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Original Article
Five-year Experience of Extracorporeal Life Support in Emergency Physicians
Yong Soo Cho1orcid, Kyoung Hwan Song2, Byung Kook Lee1orcid, Kyung Woon Jeung1orcid, Yong Hun Jung1, Dong Hun Lee1orcid, Sung Min Lee1
Korean Journal of Critical Care Medicine 2017;32(1):52-59.
Published online: February 28, 2017

1Department of Emergency Medicine, Chonnam National University Hospital, Gwangju, Korea

2Department of Emergency Medicine, KS Hospital, Gwangju, Korea

Correspondence to: Byung Kook Lee, Department of Emergency Medicine, Chonnam National University Hospital, 42 Jebong-ro, Dong-gu, Gwangju 61469, Korea Tel: +82-62-220-6809, Fax: +82-62-228-7417, E-mail:
• Received: October 25, 2016   • Revised: December 19, 2016   • Accepted: February 9, 2017

Copyright © 2017 The Korean Society of Critical Care Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Background
    This study aimed to present our 5-year experience of extracorporeal cardiopulmonary resuscitation (ECPR) performed by emergency physicians.
  • Methods
    We retrospectively analyzed 58 patients who underwent ECPR between January 2010 and December 2014. The primary parameter analyzed was survival to hospital discharge. The secondary parameters analyzed were neurologic outcome at hospital discharge, cannulation time, and ECPR-related complications.
  • Results
    Thirty-one patients (53.4%) were successfully weaned from extracorporeal membrane oxygenation, and 18 (31.0%) survived to hospital discharge. Twelve patients (20.7%) were discharged with good neurologic outcomes. The median cannulation time was 25.0 min (interquartile range 20.0-31.0 min). Nineteen patients (32.8%) had ECPR-related complications, the most frequent being distal limb ischemia. Regarding the initial presentation, 52 patients (83.9%) collapsed due to a cardiac etiology, and acute myocardial infarction (33/62, 53.2%) was the most common cause of cardiac arrest.
  • Conclusions
    The survival to hospital discharge rate for cardiac arrest patients who underwent ECPR conducted by an emergency physician was within the acceptable limits. The cannulation time and complications following ECPR were comparable to those found in previous studies.
Cardiac arrest is a leading cause of death, although there is a wide variation in incidence depending on the region [1]. Despite advances in cardiopulmonary resuscitation (CPR) techniques and treatment, many cardiac arrest victims do not respond to resuscitation, resulting in death. Extracoporeal life support (ECLS) is a device that temporarily maintains cardiac and pulmonary function during cardiopulmonary failure, allowing organ recovery time. Chen et al. [2] have suggested ECLS as a therapeutic option in refractory cardiac arrest. However, there is insufficient evidence to recommend its routine use for cardiac arrest, although the American Heart Association recommended ECLS when the “no flow” time was brief and the cause of cardiac arrest was potentially reversible [3].
Several studies have been performed on ECLS use in cases of out-of-hospital cardiac arrest (OHCA) [4-7]. Kagawa et al. [8] reported that the difference in ECLS outcomes between in-hospital cardiac arrest (IHCA) and OHCA is associated with patient factors and the time delay in starting ECLS because there was no difference in outcomes after adjusting for these factors. To reduce the delay in treatment, rapid access to the patient is essential. ECLS performed by emergency physicians can provide such rapidity, but there is little research on the efficacy of this strategy. Therefore, we aim to describe our experiences with extracorporeal CPR (ECPR) performed by emergency physicians over a 5-year period.
1) Design and setting
This was a retrospective, observational, cohort study using medical records of patients treated with ECPR from January 2010 to December 2014. This study was approved by the Institutional Review Board of Chonnam National University Hospital (CNUH), a university-affiliated, 1,005-bed, tertiary-care hospital in Gwangju, Korea. The facility contains an urban emergency department (ED) with approximately 45,000 annual visits. CNUH was designated for 24/7 emergency percutaneous coronary intervention as well as therapeutic hypothermia.
2) Patient selection
All patients who underwent ECPR performed by an emergency physician in the ED, intensive care unit, or cardiac catheterization room were included in this study. ECLS was performed if patients were younger than 75 years and experiencing either IHCA, defined as persistent cardiopulmonary arrest with a reversible cause despite advanced cardiac life support (ACLS) for 15 minutes, or OHCA, defined as sustained ventricular fibrillation (VF) cardiac arrest despite 30 minutes of resuscitation effort (including basic life support and ACLS) [9]. The exclusion criteria were as follows: (1) unwitnessed cardiac arrest, (2) major preexisting medical comorbidities, (3) aortic dissection, (4) aortic insufficiency, (5) recent cerebrovascular accident, and (6) traumatic cardiac arrest.
3) CPR and ECLS management
If spontaneous circulation did not return when ACLS was continued per the guidelines, the attending emergency physicians decided on the initiation of ECPR per the inclusion and exclusion criteria. While traditional resuscitation efforts continued, the emergency physician either cannulated the femoral artery and vein using a modified Seldinger technique after performing a percutaneous puncture or, less commonly, performed direct exposure of the femoral vessels followed by cannulation. Typically, a 16-Fr (artery) and 20- to 22-Fr (vein) cannula (Edwards Life Science, Irvine, CA, USA) were inserted. When cannulation was complete, bypass tubing was connected to the arterial and venous cannulas, and flow and oxygenation were optimized using a centrifugal pump and hollow-fiber oxygenator (Capiox, Terumo Corp., Tokyo, Japan), respectively. Once adequate flow through the ECLS circuit was achieved, CPR was stopped. At that point, 5,000 units of unfractionated heparin were administered to maintain an activated clotting time of approximately 180-220 s per patient. Chest radiography was performed after cannulation to verify adequate cannula placement. Percutaneous coronary angiogram and/or intervention, insertion of an intra-aortic balloon pump, and target-temperature management were performed as needed. An anterograde reperfusion catheter for distal limb perfusion was inserted if distal limb ischemia was suspected. After ECLS initiation, the emergency physician titrated the oxygenation to achieve a partial oxygen pressure (PaO2) ≤ 150 mmHg, as determined by blood-gas tests of the arterial-tubing blood. The pump flow was initiated at 2.5 L/m2 , and a vasopressor (norepinephrine or dopamine) was used to maintain a mean blood pressure of at least 60 mmHg. ECLS weaning was based on echocardiographic and physiologic assessments. The weaning criteria (i.e., when the flow was reduced to 0.5 L/min) were (1) improvement of the ejection fraction on echocardiographic assessment, (2) mixed venous oxygen saturation ≥ 70%, or (3) no deterioration of the base excess on arterial blood gas analysis, which was conducted every 4-6 hours. We attempted to maintain the mixed venous oxygen saturation and base excess as close to the normal range as possible, and the final weaning decision was determined by echocardiography [10]. The decision to discontinue ECLS support was based on evidence of either multi-organ failure, overwhelming sepsis, or severe neurological injury.
4) Data and statistical analysis
A chart review was performed on cardiac arrest patients treated with ECLS by an emergency physician, and the relevant clinical data were abstracted from inpatient records. Basic clinical information, cause of arrest, treatment, and outcome data were retrieved and collected from the patients’ medical charts.
An arrest is presumed to be of cardiac etiology unless it is known or likely to have been caused by trauma, submersion, drug overdose, asphyxia, exsanguination, or any other noncardiac cause as best determined by rescuers [11]. The cardiac etiology was divided into myocardial infarction, heart failure, primary VF, pulmonary thromboembolism, and myocarditis depending on clinical diagnosis.
The cannulation time was calculated from the initiation time to the end of cannulation. The primary parameter analyzed was survival to hospital discharge. The secondary parameters analyzed were neurologic outcome at hospital discharge, cannulation time, and ECLS-related complication. The neurologic outcome was assessed using the Glasgow-Pittsburgh Cerebral Performance Categories (CPC) at discharge, recorded as CPC 1 (good performance), CPC 2 (moderate disability), CPC 3 (severe disability), CPC 4 (vegetative state), and CPC 5 (brain death or death) [12]. A good neurologic outcome was defined as a CPC of 1 or 2.
Statistical analysis was performed using SPSS version 19.0 (SPSS Inc., Chicago, IL, USA). The continuous variables were expressed as the mean and standard deviation or the median and interquartile range (IQR) based on normality. The categorical variables are displayed as frequency distributions (n) and simple percentages (%). Non-normally distributed continuous variables were compared using the Mann-Whitney U test. Statistical significance was defined as p < 0.05.
Between January 2010 and December 31, 2014, there were 62 ECLS team activations. The basic population characteristics are shown in Table 1. The youngest patient was 14 years old. All patients were cannulated via the femoral artery and femoral vein. Fifty-two patients (83.9%) collapsed due to a cardiac etiology, which consisted of myocardial infarction, heart failure, primary VF, pulmonary thromboembolism, and myocarditis. The most common cardiac etiology was acute myocardial infarction in 33 (63.5%) of the 52 cardiac patients. VF was the most common first monitored rhythm, found in 26 (41.9%) of the 62 total patients.
The clinical outcomes of patients who underwent ECPR are shown in Table 2. Of the 62 patients who received ECLS, 18 (29%) survived to hospital discharge. Cannulation failed in 4 patients; of the remaining 58 patients, 12 (20.7%) had a good neurologic outcome at discharge (CPC of 1 or 2). Of the total 62 patients, 31 (53.4%) were successfully weaned from ECLS. Of those who died after ECLS, persistent cardiac dysfunction (25/40) was the most common cause of death. However, 13 patients died after weaning from ECLS, 5 due to sepsis.
The median cannulation time was 25.0 minutes in our study. There was no significant difference with regard to cannulation time between the survivor and non-survivor groups (25.0 min [IQR 20.0-30.0] vs. 21.0 min [IQR 18.8-36.3], p = 0.624).
Among the 62 patients, 19 patients (32.8%) experienced ECLS-related complications. The most common complication was distal limb ischemia. Of these patients, 3 were treated with anterograde reperfusion therapy. Of the 5 patients who demonstrated vascular injury, 2 had retroperitoneal hemorrhage, 1 developed a femoral arteriovenous fistula that was treated with radiologic intervention, 1 had a femoral artery laceration that was treated with surgical repair, and 1 developed a femoral artery pseudoaneurysm. Four patients experienced cannulation site bleeding or hematoma.
The reported rates of survival to discharge after ECPR vary from 27.0 to 34.1% [13-15]. According to an ECLS organization registry report in 2012, the overall rate of survival to discharge for adult ECPR patients is 27.0% [13]. Chen et al. [14] and Haneya et al. [15] reported survival to hospital discharge rates of 32.0% and 34.1%, respectively, after ECPR for IHCA. The survival rate of 29% found in this study was somewhat lower than that found in previous studies. However, considering the inclusion of OHCA patients in this study, the survival to hospital discharge could be accepted as comparable with those of previous studies.
Surgical vascular access has been traditionally performed for cannulation for ECLS. However, a previous report showed the success of a percutaneous technique in ECLS [16]. Another report demonstrated femoral cannulation for ECLS support to be useful when conditions are not optimal for performing femoral vessel cutdown [17]. Percutaneous cannulation has several advantages over surgical cutdown. It can reduce the risk of bleeding, has a shorter operation time, and reduces infection risk. For these reasons, the percutaneous technique is considered a standard cannulation method in ECLS. Additionally, this method can be performed by either a surgeon or a nonsurgeon. Chen et al. [18] reported that a surgeon typically requires less than 30 minutes to set up the ECLS using a modified Seldinger technique. One article reported the mean cannulation time to be approximately 30 minutes [19], but there is insufficient research data about cannulation times in ECLS procedures performed by emergency physicians. Despite the difficulty of performing cannulation during CPR, the cannulation time in the present study was similar to that in previous studies. Therefore, cannulation time should not be considered an obstacle to ECLS performed by an emergency physician.
During ECLS, several ECLS-related complications can occur, such as leg ischemia, bleeding, and vessel injury. The reported rates of ECLS-related complications are variable [15,20-22]. Haneya et al. [15] reported that 33% of all patients had ECLS-related complications. Similarly, in our study population, 19 patients (32.8%) showed ECLS-related complications. Aziz et al. [20] reported a 17.8% vascular complication rate. Among these, acute ischemia of the lower extremities was the most common complication, accounting for 44.4% of vascular complications [20]. Similarly, in our study, distal leg ischemia was the most common complication. To prevent this complication, it is necessary to consider prompt prophylactic insertion of an anterograde reperfusion catheter into the femoral artery [23].
Another common complication of ECLS is bleeding. Kurusz and Zwischenberger [21] reported cannulation-related bleeding rates ranging from 4% to 14%. Anticoagulation is necessary to prevent coagulation associated with either the catheter or the ECLS circuit. However, this may lead to a hemorrhagic complication. Furthermore, multiple vessel punctures during cannulation, decreased platelet function, and thrombocytopenia may induce bleeding complications. In this study, 4 patients showed cannulation site bleeding or hematoma.
In our study, 5 patients (8%) experienced vascular injury, 2 of whom required surgical treatment or intervention. Conrad et al. [24] reported that 2 of 100 patients with severe respiratory and/or cardiac failure had failed cannulation due to vascular injury. Schwarz et al. [22] reported that cannulation-related vascular injury was found in 8% of cardiogenic shock patients and in 19% of cardiac arrest patients. Recently published studies that included only ECPR reported 5.5 to 13% prevalence rates of cannulation-related vascular injury [25,26]. Therefore, cardiac arrest is thought to affect the incidence of vascular injury. It is difficult to perform the cannulations needed for ECLS during CPR for several possible reasons. First, it is hard to identify the femoral vessels because cardiac arrest patients have no pulse. Second, chest compression can interfere with the puncture of vessels and insertion of the cannula. More effort is required to reduce the incidence of cannulation-related vascular injury, and the sono-guided puncture technique is recommended as part of this goal [24].
It is critical to reduce the initiation of extracoporeal membrane oxygenation (ECMO) time after collapse in cardiac arrest. The CPR mechanical, hypothermia, ECMO, emergency, and reperfusion trial reported that patients who survived cardiac arrest had a significantly shorter median time of collapse to initiation of ECMO compared with the non-survivors [27]. Emergency physicians encounter critically ill patients on the frontline. Implementation of the appropriate treatment in these critical moments could save a patient’s life. A recent study demonstrated that ECLS can be used a rescue procdure in adult OHCA or cardaic arrest patients in the ED who are not responsive to conventional CPR [28]. Another reported that emergency physicians can successfully initiate ECLS without compromising the optimal traditional resuscitative techniques [29].
In our study, the main cause of death in patients who died after ECLS was persistent cardiac dysfunction (25/40). In those patients who regain consciousness, use of a ventricular assist device or heart transplantation should be considered. Unfortunately, this surgery is not generally performed in our hospital.
Our study had several limitations, the main one being that it was a retrospective, observational study. Several of the medical documents were either incompletely or illegibly recorded. Consequently, some patient data could not be retrieved. Additionally, this retrospective design had no control group, possibly resulting in selection bias. Another limitation is that this study was performed in a single center; accordingly, the results cannot be generalized across centers. Finally, the number of patients is relatively small, making statistical analysis difficult.
The survival to hospital discharge rate, cannulation time, and occurrence of complications following ECPR performed by emergency physicians were comparable with those found in previous studies. Our experiences suggest that it is feasible for emergency physicians to implement ECPR for cardiac arrest. More studies are required to evaluate the cost-effectivenss, patients selection, and prognostication of ECPR.

No potential conflict of interest relevant to this article was reported.

The study was performed in accordance with the ethical standards of the Declaration of Helsinki and was approved by the institutional review board of CNUH.
Table 1.
Baseline characteristics of cardiac arrest patients (n = 62)
Variable Values
Age (years) 57.1 ± 15.9
 Male:Female 46 (74.2):16 (25.8)
Arrest rhythm
 Ventricular fibrillation 26 (41.9)
 Asystole 11 (17.7)
 Pulseless electrical activity 10 (16.1)
 Pulseless ventricular tachycardia 4 (6.5)
 Unknown 11 (17.7)
Site of cardiac arrest
 In hospital 34 (54.8)
 Out of hospital 28 (45.2)
Cause of arrest
 Cardiac 52 (83.9)
  Acute myocardial infraction 33 (53.2)
  Heart failure 8 (12.9)
  Primary ventricular fibrillation 5 (8.1)
  Pulmonary thromboembolism 4 (6.5)
  Myocarditis 2 (3.2)
 Drug 7 (11.3)
 Drowning 1 (1.6)
 Unknown 2 (3.2)
CPR duration, median (25th to 75th IQR) (minute) 42 (26.0-61.0)
ACLS duration, median (25th to 75th IQR) (minute) 38.0 (20.50-55.0)
Therapeutic hypothermia 49 (79.0)
Result of percutaneous coronary intervention
 Not performed 28 (45.2)
 Stenosis 25 (40.3)
 No stenosis 6 (9.7)
 No stenosis with spasm 3 (4.8)

Values are presented as mean ± standard deviation or n (%) unless otherwise indicated.

CPR: cardiopulmonary resuscitation; IQR: interquartile range; ACLS: advanced cardiac life support.

Table 2.
Clinical outcomes of patients who underwent ECPR
Variable Values
Primary outcome (n = 62)
 Survival to discharge 18 (29.0)
Secondary outcome (n = 58)
Cannulation time, median (25th to 75th IQR) (minute) 25.0 (20.0-31.0)
ICU stay, median (25th to 75th IQR) (day) 7.5 (2.0-17.0)
Hospital stay, median (25th to 75th IQR) (day) 10.0 (2.0-30.5)
ECLS duration, median (25th to 75th IQR) (day) 3.0 (2.0-5.0)
Weaned off ECMO 31 (53.4)
Discharge CPC
 1-2 12 (20.7)
 3-5 46 (79.3)
ECLS-related complication 19 (32.8)
 Distal limb ischemia 7 (12.1)
 Vascular injury 5 (8.6)
 Cannulation site bleeding or hematoma 4 (6.9)
 Others 3 (5.2)

Values are presented as n (%) unless otherwise indicated.

ECPR: extracorporeal cardiopulmonary resuscitation; IQR: interquartile range; ICU: intensive care unit; ECLS: extracorporeal life support; ECMO: extracoporeal membrane oxygenation; CPC: cerebral performance category.

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