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mechanical ventilation physiology

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https://www.readbyqxmd.com/read/29155460/antarctic-emerald-rockcod-have-the-capacity-to-compensate-for-warming-when-uncoupled-from-co2-acidification
#1
Brittany E Davis, Erin E Flynn, Nathan A Miller, Frederick A Nelson, Nann A Fangue, Anne E Todgham
Increases in atmospheric CO2 levels and associated ocean changes are expected to have dramatic impacts on marine ecosystems. Although the Southern Ocean is experiencing some of the fastest rates of change, few studies have explored how Antarctic fishes may be affected by co-occurring ocean changes, and even fewer have examined early life stages. To date, no studies have characterized potential trade-offs in physiology and behavior in response to projected multiple climate change stressors (ocean acidification and warming) on Antarctic fishes...
November 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29152912/physiological-and-anatomical-dead-space-in-mechanically-ventilated-newborn-infants
#2
Theodore Dassios, Paul Dixon, Ann Hickey, Sotirios Fouzas, Anne Greenough
OBJECTIVES: To compare the anatomical (VD-Ana ) and alveolar dead space (VD-Alv ) in term and prematurely born infants and identify the clinical determinants of those indices. WORKING HYPOTHESIS: VD-Ana and VD-Alv will be higher in prematurely born compared to term born infants. STUDY DESIGN: Retrospective analysis of data collected at King's College Hospital NHS Foundation Trust, London, UK. PATIENT SELECTION: Fifty-six infants (11 term, 45 preterm) were studied at a median age of 8 (IQR 2-33) days...
November 20, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29147897/vacuum-assisted-wound-closure-with-mesh-mediated-fascial-traction-achieves-better-outcomes-than-vacuum-assisted-wound-closure-alone-a-comparative-study
#3
Giuseppe Salamone, Leo Licari, Giovanni Guercio, Albert Comelli, Mirko Mangiapane, Nicolò Falco, Roberta Tutino, Noemi Bagarella, Sofia Campanella, Calogero Porrello, Roberto Gullo, Gianfranco Cocorullo, Gaspare Gulotta
BACKGROUND: Open abdomen (OA) permits the application of damage control surgery principles when abdominal trauma, sepsis, severe acute peritonitis and abdominal compartmental syndrome (ACS) occur. METHODS: Non-traumatic patients treated with OA between January 2010 and December 2015 were identified in a prospective database, and the data collected were retrospectively reviewed. Patients' records were collected from charts and the surgical and intensive care unit (ICU) registries...
November 16, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/29141527/decreases-in-mixed-venous-blood-o2-saturation-in-cardiac-surgery-patients-following-extubation
#4
Jeffrey Williams, Anna McLean, Jalil Ahari, Arun Jose, Georges Al-Helou, Italo Ibi, Farzad Najam Md, Guillermo Gutierrez
BACKGROUND: Decreases in mixed venous O2 saturation (SvO2) have been reported to occur in postcardiac surgery patients during weaning from mechanical ventilation. Our aim was to establish whether the physiological mechanism responsible for this phenomenon was a decrease in systemic O2 delivery (DO2) or an increase in global O2 consumption ([Formula: see text]O2). METHODS: We studied 21 mechanically ventilated, postoperative cardiac patients for 30 minutes before and 60 minutes after extubation...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/29138031/mortality-and-pulmonary-outcomes-of-extremely-preterm-infants-exposed-to-antenatal-corticosteroids
#5
Colm P Travers, Waldemar A Carlo, Scott A Mcdonald, Abhik Das, Edward F Bell, Namasivayam Ambalavanan, Alan H Jobe, Ronald N Goldberg, Carl T D'Angio, Barbara J Stoll, Seetha Shankaran, Abbot R Laptook, Barbara Schmidt, Michele C Walsh, Pablo J Sanchez, M Bethany Ball, Ellen C Hale, Nancy S Newman, Rosemary D Higgins
BACKGROUND: Antenatal corticosteroids are given primarily to induce fetal lung maturation but results from meta-analyses of randomized controlled trials have not shown mortality or pulmonary benefits for extremely preterm infants although these are the infants most at risk of mortality and pulmonary disease. OBJECTIVE: To determine if exposure to antenatal corticosteroids is associated with a lower rate of death and pulmonary morbidities by 36 weeks' postmenstrual age...
November 11, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29137585/association-of-positive-fluid-balance-and-mortality-in-sepsis-and-septic-shock-in-an-australian-cohort
#6
M G Pittard, S J Huang, A S McLean, S R Orde
In patients with septic shock, a correlation between positive fluid balance and worsened outcomes has been reported in multiple observational studies worldwide. No published data exists in an Australasian cohort. We set out to explore this association in our institution. We conducted a retrospective audit of patient records from August 2012 to May 2015 in a single-centre, 24-bed surgical and medical intensive care unit (ICU) in Sydney, Australia. All patients with septic shock were included. Exclusion criteria included length of stay less than 24 hours or vasopressors needed for less than six hours...
November 2017: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/29134245/esophageal-pressure-research-or-clinical-tool
#7
REVIEW
E Baedorf Kassis, S H Loring, D Talmor
Esophageal manometry has traditionally been utilized for respiratory physiology research, but clinicians have recently found numerous applications within the intensive care unit. Esophageal pressure (PEs) is a surrogate for pleural pressures (PPl), and the difference between airway pressure (PAO) and PEs provides a good estimate for the pressure across the lung also known as the transpulmonary pressure (PL). Differentiating the effects of mechanical ventilation and spontaneous breathing on the respiratory system, chest wall, and across the lung allows for improved personalization in clinical decision making...
November 13, 2017: Medizinische Klinik, Intensivmedizin und Notfallmedizin
https://www.readbyqxmd.com/read/29132231/the-use-of-desflurane-for-neurosurgical-procedures-in-rhesus-macaque-macaca-mulatta
#8
Henri Gmj Bertrand, Charlotte Sandersen, Paul A Flecknell
Volatile agents are widely used to anaesthetise laboratory non-human primates as they allow a rapid induction and recovery as well as an easy adjustment of the anaesthesia plan. Desflurane is currently the volatile agent with the lowest solubility in blood, and hence enables the most rapid onset of anaesthesia and most rapid recovery. This study aimed to investigate the suitability of desflurane for maintenance of general anaesthesia in rhesus macaques undergoing elective experimental neurosurgery. Fourteen primates (five males and nine females) were sedated with ketamine (10 mg kg(-1)) and anaesthesia was induced with propofol (usually 8 mg kg(-1) IV)...
January 1, 2017: Laboratory Animals
https://www.readbyqxmd.com/read/29131536/non-invasive-ventilation-use-in-status-asthmaticus-16%C3%A2-years-of-experience-in-a-tertiary-intensive-care
#9
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/29118858/characteristics-and-predictors-of-mortality-of-patients-with-hematologic-malignancies-requiring-invasive-mechanical-ventilation
#10
Hasan M Al-Dorzi, Haya Al Orainni, Faten Al Eid, Haytham Tlayjeh, Abedalrahman Itani, Ayman Al Hejazi, Yaseen M Arabi
RATIONALE: Acute respiratory failure (ARF) may complicate the course of hematologic malignancies (HMs). Our objective was to study the characteristics, outcomes and predictors of mortality of patients with HMs who required intubation for ARF. METHODS: This retrospective cohort study evaluated all patients with HMs who were admitted to the Intensive Care Unit (ICU) of King Abdul-Aziz Medical City-Riyadh between 2008 and 2013 and required invasive mechanical ventilation...
October 2017: Annals of Thoracic Medicine
https://www.readbyqxmd.com/read/29118026/carbon-monoxide-in-lung-cell-physiology-and-disease
#11
Stefan W Ryter, Kevin C Ma, Augustine M K Choi
Carbon monoxide (CO) is an endogenously produced gas that has gained recognition as a biological signal transduction effector with properties similar, but not identical, to that of nitric oxide (NO). CO, which binds primarily to heme iron, may activate the hemoprotein guanylate cyclase (sGC), although with lower potency than NO. Furthermore, CO can modulate the activities of several cellular signaling molecules such as p38 MAPK, ERK1/2, JNK, AKT, NF-κB, and others. Emerging studies suggest that mitochondria, the energy-generating organelle of cells, represent a key target of CO action in eukaryotes...
November 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29117063/effect-of-dexmedetomidine-on-lactate-clearance-in-patients-with-septic-shock-a-sub-analysis-of-a-multicenter-randomized-controlled-trial
#12
Kyohei Miyamoto, Tsuyoshi Nakashima, Nozomu Shima, Seiya Kato, Kentaro Ueda, Yu Kawazoe, Yoshinori Ohta, Takeshi Morimoto, Hitoshi Yamamura
Lactate clearance is useful to guide initial resuscitation of patients with septic shock. We conducted this study to evaluate whether dexmedetomidine increases lactate clearance in patients with septic shock. This was a randomized controlled trial that involved a post hoc subgroup analysis. Adult patients with septic shock under ventilation were randomized to receive sedation strategy with or without dexmedetomidine (60 in the dexmedetomidine and 51 in the non-dexmedetomidine groups). The primary outcome was the lactate clearance at 6 h, defined as the percent decrease in lactate from randomization to 6 h after...
November 7, 2017: Shock
https://www.readbyqxmd.com/read/29116996/leptospirosis-in-icu-a-retrospective-study-of-134-consecutive-admissions
#13
Benjamin Delmas, Julien Jabot, Paul Chanareille, Cyril Ferdynus, Jérôme Allyn, Nicolas Allou, Loïc Raffray, Bernard-Alex Gaüzere, Olivier Martinet, David Vandroux
OBJECTIVES: Leptospirosis causes reversible multiple organ failure, and its mortality remains high. The aim of this study was to determine the mortality rate of leptospirosis in an ICU offering all types of organ support available nowadays and to compare it with mortality in bacterial sepsis. DESIGN: Retrospective, descriptive, and single-center cohort study. SETTINGS: The largest ICU of Reunion Island (Indian Ocean) in a teaching hospital...
November 7, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/29102342/bioengineered-lungs-a-challenge-and-an-opportunity
#14
Ramon Farré, Jordi Otero, Isaac Almendros, Daniel Navajas
Lung biofabrication is a new tissue engineering and regenerative development aimed at providing organs for potential use in transplantation. Lung biofabrication is based on seeding cells into an acellular organ scaffold and on culturing them in an especial purpose bioreactor. The acellular lung scaffold is obtained by decellularizing a non-transplantable donor lung by means of conventional procedures based on application of physical, enzymatic and detergent agents. To avoid immune recipient's rejection of the transplanted bioengineered lung, autologous bone marrow/adipose tissue-derived mesenchymal stem cells, lung progenitor cells or induced pluripotent stem cells are used for biofabricating the bioengineered lung...
November 1, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/29101346/development-and-validation-of-a-multi-algorithm-analytic-platform-to-detect-off-target-mechanical-ventilation
#15
Jason Y Adams, Monica K Lieng, Brooks T Kuhn, Greg B Rehm, Edward C Guo, Sandra L Taylor, Jean-Pierre Delplanque, Nicholas R Anderson
Healthcare-specific analytic software is needed to process the large volumes of streaming physiologic waveform data increasingly available from life support devices such as mechanical ventilators. Detection of clinically relevant events from these data streams will advance understanding of critical illness, enable real-time clinical decision support, and improve both clinical outcomes and patient experience. We used mechanical ventilation waveform data (VWD) as a use case to address broader issues of data access and analysis including discrimination between true events and waveform artifacts...
November 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29097629/increased-respiratory-neural-drive-and-work-of-breathing-in-exercise-induced-laryngeal-obstruction
#16
Emil Schwarz Walsted, Azmy Faisal, Caroline J Jolley, Laura L Swanton, Matthew J Pavitt, Yuan-Ming Luo, Vibeke Backer, Michael I Polkey, James H Hull
Rationale: Exercise induced laryngeal obstruction (EILO), a phenomenon in which the larynx closes inappropriately during physical activity, is a prevalent cause of exertional dyspnea in young individuals. The physiological ventilatory impact of EILO and its relationship to dyspnea are poorly understood. Objectives: To evaluate exercise related changes in laryngeal aperture on ventilation, pulmonary mechanics and respiratory neural drive. Methods: We prospectively evaluated 12 subjects (six with EILO and six healthy age- and gender-matched controls)...
November 2, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29092656/effect-of-anemia-on-mortality-in-mechanically-ventilated-patients-with-chronic-obstructive-pulmonary-disease
#17
Shruti K Gadre, Aravdeep Singh Jhand, Sami Abuqayyas, Xiaofeng Wang, Jorge Guzman, Abhijit Duggal
RATIONALE: The effect of anemia on patients with chronic obstructive pulmonary disease (COPD) requiring invasive mechanical ventilation for acute respiratory failure is unknown. OBJECTIVES: To examine the association between anemia (hemoglobin <12 g/dL) and 90-day and overall mortality in patients with COPD having acute respiratory failure requiring invasive mechanical ventilation. METHODS: Retrospective study of patients admitted to a quaternary referral medical intensive care unit (ICU) between October 2007 and December 2012 with a diagnosis of COPD and requiring invasive mechanical ventilation for acute respiratory failure of any cause...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/29084178/comparative-morphology-transcription-and-proteomics-study-revealing-the-key-molecular-mechanism-of-camphor-on-the-potato-tuber-sprouting-effect
#18
Li-Qin Li, Xue Zou, Meng-Sheng Deng, Jie Peng, Xue-Li Huang, Xue Lu, Chen-Cheng Fang, Xi-Yao Wang
Sprouting regulation in potato tubers is important for improving commercial value and producing new plants. Camphor shows flexible inhibition of tuber sprouting and prolongs the storage period of potato, but its underlying mechanism remains unknown. The results of the present study suggest that camphor inhibition caused bud growth deformities and necrosis, but after moving to more ventilated conditions, new sprouts grew from the bud eye of the tuber. Subsequently, the sucrose and fructose contents as well as polyphenol oxidase (PPO) activity were assessed after camphor inhibition...
October 30, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29077677/a-multicenter-evaluation-of-the-optimal-timing-of-surgical-stabilization-of-rib-fractures
#19
Fredric M Pieracci, Julia Coleman, Francis Ali-Osman, Alicia Mangram, Sarah Majercik, Thomas W White, Elan Jeremitsky, Andrew R Doben
INTRODUCTION: The optimal timing of surgical stabilization of rib fractures (SSRF) remains debated. We hypothesized that 1) demographic, radiologic, and clinical variables are associated with time to surgery and 2), shorter time to SSRF improves acute outcomes. METHODS: Prospectively collected SSRF databases from four trauma centers were merged and analyzed (2006-2016). The independent variable was days from hospital admission to SSRF [early (< 1 day), mid (1-2 days), and late (3-10 days)]...
October 25, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29066604/the-control-of-ventilation-during-exercise-a-lesson-in-critical-thinking
#20
Richard M Bruce
Learning the basic competencies of critical thinking are very important in the education of any young scientist, and teachers must be prepared to help students develop a valuable set of analytic tools. In my experience, this is best achieved by encouraging students to study areas with little scientific consensus, such as the control mechanisms of the exercise ventilatory response, as it can allow greater objectivity when evaluating evidence, while also giving students the freedom to think independently and problem solve...
December 1, 2017: Advances in Physiology Education
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