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hypoxemia mechanism

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https://www.readbyqxmd.com/read/29676798/afferent-neural-feedback-overrides-the-modulating-effects-of-arousal-hypercapnia-and-hypoxemia-on-neonatal-cardio-respiratory-control
#1
Kathleen J Lumb, Jennifer M Schneider, Thowfique Ibrahim, Anita Rigaux, Shabih U Hasan
KEY POINTS: Evidence at whole animal, organ-system, and cellular and molecular levels suggests that afferent volume feedback is critical for establishment of adequate ventilation at birth. Due to the irreversible nature of vagal ablation studies to date, it was difficult to quantify the roles of afferent volume input, arousal and changes in blood gas tensions on neonatal respiratory control. During reversible perineural vagal block, profound apneas, and hypoxemia and hypercarbia were observed necessitating termination of perineural blockade...
April 20, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29620011/ictal-laryngospasm-monitored-by-video-eeg-and-polygraphy-a-potential-sudep-mechanism
#2
Nuria Lacuey, Laura Vilella, Johnson P Hampson, Jayakumar Sahadevan, Samden D Lhatoo
A 56-year-old man with refractory bitemporal epilepsy was monitored in the Epilepsy Monitoring Unit (EMU). In a video-EEG captured seizure, brief oroalimentary automatisms were followed by increased inspiratory effort, accompanied by prominent, visible tracheal movements and audible inspiratory stridor. The patient's oxygen saturation rapidly declined to 62%; persistent severe hypoxemia ended with spontaneous effective respiration commencing at seizure end. Subsequent seizures necessitated intensive care unit admission for respiratory distress, and ventilator support...
April 5, 2018: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/29616915/refractory-hypoxemia-in-a-patient-with-submassive-pulmonary-embolism-and-an-intracardiac-shunt-a-case-report-and-review-of-the-literature
#3
REVIEW
Jean Liew, Janelle Stevens, Christopher Slatore
INTRODUCTION: Acute pulmonary embolism is the third leading cause of cardiovascular death. Management options include anticoagulation with or without thrombolysis. Concurrent persistent hypoxemia should be a clue to the existence of an intracardiac shunt. CASE PRESENTATION: A 46-year-old man experienced acute hypoxemic respiratory failure requiring mechanical ventilation after anesthesia induction for elective hip arthroplasty. He was found to have submassive bilateral pulmonary emboli with acute right ventricular dysfunction and a coexisting patent foramen ovale with right-to-left shunt...
March 2, 2018: Permanente Journal
https://www.readbyqxmd.com/read/29607238/pulmonary-alveolar-proteinosis-in-setting-of-inhaled-toxin-exposure-and-chronic-substance-abuse
#4
Meirui Li, Salem Alowami, Miranda Schell, Clive Davis, Asghar Naqvi
Pulmonary alveolar proteinosis (PAP) is a rare lung disorder in which defects in alveolar macrophage maturation or function lead to the accumulation of proteinaceous surfactant in alveolar space, resulting in impaired gas exchange and hypoxemia. PAP is categorized into three types: hereditary, autoimmune, and secondary. We report a case of secondary PAP in a 47-year-old man, whose risk factors include occupational exposure to inhaled toxins, especially aluminum dust, the use of anabolic steroids, and alcohol abuse, which in mice leads to alveolar macrophage dysfunction through a zinc-dependent mechanism that inhibits granulocyte macrophage-colony stimulating factor (GM-CSF) receptor signalling...
2018: Case Reports in Pulmonology
https://www.readbyqxmd.com/read/29605194/acute-eosinophilic-pneumonia-in-the-deployed-military-setting
#5
Christy R Sine, Paul D Hiles, Stephanie L Scoville, Ralph L Haynes, Patrick F Allan, Teri J Franks, Michael J Morris, Erik C Osborn
RATIONALE: Acute eosinophilic pneumonia (AEP) is a rare but important cause of severe respiratory failure most typically caused by cigarette smoking, but can also be caused by medications, illicit drugs, infections and environmental exposures. There is growing evidence that disease severity varies and not all patients require mechanical ventilation or even supplemental oxygen. OBJECTIVES: To compare patients with AEP treated at Landstuhl Regional Medical Center (LRMC) to those in other published series, and to provide recommendations regarding diagnosis and treatment of AEP...
April 2018: Respiratory Medicine
https://www.readbyqxmd.com/read/29599604/review-article-update-on-current-and-emergent-data-on-hepatopulmonary-syndrome
#6
REVIEW
Stergios Soulaidopoulos, Evangelos Cholongitas, George Giannakoulas, Maria Vlachou, Ioannis Goulis
Hepatopulmonary syndrome (HPS) is a frequent pulmonary complication of end-stage liver disease, characterized by impaired arterial oxygenation induced by intrapulmonary vascular dilatation. Its prevalence ranges from 4% to 47% in patients with cirrhosis due to the different diagnostic criteria applied among different studies. Nitric oxide overproduction and angiogenesis seem to be the hallmarks of a complicated pathogenetic mechanism, leading to intrapulmonary shunting and ventilation-perfusion mismatch. A classification of HPS according to the severity of hypoxemia has been suggested...
March 28, 2018: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29599422/fatal-acute-respiratory-distress-syndrome-due-to-influenza-a-h1n1-infection-in-patients-after-kidney-transplantation-a-report-of-five-cases
#7
Paweł Zatorski, Agata Adamczyk, Maciej Kosieradzki, Teresa Baczkowska, Dariusz Kosson, Janusz Trzebicki
BACKGROUND In the general population, swine influenza is a self-limited infection. Patients after kidney transplantation, however, are at increased risk for complications and mortality from influenza A (H1N1). Acute respiratory distress syndrome (ARDS) complicates up to 55% of influenza-related pneumonia in hospitalized patients and carries a mortality of 40-46%. We describe our experience in intensive care of kidney transplant patients with ARDS complicating influenza A (H1N1) pneumonia during a flu outbreak...
March 30, 2018: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/29582175/exogenous-surfactant-as-a-bridge-to-prolonged-total-lung-rest-in-severely-injured-patient-during-extracorporeal-membrane-oxygenation
#8
Peter Sklienka, Jan Maca, Filip Bursa, Jan Neiser, Roman Kula, Marcela Kanova, Tomas Danek, Pavel Sevcik
We report a case of a 20-year-old male patient suffering from motorcycle accident complicated by rapid development of severe refractory hypoxemia and hypercapnia due to serious bilateral lung contusions and lacerations. Positive pressure mechanical ventilation induced pressure-dependent massive air leak from disrupted pulmonary tissue. Simultaneous implementation of veno-venous extracorporeal membrane oxygenation together with surfactant application allowed prolonged disconnection of patient from mechanical ventilation ("total lung rest" mode)...
March 27, 2018: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/29579597/physiological-insights-of-exercise-hyperventilation-in-arterial-and-chronic-thromboembolic-pulmonary-hypertension
#9
Stefania Farina, Noemi Bruno, Cecilia Agalbato, Mauro Contini, Roberto Cassandro, Davide Elia, Sergio Harari, Piergiuseppe Agostoni
BACKGROUND: Pulmonary hypertension (PH) patients show, during exercise, an excessive increase in ventilation (VE ) compared to carbon dioxide output (VCO2 ), determining a high VE /VCO2 slope. There are several possible causes, including an elevated dead space ventilation (VD ), VE /perfusion (Q) mismatch and/or an enhanced peripheral or central chemoreceptor activity. We evaluated the causes of exercise hyperventilation in PH patients. METHODS: Eighteen group I and IV PH patients underwent cardiopulmonary exercise test with blood gas analysis at every minute...
May 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29576824/ventilator-management-for-acute-respiratory-distress-syndrome-associated-with-avian-influenza-a-h7n9-virus-infection-a-case-series
#10
Hui Xie, Zhi-Gang Zhou, Wei Jin, Cheng-Bin Yuan, Jiang Du, Jian Lu, Rui-Lan Wang
BACKGROUND: Data on the mechanical ventilation (MV) characteristics and radiologic features for the cases with H7N9-induced ARDS were still lacking. METHODS: We describe the MV characteristics and radiologic features of adult patients with ARDS due to microbiologically confirmed H7N9 admitted to our ICU over a 3-month period. RESULTS: Eight patients (mean age 57.38±16.75; 5 male) were diagnosed with H7N9 in the first quarter of 2014. All developed respiratory failure complicated by acute respiratory distress syndrome (ARDS), which required MV in ICU...
2018: World Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29566734/acute-exacerbation-of-idiopathic-pulmonary-fibrosis-lessons-learned-from-acute-respiratory-distress-syndrome
#11
REVIEW
Alessandro Marchioni, Roberto Tonelli, Lorenzo Ball, Riccardo Fantini, Ivana Castaniere, Stefania Cerri, Fabrizio Luppi, Mario Malerba, Paolo Pelosi, Enrico Clini
Idiopathic pulmonary fibrosis (IPF) is a fibrotic lung disease characterized by progressive loss of lung function and poor prognosis. The so-called acute exacerbation of IPF (AE-IPF) may lead to severe hypoxemia requiring mechanical ventilation in the intensive care unit (ICU). AE-IPF shares several pathophysiological features with acute respiratory distress syndrome (ARDS), a very severe condition commonly treated in this setting.A review of the literature has been conducted to underline similarities and differences in the management of patients with AE-IPF and ARDS...
March 23, 2018: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29564137/regional-overdistension-during-prone-positioning-in-a-patient-with-acute-respiratory-failure-who-was-ventilated-with-a-low-tidal-volume-a-case-report
#12
Toru Kotani, Masanori Hanaoka, Shinya Hirahara, Hisashi Yamanaka, Eckhard Teschner, Atsuko Shono
Background: Prone positioning may provide a uniform distribution of transpulmonary pressure and contribute to prevent ventilator-induced lung injury. However, despite moderate positive end-expiratory pressure and low tidal volumes, there is still a risk of regional overdistension. Case presentation: A man with refractory hypoxemia was mechanically ventilated with prone positioning. Although prone positioning with a plateau pressure of 18 cmH2 O and a positive end-expiratory pressure of 8 cmH2 O promptly improved oxygenation, regional ventilation monitoring using electrical impedance tomography initially detected decreased distribution in the dorsal region but increased in the ventral, suggesting overdistension...
2018: Journal of Intensive Care
https://www.readbyqxmd.com/read/29547003/home-oxygen-in-chronic-obstructive-pulmonary-disease
#13
Yves Lacasse, Ai-Yui M Tan, François Maltais, Jerry A Krishnan
Two landmark trials conducted more than 35 years ago provided scientific evidence that, under very specific circumstances, long-term oxygen therapy (LTOT) may prolong life. These two trials enrolled 290 patients with chronic obstructive pulmonary disease (COPD) and severe daytime hypoxemia documented by direct arterial blood gas measurement. From this moment, LTOT became a standard of care and the indications for oxygen therapy have expanded to include nocturnal oxygen therapy for isolated nocturnal oxygen desaturation, ambulatory oxygen to correct exercise-induced desaturation, and short-burst oxygen to relieve dyspnea...
March 16, 2018: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/29523157/neuromuscular-blockade-is-associated-with-the-attenuation-of-biomarkers-of-epithelial-and-endothelial-injury-in-patients-with-moderate-to-severe-acute-respiratory-distress-syndrome
#14
Peter D Sottile, David Albers, Marc M Moss
BACKGROUND: Neuromuscular blockade (NMB) is a therapy for acute respiratory distress syndrome (ARDS). However, the mechanism by which NMB may improve outcome for ARDS patients remains unclear. We sought to determine whether NMB attenuates biomarkers of epithelial and endothelial lung injury and systemic inflammation in ARDS patients, and whether the association is dependent on tidal volume size and the initial degree of hypoxemia. METHODS: We performed a secondary analysis of patients enrolled in the ARDS network low tidal volume ventilation (ARMA) study...
March 10, 2018: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29472044/guidelines-on-the-diagnosis-and-treatment-of-pulmonary-hypertension-summary-of-recommendations
#15
Joan Albert Barberà, Antonio Román, Miguel Ángel Gómez-Sánchez, Isabel Blanco, Remedios Otero, Raquel López-Reyes, Isabel Otero, Gregorio Pérez-Peñate, Ernest Sala, Pilar Escribano
Pulmonary hypertension is a hemodynamic disorder defined by abnormally high pulmonary artery pressure that can occur in numerous diseases and clinical situations. The causes of pulmonary hypertension are classified into 5 major groups: arterial, due to left heart disease, due to lung disease and/or hypoxemia, chronic thromboembolic, with unclear and/or multifactorial mechanisms. This is a brief summary of the Guidelines on the Diagnostic and Treatment of Pulmonary Hypertension of the Spanish Society of Pulmonology and Thoracic Surgery...
February 19, 2018: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/29466596/acute-respiratory-distress-syndrome-advances-in-diagnosis-and-treatment
#16
REVIEW
Eddy Fan, Daniel Brodie, Arthur S Slutsky
Importance: Acute respiratory distress syndrome (ARDS) is a life-threatening form of respiratory failure that affects approximately 200 000 patients each year in the United States, resulting in nearly 75 000 deaths annually. Globally, ARDS accounts for 10% of intensive care unit admissions, representing more than 3 million patients with ARDS annually. Objective: To review advances in diagnosis and treatment of ARDS over the last 5 years. Evidence Review: We searched MEDLINE, EMBASE, and the Cochrane Database of Systematic Reviews from 2012 to 2017 focusing on randomized clinical trials, meta-analyses, systematic reviews, and clinical practice guidelines...
February 20, 2018: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29434764/pediatric-acute-respiratory-distress-syndrome-current-views
#17
Jinfeng Liu, Wei Wang, Fengli Liu, Zhenguang Li
Acute respiratory distress syndrome (ARDS) mainly involves acute respiratory failure. In addition to this affected patients feel progressive arterial hypoxemia, dyspnea, and a marked increase in the work of breathing. The only clinical solution for the above pathological state is ventilation. Mechanical ventilation is necessary to support life in ARDs but it itself worsen lung injury and the term is known clinically as 'ventilation induced lung injury' (VILI). At the cellular level, respiratory epithelial cells are subjected to cyclic stretch, i...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29430449/new-insights-into-the-mechanisms-of-pulmonary-edema-in-acute-lung-injury
#18
REVIEW
Raquel Herrero, Gema Sanchez, Jose Angel Lorente
Appearance of alveolar protein-rich edema is an early event in the development of acute respiratory distress syndrome (ARDS). Alveolar edema in ARDS results from a significant increase in the permeability of the alveolar epithelial barrier, and represents one of the main factors that contribute to the hypoxemia in these patients. Damage of the alveolar epithelium is considered a major mechanism responsible for the increased pulmonary permeability, which results in edema fluid containing high concentrations of extravasated macromolecules in the alveoli...
January 2018: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29428971/emergence-of-anti-mitochondrial-m2-antibody-in-patient-with-angioimmunoblastic-t-cell-lymphoma
#19
Shun-Ichi Wakabayashi, Takefumi Kimura, Naoki Tanaka, Satoru Joshita, Kazuhito Kawata, Takeji Umemura, Yuki Hiroshima, Hiromitsu Mori, Hikaru Kobayashi, Shuichi Wada, Eiji Tanaka
A 68-year-old woman was referred to our hospital due to fever and rash on the neck and extremities. Laboratory findings revealed hepatic dysfunction and positivity for anti-mitochondrial M2 antibody (AMA-M2). Hepatosplenomegaly and systemic lymphadenopathy were detected by enhanced computed tomography. One week after her first visit, hypoxemia, ascites, and Coomb test-positive autoimmune hemolytic anemia had newly appeared in addition to worsened fever, hepatosplenomegaly, and lymphadenopathy. Results of axillary lymph node, skin, and bone-marrow biopsies led to the diagnosis of angioimmunoblastic T-cell lymphoma (AITL), for which CEPP therapy (cyclophosphamide, etoposide, procarbazine, and prednisolone) was initiated...
February 10, 2018: Clinical Journal of Gastroenterology
https://www.readbyqxmd.com/read/29399924/oesophageal-atresia-are-long-gap-patients-at-greater-anesthetic-risk
#20
Laura Powell, Jacinta Frawley, Joe Crameri, Warwick J Teague, Geoff P Frawley
BACKGROUND: Long gap oesophageal atresia occurs in approximately 10% of all oesophageal atresia infants and surgical repair is often difficult with significant postoperative complications. Our aim was to describe the perioperative course, morbidity, and early results following repair of long gap oesophageal atresia and to identify factors which may be associated with complications. METHODS: This is a single center retrospective cohort study of consecutive patients with oesophageal atresia undergoing surgical repair at The Royal Children's Hospital Melbourne from January 2006 to June 2017...
March 2018: Paediatric Anaesthesia
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