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1

Martin-Loeches, Ignacio, and Antonio Artigas. Respiratory support with positive end-expiratory pressure. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0094.

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Positive-end-expiratory pressure (PEEP) is the pressure present in the airway (alveolar pressure) above atmospheric pressure that exists at the end of expiration. The term PEEP is defined in two particular settings. Extrinsic PEEP (applied by ventilator) and intrinsic PEEP (PEEP caused by non-complete exhalation causing progressive air trapping). Applied (extrinsic) PEEP—is usually one of the first ventilator settings chosen when mechanical ventilation (MV) is initiated. Applying PEEP increases alveolar pressure and volume. The increased lung volume increases the surface area by reopening and
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2

Kreit, John W. Dynamic Hyperinflation and Intrinsic Positive End-Expiratory Pressure. Edited by John W. Kreit. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190670085.003.0010.

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Dynamic hyperinflation and intrinsic PEEP almost always occur in patients with severe obstructive lung disease, in whom slowing of expiratory flow prevents complete exhalation. Occasionally, patients without airflow obstruction develop dynamic hyperinflation when expiratory time, is excessively shortened by a rapid respiratory rate, a long set inspiratory time (TI), or both. Dynamic Hyperinflation and Intrinsic Positive End-Expiratory Pressure describes the causes of dynamic hyperinflation and the mechanisms of its adverse effects, including reduced cardiac output and blood pressure, pulmonary
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3

Sun, Crawford Ming. Study of blood-bone prostaglandin-like activity during positive end-expiratory pressure (PEEP) in anaesthetized dogs. 1986.

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4

Muders, Thomas, and Christian Putensen. Pressure-controlled mechanical ventilation. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0096.

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Beside reduction in tidal volume limiting peak airway pressure minimizes the risk for ventilator-associated-lung-injury in patients with acute respiratory distress syndrome. Pressure-controlled, time-cycled ventilation (PCV) enables the physician to keep airway pressures under strict limits by presetting inspiratory and expiratory pressures, and cycle times. PCV results in a square-waved airway pressure and a decelerating inspiratory gas flow holding the alveoli inflated for the preset time. Preset pressures and cycle times, and respiratory system mechanics affect alveolar and intrinsic positi
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5

Kiss, Thomas, and Paolo Pelosi. Lung recruitment techniques in the ICU. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0120.

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Lung recruitment manoeuvres (RMs) have been suggested as a means of homogenizing the lung structure and distribution of the mechanical stress across the lungs. Such effects can be achieved provided enough pressure is applied for enough time at the airways, and maintained if adequate levels of positive end-expiratory pressure (PEEP) are used. When RMs effectively open atelectatic tissue, shear stress, and cyclic collapse/reopening are importantly reduced. The lung response to RMs is mainly determined by cause and severity of lung injury, and the position of the lungs with respect to the gravity
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6

Kreit, John W. Cardiovascular–Pulmonary Interactions. Edited by John W. Kreit. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190670085.003.0003.

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Intramural pressures within a tube or circuit determine the rate and direction of flow, whereas the transmural pressure of an elastic structure determines its volume. In Chapter 1, we applied these principles when talking about the pressure needed to overcome viscous forces and elastic recoil during ventilation. In this chapter, we use them to explain changes in blood flow between two portions of the circulatory system and changes in the volume and size of the heart chambers. Cardio–Pulmonary Interactions provides an overview of essential cardiovascular physiology as well as an in-depth discus
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7

Lucangelo, Umberto, and Massimo Ferluga. Pulmonary mechanical dysfunction in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0084.

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In intensive care units practitioners are confronted every day with mechanically-ventilated patients and should be able to sort out from all the data available from modern ventilators to tailored patient ventilatory strategy. Real-time visualization of pressure, flow and tidal volume provide valuable information on the respiratory system, to optimize ventilatory support and avoiding complications associated with mechanical ventilation. Early determination of patient–ventilator asynchrony, air-trapping, and variation in respiratory parameters is important during mechanical ventilation. A correc
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8

Kreit, John W. Respiratory Mechanics. Edited by John W. Kreit. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190670085.003.0001.

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Ventilation can occur only when the respiratory system expands above and then returns to its resting or equilibrium volume. This is just another way of saying that ventilation depends on our ability to breathe. Although breathing requires very little effort and even less thought, it’s nevertheless a fairly complex process. Respiratory Mechanics reviews the interaction between applied and opposing forces during spontaneous and mechanical ventilation. It discusses elastic recoil, viscous forces, compliance, resistance, and the equation of motion and the time constant of the respiratory system. I
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9

Kreit, John W. Acute Respiratory Distress Syndrome (ARDS). Edited by John W. Kreit. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190670085.003.0012.

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Acute Respiratory Distress Syndrome reviews the definitions, causes, pathophysiology, and management of this relatively common, life-threatening disorder. This chapter describes how to ensure adequate tissue oxygen delivery while minimizing ventilator-induced lung injury and provides an in-depth review of how to determine the optimum level of positive end-expiratory pressure (PEEP). The first topic addressed is the precipitating factors and pathophysiology of acute respiratory distress syndrome. Next the chapter turns to mechanical ventilation, and covers the subjects of adequate oxygenation,
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10

Hedenstierna, Göran, and Hans Ulrich Rothen. Physiology of positive-pressure ventilation. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0088.

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During positive pressure ventilation the lung volume is reduced because of loss of respiratory muscle tone. This promotes airway closure that occurs in dependent lung regions. Gas absorption behind the closed airway results sooner or later in atelectasis depending on the inspired oxygen concentration. The elevated airway and alveolar pressures squeeze blood flow down the lung so that a ventilation/perfusion mismatch ensues with more ventilation going to the upper lung regions and more perfusion going to the lower, dependent lung. Positive pressure ventilation may impede the return of venous bl
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11

Cordioli, Ricardo Luiz, and Laurent Brochard. Respiratory system compliance and resistance in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0074.

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Under mechanical ventilation, monitoring of respiratory mechanics is fundamental, especially in patients with abnormal mechanics. In order to appropriately set the ventilator, clinicians need to understand the relationship between pressure, volume and flow. To move air in and out the thorax, energy must be dissipated against elastic and resistive forces. Elastance is the pressure to volume ratio and necessitates an end inspiratory occlusion to measure the so-called plateau pressure. Resistance is the ratio between pressure dissipated and mean gas flow. Finally, the total positive end expirator
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12

Lee, Jae Myeong, and Michael R. Pinsky. Cardiovascular interactions in respiratory failure. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0087.

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Acute respiratory failure not only impairs gas exchange, but also stresses cardiovascular reserve by increasing the need for increased cardiac output (CO) to sustain O2 delivery in the face of hypoxaemia, increased O2 demand by the increased work of breathing and inefficient gas exchange, and increased right ventricular afterload due to lung collapse via hypoxic pulmonary vasoconstriction. Mechanical ventilation, though often reversing these processes by lung recruitment and improved arterial oxygenation, may also decrease CO by increasing right atrial pressure by either increasing intrathorac
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13

Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0013.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system
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14

Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199687039.003.0013_update_001.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system
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15

Vieillard-Baron, Antoine. The respiratory system. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0015.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system
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16

Lee, Jan Hau, and Ira M. Cheifetz. Respiratory Failure and Mechanical Ventilation. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199918027.003.0006.

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This chapter on respiratory failure and mechanical ventilation provides essential information about how to support children with severe respiratory disorders. The authors discuss multiple modes of respiratory support, including high-flow nasal cannula oxygen, noninvasive ventilation with continuous positive airway pressure and bilevel positive airway pressure, as well as conventional, high-frequency, and alternative modes of invasive ventilation. The section on invasive mechanical ventilation includes key information regarding gas exchange goals, modes of ventilation, patient–ventilator intera
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17

Bauman, Kristy A., and Robert C. Hyzy. Volume-controlled mechanical ventilation. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0095.

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The goal of mechanical ventilation is to achieve adequate gas exchange while minimizing haemodynamic compromise and ventilator-associated lung injury. Volume-controlled ventilation can be delivered via several modes, including controlled mechanical ventilation, assist control (AC) and synchronized intermittent mandatory ventilation (SIMV). .In volume-controlled modes, the clinician sets the flow pattern, flow rate, trigger sensitivity, tidal volume, respiratory rate, positive end-expiratory pressure, and fraction of inspired oxygen. Patient ventilator synchrony can be enhanced by setting appro
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18

Cuartero, Mireia, and Niall D. Ferguson. High-frequency ventilation and oscillation. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0098.

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High-frequency oscillatory ventilation (HFOV) is a key member of the family of modes called high-frequency ventilation and achieves adequate alveolar ventilation despite using very low tidal volumes, often below the dead space volume, at frequencies significantly above normal physiological values. It has been proposed as a potential protective ventilatory strategy, delivering minimal alveolar tidal stretch, while also providing continuous lung recruitment. HFOV has been successfully used in neonatal and paediatric intensive care units over the last 25 years. Since the late 1990s adults with ac
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19

Carlucci, Annalisa, and Paolo Navalesi. Weaning failure in critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0103.

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Weaning failure has been defined as failure to discontinue mechanical ventilation, as assessed by the spontaneous breathing trial, or need for re-intubation after extubation, so-called extubation failure. Both events represent major clinical and economic burdens, and are associated with high morbidity and mortality. The most important mechanism leading to discontinuation failure is an unfavourable balance between respiratory muscle capacity and the load they must face. Beyond specific diseases leading to loss of muscle force-generating capacity, other factors may impair respiratory muscle func
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