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https://www.readbyqxmd.com/read/29351442/measurements-of-pulmonary-gas-exchange-efficiency-using-expired-gas-and-oximetry-results-in-normal-subjects
#1
John B West, Daniel L Wang, Gordon Kim Prisk
We are developing a novel, noninvasive method for measuring the efficiency of pulmonary gas exchange in patients with lung disease. The patient wears an oximeter, and we measure the partial pressures of oxygen and carbon dioxide in inspired and expired gas using miniature analyzers. The arterial PO2 is then calculated from the oximeter reading and the oxygen dissociation curve, using the end-tidal PCO2 to allow for the Bohr effect. This calculation is only accurate when the oxygen saturation is below 94% and therefore these normal subjects breathed 12...
December 20, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29343713/atmospheric-co2-effect-on-stable-carbon-isotope-composition-of-terrestrial-fossil-archives
#2
Vincent J Hare, Emma Loftus, Amy Jeffrey, Christopher Bronk Ramsey
The 13C/12C ratio of C3 plant matter is thought to be controlled by the isotopic composition of atmospheric CO2 and stomatal response to environmental conditions, particularly mean annual precipitation (MAP). The effect of CO2 concentration on 13C/12C ratios is currently debated, yet crucial to reconstructing ancient environments and quantifying the carbon cycle. Here we compare high-resolution ice core measurements of atmospheric CO2 with fossil plant and faunal isotope records. We show the effect of pCO2 during the last deglaciation is stronger for gymnosperms (-1...
January 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29340931/vascutrainer-a-mobile-and-disposable-bioreactor-system-for-the-conditioning-of-tissue-engineered-vascular-grafts
#3
Frederic Wolf, Diana M Rojas González, Ulrich Steinseifer, Markus Obdenbusch, Werner Herfs, Christian Brecher, Stefan Jockenhoevel, Petra Mela, Thomas Schmitz-Rode
In vitro tissue engineering of vascular grafts requires dynamic conditioning in a bioreactor system for in vitro tissue maturation and remodeling to receive a mechanically adequate and hemocompatible implant. The goal of the current work was to develop a bioreactor system for the conditioning of vascular grafts which is (i) able to create a wide range of flow, pressure and frequency conditions, including physiological ones; (ii) compact and easy to assemble; (iii) transportable; (iv) disposable. The system is driven by a small centrifugal pump controlled via a custom-made control unit, which can also be operated on batteries to allow for autonomous transportation...
January 16, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29339355/re-evaluation-of-the-normal-range-of-serum-total-co2-concentration
#4
REVIEW
Jeffrey A Kraut, Nicolaos E Madias
A reliable determination of blood pH, PCO2, and [HCO3-] is necessary for assessing the acid-base status of a patient. However, most acid-base disorders are first recognized through abnormalities in serum total CO2 concentration ([TCO2]) in venous blood, a surrogate for [HCO3-]. In screening patients on the basis of serum [TCO2], we have been concerned about the wide limits of normal for serum [TCO2], 10-13 mEq/L, reported by many clinical laboratories. Indeed, we have encountered patients with serum [TCO2] values within the lower or upper end of the normal range of the reporting laboratory, who subsequently were shown to have a cardinal acid-base disorder...
January 16, 2018: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29339078/analytical-and-pre-analytical-performance-characteristics-of-a-novel-cartridge-type-blood-gas-analyzer-for-point-of-care-and-laboratory-testing
#5
Matthijs Oyaert, Tom Van Maerken, Silke Bridts, Silvi Van Loon, Heleen Laverge, Veronique Stove
BACKGROUND: Point-of-care blood gas test results may benefit therapeutic decision making by their immediate impact on patient care. We evaluated the (pre-)analytical performance of a novel cartridge-type blood gas analyzer, the GEM Premier 5000 (Werfen), for the determination of pH, partial carbon dioxide pressure (pCO2), partial oxygen pressure (pO2), sodium (Na+), potassium (K+), chloride (Cl-), ionized calcium (iCa2+), glucose, lactate, and total hemoglobin (tHb). METHODS: Total imprecision was estimated according to the CLSI EP5-A2 protocol...
January 12, 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29338021/coral-physiology-and-microbiome-dynamics-under-combined-warming-and-ocean-acidification
#6
Andréa G Grottoli, Paula Dalcin Martins, Michael J Wilkins, Michael D Johnston, Mark E Warner, Wei-Jun Cai, Todd F Melman, Kenneth D Hoadley, D Tye Pettay, Stephen Levas, Verena Schoepf
Rising seawater temperature and ocean acidification threaten the survival of coral reefs. The relationship between coral physiology and its microbiome may reveal why some corals are more resilient to these global change conditions. Here, we conducted the first experiment to simultaneously investigate changes in the coral microbiome and coral physiology in response to the dual stress of elevated seawater temperature and ocean acidification expected by the end of this century. Two species of corals, Acropora millepora containing the thermally sensitive endosymbiont C21a and Turbinaria reniformis containing the thermally tolerant endosymbiont Symbiodinium trenchi, were exposed to control (26...
2018: PloS One
https://www.readbyqxmd.com/read/29337079/rising-pco2-in-freshwater-ecosystems-has-the-potential-to-negatively-affect-predator-induced-defenses-in-daphnia
#7
Linda C Weiss, Leonie Pötter, Annika Steiger, Sebastian Kruppert, Uwe Frost, Ralph Tollrian
Anthropogenically released CO2 accumulates in the global carbon cycle and is anticipated to imbalance global carbon fluxes [1]. For example, increased atmospheric CO2 induces a net air-to-sea flux where the oceans take up large amounts of atmospheric CO2 (i.e., ocean acidification [2-5]). Research on ocean acidification is ongoing, and studies have demonstrated the consequences for ecosystems and organismal biology with major impacts on marine food webs, nutrient cycles, overall productivity, and biodiversity [6-9]...
January 9, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29334672/oxidative-and-interactive-challenge-of-cadmium-and-ocean-acidification-on-the-smooth-scallop-flexopecten-glaber
#8
Alessandro Nardi, Maura Benedetti, Daniele Fattorini, Francesco Regoli
Ocean acidification (OA) may affect sensitivity of marine organisms to metal pollution modulating chemical bioavailability, bioaccumulation and biological responsiveness of several cellular pathways. In this study, the smooth scallop Flexopecten glaber was exposed to various combinations of reduced pH (pH/pCO2 7.4/∼3000 μatm) and Cd (20 μg/L). The analyses on cadmium uptake were integrated with those of a wide battery of biomarkers including metallothioneins, single antioxidant defenses and total oxyradical scavenging capacity in digestive gland and gills, lysosomal membrane stability and onset of genotoxic damage in haemocytes...
January 8, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29333619/surrogate-scale-for-evaluating-respiratory-function-based-on-complete-blood-count-parameters
#9
Yang Guang, Zhou Jie, Dong Feng, Liu Hui
BACKGROUND: In this study, we aimed to identify a simple method for evaluating respiratory function using complete blood count parameters. METHODS: The complete blood count parameters, including red blood cell (RBC) count, hemoglobin (Hb) level, lymphocyte (Lym) and platelet (Plt) count, and partial pressure of oxygen (PO2 ) level, were measured using automated analyzers in patients with chronic obstructive pulmonary disease (COPD), aged subjects, and young subjects (control group)...
January 15, 2018: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29324394/effects-of-ocean-acidification-on-copepods
#10
REVIEW
Minghua Wang, Chang-Bum Jeong, Young Hwan Lee, Jae-Seong Lee
Ocean acidification (OA) leads to significant changes in seawater carbon chemistry, broadly affects marine organisms, and considered as a global threat to the fitness of marine ecosystems. Due to the crucial role of copepods in marine food webs of transferring energy from primary producers to higher trophic levels, numerous studies have been conducted to examine the impacts of OA on biological traits of copepods such as growth and reproduction. Under OA stress, the copepods demonstrated species-specific and stage-dependent responses...
January 5, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29310868/high-velocity-nasal-insufflation-in-the-treatment-of-respiratory-failure-a-randomized-clinical-trial
#11
Pratik Doshi, Jessica S Whittle, Michael Bublewicz, Joseph Kearney, Terrell Ashe, Russell Graham, Suesann Salazar, Terry W Ellis, Dianna Maynard, Rose Dennis, April Tillotson, Mandy Hill, Misha Granado, Nancy Gordon, Charles Dunlap, Sheldon Spivey, Thomas L Miller
STUDY OBJECTIVE: We compare high-velocity nasal insufflation, a form of high-flow nasal cannula, with noninvasive positive-pressure ventilation in the treatment of undifferentiated respiratory failure with respect to therapy failure, as indicated by requirement for endotracheal intubation or cross over to the alternative therapy. METHODS: This was a multicenter, randomized trial of adults presenting to the emergency department (ED) with respiratory failure requiring noninvasive positive-pressure ventilation...
January 5, 2018: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/29310326/efficacy-and-safety-of-remifentanil-for-analgesia-in-cesarean-delivery
#12
Xuan Zhou, Lian-Jin Jin, Chun-Yang Hu, Meng Chen, Ying Li, Yue-Shun Zhang
BACKGROUND: This study aimed to assess the efficacy and safety of remifentanil as a general anesthetic during cesarean delivery. MATERIAL AND METHODS: Fifty women with singleton pregnancies undergoing cesarean delivery were randomly divided into intervention and control groups, each group containing 25 subjects. Participants in the intervention group received remifentanil (infused at 2 μg/kg/h), whereas subjects in the control group were given dexmedetomidine (infused at 0...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29298438/influence-of-pco2-control-on-clinical-and-neurodevelopmental-outcomes-of-extremely-low-birth-weight-infants
#13
Ulrich H Thome, Jens Dreyhaupt, Orsolya Genzel-Boroviczeny, Bettina Bohnhorst, Manuel Schmid, Hans Fuchs, Oliver Rohde, Stefan Avenarius, Hans-Georg Topf, Andrea Zimmermann, Dirk Faas, Katharina Timme, Barbara Kleinlein, Horst Buxmann, Wilfried Schenk, Hugo Segerer, Norbert Teig, Benjamin Ackermann, Roland Hentschel, Matthias Heckmann, Rolf Schlösser, Jochen Peters, Rainer Rossi, Wolfgang Rascher, Ralf Böttger, Jürgen Seidenberg, Gesine Hansen, Harald Bode, Maria Zernickel, Rainer Muche, Helmut D Hummler
BACKGROUND: Levels or fluctuations in the partial pressure of CO2 (PCO2) may affect outcomes for extremely low birth weight infants. OBJECTIVES: In an exploratory analysis of a randomized trial, we hypothesized that the PCO2 values achieved could be related to significant outcomes. METHODS: On each treatment day, infants were divided into 4 groups: relative hypocapnia, normocapnia, hypercapnia, or fluctuating PCO2. Ultimate assignment to a group for the purpose of this analysis was made according to the group in which an infant spent the most days...
January 4, 2018: Neonatology
https://www.readbyqxmd.com/read/29298095/six-month-outcome-of-immunocompromised-severe-ards-patients-rescued-by-ecmo-an-international-multicenter-retrospective-study
#14
Matthieu Schmidt, Peter Schellongowski, Nicolò Patroniti, Fabio Silvio Taccone, Dinis Reis Miranda, Jean Reuter, Helène Prodanovic, Marc Pierrot, Amandine Dorget, Sunghoon Park, Martin Balik, Alexandre Demoule, Ilaria Alice Crippa, Alain Mercat, Philipp Wohlfarth, Romain Sonneville, Alain Combes
OBJECTIVES: To report outcomes of immunocompromised patients treated with extracorporeal membrane oxygenation (ECMO) for severe acute respiratory distress syndrome (ARDS) and to identify their pre-ECMO predictors of 6-month mortality and main ECMO-related complications. METHODS: Retrospective multicenter study in 10 international intensive care units (ICUs) with high ECMO-case volumes. Immunocompromised patients, defined as having hematological malignancies, active solid tumor, solid-organ transplant, acquired immunodeficiency syndrome, or long-term or high-dose corticosteroid or immunosuppressant use, and severe ECMO-treated ARDS from 2008 to 2015 were included Measurements and Main Results: We collected demographics, clinical, ECMO-related complications, ICU- and 6-month-outcome data for 203 patients (median APACHE II 28 [25th ;75th percentile, 20;33]; age 51 [38;59] years, PaO2/FiO2 60 [50;82] mmHg before ECMO) who fulfilled our inclusion criteria...
January 3, 2018: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/29297843/short-duration-immobilization-of-atlantic-walrus-odobenus-rosmarus-rosmarus-with-etorphine-and-reversal-with-naltrexone
#15
Rolf-Arne Ølberg, Kit M Kovacs, Mads F Bertelsen, Varvara Semenova, Christian Lydersen
Forty adult, male Atlantic walruses ( Odobenus rosmarus rosmarus) were successfully immobilized for the attachment of global positioning system loggers on their tusks and collection of various biological samples. A standard dose of 7.8 mg etorphine was used for each animal, regardless of body size. All animals were reversed with an iv or im injection of 250 mg naltrexone, immediately after tag attachment. Twenty-seven of the animals were intubated and ventilated with 100% oxygen during the recovery period. The induction time was, on average, 4 min 51 sec ± 1 min 46 sec...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29297372/detailing-the-cardiovascular-profile-in-shock-patients
#16
REVIEW
Daniel De Backer
Evaluation of the cardiovascular profile of critically ill patients is one of the most important actions performed in critically ill patients. It allows recognition that the patient is in shock and characterization of the type of circulatory failure. This step is crucial to initiate supportive interventions and to cure the cause responsible for the development of shock. Evaluation of tissue perfusion allows identification of the patient insufficiently resuscitated and also to trigger therapeutic interventions...
December 28, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29291059/elevated-pco2-affects-tissue-biomass-composition-but-not-calcification-in-a-reef-coral-under-two-light-regimes
#17
C B Wall, R A B Mason, W R Ellis, R Cunning, R D Gates
Ocean acidification (OA) is predicted to reduce reef coral calcification rates and threaten the long-term growth of coral reefs under climate change. Reduced coral growth at elevated pCO2 may be buffered by sufficiently high irradiances; however, the interactive effects of OA and irradiance on other fundamental aspects of coral physiology, such as the composition and energetics of coral biomass, remain largely unexplored. This study tested the effects of two light treatments (7.5 versus 15.7 mol photons m-2 d-1) at ambient or elevated pCO2 (435 versus 957 µatm) on calcification, photopigment and symbiont densities, biomass reserves (lipids, carbohydrates, proteins), and biomass energy content (kJ) of the reef coral Pocillopora acuta from Kāne'ohe Bay, Hawai'i...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29289362/effects-of-ocean-acidification-with-pco2-diurnal-fluctuations-on-survival-and-larval-shell-formation-of-ezo-abalone-haliotis-discus-hannai
#18
Toshihiro Onitsuka, Hideki Takami, Daisuke Muraoka, Yukio Matsumoto, Ayumi Nakatsubo, Ryo Kimura, Tsuneo Ono, Yukihiro Nojiri
This study assessed the effects of constant and diurnally fluctuating pCO2 on development and shell formation of larval abalone Haliotis discus hannai. The larvae was exposed to different pCO2 conditions; constant [450, 800, or 1200 μatm in the first experiment (Exp. I), 450 or 780 μatm in the second experiment (Exp. II)] or diurnally fluctuating pCO2 (800 ± 400 or 1200 ± 400 μatm in Exp. I, 450 ± 80, 780 ± 200 or 780 ± 400 μatm in Exp. II). Mortality, malformation rates or shell length of larval abalone were not significantly different among the 450, 800, and 800 ± 400 μatm pCO2 treatments...
December 19, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/29273075/management-of-pneumothorax-in-hemodynamically-stable-preterm-infants-using-high-frequency-oscillatory-ventilation-report-of-five-cases
#19
Claudia Aurilia, Cinzia Ricci, Milena Tana, Chiara Tirone, Alessandra Lio, Alessandro Gambacorta, Angela Paladini, Giovanni Vento
BACKGROUND: Despite an increased use of non-invasive ventilatory strategies and gentle ventilation, pneumothorax remains a common complication in preterm infants. The ventilator management of infants with air leaks remains challenging in terms of both prevention and treatment. Recently the safety and efficacy of expectant management avoiding chest tube drainage to treat large air leak in preterm infants hemodynamically stable has been reported. CASE PRESENTATION: In the present study, we report five cases of preterm infants with birth weight ≤ 1250 g affected by respiratory distress syndrome and treated with nasal continuous positive airway pressure as first intention...
December 22, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/29250141/gynostemma-pentaphyllum-is-neuroprotective-in-a-rat-model-of-cardiopulmonary-resuscitation
#20
Gerburg Keilhoff, Torben Esser, Maximilian Titze, Uwe Ebmeyer, Lorenz Schild
Asphyxial cardiac arrest (ACA)-induced ischemia results in acute and delayed neuronal cell death. The early reperfusion phase is critical for the outcome. Intervention strategies directed to this period are promising to reduce ACA/resuscitation-dependent impairments. This study focused on the evaluation of the protective potential of an extract from Gynostemma pentaphyllum (GP), a plant used in traditional medicine with antioxidative, glucose lowering and neuroprotective activities, in an ACA rat model. We tested the following parameters: i) Basic systemic parameters such as pCO2 and blood glucose value within the first 30 min post-ACA; ii) mitochondrial response by determining activities of citrate synthase, respiratory chain complexes I + III and II + III, and the composition of cardiolipin 6 and 24 h post-ACA; iii) neuronal vitality of the CA1 hippocampal region by immunohistochemistry 24 h and 7 days post-ACA; and iv) cognitive function by a novel object recognition test 7 days post-ACA...
December 2017: Experimental and Therapeutic Medicine
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