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mechanical ventilation physiology

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https://www.readbyqxmd.com/read/28725211/critical-evaluation-of-the-lund-concept-for-treatment-of-severe-traumatic-head-injury-25%C3%A2-years-after-its-introduction
#1
REVIEW
Per-Olof Grände
When introduced in 1992, the Lund concept (LC) was the first complete guideline for treatment of severe traumatic brain injury (s-TBI). It was a theoretical approach, based mainly on general physiological principles-i.e., of brain volume control and optimization of brain perfusion and oxygenation of the penumbra zone. The concept gave relatively strict outlines for cerebral perfusion pressure, fluid therapy, ventilation, sedation, nutrition, the use of vasopressors, and osmotherapy. The LC strives for treatment of the pathophysiological mechanisms behind symptoms rather than just treating the symptoms...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28721821/current-perspectives-for-the-use-of-gonane-progesteronergic-drugs-in-the-treatment-of-central-hypoventilation-syndromes
#2
Camille Loiseau, Florence Cayetanot, Fanny Joubert, Anne-Sophie Perrin-Terrin, Philippe Cardot, Marie-Noëlle Fiamma, Alain Frugiere, Christian Straus, Laurence Bodineau
BACKGROUND: Central alveolar hypoventilation syndromes (CHS) encompass neurorespiratory diseases resulting from congenital or acquired neurological disorders. Hypercapnia, acidosis, and hypoxemia resulting from CHS negatively affect physiological functions and can be life-threatening. To date, the absence of pharmacological treatment implies that the patients must receive assisted ventilation throughout their lives. OBJECTIVE: To highlight the relevance of determining conditions in which using gonane synthetic progestins could be of potential clinical interest for the treatment of CHS...
July 19, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28711381/effectiveness-assessment-of-a-guideline-based-protocol-for-ventilatory-support-management-of-copd-exacerbations-in-an-emergency-department
#3
Franciele Plachi, Fernando Nataniel Vieira, Danilo Cortozi Berton, Marli Knorst, Alexandre Simões Dias, Fernanda Machado Balzan
OBJECTIVES: To investigate clinical outcomes according to ventilatory support indication in subjects with chronic obstructive pulmonary disease exacerbation in a "real-life" Emergency Department and to analyze potential predictors of successful noninvasive positive pressure ventilation. METHODS: Retrospective cohort performed over an 18-month period, comparing the following patient groups with chronic obstructive pulmonary disease exacerbation: Group A composed of patients initially selected to receive noninvasive positive pressure ventilation without the subsequent need for invasive mechanical ventilation (successful-noninvasive positive pressure ventilation); Group B composed of patients transitioning from noninvasive positive pressure ventilation to invasive mechanical ventilation (failed-noninvasive positive pressure ventilation); and Group C composed of patients who presented with immediate need for invasive mechanical ventilation (without prior noninvasive positive pressure ventilation)...
July 5, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28710988/intestinal-fatty-acid-binding-protein-level-as-a-predictor-of-28-day-mortality-and-bowel-ischemia-in-patients-with-septic-shock-a-preliminary-study
#4
Motohiro Sekino, Hiroyuki Funaoka, Shuntaro Sato, Kyoko Okada, Haruka Inoue, Rintaro Yano, Sojiro Matsumoto, Taiga Ichinomiya, Ushio Higashijima, Shuhei Matsumoto, Tetsuya Hara
PURPOSE: We sought to evaluate the levels of intestinal fatty acid-binding protein (I-FABP), a biomarker of enterocyte injury, as a predictor of 28-day mortality and bowel ischemia in septic shock patients. MATERIAL AND METHODS: In this preliminary prospective observational study, 57 adult septic shock patients under mechanical ventilation were enrolled. Serum I-FABP levels and prognostic biomarkers were recorded upon intensive care unit (ICU) admission. RESULTS: The overall 28-day mortality rate of participants was 23% (13/57)...
July 6, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28709443/severity-of-acute-gastrointestinal-injury-grade-is-a-predictor-of-all-cause-mortality-in-critically-ill-patients-a-multicenter-prospective-observational-study
#5
Bangchuan Hu, Renhua Sun, Aiping Wu, Yin Ni, Jingquan Liu, Feng Guo, Lijun Ying, Guoping Ge, Aijun Ding, Yunchao Shi, Changwen Liu, Lei Xu, Ronglin Jiang, Jun Lu, Ronghai Lin, Yannan Zhu, Weidong Wu, Bo Xie
BACKGROUND: In 2012, the European Society of Intensive Care Medicine proposed a definition for acute gastrointestinal injury (AGI) based on current medical evidence and expert opinion. The aim of the present study was to evaluate the feasibility of using the current AGI grading system and to investigate the association between AGI severity grades with clinical outcome in critically ill patients. METHODS: Adult patients at 14 general intensive care units (ICUs) with an expected ICU stay ≥24 h were prospectively studied...
July 14, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28707173/intraoperative-ventilation-of-morbidly-obese-patients-guided-by-transpulmonary-pressure
#6
Lars Eichler, Katarzyna Truskowska, A Dupree, P Busch, Alwin E Goetz, Christian Zöllner
BACKGROUND: Bariatric surgery has proven a successful approach in the treatment of morbid obesity and its concomitant diseases such as diabetes mellitus and arterial hypertension. Aiming for optimal management of this challenging patient cohort, tailored concepts directly guided by individual patient physiology may outperform standardized care. Implying esophageal pressure measurement and electrical impedance tomography-increasingly applied monitoring approaches to individually adjust mechanical ventilation in challenging circumstances like acute respiratory distress syndrome (ARDS) and intraabdominal hypertension-we compared our institutions standard ventilator regimen with an individually adjusted positive end expiratory pressure (PEEP) level aiming for a positive transpulmonary pressure (P L) throughout the respiratory cycle...
July 14, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28701840/colistin-nephrotoxicity-in-adults-single-centre-large-series-from-india
#7
Abdul Ghafur, Swati Gohel, Vidyalakshmi Devarajan, T Raja, Jose Easow, M A Raja, Sankar Sreenivas, Balasubramaniam Ramakrishnan, T Ramakrishnan, S G Raman, Dedeepiya Devaprasad, Balaji Venkatachalam, Ramesh Nimmagadda
CONTEXT: Limited Indian data are available on the rate of colistin nephrotoxicity and other risk factors contributing to the development of this important side effect. AIM: This study aims to generate data on colistin nephrotoxicity from a large cohort of Indian patients. DESIGN: Retrospective cohort study. MATERIALS AND METHODS: Case record analysis of patients who received colistin, in an oncology center in India, between January 2011 and December 2015...
June 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28698265/risk-factors-for-noninvasive-ventilation-failure-in-critically-ill-subjects-with-confirmed-influenza-infection
#8
Alejandro Rodríguez, Cristina Ferri, Ignacio Martin-Loeches, Emili Díaz, Joan R Masclans, Federico Gordo, Jordi Sole-Violán, María Bodí, Francesc X Avilés-Jurado, Sandra Trefler, Monica Magret, Gerard Moreno, Luis F Reyes, Judith Marin-Corral, Juan C Yebenes, Andres Esteban, Antonio Anzueto, Stefano Aliberti, Marcos I Restrepo
BACKGROUND: Despite wide use of noninvasive ventilation (NIV) in several clinical settings, the beneficial effects of NIV in patients with hypoxemic acute respiratory failure (ARF) due to influenza infection remain controversial. The aim of this study was to identify the profile of patients with risk factors for NIV failure using chi-square automatic interaction detection (CHAID) analysis and to determine whether NIV failure is associated with ICU mortality. METHODS: This work was a secondary analysis from prospective and observational multi-center analysis in critically ill subjects admitted to the ICU with ARF due to influenza infection requiring mechanical ventilation...
July 11, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28690548/optimization-of-variable-ventilation-for-physiology-immune-response-and-surfactant-enhancement-in-preterm-lambs
#9
Erzsébet Bartolák-Suki, Peter B Noble, Samer Bou Jawde, Jane J Pillow, Béla Suki
Preterm infants often require mechanical ventilation due to lung immaturity including reduced or abnormal surfactant. Since cyclic stretch with cycle-by-cycle variability is known to augment surfactant release by epithelial cells, we hypothesized that such in vivo mechanotransduction improves surfactant maturation and hence lung physiology in preterm subjects. We thus tested whether breath-by-breath variability in tidal volume (VT) in variable ventilation (VV) can be tuned for optimal performance in a preterm lamb model...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28684287/high-frequency-oscillatory-ventilation-in-adults-with-ards-past-present-and-future
#10
REVIEW
Michael C Sklar, Eddy Fan, Ewan C Goligher
High-frequency oscillatory ventilation (HFOV) is a unique mode of mechanical ventilation that utilizes non-conventional gas exchange mechanisms to deliver ventilation at very low tidal volumes and high frequencies. The properties of HFOV make it a potentially ideal mode to prevent ventilator-induced lung injury in patients with acute respiratory distress syndrome. Despite a compelling physiological basis and promising experimental data, large randomized controlled trials have not detected an improvement in survival with the use of HFOV; the use of HFOV as an early lung-protective strategy in patients with ARDS may be harmful...
July 3, 2017: Chest
https://www.readbyqxmd.com/read/28682838/characteristics-and-outcome-of-cancer-patients-admitted-to-the-icu-in-england-wales-and-northern-ireland-and-national-trends-between-1997-and-2013
#11
Marlies Ostermann, Paloma Ferrando-Vivas, Carmen Gore, Sarah Power, David Harrison
OBJECTIVE: To describe trends in outcomes of cancer patients with an unplanned admission to the ICU between 1997 and 2013 and to identify risk factors for mortality of those admitted between 2009 and 2013. DESIGN: Retrospective analysis. SETTING: Intensive Care National Audit & Research Centre Case Mix Programme Database including data of ICUs in England, Wales, and Northern Ireland. PATIENTS: Patients (99,590) with a solid tumor and 13,538 patients with a hematological malignancy with an unplanned ICU admission between 1997 and 2013; 39,734 solid tumor patients and 6,652 patients with a hematological malignancy who were admitted between 2009 and 2013 were analyzed in depth...
July 4, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28679570/cardiopulmonary-physiology-why-the-heart-and-lungs-are-inextricably-linked
#12
Kevin Verhoeff, Jamie R Mitchell
Because the heart and lungs are confined within the thoracic cavity, understanding their interactions is integral for studying each system. Such interactions include changes in external constraint to the heart, blood volume redistribution (venous return), direct ventricular interaction (DVI), and left ventricular (LV) afterload. During mechanical ventilation, these interactions can be amplified and result in reduced cardiac output. For example, increased intrathoracic pressure associated with mechanical ventilation can increase external constraint and limit ventricular diastolic filling and, therefore, output...
September 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/28673010/rhubarb-vs-glycerin-enema-for-treatment-of-critically-ill-patients-with-intra-abdominal-hypertension
#13
Bing Wan, Hao Zhang, Jiangtao Yin, Haiyan Fu, Yikun Chen, Liping Yang, Dadong Liu, Tangfeng Lv, Yong Song
Rhubarb has been used as an evacuant for thousands of years. However, recent research has indicated that rhubarb inhibits inflammation and protects organ function. In the current study, the use of rhubarb was investigated in patients with intra-abdominal hypertension (IAH). Specifically, its dual role in attenuating lung and bowel injury by catharsis and inhibiting inflammation was evaluated. Patients in the glycerin group (n=56) received 110 ml of glycerin enema by coloclysis once daily for 7 to 9 days. Patients in the rhubarb group (n=56) were treated with a mixture of 0...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28671163/predictors-of-mortality-of-severe-sepsis-among-adult-patients-in-the-medical-intensive-care-unit
#14
Aziz Kallikunnel Sayed Mohamed, Asmita Anilkumar Mehta, Ponneduthamkuzhy James
BACKGROUND: Sepsis is an important cause of mortality in the Intensive Care Units (ICUs) worldwide. Information regarding early predictive factors for mortality and morbidity is limited. AIMS AND OBJECTIVES: The primary objective of the study was to estimate the mortality of severe sepsis among adult patients admitted into the medical ICU. The secondary objective was to identify the predictors associated with mortality. MATERIALS AND METHODS: Adult patients admitted with severe sepsis in the medical ICU were studied...
July 2017: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/28668914/safety-and-acceptability-of-patient-administered-sedatives-during-mechanical-ventilation
#15
Linda L Chlan, Debra J Skaar, Mary F Tracy, Sarah M Hayes, Breanna D Hetland, Kay Savik, Craig R Weinert
BACKGROUND: Safety and acceptability of sedative self-administration by patients receiving mechanical ventilation is unknown. OBJECTIVES: To determine if self-administration of dexmedetomidine by patients is safe and acceptable for self-management of anxiety during ventilatory support. METHODS: In a pilot trial in 3 intensive care units, 17 intubated patients were randomly assigned to dexmedetomidine and 20 to usual care. Dexmedetomidine was administered via standard pumps for patient-controlled analgesia, with a basal infusion (0...
July 2017: American Journal of Critical Care: An Official Publication, American Association of Critical-Care Nurses
https://www.readbyqxmd.com/read/28668768/low-brain-tissue-oxygenation-contributes-to-the-development-of-delirium-in-critically-ill-patients-a-prospective-observational-study
#16
Michael D Wood, David M Maslove, John G Muscedere, Andrew G Day, J Gordon Boyd
PURPOSE: To test the hypothesis that poor brain tissue oxygenation (BtO2) during the first 24h of critical illness correlates with the proportion of time spent delirious. We also sought to define the physiological determinants of BtO2. MATERIALS AND METHODS: Adult patients admitted to the ICU within the previous 24h were considered eligible for enrollment if they required mechanical ventilation, and/or vasopressor support. BtO2 was measured using near-infrared spectroscopy, for 24h after enrollment...
June 15, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28664851/clinical-trials-in-acute-respiratory-distress-syndrome-challenges-and-opportunities
#17
REVIEW
Michael A Matthay, Daniel F McAuley, Lorraine B Ware
This year is the 50th anniversary of the first description of acute respiratory distress syndrome (ARDS). Since then, much has been learned about the pathogenesis of lung injury in ARDS, with an emphasis on the mechanisms of injury to the lung endothelium and the alveolar epithelium. In terms of treatment, major progress has been made in reducing mortality from ARDS with lung-protective ventilation, using a tidal volume of 6 mL per kg of predicted bodyweight and a plateau airway pressure of less than 30 cm H2O...
June 2017: Lancet Respiratory Medicine
https://www.readbyqxmd.com/read/28653135/closed-loop-mechanical-ventilation-for-lung-injury-a-novel-physiological-feedback-mode-following-the-principles-of-the-open-lung-concept
#18
David Schwaiberger, Philipp A Pickerodt, Anake Pomprapa, Onno Tjarks, Felix Kork, Willehad Boemke, Roland C E Francis, Steffen Leonhardt, Burkhard Lachmann
Adherence to low tidal volume (VT) ventilation and selected positive end-expiratory pressures are low during mechanical ventilation for treatment of the acute respiratory distress syndrome. Using a pig model of severe lung injury, we tested the feasibility and physiological responses to a novel fully closed-loop mechanical ventilation algorithm based on the "open lung" concept. Lung injury was induced by surfactant washout in pigs (n = 8). Animals were ventilated following the principles of the "open lung approach" (OLA) using a fully closed-loop physiological feedback algorithm for mechanical ventilation...
June 26, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28650070/the-human-ventilatory-response-to-stress-rate-or-depth
#19
Michael J Tipton, Abbi Harper, Julian F R Paton, Joseph T Costello
Many stressors cause an increase in ventilation in humans. This is predominantly reported as an increase in minute ventilation (V̇E ). But, the same V̇E can be achieved by a wide variety of changes in the depth (tidal volume, VT ) and number of breaths (respiratory frequency, ƒR). This review investigates the impact of stressors including: cold, heat, hypoxia, pain and panic on the contributions of ƒR and VT to V̇E to see if they differ with different stressors. Where possible we also consider the potential mechanisms that underpin the responses identified, and propose mechanisms by which differences in ƒR and VT are mediated...
June 26, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28641754/ventilation-modalities-in-infants-with-congenital-diaphragmatic-hernia
#20
Francesco Morini, Irma Capolupo, Willem van Weteringen, Irwin Reiss
Neonates with congenital diaphragmatic hernia are among the more complex patients to support with mechanical ventilation. They have particular features that add to the difficulties already present in the neonatal patient. A ventilation strategy tailored to the patient's underlying physiology rather than mode of ventilation is a crucial issue for clinicians treating these delicate patients.
June 2017: Seminars in Pediatric Surgery
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