https://en.wikipedia.org/wiki/Extracorporeal_membrane_oxygenation Page semi-protected Extracorporeal membrane oxygenation From Wikipedia, the free encyclopedia Jump to navigation Jump to search Technique of providing both cardiac and respiratory support Extracorporeal membrane oxygenation Veno-arterial (VA) ECMO for cardiac or respiratory failure.jpg Other names Extracorporeal life support (ECLS) ICD-10-PCS 5A15223 ICD-9-CM 39.65 MeSH 29295 MedlinePlus 007234 HCPCS-L2 36822 [edit on Wikidata] Extracorporeal membrane oxygenation (ECMO), also known as extracorporeal life support (ECLS), is an extracorporeal technique of providing prolonged cardiac and respiratory support to persons whose heart and lungs are unable to provide an adequate amount of gas exchange or perfusion to sustain life. The technology for ECMO is largely derived from cardiopulmonary bypass, which provides shorter-term support with arrested native circulation. The device used is a membrane oxygenator, also known as an artificial lung. ECMO works by temporarily drawing blood from the body to allow artificial oxygenation of the red blood cells and removal of carbon dioxide. Generally, it is used either post-cardiopulmonary bypass or in late-stage treatment of a person with profound heart and/or lung failure, although it is now seeing use as a treatment for cardiac arrest in certain centers, allowing treatment of the underlying cause of arrest while circulation and oxygenation are supported. ECMO is also used to support patients with the acute viral pneumonia associated with COVID-19 in cases where artificial ventilation alone is not sufficient to sustain blood oxygenation levels. [ ] Contents * 1 Medical uses + 1.1 Use in COVID-19 patients + 1.2 Outcomes * 2 Contraindications * 3 Side effects/Complications + 3.1 Neurologic + 3.2 Blood + 3.3 Bridge to assist device + 3.4 Children + 3.5 Infections * 4 Types + 4.1 Veno-arterial + 4.2 Veno-venous * 5 Initiation + 5.1 Cannulation + 5.2 Titration * 6 Maintenance + 6.1 Special considerations o 6.1.1 Blood flow o 6.1.2 Diuresis o 6.1.3 Left ventricular monitoring * 7 Weaning and discontinuing + 7.1 Veno-venous ECMO liberation trial + 7.2 Veno-arterial ECMO liberation trial * 8 History * 9 Society and culture + 9.1 Manufacturers + 9.2 Availability * 10 Research * 11 References * 12 External links Medical uses [220px-Ecmo_schema-1-] ECMO sketch [220px-ECMO_in_H1N1_patient_in_] ECMO circuit Guidelines that describe the indications and practice of ECMO are published by the Extracorporeal Life Support Organization (ELSO). Criteria for the initiation of ECMO vary by institution, but generally include acute severe cardiac or pulmonary failure that is potentially reversible and unresponsive to conventional management. Examples of clinical situations that may prompt the initiation of ECMO include the following:^[1] * Hypoxemic respiratory failure with a ratio of arterial oxygen tension to fraction of inspired oxygen (PaO2/FiO2) of <100 mmHg despite optimization of the ventilator settings, including the fraction of inspired oxygen (FiO2), positive end-expiratory pressure (PEEP), and inspiratory to expiratory (I:E) ratio * Hypercapnic respiratory failure with an arterial pH <7.20 * Refractory cardiogenic shock * Cardiac arrest * Failure to wean from cardiopulmonary bypass after cardiac surgery * As a bridge to either heart transplantation or placement of a ventricular assist device * As a bridge to lung transplantation * Septic shock is a more controversial but increasingly studied use of ECMO * Hypothermia, with a core temperature between 28 and 24 degC and cardiac instability, or with a core temperature below 24 degC.^[2] In those with cardiac arrest or cardiogenic shock, it appears to improve survival and good outcomes.^[3] Use in COVID-19 patients Beginning in early February 2020, doctors in China have increasingly been using ECMO as an adjunct support for patients presenting with acute viral pneumonia associated with SARS-CoV-2 infection (COVID-19) when, with ventilation alone, the blood oxygenation levels still remain too low to sustain the patient.^[4] The initial reports indicate that it is assisting in restoring patients' blood oxygen saturation and reducing fatalities among the approximately 3% of severe cases where it has been utilized.^[5] For critically ill patients, the mortality rate reduces from around 59-71% with conventional therapy to approximately 46% with extracorporeal membrane oxygenation.^[6] A March 2021 Los Angeles Times cover story illustrated the efficacy of ECMO in an extremely challenging COVID patient.^[7] Outcomes Early studies had shown survival benefit with use of ECMO for people in acute respiratory failure especially in the setting of acute respiratory distress syndrome.^[8]^[9] A registry maintained by ELSO of nearly 51,000 people that have received ECMO has reported outcomes with 75% survival for neonatal respiratory failure, 56% survival for pediatric respiratory failure, and 55% survival for adult respiratory failure.^[10] Other observational and uncontrolled clinical trials have reported survival rates from 50 to 70%.^[11]^[12] These reported survival rates are better than historical survival rates.^[13]^[14]^ [15] Even though ECMO is used for a range of conditions with varying mortality rates, early detection is key to prevent the progression of deterioration and increase survival outcomes.^[16] In the United Kingdom, veno-venous ECMO deployment is concentrated in designated ECMO centers to potentially improve care and promote better outcomes. Contraindications Most contraindications are relative, balancing the risks of the procedure versus the potential benefits. The relative contraindications are: 1. Conditions incompatible with normal life if the person recovers 2. Preexisting conditions that affect the quality of life (CNS status, end-stage malignancy, risk of systemic bleeding with anticoagulation) 3. Age and size 4. Futility: those who are too sick, have been on conventional therapy too long, or have a fatal diagnosis. Side effects/Complications Neurologic A common consequence in ECMO-treated adults is neurological injury, which may include intracerebral hemorrhage, subarachnoid hemorrhage, ischemic infarctions in susceptible areas of the brain, hypoxic-ischemic encephalopathy, unexplained coma, and brain death.^ [17] Bleeding occurs in 30 to 40% of those receiving ECMO and can be life-threatening. It is due to both the necessary continuous heparin infusion and platelet dysfunction. Meticulous surgical technique, maintaining platelet counts greater than 100,000/mm^3, and maintaining the target activated clotting time reduce the likelihood of bleeding.^[citation needed] Blood Heparin-induced thrombocytopenia (HIT) is increasingly common among people receiving ECMO. When HIT is suspected, the heparin infusion is usually replaced by a non-heparin anticoagulant.^[18] There is retrograde blood flow in the descending aorta whenever the femoral artery and vein are used for VA (Veno-Arterial) ECMO. Stasis of the blood can occur if left ventricular output is not maintained, which may result in thrombosis.^[citation needed] Bridge to assist device In VA ECMO, those whose cardiac function does not recover sufficiently to be weaned from ECMO may be bridged to a ventricular assist device (VAD) or transplant. A variety of complications can occur during cannulation, including vessel perforation with bleeding, arterial dissection, distal ischemia, and incorrect location (e.g., venous cannula placed within the artery), but these events occur highly infrequently.^[citation needed] Children Preterm infants are at unacceptably high risk for intraventricular hemorrhage (IVH) if administered ECMO at a gestational age less than 32 weeks.^[19] Infections The prevalence of hospital-acquired infections during ECMO is 10-12% (higher compared to other critically ill patients). Coagulase -negative staphylococci, Candida spp., Enterobacteriaceae and Pseudomonas aeruginosa are the most frequently involved pathogens. ECMO patients display a high incidence of ventilator-associated pneumonia (24.4 cases/1000 ECMO days), with a major role played by Enterobacteriaceae. The infectious risk was shown to increase along the duration of the ECMO run, which is the most important risk factor for the development of infections. Other ECMO-specific factors predisposing to infections include the severity of illness in ECMO patients, the high risk of bacterial translocation from the gut and ECMO-related impairment of the immune system. Another important issue is the microbial colonisation of catheters, ECMO cannulae and the oxygenator.^[20] Types [220px-Veno-arterial_] Veno-arterial (VA) ECMO for cardiac or respiratory failure.^[21] [220px-Veno-venous_] Veno-venous (VV) ECMO for respiratory failure.^[21] There are several forms of ECMO; the two most common are veno-arterial (VA) ECMO and veno-venous (VV) ECMO. In both modalities, blood drained from the venous system is oxygenated outside of the body. In VA ECMO, this blood is returned to the arterial system and in VV ECMO the blood is returned to the venous system. In VV ECMO, no cardiac support is provided. Veno-arterial In veno-arterial (VA) ECMO, a venous cannula is usually placed in the right or left common femoral vein for extraction, and an arterial cannula is usually placed into the right or left femoral artery for infusion.^[22] The tip of the femoral venous cannula should be maintained near the junction of the inferior vena cava and right atrium, while the tip of the femoral arterial cannula is maintained in the iliac artery.^[22] In adults, accessing the femoral artery is preferred because the insertion is simpler.^[22] Central VA ECMO may be used if cardiopulmonary bypass has already been established or emergency re-sternotomy has been performed (with cannulae in the right atrium (or SVC/IVC for tricuspid repair) and ascending aorta). VA ECMO is typically reserved when native cardiac function is minimal to mitigate increased cardiac stroke work associated with pumping against retrograde flow delivered by the aortic cannula. Veno-venous In veno-venous (VV) ECMO, cannulae are usually placed in the right common femoral vein for drainage and right internal jugular vein for infusion.^[23] Alternatively, a dual-lumen catheter is inserted into the right internal jugular vein, draining blood from the superior and inferior vena cavae and returning it to the right atrium. Initiation ECMO should be performed only by clinicians with training and experience in its initiation, maintenance, and discontinuation. ECMO insertion is typically performed in the operating room setting by a cardiothoracic surgeon. ECMO management is commonly performed by a registered nurse, respiratory therapist, or a perfusionist. Once it has been decided to inititiate ECMO, the patient is anticoagulated with intravenous heparin to prevent thrombus formation from clotting off the oxygenator. Prior to initiation, an IV bolus of heparin is given and measured to ensure that the activated clotting time (ACT) is between 300 and 350 seconds. Once the ACT is between this range, ECMO can be initiated and a heparin drip will be started after as a maintenance dose.^[24] Cannulation Cannulae can be placed percutaneously by the Seldinger technique, a relatively straightforward and common method for obtaining access to blood vessels, or via surgical cutdown. The largest cannulae that can be placed in the vessels are used in order to maximize flow and minimize shear stress. ECMO required for complications post-cardiac surgery can be placed directly into the appropriate chambers of the heart or great vessels. Central cannulation via lateral thoracotomy allows patients awaiting lung transplantation to remain unsedated and ambulatory.^[25] Titration Following cannulation and connection to the ECMO circuit, the appropriate amount of blood flow through the ECMO circuit is determined using hemodynamic parameters and physical exam. Goals of maintaining end-organ perfusion via ECMO circuit are balanced with sufficient physiologic blood flow through the heart to prevent stasis and subsequent formation of blood clot. Maintenance [220px-A_Resperatory_Therapist_] A respiratory therapist takes a blood sample from a newborn in preparation for ECMO therapy. Once the initial respiratory and hemodynamic goals have been achieved, the blood flow is maintained at that rate. Frequent assessment and adjustments are facilitated by continuous venous oximetry, which directly measures the oxyhemoglobin saturation of the blood in the venous limb of the ECMO circuit. Special considerations VV ECMO is typically used for respiratory failure, while VA ECMO is used for cardiac failure. There are unique considerations for each type of ECMO, which influence management. Blood flow Near-maximum flow rates are usually desired during VV ECMO to optimize oxygen delivery. In contrast, the flow rate used during VA ECMO must be high enough to provide adequate perfusion pressure and venous oxyhemoglobin saturation (measured on drainage blood) but low enough to provide sufficient preload to maintain left ventricular output. Diuresis Since most people are fluid-overloaded when ECMO is initiated, aggressive diuresis is warranted once the patient is stable on ECMO. Ultrafiltration can be easily added to the ECMO circuit if the patient has inadequate urine output. ECMO "chatter", or instability of ECMO waveforms, represents under-resuscitation and would support cessation of aggressive diuresis or ultrafiltration. Left ventricular monitoring Left ventricular output is rigorously monitored during VA ECMO because left ventricular function can be impaired from increased afterload, which can in turn lead to formation of thrombus within the heart.^[26]^[27] Weaning and discontinuing For those with respiratory failure, improvements in radiographic appearance, pulmonary compliance, and arterial oxyhemoglobin saturation indicate that the person may be ready to be taken off ECMO support. For those with cardiac failure, enhanced aortic pulsatility correlates with improved left ventricular output and indicates that they may be ready to be taken off ECMO support. If all markers are in good status, the blood flows on the ECMO will be slowly decreased and the patients parameters will be observed during this time to ensure that the patient can tolerate the changes. When the flows are below 2 liters per minute, permanent removal is attempted and the patient is continued to be monitored during this time until the cannulae can be removed.^[28] Veno-venous ECMO liberation trial VV ECMO trials are performed by eliminating all countercurrent sweep gas through the oxygenator. Extracorporeal blood flow remains constant, but gas transfer does not occur. They are then observed for several hours, during which the ventilator settings that are necessary to maintain adequate oxygenation and ventilation off ECMO are determined as indicated by arterial and venous blood gas results. Veno-arterial ECMO liberation trial VA ECMO trials require temporary clamping of both the drainage and infusion lines, while allowing the ECMO circuit to circulate through a bridge between the arterial and venous limbs. This prevents thrombosis of stagnant blood within the ECMO circuit. In addition, the arterial and venous lines should be flushed continuously with heparinized saline or intermittently with heparinized blood from the circuit. In general, VA ECMO trials are shorter in duration than VV ECMO trials because of the higher risk of thrombus formation. History ECMO was developed in the 1950s by John Gibbon, and then by C. Walton Lillehei. The first use for neonates was in 1965.^[29]^[30] Banning Gray Lary^[31] first demonstrated that intravenous oxygen could maintain life. His results were published in Surgical Forum in November 1951.^[32] Lary commented on his initial work in a 2007 presentation wherein he writes, "Our research began by assembling an apparatus that, for the first time, kept animals alive while breathing pure nitrogen. This was accomplished with very small bubbles of oxygen injected into the blood stream. These bubbles were made by adding a 'wetting agent' to oxygen being forced through a porcelain filter into the venous blood stream. Shortly after its initial presentation to the American College of Surgeons, this apparatus was reviewed by Walton Lillehei who with DeWall made the first practical heart lung machine that employed a bubble oxygenator. With variations such machines were used for the next twenty years." Society and culture Manufacturers * Republic of Ireland Medtronic^[33] * Germany Maquet^[33] (Getinge Group) * Germany Xenios AG^[33] (Fresenius Medical Care) * Italy Sorin Group^[33] * Japan Terumo^[33] * Japan Nipro^[33] * China MicroPort^[33] Availability [icon] This section needs expansion. You can help by adding to it. ( March 2020) See also: List of countries by hospital beds SS Numbers Country/territory Continent Hospitals Units equipped United StatesUnited North 264 (in States America 2019)^[34] CanadaCanada North 19 (in America 2020)^[35] AustraliaAustralia Oceania 146 (in 2020) ^[36] BrazilBrazil South 21 (in America 2021)^[37] United Kingdom Europe 5 (in 2020) 15 (in 2020)^[38] England and Wales ^[38] Northern Ireland Europe 0 (in 2020) 0 (in 2020)^[39] Northern Ireland ^[39] ScotlandScotland Europe 1 (in 2020) 6 (in 2020)^[39] ^[39] GermanyGermany Europe 214 (in 755 (in 2020)^[41] 2020)^[40] PolandPoland Europe 47 (in 2020)^[42] SwedenSweden Europe 7 or more (in 2020)^[43] AlbaniaAlbania Europe 0 (in 2020) 0 (in 2020)^[44] ^[44] RussiaRussia Europe 124 + 17 (in 2020)^[45] MoscowMoscow Europe 16 (in 2020)^[46] RussiaSaint Europe 7 19 (in 2020)^[47] Petersburg JapanJapan Asia 2208 (in 2020)^[48] ChinaMainland China Asia 400 (approx. in 2020)^[49] 105 (in 2016)^[50] Taiwan Taiwan Asia 51 (in 2016)^[50] 129 (including rental units, in 2016)^[51] Research A 2014 study showed that a factor XIIa inhibitory antibody provides thromboprotection in extracorporeal circulation without increasing bleeding risk.^[52] Experiments on neonatal animals showed that ECMO treatment can lead to apoptosis of enterocytes, damage of the intestinal mucosal barrier and bacterial translocation. This might explain greater severity of systemic inflammatory response syndrome in neonates.^[53] ECMO has also seen its use on cadavers as being able to increase the viability rate of transplanted organs.^[54] References 1. ^ "General Guidelines for all ECLS Cases" (PDF). Extracorporeal Life Support Organization. Retrieved April 15, 2015. 2. ^ State of New Hampshire Patient Care Protocols v7. New Hampshire: NH Medical Control Board. 2018. p. 2.10. 3. ^ Ouweneel, DM; Schotborgh, JV; Limpens, J; Sjauw, KD; Engstrom, AE; Lagrand, WK; Cherpanath, TG; Driessen, AH; de Mol, BA; Henriques, JP (September 19, 2016). "Extracorporeal life support during cardiac arrest and cardiogenic shock: a systematic review and meta-analysis". Intensive Care Medicine. 42 (12): 1922-34. doi:10.1007/s00134-016-4536-8. PMC 5106498. PMID 27647331. 4. ^ "30 to 39 pct of severe COVID-19 patients discharged from Wuhan hospitals: official - Xinhua | English.news.cn". xinhuanet.com. 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February 10, 2020 50. ^ ^a ^b "Quan Tai Bao Xie Ke Mo Huang Yi Hu :Yi Wu Wu Qi Ke Yong !". Liberty Times (in Chinese). March 4, 2016. Archived from the original on June 5, 2021. Retrieved June 5, 2021. 51. ^ "Wei Fu Bu Yu Wei Sheng Ju Yi Qi Dong Liu Gan Ying Bian Yi Yuan Ji Yi Liao Diao Du Ji Zhi ". 105Nian Wei Sheng Fu Li Bu Xin Wen /3Yue Xin Wen (in Chinese). Department of Medical Affairs, Ministry of Health and Welfare (Taiwan). March 4, 2016. Archived from the original on June 5, 2021. Retrieved June 5, 2021. 52. ^ Larsson M, Rayzman V, Nolte MW, et al. (January 2014). "A Factor XIIa Inhibitory Antibody Provides Thromboprotection in Extracorporeal Circulation Without Increasing Bleeding Risk". Sci. Transl. Med. 6 (222): 222. doi:10.1126/scitranslmed.3006804. hdl:10616/42281. PMID 24500405. S2CID 5378607. 53. ^ MohanKumar K (February 2014). "Intestinal epithelial apoptosis initiates gut mucosal injury during extracorporeal membrane oxygenation in the newborn piglet". Lab. Invest. 94 (2): 150-60. doi:10.1038/labinvest.2013.149. PMC 3946757. PMID 24365747. 54. ^ Magliocca, JF; Magee, JC; Rowe, SA; Gravel, MT; Chenault Rh, 2nd; Merion, RM; Punch, JD; Bartlett, RH; Hemmila, MR (2005). "Extracorporeal support for organ donation after cardiac death effectively expands the donor pool". The Journal of Trauma. 58 (6): 1095-101, discussion 1101-02. doi:10.1097/ 01.ta.0000169949.82778.df. PMID 15995454. External links # Wikimedia Commons has media related to Extracorporeal membrane oxygenation. [40px] Scholia has a profile for Extracorporeal membrane oxygenation (Q1385195). * American Thoracic Society, Patient Education: What is ECMO? 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