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https://www.readbyqxmd.com/read/29150452/a-metabolic-hypothesis-for-the-evolution-of-temperature-effects-on-the-arterial-pco2-and-ph-of-vertebrate-ectotherms
#1
Stanley S Hillman, Michael S Hedrick
Body temperature increases in ectothermic vertebrates characteristically lead to both increases in arterial PCO2 (PaCO2) and declines in resting arterial pH (pHa) of about 0.017 pH units/°C increase in temperature. This 'alphastat' pH pattern has previously been interpreted as being evolutionarily-driven by the maintenance of a constant protonation state on the imidazole moiety of histidine protein residues, hence stabilizing protein structure-function. Analysis of the existing data for interclass responses of ectothermic vertebrates show different degrees of PaCO2 increases and pH declines with temperature between the classes with reptiles>amphibians>fish...
November 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29142549/comparison-of-pressure-vs-volume-controlled-ventilation-on-oxygenation-parameters-of-obese-patients-undergoing-laparoscopic-cholecystectomy
#2
Reza Movassagi, Majid Montazer, Ata Mahmoodpoor, Vahid Fattahi, Afshin Iranpour, Sarvin Sanaie
Background & Objective: There is no special guideline for the best ventilation mode during laparoscopic anesthesia in obese patients and there are too many studies with different controversial points. The aim of this study was to compare the effect of pressure controlled ventilation (PCV) vs. volume controlled ventilation (VCV) on respiratory and oxygenation parameters in patients undergoing laparoscopic cholecystectomy. Methods: Seventy patients with 30 <BMI<40 and ASA physical status I-II were studied in this randomized prospective trial...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29142384/hypercapnic-respiratory-failure-in-case-of-chiari-1-5-malformation-case-report-and-review-of-the-literature
#3
Viralkumar M Vasani, Subhas Kanti Konar, S Satish
Type 2 respiratory failure is defined as hypercapnia associated with hypoxia. Chiari 1.5 is known as herniation of the cerebellar tonsils along with brain stem and fourth ventricle. We report a 35-year-old male who presented with acute hypercapnic respiratory failure (Type 2), without any preexisting neurological or respiratory abnormality. Analysis of blood gases in emergency revealed a pH of 7.12, pCO2 of 132 mmHg, and arterial oxygen tension of 118 mm Hg. He was intubated and ventilated. Magnetic resonance imaging brain revealed herniation of the cerebellar tonsils along with brain stem and fourth ventricle...
October 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/29137785/synthesis-and-characterization-of-polyester-bionanocomposite-membrane-with-ultrasonic-irradiation-process-for-gas-permeation-and-antibacterial-activity
#4
Hashem Ahmadizadegan, Sheida Esmaielzadeh, Mahdi Ranjbar, Zahra Marzban, Fatemeh Ghavas
Optically active bionanocomposite membranes composed of polyester (PE) and cellulose/silica bionanocomposite (BNCs) prepared with simple, green and inexpensive ultrasonic irradiation process. It is a novel method to enhance the gas separation performance. The novel optically active diol containing functional trifluoromethyl groups was prepared in four steps reaction and it was fully characterized by different techniques. Commercially available silica nanoparticles were modified with biodegradable nanocellulose through ultrasonic irradiation technique...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29133139/methemoglobin-reductase-activity-in-intact-fish-red-blood-cells
#5
Frank B Jensen, Karsten Nielsen
Red blood cells (RBCs) possess methemoglobin reductase activity that counters the ongoing oxidation of hemoglobin (Hb) to methemoglobin (metHb), which in circulating blood is caused by Hb autoxidation or reactions with nitrite. We describe an assay for determining metHb reductase activity in intact RBCs in physiological saline at normal Pco2 and pH. After initial loading of oxygenated RBCs with nitrite (partly oxidizing Hb to metHb), the nitrite is removed by three washes of the RBCs in nitrite-free physiological saline to enable the detection of RBC metHb reductase activity in the absence of counteracting oxidation...
November 10, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/29131536/non-invasive-ventilation-use-in-status-asthmaticus-16%C3%A2-years-of-experience-in-a-tertiary-intensive-care
#6
Kirsten Rl Bond, Carl Ae Horsley, Anthony B Williams
OBJECTIVE: To describe the use of non-invasive ventilation (NIV) in adults presenting with status asthmaticus to Middlemore Hospital Critical Care Complex (CCC, South Auckland, New Zealand) from 2000 to 2015. METHOD: Retrospective review of all adult asthma admissions to the Hospital CCC between 2000 and 2015. Demographic, physiological, treatment data and blood gas results were recorded. RESULTS: There were 265 asthma admissions to Middlemore Hospital CCC during the study period...
November 12, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/29130541/depression-social-support-and-clinical-outcomes-following-lung-transplantation
#7
Patrick J Smith, Laurie D Snyder, Scott M Palmer, Benson M Hoffman, Gregory L Stonerock, Krista K Ingle, Caroline K Saulino, James A Blumenthal
BACKGROUND: Depressive symptoms are common among lung transplant candidates and have been associated with poorer clinical outcomes in some studies. Previous studies have been plagued by methodologic problems, including small sample sizes, few clinical events, and uncontrolled confounders, particularly perioperative complications. In addition, few studies have examined social support as a potential protective factor. We therefore examined the association between pre-transplant depressive symptoms, social support, and mortality in a large sample of lung transplant recipients...
November 12, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/29129151/false-positive-diagnosis-of-brain-death-following-the-pediatric-guidelines-case-report-and-discussion
#8
D Alan Shewmon
A 2-year-old boy with severe head trauma was diagnosed brain dead according to the 2011 Pediatric Guidelines. Computed tomographic (CT) scan showed massive cerebral edema with herniation. Intracranial pressures were extremely high, with cerebral perfusion pressures around 0 for several hours. An apnea test was initially contraindicated; later, one had to be terminated due to oxygen desaturation when the Pco2 had risen to 57.9 mm Hg. An electroencephalogram (EEG) was probably isoelectric but formally interpreted as equivocal...
December 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/29129133/association-between-hypocapnia-and-ventilation-during-the-first-days-of-life-and-brain-injury-in-asphyxiated-newborns-treated-with-hypothermia
#9
Maria Agustina Lopez Laporte, Hui Wang, Priscille-Nice Sanon, Stephanie Barbosa Vargas, Julie Maluorni, Emmanouil Rampakakis, Pia Wintermark
PURPOSE: Therapeutic hypothermia is the standard treatment for asphyxiated newborns. Since hypocapnia is common in these newborns, the aim of this study was to assess the association between hypocapnia, ventilation and brain injury. METHODS: We conducted a retrospective cohort study of all asphyxiated newborns treated with hypothermia from 2008 to 2014. Partial pressure of carbon dioxide (pCO2), ventilatory status and modes of ventilation were recorded during the first 4 days of life...
November 12, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29128121/occurrence-of-greenhouse-gases-in-the-aquifers-of-the-walloon-region-belgium
#10
Anna Jurado, Alberto V Borges, Estanislao Pujades, Vivien Hakoun, Joël Otten, Kay Knöller, Serge Brouyère
This work aims to (1) identify the most conductive conditions for the generation of greenhouses gases (GHGs) in groundwater (e.g., hydrogeological contexts and geochemical processes) and (2) evaluate the indirect emissions of GHGs from groundwater at a regional scale in Wallonia (Belgium). To this end, nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) concentrations and the stable isotopes of nitrate (NO3(-)) and sulphate were monitored in 12 aquifers of the Walloon Region (Belgium). The concentrations of GHGs range from 0...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29127768/diabetic-ketoacidosis-hyperuricemia-and-encephalopathy-intractable-to-regular-dose-insulin
#11
Jillian Gregory, Sonali Basu
BACKGROUND: Diabetic ketoacidosis (DKA) in children less than 1 year of age is a rare occurrence. Typical presentation includes a prodrome of weight loss and polyuria with subsequent presentation to medical care when acidosis becomes symptomatic. CASE PRESENTATION: We describe an unusual case of a previously healthy infant with a 3 days' history of constipation, presenting acutely with abdominal pain, lethargy, and dehydration. On initial evaluation, our patient had profound encephalopathy, with marked tachypnea and work of breathing...
November 11, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/29124322/air-breathing-changes-the-pattern-for-temperature-induced-ph-regulation-in-a-bimodal-breathing-teleost
#12
Christian Damsgaard, Mikkel Thy Thomsen, Mark Bayley, Tobias Wang
It is well established that ectothermic vertebrates regulate a lower arterial pH when temperature increases. Typically, water-breathers reduce arterial pH by altering plasma [HCO3(-)], whilst air-breathers rely on ventilatory adjustments to modulate arterial PCO2. However, no studies have investigated whether the shift from water- to air-breathing within a species changes the mechanisms for temperature-induced pH regulation. Here, we used the striped catfish Pangasianodon hypophthalmus to examine how pH regulation is affected by water- versus air-breathing, since P...
November 9, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/29116603/leigh-syndrome-in-individuals-bearing-m-9185t-c-mtatp6-variant-is-hyperventilation-a-factor-which-starts-its-development
#13
Dorota Piekutowska-Abramczuk, Rafał Rutyna, Elżbieta Czyżyk, Elżbieta Jurkiewicz, Katarzyna Iwanicka-Pronicka, Dariusz Rokicki, Sylwia Stachowicz, Joanna Strzemecka, Wiesław Guz, Michał Gawroński, Aneta Kosierb, Joanna Ligas, Mateusz Puchala, Anna Drelich-Zbroja, Małgorzata Bednarska-Makaruk, Wojciech Dąbrowski, Elżbieta Ciara, Janusz B Książyk, Ewa Pronicka
Leigh syndrome (LS), subacute necrotizing encephalomyelopathy is caused by various genetic defects, including m.9185T>C MTATP6 variant. Mechanism of LS development remains unknown. We report on the acid-base status of three patients with m.9185T>C related LS. At the onset, it showed respiratory alkalosis, reflecting excessive respiration effort (hyperventilation with low pCO2). In patient 1, the deterioration occurred in temporal relation to passive oxygen therapy. To the contrary, on the recovery, she demonstrated a relatively low respiratory drive, suggesting that a "hypoventilation" might be beneficial for m...
November 7, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29112104/cardiogenic-shock-due-to-end-stage-heart-failure-and-acute-myocardial-infarction-characteristics-and-outcome-of-temporary-mechanical-circulatory-support
#14
Hoong Sern Lim, Neil Howell
BACKGROUND: Mechanical circulatory support (MCS) is increasingly used in cardiogenic shock, but outcomes may differ between patients with acute myocardial infarction (AMI) or end-stage heart failure (ESHF). This study aimed to describe the characteristics of patients with cardiogenic shock due to AMI and ESHF. METHODS: Single centre study of consecutive patients with cardiogenic shock due to AMI (n = 26) and ESHF (n = 42) who underwent MCS (extracorporeal life support, Impella or temporary ventricular assist devices)...
November 3, 2017: Shock
https://www.readbyqxmd.com/read/29108676/the-fatty-acid-content-of-plankton-is-changing-in-subtropical-coastal-waters-as-a-result-of-oa-results-from-a-mesocosm-study
#15
Tifeng Wang, Shanying Tong, Nana Liu, Futian Li, Mark L Wells, Kunshan Gao
Ocean Acidification (OA) effects on marine plankton are most often considered in terms of inorganic carbon chemistry, but decreasing pH may influence other aspects of cellular metabolism. Here we present the effects of OA on the fatty acid (FA) content and composition of an artificial phytoplankton community (Phaeodactylum tricornutum, Thalassiosira weissflogii, and Emiliania huxleyi) in a fully replicated, ∼4 m(3) mesocosm study in subtropical coastal waters (Wuyuan Bay, China, 24.52°N, 117.18°E) at present day (400 μatm) and elevated (1000 μatm) pCO2 concentrations...
November 3, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/29102173/interactive-effects-of-increased-temperature-pco2-and-the-synthetic-progestin-levonorgestrel-on-the-fitness-and-breeding-of-the-amphipod-gammarus-locusta
#16
P G Cardoso, E M Loganimoce, T Neuparth, M J Rocha, E Rocha, F Arenas
Given the lack of knowledge regarding climate change-chemical exposure interactions, it is vital to evaluate how these two drivers jointly impact aquatic species. Thus, for the first time, we aimed at investigating the combined effects of increased temperature, pCO2 and the synthetic progestin levonorgestrel on survival, growth, consumption rate and reproduction of the amphipod Gammarus locusta. For that, a full factorial design manipulating temperature [ambient temperature and warming (+4 °C)], pCO2 [normocapnia and hypercapnia (Δ pH 0...
October 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29100692/ground-air-a-first-approximation-of-the-earth-s-second-largest-reservoir-of-carbon-dioxide-gas
#17
James U L Baldini, Rachel A Bertram, Harriet E Ridley
It is becoming increasingly clear that a substantial reservoir of carbon exists in the unsaturated zone of aquifers, though the total size of this reservoir on a global scale remains unquantified. Here we provide the first broad estimate of the amount of carbon dioxide gas found in this terrestrial reservoir. We calculate that between 2 and 53 PgC exists as gaseous CO2 in aquifers worldwide, generated by the slow microbial oxidation of organic particles transported into aquifers by percolating groundwater. Importantly, this carbon reservoir is in the form of CO2 gas, and is therefore transferable to the Earth's atmosphere without any phase change...
October 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29097758/isoflurane-inhalation-anesthesia-should-be-a-new-requirement-in-intracavernosal-pressure-detection-the-gold-standard-of-erectile-function-assessment
#18
Jinhong Li, Changjing Wu, Fudong Fu, Xuanhe You, Liang Gao, Romel Wazir, Feng Qin, Ping Han, Jiuhong Yuan
Intracavernosal pressure (ICP) is gold standard for the detection of erectile function in animals, but no consensus has yet been achieved on what kind of anesthetic protocol should be applied. A total of 16 adult male Sprague-Dawley rats were randomized into two groups. In group A, chloral hydrate was injected intraperitoneally. Rats in group B were induced in 5% isoflurane for 3 min and then maintained in 1.0-1.5% isoflurane. Mean arterial pressure (MAP), respiratory rate (RR) and heart rate were monitored during all experiments...
November 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29093740/differences-in-neurochemical-profiles-of-two-gadid-species-under-ocean-warming-and-acidification
#19
Matthias Schmidt, Heidrun Sigrid Windisch, Kai-Uwe Ludwichowski, Sean Lando Levin Seegert, Hans-Otto Pörtner, Daniela Storch, Christian Bock
Background: Exposure to future ocean acidification scenarios may alter the behaviour of marine teleosts through interference with neuroreceptor functioning. So far, most studies investigated effects of ocean acidification on the behaviour of fish, either isolated or in combination with environmental temperature. However, only few physiological studies on this issue were conducted despite the putative neurophysiological origin of the CO2-induced behavioural changes. Here, we present the metabolic consequences of long-term exposure to projected ocean acidification (396-548 μatm PCO2 under control and 915-1272 μatm under treatment conditions) and parallel warming in the brain of two related fish species, polar cod (Boreogadus saida, exposed to 0 °C, 3 °C, 6 °C and 8 °C) and Atlantic cod (Gadus morhua, exposed to 3 °C, 8 °C, 12 °C and 16 °C)...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/29089526/salinity-stratification-controlled-productivity-variation-over-300-ky-in-the-bay-of-bengal
#20
R Da Silva, A Mazumdar, T Mapder, A Peketi, R K Joshi, A Shaji, P Mahalakshmi, B Sawant, B G Naik, M A Carvalho, S K Molletti
The unique hydrographic setting of the Bay of Bengal (BoB) makes it an ideal tropical marine system to study the influence of regional and global forcings on productivity and [CO2aq] through the late quaternary. Enormous fresh water flux into the BoB and consequent salinity stratification significantly weaken the convective mixing and wind driven processes which are commonly responsible for transport of nutrients to the euphotic zone driving primary productivity. Here we present a high resolution organic carbon-CaCO3 MAR and δ(13)CTOC records for the last 300 ky from the BoB...
October 31, 2017: Scientific Reports
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