Use Of Protective Ventilation Research Articles

The Use of Protective Ventilation in Post-COVID Respiratory Failure

Implementation of the principles of protective ventilation in the intensive care of respiratory failure in patients after COVID-19 can improve the results of treatment of patients with cardiosurgical abnormalities, namely the implementation of surgical treatment in the post-COVID-19 period. The widespread occurrence of coronavirus disease 2019 (COVID-19) in the world has led to a sharp decrease in the number of cardiac surgeries and had a negative impact on treatment outcomes.
 Case description. Patient P., 62 years old, underwent examination and treatment from February 18 to March 3, 2021 at the National Amosov Institute of Cardiovascular Surgery of the National Academy of Medical Sciences of Ukraine with a diagnosis of infective endocarditis of the aortic valve. Aortic insufficiency. Acute heart failure. Grade III respiratory failure. Condition after bilateral polysegmental COVID-19 pneumonia, chronic obstructive pulmonary disease, GOLD 2. After aortic valve replacement, plasty of aortic root abscess due to infective endocarditis of the aortic valve, the patient was admitted to the intensive care unit for further treatment. In the postoperative period, respiratory failure was observed. Given the COVID-19 pneumonia, mechanical ventilation was performed according to the recommendations for protective ventilation. The duration of mechanical ventilation was 72 hours, followed by a successful transition to self-breathing.
 Conclusions. Given the initial condition of the patient with COVID-19 pneumonia, protective lung ventilation is reasonable after cardiac surgery. This issue needs further study.

Lung-protective ventilation increases cerebral metabolism and non-inflammatory brain injury in porcine experimental sepsis

BackgroundProtective ventilation with lower tidal volumes reduces systemic and organ-specific inflammation. In sepsis-induced encephalopathy or acute brain injury the use of protective ventilation has not been widely investigated (experimentally or clinically). We hypothesized that protective ventilation would attenuate cerebral inflammation in a porcine endotoxemic sepsis model. The aim of the study was to study the effect of tidal volume on cerebral inflammatory response, cerebral metabolism and brain injury. Nine animals received protective mechanical ventilation with a tidal volume of 6 mL × kg−1 and nine animals were ventilated with a tidal volume of 10 mL × kg−1. During a 6-h experiment, the pigs received an endotoxin intravenous infusion of 0.25 µg × kg−1 × h−1. Systemic, superior sagittal sinus and jugular vein blood samples were analysed for inflammatory cytokines and S100B. Intracranial pressure, brain tissue oxygenation and brain microdialysis were sampled every hour.ResultsNo differences in systemic or sagittal sinus levels of TNF-α or IL-6 were seen between the groups. The low tidal volume group had increased cerebral blood flow (p < 0.001) and cerebral oxygen delivery (p < 0.001), lower cerebral vascular resistance (p < 0.05), higher cerebral metabolic rate (p < 0.05) along with higher cerebral glucose consumption (p < 0.05) and lactate production (p < 0.05). Moreover, low tidal volume ventilation increased the levels of glutamate (p < 0.01), glycerol (p < 0.05) and showed a trend towards higher lactate to pyruvate ratio (p = 0.08) in cerebral microdialysate as well as higher levels of S-100B (p < 0.05) in jugular venous plasma compared with medium–high tidal volume ventilation.ConclusionsContrary to the hypothesis, protective ventilation did not affect inflammatory cytokines. The low tidal volume group had increased cerebral blood flow, cerebral oxygen delivery and cerebral metabolism together with increased levels of markers of brain injury compared with medium–high tidal volume ventilation.

Extracorporeal CO2 removal in a case of respiratory distress syndrome by sepsis

Multiorgan dysfunction syndrome is the most common cause of mortality in intensive care units. The lungs and kidneys are frequently affected, so up to 60% of patients require simultaneous respiratory support and renal replacement therapy. Extracorporeal CO2 elimination systems have now been developed with the aim of reducing the incidence of acute lung injury. These systems can be combined with renal support therapies in patients with dysfunction of both organs. We present a case of respiratory septic shock with renal failure and respiratory distress syndrome, in which extracorporeal elimination of CO2 therapy facilitated the use of protective ventilation, with a low tidal volume of 4ml/kg, plateau pressure below 30cmH2O, and PaCO2 values of less than 60mmHg.

Características de la ventilación mecánica invasiva en COVID-19 para médicos no especialistas

SARS-CoV-2 is the agent responsible for COVID-19, the current pandemic, which is characterized by developing respiratory disturbances that are associated with severe hypoxemia associated with symptoms of non-bacterial pneumonia, ARDS up to multi-organ failure. It has been characterized by presenting 2 different phenotypes (phenotype L and phenotype H), with phenotype H being a stage of progressive deterioration of phenotype L, which depends on the earliness with which ventilatory management begins and the degree of inflammatory compromise. However, since VMI can generate VILI, the use of protective ventilation has been recommended as a ventilatory strategy for COVID-19. This review aims to comment on the available evidence of the essential aspects of protective IMV in the context of ARDS associated with COVID-19, in addition to the use of neuromuscular blockade and prone strategies.

Variability in the Use of Protective Mechanical Ventilation During General Anesthesia.

The purpose of this study was to determine whether significant variation exists in the use of protective ventilation across individual anesthesia providers and whether this difference can be explained by patient, procedure, and provider-related characteristics. The cohort consisted of 262 anesthesia providers treating 57,372 patients at a tertiary care hospital between 2007 and 2014. Protective ventilation was defined as a median positive end-expiratory pressure of 5 cm H2O or more, tidal volume of <10 mL/kg of predicted body weight and plateau pressure of <30 cm H2O. Analysis was performed using mixed-effects logistic regression models with propensity scores to adjust for covariates. The definition of protective ventilation was modified in sensitivity analyses. In unadjusted analysis, the mean probability of administering protective ventilation was 53.8% (2.5th percentile of provider 19.9%, 97.5th percentile 80.8%). After adjustment for a large number of covariates, there was little change in the results with a mean probability of 51.1% (2.5th percentile 24.7%, 97.5th percentile 77.2%). The variations persisted when the thresholds for protective ventilation were changed. There was significant variability across individual anesthesia providers in the use of intraoperative protective mechanical ventilation. Our data suggest that this variability is highly driven by individual preference, rather than patient, procedure, or provider-related characteristics.

Sedation and neuromuscular blocking agents in acute respiratory distress syndrome.

Mechanical ventilation (MV) is the cornerstone of acute respiratory distress syndrome (ARDS) management. The use of protective ventilation is a priority in this acute phase of lung inflammation. Neuromuscular blocking agents (NMBAs) induce reversible muscle paralysis. Their use in patients with ARDS remains controversial but occurs frequently. NMBAs are used in 25-45% of ARDS patients for a mean period of 1±2 days. The main indications of NMBAs are hypoxemia and facilitation of MV. For ethical reasons, NMBA use is inseparable from sedation in the management of early ARDS. During paralysis, sedation monitoring seems to be necessary to avoid awareness with recall. Three randomized controlled trials (RCTs) have demonstrated that the systematic use of NMBAs in the early management of ARDS patients improves oxygenation. Furthermore, the most recent trial reported a reduction of mortality at 90 days when NMBAs were infused over 48 hours. Spontaneous ventilation (SV) during MV at the acute phase of ARDS could improve oxygenation and alveolar recruitment, but it may not allow protective ventilation. The major risk is an increase in ventilator-induced lung injury. However, the adverse effects of NMBAs are widely discussed, particularly the occurrence of intensive care unit (ICU)-acquired weakness. This review analyses the recent findings in the literature concerning sedation and paralysis in managing ARDS.

Stroke volume changes induced by a recruitment maneuver predict fluid responsiveness in patients with protective ventilation in the operating theater

During abdominal surgery, the use of protective ventilation with a low tidal volume, positive expiratory pressure (PEEP) and recruitment maneuvers (RMs) may limit the applicability of dynamic preload indices. The objective of the present study was to establish whether or not the variation in stroke volume (SV) during an RM could predict fluid responsiveness.We prospectively included patients receiving protective ventilation (tidal volume: 6 mL kg−1, PEEP: 5–7 cmH2O; RMs). Hemodynamic variables, such as heart rate, arterial pressure, SV, cardiac output (CO), respiratory variation in SV (ΔrespSV) and pulse pressure (ΔrespPP), and the variation in SV (ΔrecSV) as well as pulse pressure (ΔrecPP) during an RM were measured at baseline, at the end of the RM, and after fluid expansion. Responders were defined as patients with an SV increase of at least 15% after infusion of 500 mL of crystalloid solution.Thirty-seven (62%) of the 60 included patients were responders. Responders and nonresponders differed significantly in terms of the median ΔrecSV (26% [19–37] vs 10% [4–12], respectively; P < 0.0001). A ΔrecSV value more than 16% predicted fluid responsiveness with an area under the receiver-operating characteristic curve (AU) of 0.95 (95% confidence interval [CI]: 0.91–0.99; P < 0.0001) and a narrow gray zone between 15% and 17%. The area under the curve values for ΔrecPP and ΔrespSV were, respectively, 0.81 (95%CI: 0.7–0.91; P = 0.0001) and 0.80 (95%CI: 0.70–0.94; P < 0.0001). ΔrespPP did not predict fluid responsiveness.During abdominal surgery with protective ventilation, a ΔrecSV value more than 16% accurately predicted fluid responsiveness and had a narrow gray zone (between 15% and 17%). ΔrecPP and ΔrespSV (but not ΔrespPP) were also predictive.

What's new in mechanical ventilation in patients without ARDS: lessons from the ARDS literature.

Introduction The incidence of acute respiratory distress syndrome (ARDS) varies greatly across the world [1], and its impact on the outcome of critically ill patients remains significant [1]. The publication of the ARMA trial [2] demonstrated that a lung protective strategy of ventilation, using a tidal volume (VT) of 6 ml/kg predicted body weight (PBW), decreased mortality in patients with ARDS, and led to the widespread, albeit not universal, use of lung protective strategies in this group of patients. Recent studies suggest that the incidence of ARDS is decreasing [3, 4] and that this reduction is believed to be a result of advances in hospital practice and numerous quality improvement initiatives [4]. These advances included general quality improvement initiatives (i.e. infection control, timely antibiotics and resuscitation) and also specific critical care protocols such as the use of protective ventilation in critically ill patients without ARDS [5, 6]. Since the majority of the patients undergoing mechanical ventilation do not have ARDS, the number of studies focusing on strategies of ventilation in this group of patients has been increasing in recent years, both in surgical and non-surgical areas. The purpose of this paper is to review the recent evidence in mechanical ventilation in patients without ARDS.

Perioperative lung protective ventilation in obese patients.

The perioperative use and relevance of protective ventilation in surgical patients is being increasingly recognized. Obesity poses particular challenges to adequate mechanical ventilation in addition to surgical constraints, primarily by restricted lung mechanics due to excessive adiposity, frequent respiratory comorbidities (i.e. sleep apnea, asthma), and concerns of postoperative respiratory depression and other pulmonary complications. The number of surgical patients with obesity is increasing, and facing these challenges is common in the operating rooms and critical care units worldwide. In this review we summarize the existing literature which supports the following recommendations for the perioperative ventilation in obese patients: (1) the use of protective ventilation with low tidal volumes (approximately 8 mL/kg, calculated based on predicted -not actual- body weight) to avoid volutrauma; (2) a focus on lung recruitment by utilizing PEEP (8–15 cmH2O) in addition to recruitment maneuvers during the intraoperative period, as well as incentivized deep breathing and noninvasive ventilation early in the postoperative period, to avoid atelectasis, hypoxemia and atelectrauma; and (3) a judicious oxygen use (ideally less than 0.8) to avoid hypoxemia but also possible reabsorption atelectasis. Obesity poses an additional challenge for achieving adequate protective ventilation during one-lung ventilation, but different lung isolation techniques have been adequately performed in obese patients by experienced providers. Postoperative efforts should be directed to avoid hypoventilation, atelectasis and hypoxemia. Further studies are needed to better define optimum protective ventilation strategies and analyze their impact on the perioperative outcomes of surgical patients with obesity.

Airway and ventilator management in trauma patients.

Securing the airway to provide sufficient oxygenation and ventilation is of paramount importance in the management of all types of emergency patients. Particularly in severely injured patients, strategies should be adapted according to useful recent literature findings. The role of out-of-hospital endotracheal intubation in patients with severe traumatic brain injury as prevention of hypoxia still persists, and the ideal neuromuscular blocking agent will be a target of research. Standardized monitoring, including capnography and the use of standardized medication protocols without etomidate, can reduce further complications. Prophylactic noninvasive ventilation may be useful for patients with blunt chest trauma without respiratory insufficiency. An algorithm-based approach to airway management can prevent complications due to inadequate oxygenation or procedural difficulties in trauma patients; therefore, advanced equipment for handling a difficult airway is needed. After securing the airway, ventilation must be monitored by capnography, and normoventilation involving the early use of protective ventilation with low-tidal volume and moderate positive end-expiratory pressure must be the target. After early identification of patients with blunt chest trauma at risk for respiratory failure, noninvasive ventilation might be a treatment strategy, which should be evaluated in future research.

Mechanical ventilation with high tidal volume and associated mortality in the cardiac intensive care unit

Use of protective ventilation has been shown to decrease mortality in medical-surgical ICUs. There is limited data on tidal volume use in ventilated patients in the cardiac intensive care unit (CICU). We hypothesized that large tidal volumes are used in the CICU and that they could contribute to an increase in morbidity and mortality. We conducted a retrospective chart review of all mechanically ventilated patients with congestive heart failure or cardiac arrest in a single tertiary care CICU between April 2010 and February 2012. Ventilator settings were analyzed and tidal volume for predicted body weight (VT/PBW) was calculated for 51 patients. The median initial tidal volume was 525 ml (IQR: 500-600) and median VT/PBW was 9.3 ml/kg (IQR: 8.3-10.1). Overall mortality was 29.4%. On univariate analysis, patients that received a VT/PBW below the median, mortality was 23.1% (95% CI: 7.9-39.3) compared to 36.0% (95% CI: 17.2-55.0) in patients that received a VT/PBW above themedian (P = 0.31). On multivariate analysis, the OR for death was 9.0 (95% CI: 1.3-62.0, P = 0.03) with VT/PBW above the median. Mechanical ventilation with high tidal volumes was associated with increased mortality in patients with congestive heart failure and post cardiac arrest in our CICU.

Tidal Volumes during General Anesthesia

Tidal Volumes during General Anesthesia

Update in Mechanical Ventilation 2010

This article reviews selected contributions published in 2010 regarding epidemiology, clinical use, and consequences of invasive and noninvasive mechanical ventilation (MV). This includes the use of protective ventilation and of different modes, some specific risks of MV, such as ventilator-induced diaphragm dysfunction, and the importance of spontaneous breathing activity under MV, with or without sedation.

Les manœuvres de recrutement alvéolaire au cours du syndrome de détresse respiratoire aiguë

Acute respiratory distress syndrome (ARDS) is characterised by lung collapse and alveolar œdema which result in a profond hypoxemia. The use of protective ventilation is well known to reduce ventilator-induced lung injury. However, reduction of tidal volume is associated with lung derecruitment. In this setting, recruiting maneuvers (RMs) can be a useful tool to prevent derecruitment. Many experimental and physiological studies support RMs in ARDS, but at bedside, a lot of questions remain to be answered to find the best way to perform RMs.