerves (AbN) during baseline conditions and during chemoreflex activation [with potassium cyanide (KCN; n=13) or hypercapnia (8% CO2; n=10)] to recruit active expiration...
February 8, 2017: Neuroscience
https://www.readbyqxmd.com/read/28188041/chronic-obstructive-pulmonary-disease-and-atrial-fibrillation-an-unknown-relationship
#7
REVIEW
Christos A Goudis
Chronic obstructive pulmonary disease (COPD) is independently associated with atrial fibrillation (AF). Decreased oxygenation, hypercapnia, pulmonary hypertension, diastolic dysfunction, oxidative stress, inflammation, changes in atrial size by altered respiratory physiology, increased arrhythmogenicity from nonpulmonary vein foci commonly located in the right atrium, and respiratory drugs have been implicated in the pathogenesis of AF in COPD. The understanding of the relationship between COPD and AF is of particular importance, as the presence of the arrhythmia has significant impact on mortality, especially in COPD exacerbations...
February 7, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28181842/the-effects-of-hypercapnia-on-cortical-capillary-transit-time-heterogeneity-cth-in-anesthetized-mice
#8
Eugenio Gutiérrez-Jiménez, Hugo Angleys, Peter Mondrup Rasmussen, Irene Klærke Mikkelsen, Kim Mouridsen, Leif Østergaard
Capillary flow patterns are highly heterogeneous in the resting brain. During hyperemia, capillary transit-time heterogeneity (CTH) decreases, in proportion to blood's mean transit time (MTT) in passive, compliant microvascular networks. Previously, we found that functional activation reduces the CTH:MTT ratio, suggesting that additional homogenization takes place through active neurocapillary coupling mechanisms. Here, we examine changes in the CTH:MTT ratio during hypercapnic hyperemia in anesthetized mice (C57Bl/6NTac), expecting that homogenization is smaller than during functional hyperemia...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28181258/cardiac-diastolic-and-autonomic-dysfunction-are-aggravated-by-central-chemoreflex-activation-in-hfpef-rats
#9
Camilo Toledo, David C Andrade, Claudia Lucero, Alexis Arce-Alvarez, Hugo S Díaz, Valentín Aliaga, Harold D Schultz, Noah J Marcus, Mónica Manríquez, Marcelo Faúndez, Rodrigo Del Rio
Heart failure (HF) patients with preserved ejection fraction (HFpEF) display irregular breathing, sympatho-vagal imbalance, arrhythmias, and diastolic dysfunction. It has been shown that tonic activation of central and peripheral chemoreflex pathway plays a pivotal role in the pathophysiology of HF with reduced ejection fraction. In contrast, no studies to date have addressed chemoreflex function or its effect on cardiac function in HFpEF. Therefore, we tested whether peripheral and central chemoreflexes are hyperactive in HFpEF and if chemoreflex activation exacerbates cardiac dysfunction and autonomic imbalance...
February 8, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28177116/effects-of-acute-controlled-changes-in-end-tidal-carbon-dioxide-on-the-diameter-of-the-optic-nerve-sheath-a-transorbital-ultrasonographic-study-in-healthy-volunteers
#10
M Dinsmore, J S Han, J A Fisher, V W S Chan, L Venkatraghavan
Transorbital ultrasonographic measurement of the diameter of the optic nerve sheath is a non-invasive, bed-side examination for detecting raised intracranial pressure. However, the ability of the optic nerve sheath diameter to predict acute changes in intracranial pressures remains unknown. The aim of this study was to examine the dynamic changes of the optic nerve sheath diameter in response to mild fluctuations in cerebral blood volume induced by changes in end-tidal carbon dioxide. We studied 11 healthy volunteers...
February 8, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28159772/%C3%AE-tocopherol-transfer-protein-mediates-protective-hypercapnia-in-murine-ventilator-induced-lung-injury
#11
Gail Otulakowski, Doreen Engelberts, Hajime Arima, Hiroyuki Hirate, Hülya Bayir, Martin Post, Brian P Kavanagh
RATIONALE: Hypercapnia is common in mechanically ventilated patients. Experimentally, 'therapeutic hypercapnia' can protect, but it can also cause harm, depending on the mechanism of injury. Hypercapnia suppresses multiple signalling pathways. Previous investigations have examined mechanisms that were known a priori, but only a limited number of pathways, each suppressed by CO2, have been reported. OBJECTIVE: Because of the complexity and interdependence of processes in acute lung injury, this study sought to fill in knowledge gaps using an unbiased screen, aiming to identify a specifically upregulated pathway...
February 3, 2017: Thorax
https://www.readbyqxmd.com/read/28159689/investigation-of-the-confounding-effects-of-vasculature-and-metabolism-on-computational-anatomy-studies
#12
C L Tardif, C J Steele, L Lampe, P-L Bazin, P Ragert, A Villringer, C J Gauthier
Computational anatomy studies typically use T1-weighted magnetic resonance imaging contrast to look at local differences in cortical thickness or grey matter volume across time or subjects. This type of analysis is a powerful and non-invasive tool to probe anatomical changes associated with neurodevelopment, aging, disease or experience-induced plasticity. However, these comparisons could suffer from biases arising from vascular and metabolic subject- or time-dependent differences. Differences in blood flow and volume could be caused by vasodilation or differences in vascular density, and result in a larger signal contribution of the blood compartment within grey matter voxels...
February 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28155911/effects-of-nutritional-and-ambient-oxygen-condition-on-biofilm-formation-in-mycobacterium-avium-subsp-hominissuis-via-altered-glycolipid-expression
#13
Takahiro Totani, Yukiko Nishiuchi, Yoshitaka Tateishi, Yutaka Yoshida, Hiromi Kitanaka, Mamiko Niki, Yukihiro Kaneko, Sohkichi Matsumoto
Mycobacterium avium subsp. hominissuis (MAH) is the major causative agent of nontuberculous mycobacteriosis, the representative case of environment-related infectious diseases the incidence of which is increasing in industrialized countries. MAH is found in biofilm in drinking water distribution system and residential environments. We investigated the effect of gaseous and nutritional conditions, and the role of glycopeptidolipids (GPLs) on biofilm-like pellicle formation in MAH. Pellicle formation was observed under 5% oxygen in Middlebrook 7H9 broth containing 0...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28155294/pulmonary-gas-exchange-and-acid-base-status-during-immobilisation-of-black-rhinoceroses-i-diceros-bicornis-i-in-zimbabwe
#14
Åsa Fahlman, Anna Edner, Sandra Wenger, Chris Foggin, Görel Nyman
When immobilising wildlife, adverse side effects can include hypoxaemia, acidosis and hypertension. Pulmonary gas exchange and acid-base status were evaluated during immobilisation of 25 free-ranging and one boma-held black rhinoceros (Diceros bicornis) in Zimbabwe. The effect of different body positions on arterial oxygenation was evaluated. A combination of the following drugs was used: an opioid (etorphine or thiafentanil), azaperone and an a2 -adrenoceptor agonist (detomidine or xylazine). Respiratory and heart rates, rectal temperature and pulse oximetry-derived haemoglobin oxygen saturation were recorded...
December 2, 2016: Journal of the South African Veterinary Association
https://www.readbyqxmd.com/read/28153460/prognostic-value-of-nocturnal-hypoventilation-in-neuromuscular-patients
#15
David Orlikowski, Helene Prigent, Maria-Antonia Quera Salva, Nicholas Heming, Cendrine Chaffaut, Sylvie Chevret, Djillali Annane, Frederic Lofaso, Adam Ogna
In neuromuscular disease (NMD) patients, current guidelines recommend the initiation of home mechanical ventilation (HMV) in case of daytime hypercapnia or nocturnal desaturation as an indirect sign of hypoventilation. Transcutaneous capno-oximetry (TcCO2) enables the direct assessment of nocturnal hypercapnia; however the best cut-off value remains to be defined. We aimed to compare the prognostic value of several published definitions of nocturnal hypercapnia in a cohort of NMD patients. All consecutive TcCO2 recordings performed between 2010 and 2014 in unventilated adult NMD patients in a tertiary reference centre were retrospectively collected...
December 21, 2016: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28151080/capture-of-free-ranging-mule-deer-odocoileus-hemionus-with-a-combination-of-medetomidine-azaperone-and-alfaxalone
#16
Amélie Mathieu, Nigel Caulkett, Patrick M Stent, Helen M Schwantje
The combination of medetomidine, azaperone, and alfaxalone has been successfully used to anesthetize captive white-tailed deer ( Odocoileus virginianus ). This same combination was utilized to immobilize free-ranging female mule deer ( Odocoileus hemionus ; MD) in urban and nonurban environments (14 urban MD, 14 nonurban MD) in British Columbia, Canada. Physiologic data were collected to assess the safety and reliability of this drug combination under field conditions. Each deer received estimated dosages of 0...
February 2, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28141603/prevention-and-management-of-postoperative-delirium-in-elderly-patients-following-elective-spinal-surgery
#17
Alireza K Nazemi, Anirudh K Gowd, Jonathan J Carmouche, Stephen L Kates, Todd J Albert, Caleb J Behrend
STUDY DESIGN: This study is a systematic review. OBJECTIVE: Propose an evidence-based algorithm for prevention, diagnosis, and management of postoperative delirium in geriatric patients undergoing elective spine surgery. SUMMARY OF BACKGROUND DATA: Delirium is associated with longer stays after elective surgery, increased risk of readmission, and $6.9 billion annually in medical costs. Early diagnosis and treatment of delirium can reduce length of stay (LOS), in-hospital morbidity, and health care costs...
January 30, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28137973/a-critical-role-for-astrocytes-in-hypercapnic-vasodilation-in-brain
#18
C Howarth, B A Sutherland, H B Choi, C Martin, B L Lind, L Khennouf, J M LeDue, J M P Pakan, R W Ko, G C R Ellis-Davies, M J Lauritzen, N R Sibson, A M Buchan, B A MacVicar
: Cerebral blood flow (CBF) is controlled by arterial blood pressure, arterial CO2, arterial O2, and brain activity and is largely constant in the awake state. Although small changes in arterial CO2 are particularly potent to change CBF (1 mmHg variation in arterial CO2 changes CBF by 3-4%), the coupling mechanism is incompletely understood. We tested the hypothesis that astrocytic prostaglandin E2 (PgE2) plays a key role for cerebrovascular CO2 reactivity and that preserved synthesis of glutathione is essential for the full development of this response...
January 30, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28137487/inspiratory-muscle-training-during-rehabilitation-in-successfully-weaned-hypercapnic-patients-with-copd
#19
Dominic Dellweg, Karina Reissig, Ekkehard Hoehn, Karsten Siemon, Peter Haidl
BACKGROUND: This study is aimed to evaluate the effect of inspiratory muscle training (IMT) added to rehabilitation in patients with chronic obstructive pulmonary disease (COPD) who remain hypercapnic and use non-invasive ventilation after successful weaning. METHODS: Patients received rehabilitation and were randomized to inspiratory muscle or sham training for 4 weeks. The primary outcome was distance walked within 6 min. Secondary outcomes were inspiratory muscle strength, endurance, lung function, and blood gas levels...
February 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28137226/management-of-status-asthmaticus-in-children
#20
Kam-Lun E Hon, Alexander K C Leung
BACKGROUND: Status asthmaticus is an acute exacerbation of asthma that is persistent and intractable and remains unresponsive to initial treatment with bronchodilators and systemic corticosteroids and that can result in hypoxemia, hypercarbia, and secondary respiratory failure. METHOD: We reviewed treatment and recent patents on management of status asthmaticus. CONCLUSIONS: Supplemental oxygen should be given to maintain an oxygen saturation of ≥92% in room air...
30, 2017: Recent Patents on Inflammation & Allergy Drug Discovery
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