The physiology of extracorporeal membrane oxygenation: The Fick principle

Perfusion ◽  
2021 ◽  
pp. 026765912110559
Author(s):  
Hoong Lim
Keyword(s):  
Blood Flow ◽  
Extracorporeal Membrane Oxygenation ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Fick Principle ◽  
Membrane Oxygenation ◽  
Lung Failure ◽  
Va Ecmo ◽  
The Relationship ◽  
Vv Ecmo

Extracorporeal membrane oxygenation (ECMO) can be delivered in veno-arterial (VA) and veno-venous (VV) configurations based on the cannulation strategy. VA and VV ECMO are delivered primarily for haemodynamic and respiratory support in patients with severe heart and lung failure, respectively. The Fick principle describes the relationship between blood flow and oxygen consumption – key parameters in the physiological management of extracorporeal support. This review will discuss the application of the Fick principle in: (i) recirculation in VV ECMO; (ii) the quantification of oxygen delivery (DO2) in VV ECMO and (iii) the quantification of transpulmonary blood flow and systemic arterial oxygen saturation in VA ECMO.

Rest ventilator management in children on veno-venous extracorporeal membrane oxygenation

2021 ◽  
pp. 039139882199938
Author(s):  
Matthew L Friedman ◽  
Samer Abu-Sultaneh ◽  
James E Slaven ◽  
Christopher W Mastropietro
Keyword(s):  
Mechanical Ventilation ◽  
Extracorporeal Membrane Oxygenation ◽  
Life Support ◽  
Arterial Oxygen Saturation ◽  
Peak Inspiratory Pressure ◽  
Conventional Mechanical Ventilation ◽  
Arterial Oxygen ◽  
Multivariable Logistic Regression Analysis ◽  
Membrane Oxygenation ◽  
Ventilator Management

Background: We aimed to use the Extracorporeal Life Support Organization registry to describe the current practice of rest mechanical ventilation setting in children receiving veno-venous extracorporeal membrane oxygenation (V-V ECMO) and to determine if relationships exist between ventilator settings and mortality. Methods: Data for patients 14 days to 18 years old who received V-V ECMO from 2012-2016 were reviewed. Mechanical ventilation data available includes mode and settings at 24 h after ECMO cannulation. Multivariable logistic regression analysis was performed to determine if rest settings were associated with mortality. Results: We reviewed 1161 subjects, of which 1022 (88%) received conventional mechanical ventilation on ECMO. Rest settings, expressed as medians (25th%, 75th%), are as follows: rate 12 breaths/minute (10, 17); peak inspiratory pressure (PIP) 22 cmH2O (20,27); positive end expiratory pressure (PEEP) 10 cmH2O (8, 10); and fraction of inspired oxygen (FiO2) 0.4 (0.37, 0.60). Survival to discharge was 68%. Higher ventilator FiO2 (odds ratio:1.13 per 0.1 increase, 95% confidence interval:1.04, 1.23), independent of arterial oxygen saturation, was associated with mortality. Conclusions: Current rest ventilator management for children receiving V-V ECMO primarily relies on conventional mechanical ventilation with moderate amounts of PIP, PEEP, and FiO2. Further study on the relationship between FiO2 and mortality should be pursued.

scholarly journals Outcomes of severe systemic rheumatic disease patients requiring extracorporeal membrane oxygenation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pierre Bay ◽  
Guillaume Lebreton ◽  
Alexis Mathian ◽  
Pierre Demondion ◽  
Cyrielle Desnos ◽  
...  
Keyword(s):  
Extracorporeal Membrane Oxygenation ◽  
Hospital Mortality ◽  
Critically Ill ◽  
Left Ventricular ◽  
Arterial Lactate ◽  
Saps Ii ◽  
Membrane Oxygenation ◽  
Saps Ii Score ◽  
Va Ecmo ◽  
Vv Ecmo

Abstract Background Systemic rheumatic diseases (SRDs) are a group of inflammatory disorders that can require intensive care unit (ICU) admission because of multiorgan involvement with end-organ failure(s). Critically ill SRD patients requiring extracorporeal membrane oxygenation (ECMO) were studied to gain insight into their characteristics and outcomes. Methods This French monocenter, retrospective study included all SRD patients requiring venovenous (VV)- or venoarterial (VA)-ECMO admitted to a 26-bed ECMO-dedicated ICU from January 2006 to February 2020. The primary endpoint was in-hospital mortality. Results Ninety patients (male/female ratio: 0.5; mean age at admission: 41.6 ± 15.2 years) admitted to the ICU received VA/VV-ECMO, respectively, for an SRD-related flare (n = 69, n = 38/31) or infection (n = 21, n = 10/11). SRD was diagnosed in-ICU for 31 (34.4%) patients. In-ICU and in-hospital mortality rates were 48.9 and 51.1%, respectively. Nine patients were bridged to cardiac (n = 5) or lung transplantation (n = 4), or left ventricular assist device (n = 2). The Cox multivariable model retained the following independent predictors of in-hospital mortality: in-ICU SRD diagnosis, day-0 Simplified Acute Physiology Score (SAPS) II score ≥ 70 and arterial lactate ≥ 7.5 mmol/L for VA-ECMO–treated patients; diagnosis other than vasculitis, day-0 SAPS II score ≥ 70, ventilator-associated pneumonia and arterial lactate ≥ 7.5 mmol/L for VV-ECMO–treated patients. Conclusions ECMO support is a relevant rescue technique for critically ill SRD patients, with 49% survival at hospital discharge. Vasculitis was independently associated with favorable outcomes of VV-ECMO–treated patients. Further studies are needed to specify the role of ECMO for SRD patients.

Venovenous Extracorporeal Membrane Oxygenation in Pediatric Respiratory Failure

2016 ◽  
Vol 82 (9) ◽  
pp. 787-788 ◽  
Author(s):  
P. Benson Ham ◽  
Brice Hwang ◽  
Linda J. Wise ◽  
K. Christian Walters ◽  
Walter L. Pipkin ◽  
...  
Keyword(s):  
Respiratory Failure ◽  
Extracorporeal Membrane Oxygenation ◽  
Pediatric Patients ◽  
Oxygenation Index ◽  
Lung Damage ◽  
Positive Pressure ◽  
Membrane Oxygenation ◽  
Short Run ◽  
Va Ecmo ◽  
Vv Ecmo

Conventional treatment of respiratory failure involves positive pressure ventilation that can worsen lung damage. Extracorporeal membrane oxygenation (ECMO) is typically used when conventional therapy fails. In this study, we evaluated the use of venovenous (VV)-ECMO for the treatment of severe pediatric respiratory failure at our institution. A retrospective analysis of pediatric patients (age 1–18) placed on ECMO in the last 15 years (1999–2014) by the pediatric surgery team for respiratory failure was performed. Five pediatric patients underwent ECMO (mean age 10 years; range, 2–16). All underwent VV-ECMO. Diagnoses were status asthmaticus (2), acute respiratory distress syndrome due to septic shock (1), aspergillus pneumonia (1), and respiratory failure due to parainfluenza (1). Two patients had severe barotrauma prior to ECMO initiation. Average oxygenation index (OI) prior to cannulation was 74 (range 23–122). No patients required conversion to VA-ECMO. The average ECMO run time was 4.4 days (range 2–6). The average number of days on the ventilator was 15 (range 4–27). There were no major complications due to the procedure. Survival to discharge was 100%. Average follow up is 4.4 years (range 1–15). A short run of VV-ECMO can be lifesaving for pediatric patients in respiratory failure. Survival is excellent despite severely elevated oxygen indices. VV-ECMO may be well tolerated and can be considered for severe pediatric respiratory failure.

Extracorporeal Membrane Oxygenation

2019 ◽  
pp. 429-434
Author(s):  
J. Kyle Bohman ◽  
Gregory J. Schears
Keyword(s):  
Extracorporeal Membrane Oxygenation ◽  
General Term ◽  
Extracorporeal Circuit ◽  
Extracorporeal Cardiopulmonary Resuscitation ◽  
Arterial Circulation ◽  
Membrane Oxygenation ◽  
Venous Circulation ◽  
Va Ecmo ◽  
Exchange Membrane ◽  
Vv Ecmo

Extracorporeal membrane oxygenation (ECMO) is a general term describing an extracorporeal circuit with a pump and a gas exchange membrane that can be used for cardiac support or respiratory support (or both) depending on its configuration. The 2 basic configurations of ECMO are venoarterial (VA) and venovenous (VV). VA ECMO removes blood from the venous circulation and pumps it through the oxygenator and back into the patient’s arterial circulation. VV ECMO removes blood from the venous circulation and pumps it through the oxygenator and back into the patient’s venous circulation. Common indications for VA ECMO include postcardiotomy, malignant ventricular arrhythmias, cardiogenic shock, and extracorporeal cardiopulmonary resuscitation.

scholarly journals Conversion from Venovenous to Venoarterial Extracorporeal Membrane Oxygenation in Adults

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 188
Author(s):  
Lars Falk ◽  
Alexander Fletcher-Sandersjöö ◽  
Jan Hultman ◽  
Lars Mikael Broman
Keyword(s):  
Extracorporeal Membrane Oxygenation ◽  
Right Ventricular Failure ◽  
Survival Prediction ◽  
Ventricular Failure ◽  
Membrane Oxygenation ◽  
Venoarterial Extracorporeal Membrane Oxygenation ◽  
Failure Assessment ◽  
Va Ecmo ◽  
Rv Function ◽  
Vv Ecmo

No major study has been performed on the conversion from venovenous (VV) to venoarterial (VA) extracorporeal membrane oxygenation (ECMO) in adults. This single-center retrospective cohort study aimed to investigate the incidence, indication, and outcome in patients who converted from VV to VA ECMO. All adult patients (≥18 years) who commenced VV ECMO at our center between 2005 and 2018 were screened. Of 219 VV ECMO patients, 21% (n = 46) were converted to VA ECMO. The indications for conversion were right ventricular failure (RVF) (65%), cardiogenic shock (26%), and other (9%). In the converted patients, there was a significant increase in Sequential Organ Failure Assessment (SOFA) scores between admission 12 (9–13) and conversion 15 (13–17, p < 0.001). Compared to non-converted patients, converted patients also had a higher mortality rate (62% vs. 16%, p < 0.001) and a lower admission Respiratory Extracorporeal Membrane Oxygenation Survival Prediction (RESP) score (p < 0.001). Outcomes were especially unfavorable in those converted due to RVF. These results indicate that VA ECMO, as opposed to VV ECMO, should be considered as the first mode of choice in patients with respiratory failure and signs of circulatory impairment, especially in those with impaired RV function. For the remaining patients, Pre-admission RESP score, daily echocardiography, and SOFA score trajectories may help in the early identification of those where conversion from VV to VA ECMO is warranted. Multi-centric studies are warranted to validate these findings.

scholarly journals Stroke During Extracorporeal Membrane Oxygenation: Timing, Risk Factors and Clinical Outcomes

2021 ◽  
Author(s):  
Harim Kim ◽  
Jeong Hoon Yang ◽  
Chi Ryang Chung ◽  
Kyeongman Jeon ◽  
Gee Young Suh ◽  
...  
Keyword(s):  
Risk Factors ◽  
Extracorporeal Membrane Oxygenation ◽  
Brain Injuries ◽  
Medical Center ◽  
Ecmo Support ◽  
Membrane Oxygenation ◽  
Significant Difference ◽  
Stroke Group ◽  
Va Ecmo ◽  
Vv Ecmo

Abstract Background Among various complications of extracorporeal membrane oxygenation (ECMO), stroke continues to be a major factor that worsens the clinical outcome because it is associated with mortality and adverse neurologic outcomes. Appropriate risk evaluation, screening, and management of neurologic injury under ECMO support has not yet been established and requires further investigation. Thus, this study analyzes the stroke related risk factors and outcomes in order to determine the appropriate intervention to minimize neurologic sequalae while on ECMO. Method Total 1039 patients who underwent ECMO from January 2012 to September 2019 at the Samsung Medical Center were reviewed and 759 subjects were selected for the analysis. The exclusion criteria were age < 18y, failure of successful ECMO initiation, multiple ECMO runs, underlying severe brain injury, and incomplete medical records. Multivariate analysis was performed to identify the risk factors of strokes on ECMO support using cox proportional hazard regression. In order to analyze the timing of stroke after ECMO initiation, the Mann–Whitney U test and Kruskal–Wallis rank sum test were performed.Results Among The overall incidence of stroke was 5.1% (n = 39) without a significant difference between venoarterial (VA) and venovenous(VV) ECMO (5.3% and 4.8%, respectively, p = 0.480). Independent risk factors for stroke were intraaortic balloon pump (IABP, p = 0.0008) and a history of stroke (p = 0.0354). Most hypoxic brain injuries were found in the VA ECMO (93.3%), and 54.5% of intracranial hemorrhage were in the VV ECMO. Most patients with strokes (61.5%) were diagnosed within 72hours after ECMO initiation. The time taken for stroke event from the time of ECMO insertion was shorter in the VA ECMO than in the VV ECMO (median 1.5 vs. 3 days). The stroke group had a higher mortality rate than the non-stroke group (64.1% and 44.7%, respectively, p = 0.014). Conclusion Concurrent ECMO and IABP use may increase the incidence of stroke during ECMO support. Evaluation for stroke that includes CT within 72 hours of ECMO insertion may enable early diagnosis, allowing timely intervention.

scholarly journals Massive aspiration syndrome: a possible indication for “emergent” veno-venous extracorporeal membrane oxygenation?: a case report

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Emiliano Gamberini ◽  
Venerino Poletti ◽  
Emanuele Russo ◽  
Alessandro Circelli ◽  
Marco Benni ◽  
...  
Keyword(s):  
Respiratory Failure ◽  
Extracorporeal Membrane Oxygenation ◽  
White Male ◽  
Ecmo Support ◽  
Circulatory Support ◽  
Lung Protective Ventilation ◽  
Emergency Setting ◽  
Membrane Oxygenation ◽  
Va Ecmo ◽  
Vv Ecmo

Abstract Background Veno-venous extracorporeal membrane oxygenation (VV-ECMO) is usually performed in cases of severe respiratory failure in which conventional and advanced mechanical ventilation strategies are ineffective in achieving true lung-protective ventilation, thus triggering ventilatory-induced lung injury. If circulatory failure coexists, veno-arterial ECMO (VA-ECMO) may be preferred over VV-ECMO because of its potential for circulatory support. In VA-ECMO, the respiratory contribution is less effective and the complication rate is higher than in the VV configuration. Case presentation The authors present a case in which VV-ECMO was performed in an emergency setting to treat a 68-year-old White male patient who experienced acute respiratory failure after massive aspiration. Despite intubation and intensive care unit admission, multiple organ failure occurred suddenly, thus prompting referral to a level-1 trauma center with an ECMO facility. The patient’s condition slowly improved with VV-ECMO support along with standard treatment for hemodynamic impairment. VV-ECMO was discontinued on day 8. The patient was extubated on day 14 and discharged home fully recovered 34 days after the event. Conclusions Attention was focused on the decision to initiate VV-ECMO support even in the presence of severe hemodynamic derangement, although VA-ECMO could have provided better hemodynamic support but less effective respiratory support.

scholarly journals The Relative Early Decrease in Platelet Count Is Associated With Mortality in Post-cardiotomy Patients Undergoing Venoarterial Extracorporeal Membrane Oxygenation

2021 ◽  
Vol 8 ◽  
Author(s):  
Liangshan Wang ◽  
Juanjuan Shao ◽  
Chengcheng Shao ◽  
Hong Wang ◽  
Ming Jia ◽  
...  
Keyword(s):  
Platelet Count ◽  
Extracorporeal Membrane Oxygenation ◽  
Hospital Mortality ◽  
Cardiogenic Shock ◽  
Characteristic Curve ◽  
Membrane Oxygenation ◽  
Venoarterial Extracorporeal Membrane Oxygenation ◽  
Relative Decrease ◽  
Va Ecmo ◽  
The Relationship

Background: The relationship between the magnitude of platelet count decrease and mortality in post-cardiotomy cardiogenic shock (PCS) patients undergoing venoarterial extracorporeal membrane oxygenation (VA-ECMO) has not been well-reported. This study was designed to evaluate the association between the relative decrease in platelet count (RelΔplatelet) at day 1 from VA-ECMO initiation and in-hospital mortality in PCS patients.Methods: Patients (n = 178) who received VA-ECMO for refractory PCS between January 2016 and December 2018 at the Beijing Anzhen Hospital were reviewed retrospectively. Multivariable logistic regression analyses were performed to assess the association between RelΔplatelet and in-hospital mortality.Results: One hundred and sixteen patients (65%) were weaned from VA-ECMO, and 84 patients (47%) survived to hospital discharge. The median [interquartile range (IQR)] time on VA-ECMO support was 5 (3–6) days. The median (IQR) RelΔ platelet was 41% (26–59%). Patients with a RelΔ platelet ≥ 50% had an increased mortality compared to those with a RelΔ platelet &lt; 50% (57 vs. 37%; p &lt; 0.001). A large RelΔplatelet (≥50%) was independently associated with in-hospital mortality after controlling for potential confounders (OR 8.93; 95% CI 4.22–18.89; p &lt; 0.001). The area under the receiver operating characteristic curve for RelΔ platelet was 0.78 (95% CI, 0.71–0.85), which was better than that of platelet count at day 1 (0.69; 95% CI, 0.61–0.77).Conclusions: In patients receiving VA-ECMO for post-cardiotomy cardiogenic shock, a large relative decrease in platelet count in the first day after ECMO initiation is independently associated with an increased in-hospital mortality.

Acute Kidney Injury During Extracorporeal Membrane Oxygenation: VA ECMO Versus VV ECMO

2021 ◽  
pp. 088506662110353
Author(s):  
Zhixiang Mou ◽  
Jinxuan He ◽  
Tianjun Guan ◽  
Lan Chen
Keyword(s):  
Acute Kidney Injury ◽  
Extracorporeal Membrane Oxygenation ◽  
Web Of Science ◽  
Meta Analysis ◽  
Kidney Injury ◽  
Patient Deterioration ◽  
Membrane Oxygenation ◽  
Different Types ◽  
Va Ecmo ◽  
Vv Ecmo

Purpose Acute kidney injury (AKI) has been reported to be one of the most common complications in patients receiving extracorporeal membrane oxygenation (ECMO), yet variations in AKI between different types of ECMO remain unclear. This meta-analysis systematically compares AKI/severe AKI in adult patients requiring different types of ECMO. Methods Two authors independently performed a literature search using PubMed, Web of Science, and Embase, encompassing publications up until April 20, 2020 (inclusive). The number of AKI patients, including patients who required/did not require renal replacement therapy (RRT), and deceased patients with AKI/severe AKI, who received different types of ECMO were collated and analyzed using STATA. Results The results indicated that there were no significant differences in the risk of AKI/severe AKI among different types of ECMO. However, the presence of AKI and severe AKI during veno-arterial (VA) ECMO was more strongly associated with mortality. Conclusions Although mortality rates related to AKI/severe AKI during VV ECMO are high, the occurrence of AKI/severe AKI during VA ECMO should be given greater attention, as these instances are considered strong indicators of patient deterioration and even death. Additional studies are needed to corroborate these findings.

scholarly journals Different characteristics of bloodstream infection during venoarterial and venovenous extracorporeal membrane oxygenation in adult patients

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyoung Soo Kim ◽  
Sunghoon Park ◽  
Ho Hyun Ko ◽  
Sang Ook Ha ◽  
Sun Hee Lee ◽  
...  
Keyword(s):  
Blood Culture ◽  
Extracorporeal Membrane Oxygenation ◽  
Bloodstream Infection ◽  
Clinical Characteristics ◽  
Gram Positive ◽  
Gram Negative ◽  
Membrane Oxygenation ◽  
Gram Negative Bacteremia ◽  
Va Ecmo ◽  
Vv Ecmo

AbstractCurrently, there is scarcity of data on whether differences exist in clinical characteristics and outcomes of bloodstream infection (BSI) between venoarterial (VA) and venovenous (VV) extracorporeal membrane oxygenation (ECMO) and whether they differ between Candida BSI and bacteremia in adult ECMO patients. We retrospectively reviewed data of patients who required ECMO for > 48 h and had BSIs while receiving ECMO between January 2015 and June 2020. Cases with a positive blood culture result within 24 h of ECMO implantation were excluded. We identified 94 (from 64 of 194 patients) and 38 (from 17 of 56 patients) BSI episodes under VA and VV ECMO, respectively. Fifty nine BSIs of VA ECMO (59/94, 62.8%) occurred in the first 2 weeks after ECMO implantation, whereas 24 BSIs of VV ECMO (24/38, 63.2%) occurred after 3 weeks of ECMO implantation. Gram-negative bacteremia (39/59, 66.1%) and gram-positive bacteremia (10/24, 41.7%) were the most commonly identified BSI types in the first 2 weeks after VA ECMO implantation and after 3 weeks of VV implantation, respectively. Timing of Candida BSI was early (6/11, 54.5% during the first 2 weeks) in VA ECMO and late (6/9, 66.7% after 3 weeks of initiation) in VV ECMO. Compared with bacteremia, Candida BSI showed no differences in clinical characteristics and outcomes during VA and VV ECMO, except the significant association with prior exposure to carbapenem in VA ECMO (vs. gram-negative bacteremia [P = 0.006], vs. gram-positive bacteremia [P = 0.03]). Our results suggest that ECMO modes may affect BSI clinical features and timing. In particular, Candida BSI occurrence during the early course of VA ECMO is not uncommon, especially in patients with prior carbapenem exposure; however, it usually occurs during the prolonged course of VV ECMO. Consequently, routine blood culture surveillance and empiric antifungal therapy might be warranted in targeted populations of adult ECMO patients, regardless of levels of inflammatory markers and severity scores.

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