Extra-corporeal membrane oxygenation for refractory cardiogenic shock after adult cardiac surgery: a systematic review and meta-analysis

Efficacy and safety of Impella 5.0 in cardiogenic shock: an updated systematic review

Aim: The impact on safety and efficacy outcomes of Impella 5.0 in cardiogenic shock (CS) has not been systematically assessed. Materials & methods: We conducted a systematic review of the literature (PROSPERO protocol: CRD42020164680) to critically appraise available evidence on Impella 5.0 comparative safety, efficacy and effectiveness. Results: Of 244 retrieved citations, 17 original articles met the a priori defined inclusion criteria. All included studies had a retrospective study design and, overall, reported on, respectively, 52 and 67 different safety and efficacy/effectiveness outcomes. Thirty-day survival rates ranged from 40 to 94%, myocardial recovery from 18 to 93%. Conclusion: Impella 5.0 provides a full cardiac support, it is associated with a lower rate of vascular complications, it represents a valuable bridge-to-decision and allows for resolution of intercurrent clinical conditions. As available data suggest Impella 5.0 good performance in CS of various etiologies, more solid evidence will come from much-needed large-scale all-comer registries and prospective multicenter randomized trials.

Risk Factors for Postoperative Mortality in Patients with Acute Stanford Type A Aortic Dissection

OBJECTIVE

The present study explored the risk factors of postoperative mortality in patients with acute Stanford type A aortic dissection (AD).

METHODS

The study included 149 patients with acute Stanford type A AD who were treated at the Fourth Hospital of Hebei Medical University, China, from October 2016 to October 2018. The patients were divided into a death (n = 42) and survival group (n = 107) according to individual prognosis. Univariate analysis of all possible related risk factors was conducted; multivariate logistic regression analysis of the potential risk factors that showed statistical differences in the univariate analysis was also performed.

RESULTS

The results of the univariate analysis showed that a body mass index (BMI) ≥25 kg/m2, surgery duration, duration of cardiopulmonary bypass, duration of cardiopulmonary bypass assistance, total transfusion of red blood cells, postoperative APACHE II score, sequential organ failure assessment (SOFA) score, low cardiac output, acute kidney injury (AKI), hypoxemia, diffuse intravascular coagulation (DIC), hepatic failure and other related complications, as well as postoperative stay duration in the intensive care unit (ICU), were closely correlated with a poor prognosis among patients. Multivariate logistic regression analysis showed that a BMI ≥25 kg/m2, SOFA score >8, duration of cardiopulmonary bypass assistance >70 minutes, postoperative low cardiac output, and postoperative DIC were independent risk factors for postoperative death in patients with acute Stanford type A AD.

CONCLUSION

A BMI ≥25 kg/m2, SOFA score >8, duration of cardiopulmonary bypass assistance >70 min, postoperative DIC, and postoperative low cardiac output were the independent risk factors for postoperative death in acute Stanford type A AD. Intraoperative blood transfusion, postoperative hepatic failure, and AKI, among others, correlated with an increased risk of death but were not independent risk factors for death.

Postcardiotomy Extracorporeal Membrane Oxygenation: Narrative Review Navigating the Ethical Issues

Postcardiotomy shock (PCS) is an uncommon and life-threatening surgical complication. Extracorporeal membrane oxygenation (ECMO) is the first line of mechanical circulatory support for treating PCS when medical therapies are insufficient. Reaching a "therapeutic ceiling" or a "bridge to nowhere" is a common clinical scenario in which medical avenues for recovery have been exhausted. These situations pose emotional and ethical challenges for patients, their surrogates, and clinicians. To shed light on these ethically challenging situations in PCS and potential approaches, the authors conducted a narrative review of the literature. Publications were utilized to describe current trends in the diagnosis and management of the patient with PCS, with particular emphasis on the therapeutic ceiling for life support. Most of the recommendations came from practice parameters or expert opinions to support specific interventions. The authors proposed a stepwise multidisciplinary approach to reduce PCS-associated ethical and emotional challenges. Their proposed algorithm was based on the likelihood of the need for ECMO support based on the mortality risk stratification of cardiac surgery. They suggested focused discussions around the commencement of ECMO or other life-sustaining therapies-ideally preoperatively at the time of consent-through shared decision-making and, subsequently, proactive multidisciplinary education and updates to the surrogate decision-makers relying on realistic prognosis and consideration of the patient wishes during the ECMO run.

Levosimendan to Facilitate Weaning From Cardiorespiratory Support in Critically Ill Patients: A Meta-Analysis

Background: Cardiopulmonary support, as extracorporeal membrane oxygenation (ECMO) or mechanical ventilation (MV), is crucial for ICU patients. However, some of these patients are difficult to wean. Therefore, we aimed to assess the efficacy and safety of levosimendan in facilitating weaning from cardiorespiratory support in this patient population. Methods: We searched for potentially relevant articles in PubMed, Embase, China National Knowledge Infrastructure, Wanfang, and the Cochrane database from inception up to Feb 30, 2021. Studies focusing on weaning data in MV/ECMO adult patients who received levosimendan compared to controls were included. We used the Cochrane risk of bias tool or the Newcastle-Ottawa Quality Assessment Scale to evaluate the study quality. The primary outcome was the weaning rate from MV/ECMO. Secondary outcomes were mortality, duration of MV, and ICU stay. Subgroup analysis, sensitivity analysis, and publication bias were also conducted. Results: Eighteen studies with 2,274 patients were included. The quality of the included studies was low to moderate. Overall, levosimendan effectively improved weaning rates from MV/ECMO [odds ratio (OR) = 2.32; 95%CI, 1.60-3.36; P < 0.00001, I 2 = 68%]. Subgroup analyses confirmed the higher successful weaning rates in ventilated patients with low left ventricular ejection fractions (OR = 4.06; 95%CI, 2.16-7.62), patients with ECMO after cardiac surgery (OR = 2.04; 95%CI, 1.25-3.34), and patients with ECMO and cardiogenic shock (OR = 1.98; 95%CI, 1.34-2.91). However, levosimendan showed no beneficial effect on patients with MV weaning difficulty (OR = 2.28; 95%CI, 0.72-7.25). Additionally, no differences were found concerning the secondary outcomes between the groups. Conclusions: Levosimendan therapy significantly increased successful weaning rates in patients with cardiopulmonary support, especially patients with combined cardiac insufficiency. Large-scale, well-designed RCTs will be needed to define the subgroup of patients most likely to benefit from this strategy.

Short-term and intermediate outcomes of cardiogenic shock and cardiac arrest patients supported by venoarterial extracorporeal membrane oxygenation

Background

Cardiogenic shock and cardiac arrest are life-threatening emergencies with high mortality rates. Veno-arterial extracorporeal membrane oxygenation (VA ECMO) and extracorporeal cardiopulmonary resuscitation (e-CPR) provide viable options for life sustaining measures when medical therapy fails. The purpose of this study is to determine the utilization and outcomes of VA ECMO and eCPR in patients that require emergent cardiac support at a single academic center.

Methods

A retrospective chart review of prospectively collected data was performed at an academic institution from January 1st, 2018 to June 30th, 2020. All consecutive patients who required VA ECMO were evaluated based on whether they underwent traditional VA ECMO or eCPR. The study variables include demographic data, duration on ECMO, length of stay, complications, and survival to discharge.

Results

A total of 90 patients were placed on VA ECMO for cardiac support with 44.4% (40) of these patients undergoing eCPR secondary to cardiac arrest and emergent placement on ECMO. A majority of the patients were male (n = 64, 71.1%) and the mean age was 58.8 ± 15.8 years. 44.4% of patients were transferred from outside hospitals for a higher level of care and 37.8% of patients required another primary therapy such as an Impella or IABP. The most common complication experienced by patients was bleeding (n = 41, 45.6%), which occurred less often in eCPR (n = 29, 58% vs. n = 12, 30%). Other complications included infections (n = 11, 12.2%), limb ischemia (n = 13, 14.4%), acute kidney injury (n = 17, 18.9%), and cerebral vascular accident (n = 4, 4.4%). The length of stay was longer for patients on VA ECMO (32.1 ± 40.7 days vs. 17.7 ± 18.2 days). Mean time on ECMO was 8.1 ± 8.3 days. Survival to discharge was higher in VA ECMO patients (n = 23, 46% vs. n = 8, 20%).

Conclusion

VA ECMO provided an effective rescue therapy in patients in acute cardiogenic shock with a survival greater than the expected ELSO guidelines of 40%. While the survival of eCPR was lower than expected, this may reflect the severity of patient’s condition and emphasizes the importance of careful patient selection and planning.

SEDAR/SECCE ECMO management consensus document

ECMO is an extracorporeal cardiorespiratory support system whose use has been increased in the last decade. Respiratory failure, postcardiotomy shock, and lung or heart primary graft failure may require the use of cardiorespiratory mechanical assistance. In this scenario perioperative medical and surgical management is crucial. Despite the evolution of technology in the area of extracorporeal support, morbidity and mortality of these patients continues to be high, and therefore the indication as well as the ECMO removal should be established within a multidisciplinary team with expertise in the area. This consensus document aims to unify medical knowledge and provides recommendations based on both the recent bibliography and the main national ECMO implantation centres experience with the goal of improving comprehensive patient care.

Utilization and outcomes of postcardiotomy mechanical circulatory support

BACKGROUND

This study evaluated the utilization and outcomes of postcardiotomy mechanical circulatory support (MCS).

METHODS

This was a retrospective, single institution analysis of adult cardiac surgery cases that required de novo MCS following surgery from 2011 to 2018. Patients that were bridged with MCS to surgery were excluded. The primary outcomes were early operative mortality and longitudinal survival. Secondary outcomes included postoperative complications, and 5-year all-cause readmission.

RESULTS

Five hundred and thirty-three patients required de novo postcardiotomy MCS, with the most commonly performed procedure being isolated coronary artery bypass grafting (29.8%). Median cardiopulmonary bypass and cross-clamp times were 185 (IQR 123-260) min and 122 (IQR 81-179) min, respectively. A total of 442 (82.9%) of patients were supported with intra-aortic balloon pump counterpulsation, 23 (4.3%) with an Impella device, and 115 (21.6%) with extracorporeal membrane oxygenation. Three (0.6%) patients had an unplanned ventricular assist device placed. Operative mortality was 29.8%. Longitudinal survival was 56.1% and 43.0% at 1 and 5 years, respectively. Survival was lowest in those supported with ECMO and highest with those supported with an Impella (p < 0.001). Freedom from readmission was 61.4% at 5 years. Postoperative ECMO was an independent predictor of mortality (HR 5.1, 95% CI 2.0-12.9, p < 0.001), but none of the MCS types predicted long-term hospital readmission after risk adjustment.

CONCLUSIONS

Postcardiotomy MCS is associated with high operative mortality. Even patients that survive to discharge have compromised longitudinal survival, with nearly only half surviving to 1 year. Close follow-up and early referral to advanced heart failure specialists may be prudent in improving these outcomes.

Application of alpha1-antitrypsin in a rat model of veno-arterial extracorporeal membrane oxygenation

Extracorporeal membrane oxygenation (ECMO) is a life-saving intervention for patients suffering from respiratory or cardiac failure. The ECMO-associated morbidity and mortality depends to a large extent on the underlying disease and is often related to systemic inflammation, consecutive immune paralysis and sepsis. Here we tested the hypothesis that human α1-antitrypsin (SERPINA1) due to its anti-protease and anti-inflammatory functions may attenuate ECMO-induced inflammation. We specifically aimed to test whether intravenous treatment with α1-antitrypsin reduces the release of cytokines in response to 2 h of experimental ECMO. Adult rats were intravenously infused with α1-antitrypsin immediately before starting veno-arterial ECMO. We measured selected pro- and anti-inflammatory cytokines and found, that systemic levels of tumor necrosis factor-α, interleukin-6 and interleukin-10 increase during experimental ECMO. As tachycardia and hypertension developed in response to α1-antitrypsin, a single additional bolus of fentanyl and midazolam was given. Treatment with α1-antitrypsin and higher sedative doses reduced all cytokine levels investigated. We suggest that α1-antitrypsin might have the potential to protect against both ECMO-induced systemic inflammation and immune paralysis. More studies are needed to corroborate our findings, to clarify the mechanisms by which α1-antitrypsin inhibits cytokine release in vivo and to explore the potential application of α1-antitrypsin in clinical ECMO.

Quality of Life Following Urgent LVAD Implantation for ECMO Therapy in Cardiogenic Shock: A Long-Term Follow-Up

Background and Objectives: Over the past decade, veno-arterial extracorporeal membrane oxygenation (VA-ECMO) has developed into a mainstream treatment for refractory cardiogenic shock (CS) to maximal conservative management. Successful weaning of VA-ECMO may not be possible, and bridging with further mechanical circulatory support (MCS), such as urgent implantation of a left ventricular assist device (LVAD), may represent the only means to sustain the patient haemodynamically. In the recovery phase, many survivors are not suitably prepared physically or psychologically for the novel issues encountered during daily life with an LVAD. Materials and Methods: A retrospective analysis of our institutional database between 2012 and 2019 was performed to identify patients treated with VA-ECMO for CS who underwent urgent LVAD implantation whilst on MCS. Post-cardiotomy cases were excluded. QoL was assessed prospectively during a routine follow-up visit using the EuroQol-5 dimensions-5 level (EQ-5D-5L) and the Patient Health Questionnaire (PHQ-9) surveys. Results: Among 126 in-hospital survivors of VA-ECMO therapy due to cardiogenic shock without prior cardiac surgery, 31 (24.6%) urgent LVAD recipients were identified. In 11 (36.7%) cases, cardiopulmonary resuscitation (CPR) was performed (median 10, range 1–60 min) before initiation of VA-ECMO, and in 5 (16.7%) cases, MCS was established under CPR. Mean age at LVAD implantation was 51.7 (+/−14) years and surgery was performed after a mean 12.1 (+/−8) days of VA-ECMO support. During follow-up of 46.9 (+/−25.5) months, there were 10 deaths after 20.4 (+/−12.1) months of LVAD support. Analysis of QoL questionnaires returned a mean EQ-5D-5L score of 66% (+/−21) of societal valuation for Germany and a mean PHQ-9 score of 5.7 (+/−5) corresponding to mild depression severity. When compared with 49 elective LVAD recipients without prior VA-ECMO therapy, there was no significant difference in QoL results. Conclusions: Patients requiring urgent LVAD implantation under VA-ECMO support due to CS are associated with comparable quality of life without a significant difference from elective LVAD recipients. Close follow-up is required to oversee patient rehabilitation after successful initial treatment.

Venoarterial Extracorporeal Membrane Oxygenation for Postcardiotomy Shock-Analysis of the Extracorporeal Life Support Organization Registry

OBJECTIVES

Refractory postcardiotomy cardiogenic shock complicating cardiac surgery yields nearly 100% mortality when untreated. Use of venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock has increased worldwide recently. The aim of the current analysis was to outline the trends in use, changing patient profiles, and in-hospital outcomes including complications in patients undergoing venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock.

DESIGN

Analysis of extracorporeal life support organization registry from January 2010 to December 2018.

SETTING

Multicenter worldwide registry.

PATIENTS

Seven-thousand one-hundred eighty-five patients supported with venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock.

INTERVENTIONS

Venoarterial extracorporeal membrane oxygenation.

MEASUREMENTS AND MAIN RESULTS

Hospital death, weaning from extracorporeal membrane oxygenation, hospital complications. Mortality predictors were assessed by multivariable logistic regression. Propensity score matching was performed for comparison of peripheral and central cannulation for extracorporeal membrane oxygenation. A significant trend toward more extracorporeal membrane oxygenation use in recent years (coefficient, 0.009; p < 0.001) was found. Mean age was 56.3 ± 14.9 years and significantly increased over time (coefficient, 0.513; p < 0.001). Most commonly, venoarterial extracorporeal membrane oxygenation was instituted after coronary artery bypass surgery (26.8%) and valvular surgery (25.6%), followed by heart transplantation (20.7%). Overall, successful extracorporeal membrane oxygenation weaning was possible in 4,520 cases (56.4%), and survival to hospital discharge was achieved in 41.7% of cases. In-hospital mortality rates remained constant over time (coefficient, -8.775; p = 0.682), whereas complication rates were significantly reduced (coefficient, -0.009; p = 0.003). Higher mortality was observed after coronary artery bypass surgery (65.4%), combined coronary artery bypass surgery with valve (68.4%), and aortic (69.6%) procedures than other indications. Lower mortality rates were observed in heart transplantation recipients (46.0%). Age (p < 0.001), central cannulation (p < 0.001), and occurrence of complications while on extracorporeal membrane oxygenation were independently associated with poorer prognosis.

CONCLUSIONS

The analysis confirmed increased use of venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock. Mortality rates remained relatively constant over time despite a decrease in complications, in the setting of supporting older patients.

Analysis of the 2020 EACTS/ELSO/STS/AATS Expert Guidelines on the Management of Adult Postcardiotomy Extracorporeal Life Support

Extracorporeal life support (ECLS), also known as extracorporeal membrane oxygenation (ECMO), increasingly is used in postcardiotomy (PC) shock to facilitate a bridge to sustained recovery, long-term mechanical support, or heart transplantation. Given increasing prevalence and complexity of PC-ECLS, a joint expert consensus guideline was created in 2020 for management of adult PC-ECLS by the European Association for Cardio-Thoracic Surgery (EACTS), the Extracorporeal Life Support Organization (ELSO), the Society of Thoracic Surgeons (STS), and the American Association of Thoracic Surgery (AATS). The aim of this analysis was to comprehensively review the expert consensus guidelines, with particular emphasis on PC-ECLS candidacy, timing, cannula configuration, left ventricular distention, anticoagulation, ECLS weaning, and intensive care unit complications. This analysis finds the expert consensus guideline to be timely, pertinent, and clinically valuable, although there remains the need for larger clinical trials to codify best practices.

Novel strategy for improved outcomes of extra-corporeal membrane oxygenation as a treatment for refractory post cardiotomy cardiogenic shock in the current era: a refreshing new perspective

OBJECTIVES

Post-cardiotomy cardiogenic shock is an infrequent but important cause of death following cardiac surgery. Extra-corporeal membrane oxygenation offers the opportunity for temporary cardiovascular support and myocardial rest, with a view to recovery. We examine our results with our recently-implemented management algorithm.

METHODS

We report our series of 15 consecutive patients out of 357 patients [4.2%] who required institution of veno-arterial extra-corporeal membrane oxygenation system support as treatment for Post-cardiotomy cardiogenic shock in the current era [January-2017 to January-2020].

RESULTS

The mean age was 64.3 ± 11.6 years (range: 40-82 years); there were 13 males (86.7%). Duration of veno-arterial extra-corporeal membrane oxygenation support was 6.7 ± 1.9 days. Duration of stay on intensive care unit [ICU] was 18.9 ± 17.1 days. Duration of hospital-stay was 28.3 ± 20.8 days. Survival to discharge and at 2.2 ± 0.9 years was 67%.

CONCLUSIONS

We have shown clearly that veno-arterial extra-corporeal membrane oxygenation is an important rescue option for patients who develop refractory post-cardiotomy cardiogenic shock, with improved survival of 67% at 2.2 ± 0.9 years in those placed on post-cardiotomy veno-arterial extra corporeal membrane oxygenation support, which is superior to that reported hitherto in literature. We have sought to highlight the successes of post cardiotomy veno-arterial extra corporeal membrane oxygenation support, with improved results, based on careful patient selection, as well as diligent management of these critically-ill patients in the postoperative period, prior to establishment of irreversible end-organ dysfunction. Our strategy has also helped us rationalize and optimize the use of this expensive treatment modality.

Risk factors and prognosis of nosocomial pneumonia in patients undergoing extracorporeal membrane oxygenation: a retrospective study

Objective

We aimed to examine the risk factors and prognosis of nosocomial pneumonia (NP) during extracorporeal membrane oxygenation (ECMO).

Methods

We retrospectively analyzed data of patients who received ECMO at the Affiliated Hangzhou Hospital of Nanjing Medical University between January 2013 and August 2019. The primary outcome was the survival-to-discharge rate.

Results

Sixty-nine patients who received ECMO were enrolled, median age 42 years and 26 (37.7%) women; 14 (20.3%) patients developed NP. The NP incidence was 24.7/1000 ECMO days. Patients with NP had a higher proportion receiving veno-venous (VV) ECMO (50% vs. 7.3%); longer ECMO support duration (276 vs. 140 hours), longer ventilator support duration before ECMO weaning (14.5 vs. 6 days), lower ECMO weaning success rate (50.0% vs. 81.8%), and lower survival-to-discharge rate (28.6% vs. 72.7%) than patients without NP. Multivariable analysis showed independent risk factors that predicted NP during ECMO were ventilator support duration before ECMO weaning (odds ratio [OR] = 1.288; 95% confidence interval [CI]: 1.111–1.494) and VV ECMO mode (OR = 10.970; 95% CI: 1.758–68.467).

Conclusion

NP during ECMO was associated with ventilator support duration before ECMO weaning and VV ECMO mode. Clinicians should shorten the respiratory support duration for patients undergoing ECMO to prevent NP.

Obesity is not a contraindication to veno-arterial extracorporeal life support

OBJECTIVES

Obesity may complicate the peripheral cannulation and delivery of veno-arterial extracorporeal life support (ECLS). With rising global body mass indices (BMI), obesity is becoming increasingly prevalent in severe cardiogenic shock yet its impact on outcomes is not well described. This study sought to examine the relationship between BMI and veno-arterial ECLS outcomes to better inform clinical decision-making.

METHODS

All cardiogenic shock patients undergoing peripheral veno-arterial ECLS at our institution from March 2008 to January 2019 were retrospectively analysed (n = 431). Patients were divided into 4 groups, BMI 17.5-24.9, 25-29.9, 30-34.9 and ≥35 kg/m2, and compared on clinical outcomes. Multivariable logistic regression was performed to identify variables associated with survival to discharge, the primary outcome of interest.

RESULTS

The median BMI was 28.3 kg/m2 (interquartile range 24.8-32.6) with a range of 17.0-69.1 kg/m2. Obese patients achieved significantly lower percentages of predicted flow rates compared with BMI < 25 kg/m2 patients though did not differ in their lactate clearances. Patients with BMI ≥35 kg/m2 had similar complication rates to the other cohorts but were more likely to require continuous veno-venous haemodialysis (51% vs 25-40% in other cohorts, P = 0.002). Overall survival to discharge was 48% (n = 207/431) with no differences between the cohorts (P = 0.92). Patients with BMI ≥35 kg/m2 had considerably lower survival (10%) in extracorporeal membrane oxygenation cardiopulmonary resuscitation compared with the other groups (P = 0.17). On multivariable logistic regression, BMI was not significantly associated with failure to survive to discharge.

CONCLUSIONS

In conclusion, with the rising global prevalence of obesity, the results of our study suggest that clinicians need not treat obesity as a negative prognostic factor in cardiogenic shock requiring ECLS.

Central Versus Peripheral Arterial Cannulation for Veno-Arterial Extracorporeal Membrane Oxygenation in Post-Cardiotomy Patients

Different arterial cannulation strategies are feasible for veno-arterial extracorporeal membrane oxygenation (VA-ECMO) in postcardiotomy shock. We aimed to analyze potential benefits and safety of different arterial cannulation strategies. We identified 158 patients with postcardiotomy cardiogenic shock requiring VA-ECMO between 01/10 and 01/19. Eighty-eight patients were cannulated via axillary or femoral artery (group P), and 70 centrally via the ascending aorta directly or through an 8 mm vascular graft anastomosed to the ascending aorta (group C). Demographics and operative parameters were similar. Change of cannulation site for Harlequin's syndrome or hyperperfusion of an extremity occurred in 13 patients in group P but never in group C (p = 0.001). Surgical revision of cannulation site was also encountered more often in group P than C. The need for left ventricular (LV) unloading was similar between groups, whereas surgical venting was more often implemented in group C (11.4% vs. 2.3, p = 0.023). Stroke rates, renal failure, and peripheral ischemia were similar. Weaning rate from ECMO (52.9% vs. 52.3%, p = NS) was similar. The 30 day mortality was higher in group P (60% vs. 76.1%, p = 0.029). Central cannulation for VA-ECMO provides antegrade flow without Harlequin's syndrome, changes of arterial cannula site, and better 30 day survival. Complication rates regarding need for reexploration and transfusion requirements were similar.

The Psychological and HRQoL related Aftermaths of Extra Corporeal Membrane Oxygenation Treatment: A Cross-Sectional Study

OBJECTIVES

To assess symptoms of post-traumatic stress disorder, anxiety, depression and health related quality of life in a sample of adult patients treated with veno-arterial extracorporeal membrane oxygenation.

DESIGN AND SETTING

This is a cross-sectional study. The population were all patients discharged (2008-2018) from a thoracic surgical intensive ward at a tertiary university hospital in Norway. A sample of 20 patients was recruited.

MAIN OUTCOME MEASURES

Symptoms of post-traumatic stress disorder were assessed using Impact of Events Scale-Revised, while symptoms of depression and anxiety were assessed using Hospital Anxiety and Depression Scale. RAND 36-Item Short Form Health Survey was applied to measure health-related quality of life.

RESULTS

Symptoms of post-traumatic stress disorder were reported by 40% of the participants. Twenty percent reported symptoms of depression and anxiety. Compared to the general population, participants reported poorer health-related quality of life on all domains, and significantly worse on the domains physical function, general health and social function.

CONCLUSION

Patients in our study reported symptoms of post-traumatic stress disorder, anxiety, depression and impaired health-related quality of life following treatment with veno-arterial extra corporeal membrane oxygenation. Addressing possible emotional and psychological distress could represent a potential major improvement in health care provided to this group. Further research is needed to incorporate prophylactic methods, such as identifying vulnerable patients and implement corresponding interventions, into clinical practice.

Evaluation, Treatment, and Impact of Neurologic Injury in Adult Patients on Extracorporeal Membrane Oxygenation: a Review

Purpose

Extracorporeal membrane oxygen (ECMO) is increasingly used as an advanced form of life support for cardiac and respiratory failure. Unfortunately, in infrequent instances, circulatory and/or respiratory recovery is overshadowed by neurologic injury that can occur in patients who require ECMO. As such, knowledge of ECMO and its implications on diagnosis and treatment of neurologic injuries is indispensable for intensivists and neurospecialists.

Recent findings

The most common neurologic injuries include intracerebral hemorrhage, ischemic stroke, seizure, cerebral edema, intracranial hypertension, global cerebral hypoxia/anoxia, and brain death. These result from events prior to initiation of ECMO, failure of ECMO to provide adequate oxygen delivery, and/or complications that occur during ECMO. ECMO survivors also experience neurological and psychological sequelae similar to other survivors of critical illness.

Summary

Since many of the risk factors for neurologic injury cannot be easily mitigated, early diagnosis and intervention are crucial to limit morbidity and mortality from neurologic injury during ECMO.

Risk factors of acute renal injury and in-hospital mortality in adult patients with postcardiotomy cardiogenic shock requiring veno-arterial extracorporeal membrane oxygenation: utility of MELD-XI score

BACKGROUND

The suitability of model for end-stage liver disease excluding international normalized ratio (MELD-XI) score to predict the incidence of acute kidney injury (AKI) and in-hospital mortality in adult patients with postcardiotomy cardiogenic shock (PCS) requiring venoarterial extracorporeal membrane oxygenation (VA ECMO) remains uncertain. This study was performed to explore whether the MELD-XI score has the association with the incidence of AKI and in-hospital mortality in these patients.

METHODS

Adult patients with PCS requiring VA ECMO from January 2012 to December 2017 were enrolled and first classified into AKI group (n = 151) versus no-AKI group (n = 132), then classified into survival group (n = 143) versus no-survival group (n = 140). Multivariate logistic regressions were performed to identify factors independently associated with AKI and mortality. Baseline data were defined as the first measurement available.

RESULTS

Of 283 patients, the incidence of AKI was 53.36%. The in-hospital mortality rates were 63.58% and 33.33% in patients with and without AKI (p < 0.0001). Baseline MELD-XI score, baseline serum total bilirubin (T-Bil), baseline blood urea nitrogen (BUN), baseline left ventricular ejection fraction (LVEF), sequential organ failure assessment (SOFA) score, and lactate level at ECMO initiation were shown to be associated with the AKI. Vasoactive-inotropic score (VIS) and SOFA score at ECMO initiation as well as renal failure requiring renal replacement therapy (RRT) were shown to be associated with in-hospital mortality.

CONCLUSIONS

The baseline MELD-XI score, baseline BUN, baseline T-Bil, baseline LVEF, SOFA score and lactate at the initiation of ECMO were associated with AKI. AKI, SOFA score, and VIS at the initiation of ECMO were associated with in-hospital mortality, whereas MELD-XI score was not found to be associated with in-hospital mortality. A specific MELD-XI score as a threshold, as well as its sensitivity and specificity, needs to be confirmed in further studies.

Impact of Lactate Clearance on Early Outcomes in Pediatric ECMO Patients

Background and Objectives: Pediatric extracorporeal membrane oxygenation (ECMO) support is often the ultimate therapy for neonatal and pediatric patients with congenital heart defects after cardiac surgery. The impact of lactate clearance in pediatric patients during ECMO therapy on outcomes has been analyzed. Materials andMethods: We retrospectively analyzed data from 41 pediatric vaECMO patients between January 2006 and December 2016. Blood lactate and lactate clearance have been recorded prior to ECMO implantation and 3, 6, 9 and 12 h after ECMO start. Receiver operating characteristic (ROC) analysis was used to identify cut-off levels for lactate clearance. Results: Lactate levels prior to ECMO therapy (9.8 mmol/L vs. 13.5 mmol/L; p = 0.07) and peak lactate levels during ECMO support (10.4 mmol/L vs. 14.7 mmol/L; p = 0.07) were similar between survivors and nonsurvivors. Areas under the curve (AUC) of lactate clearance at 3, 9 h and 12 h after ECMO start were significantly predictive for mortality (p = 0.017, p = 0.049 and p = 0.006, respectively). Cut-off values of lactate clearance were 3.8%, 51% and 56%. Duration of ECMO support and respiratory ventilation was significantly longer in survivors than in nonsurvivors (p = 0.01 and p < 0.001, respectively). Conclusions: Dynamic recording of lactate clearance after ECMO start is a valuable tool to assess outcomes and effectiveness of ECMO application. Poor lactate clearance during ECMO therapy in pediatric patients is a significant marker for higher mortality.

Implementing Cardiac Surgical Unit-Advanced Life Support Through Simulation-Based Learning: A Quality Improvement Project

BACKGROUND

The European Association for Cardio Thoracic Surgery and the Society of Thoracic Surgeons endorse Cardiac Surgical Unit-Advanced Life Support, a protocol designed specifically for cardiothoracic surgical patients who suffer postoperative cardiac arrests. To enhance patient outcomes and to reduce death rates, cardiothoracic intensive care unit nurses must be able to perform the protocol with confidence, proficiency, and without delays. To this end, simulation-based learning (SBL) is a pedagogical method ideal for optimized learning.

OBJECTIVES

This quality improvement project was designed to implement a post-cardiac surgery resuscitation protocol in a nonacademic, community medical center to enhance nurse knowledge, confidence, and proficiency for optimal patient outcomes.

METHODS

The Cardiac Surgical Unit-Advanced Life Support is an evidence-based resuscitation protocol that was implemented using didactic, hands-on training, and SBL. It was evaluated using knowledge surveys, comparisons in nurse confidence and performance measures, and patient outcomes data.

RESULTS

Nurses' knowledge gains (ie, mean test scores) on our test were statistically significant between 3 time points (F2,60 = 81.204, P < .001). Knowledge significantly increased from pre-education to immediate post-education (P < .001), but declined from immediate post-education to 3-month post-education assessments (P < .001); however, the 3-month post knowledge mean was still higher than the pre-education knowledge mean (P < .001). Nurses were confident in their ability to apply the protocol, although results failed to show a correlation between confidence and performance ability. Statistical significance for delay in cardiopulmonary resuscitation was found between pre- and post-nursing education patient cardiac arrest events (P = .05).

CONCLUSIONS

Didactic and hands-on learning supported knowledge retention over time for cardiothoracic surgical intensive care unit nurses. Improving self-confidence and the application of an unfamiliar resuscitation protocol through SBL and any impact a training program has on patient outcomes will require ongoing practice and more evaluation.

[ECMO for post cardiotomy refractory cardiogenic shock: Experience of the cardiac surgery department of the Grenoble Alpes University Hospital]

OBJECTIVE

The objective of our study is to detail our experience relating to ECMO implantations for post-cardiotomy refractory shock, by analyzing the pre-ECMO factors (history, type of surgery, LVEF), factors relating to ECMO (implantation time, duration) and post-ECMO factors (weaning, complications) in order to highlight those possibly associated with high mortality.

METHODS

This is a univariate and multivariate retrospective study of ECMO data implemented between 2011 and 2019 at the Grenoble Alpes University Hospital Center following cardiac surgery. The time to implantation of ECMO was less than 3hours (intraoperative) between 3 and 24hours (early postoperative) and between 24 and 48hours after aortic unclamping (late postoperative). Preoperative or postoperative intra-aortic balloon counterpulsation (CPBIA) could be associated.

RESULTS

114 veino-arterial ECMOs were implanted for refractory cardiogenic shock after 5702 cardiac surgeries (1.9%) with a survival rate of 30.7%. The mean age of the patients was 68.6+- 10.5 years. The implantation of ECMO was performed intraoperatively in 71 patients (62.2%), early postoperatively in 22 patients (19.2%) and late postoperatively in 21 patients (18.4%). The duration of assistance was less than 48hours in 27 patients (23.6%), between 48hours and one week in 58 patients (50.9%) and more than one week in 29 patients (25.5%). Univariate analysis revealed a statistically significant association between mortality rate and male sex (P=0.002), association absent with other preoperative characteristics, delay in implantation of ECMO, installation of CPBIA, post-operative characteristics and resuscitation suites. Multivariate analysis of the entire study population demonstrated that the use of ECMO for cardio-respiratory arrest was the only independent risk factor for mortality (OR=7.57 [1.41-40, 62]). After multivariate reanalysis excluding patients with ECMO placement for cardio respiratory arrest, age, preoperative renal failure, type of procedure and EuroSCORE II were risk factors for mortality.

CONCLUSION

In this study, male gender, type of intervention, occurrence of cardiac arrest were significantly associated with the death rate. A study of greater power, multicentric, and with a larger sample, will have to be carried out to reach significance.

Gastrointestinal haemorrhage in extracorporeal membrane oxygenation: insights from the national inpatient sample

INTRODUCTION

Extracorporeal membrane oxygenation (ECMO) is associated with gastrointestinal haemorrhage (GIH), which may result from coagulopathy, systemic inflammation, reduced gastric perfusion, and arteriovenous malformation from non-pulsatile blood flow. Data are limited regarding the burden of this complication in the United States.

MATERIAL AND METHODS

We analysed the National Inpatient Sample (NIS) database for the years 2007 to 2011 to identify hospitalisations in which an ECMO procedure was performed. Hospitalizations complicated by GIH in this cohort were then identified by relevant codes.

RESULTS

Between 2007 and 2011, ECMO hospitalisations increased from 1869 to 3799 (p < 0.01). The proportion of hospitalisations complicated by GIH increased from 2.12% in 2007 to 7.46% in 2011 (p < 0.01). Gastrointestinal haemorrhage was more common in men (56.7%) and in Caucasians (57.4%). Common comorbidities in this population were renal failure (71%), anaemia (55%), and hypertension (26%). All-cause inpatient mortality showed a numerical but nonsignificant increase from 56.7% to 61.9% (p = 0.49). The average cost of care per hospitalisation with GIH associated with ECMO use increased from $132,420 in 2007 to $215,673 in 2011 (p < 0.01).

CONCLUSIONS

Gastrointestinal haemorrhage during ECMO hospitalisations occurred in small but significantly increasing proportions. The inpatient mortality rate and costs associated with GIH were substantial and increased significantly during the study period.

Enhancing Family-Centered Care in Cardiothoracic Surgery

The psychological impact of critical illness is far reaching, affecting patients and their loved ones. Family members face a multitude of stressors, ranging from concerns about death or permanent disability to stress over health care costs and lost wages. Patients are at risk for developing post-intensive care syndrome. Professional groups and patient safety organizations have crafted family-centered care (FCC) models that support hospitalized patients and their families. There is a paucity of data on use of FCC in cardiothoracic intensive care units. This article discusses FCC models and why they are beneficial to the needs of families of postoperative cardiothoracic surgery patients.

In-Hospital and Mid-Term Outcomes of ECMO Support During Coronary, Structural, or Combined Percutaneous Cardiac Intervention in High-Risk Patients - A Single-Center Experience

INTRODUCTION

Evidence regarding the impact of prophylactic implantation of Extracorporeal Membrane Oxygenation (ECMO) during coronary or structural procedures is limited. The purpose of this paper is to evaluate the in-hospital and medium term outcomes of ECMO support in complex percutaneous coronary or structural intervention.

METHODS

The present is an observational prospective study including consecutive patients who underwent to prophylactic ECMO implantation for percutaneous coronary intervention (PCI), structural or combined interventions between July 2018 and July 2020 in Maria Pia Hospital GVM Care & Research, Turin, Italy. Primary endpoints were in-hospital and medium term all-cause death. Secondary endpoints were vascular complication, bleeding and procedural success.

RESULTS

27 patients were included with a mean age of 80 ± 6 years, 10 (37%) being diabetics and 19 (70%) with severe left ventricle dysfunction. Mean Logistic Euroscore was 28.7 ± 18.7. Seven patients (26%) underwent complex coronary revascularization, 7 (26%) combined PCI + TAVI, 5 (19%) combined PCI + Mitraclip, 5 (19%) TAVI alone and finally 3 (11%) combined TAVI + Mitraclip. The procedural success was 96%, with only one in-hospital death due to major vascular complication at the ECMO vascular access. At a mean follow-up of 11 ± 6.8 months 4 deaths were recorded (3 from not cardiovascular causes).

CONCLUSIONS

Prophylactic use of ECMO may be beneficial for high risk patients undergoing complex combined coronary/structural percutaneous interventions with good in-hospital and mid-term outcomes in term of safety and procedural success.

Financial implications of using extracorporeal membrane oxygenation following heart transplantation

OBJECTIVES

Primary graft dysfunction after heart transplant is associated with high morbidity and mortality. Extracorporeal membrane oxygenation (ECMO) can be used to wean patients from cardiopulmonary bypass. This study retrospectively reviews a single-centre experience of post-transplant ECMO in regard to outcomes and associated costs.

METHODS

Between May 2006 and May 2019, a total of 267 adult heart transplants were performed. We compared donor and recipient variables, ECMO duration and the incidence of renal failure, bleeding, infection and cost analysis between ECMO and non-ECMO groups.

RESULTS

ECMO support was required postoperatively to manage primary graft dysfunction in 72 (27%) patients. The mean duration of ECMO support was 6 ± 3.2 days. Mean ischaemic times were similar between the groups. There was a significantly higher proportion of ventricular assist device explant to transplant in the ECMO group versus non-ECMO (38.2% vs 14.1%; P < 0.0001). ECMO patients had a longer duration of stay in the intensive care unit (P < 0.0001) and total hospital stay (P < 0.0001). Greater mortality was observed in the ECMO group (P < 0.0001). The median cost of providing ECMO was £18 000 [interquartile range (IQR): £12 750-£24 000] per patient with an additional median £35 225 (IQR: £21 487.25-£51 780.75) for ITU stay whilst on ECMO. The total median cost per patient inclusive of hospital stay, ECMO and dialysis costs was £65 737.50 (IQR: £52 566.50-£95 221.75) in the non-ECMO group compared to £145 415.71 (IQR: £102 523.21-£200 618.96) per patient in the ECMO group (P < 0.0001).

CONCLUSIONS

Patients with primary graft dysfunction following heart transplantation who require ECMO are frequently bridged to a recovery; however, the medium and longer-term survival for these patients is poorer than for patients who do not require ECMO.

Autologous mitochondrial transplantation for cardiogenic shock in pediatric patients following ischemia-reperfusion injury

OBJECTIVES

To report outcomes in a pilot study of autologous mitochondrial transplantation (MT) in pediatric patients requiring postcardiotomy extracorporeal membrane oxygenation (ECMO) for severe refractory cardiogenic shock after ischemia-reperfusion injury (IRI).

METHODS

A single-center retrospective study of patients requiring ECMO for postcardiotomy cardiogenic shock following IRI between May 2002 and December 2018 was performed. Postcardiotomy IRI was defined as coronary artery compromise followed by successful revascularization. Patients undergoing revascularization and subsequent MT were compared with those undergoing revascularization alone (Control).

RESULTS

Twenty-four patients were included (MT, n = 10; Control, n = 14). Markers of systemic inflammatory response and organ function measured 1 day before and 7 days following revascularization did not differ between groups. Successful separation from ECMO-defined as freedom from ECMO reinstitution within 1 week after initial separation-was possible for 8 patients in the MT group (80%) and 4 in the Control group (29%) (P = .02). Median circumferential strain immediately following IRI but before therapy was not significantly different between groups. Immediately following separation from ECMO, ventricular strain was significantly better in the MT group (-23.0%; range, -20.0% to -28.8%) compared with the Control group (-16.8%; range, -13.0% to -18.4%) (P = .03). Median time to functional recovery after revascularization was significantly shorter in the MT group (2 days vs 9 days; P = .02). Cardiovascular events were lower in the MT group (20% vs 79%; P < .01). Cox regression analysis showed higher composite estimated risk of cardiovascular events in the Control group (hazard ratio, 4.6; 95% confidence interval, 1.0 to 20.9; P = .04) CONCLUSIONS: In this pilot study, MT was associated with successful separation from ECMO and enhanced ventricular strain in patients requiring postcardiotomy ECMO for severe refractory cardiogenic shock after IRI.

The challenges of venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock

Postcardiotomy cardiogenic shock describes the syndrome of refractory cardiac performance following cardiac surgery. The use of venoarterial extracorporeal membrane oxygenation (VA-ECMO) for the management of postcardiotomy cardiogenic shock is controversial, and there are at least three scenarios where it may be necessary: first, pre-emptive postoperative VA-ECMO, where the decision for postoperative mechanical support is made prior to surgery, for example, in the context of poor pre-operative cardiac function; second, early yet unplanned post-cardiopulmonary bypass VA-ECMO following a long duration of cardiopulmonary bypass due to, for example, unexpected surgical complications; third, late rescue VA-ECMO following several attempts at weaning, either immediately following cardiopulmonary bypass or following transfer to the intensive care unit. The use of mechanical circulatory support for postcardiotomy cardiogenic shock is further complicated by the wide range of available devices, the availability of VA-ECMO in different centres, variations in experience and expertise as a function of local VA-ECMO workload, and regional variations in the diagnosis and management of postcardiotomy cardiogenic shock. Furthermore, survival appears to be low for such patients and it is not yet possible to predict who will survive. Many questions remain, however, such as those in relation to practices around patient selection, how best to study long-term outcomes, the ethics and efficacy of ECMO in such patients, and on all aspects of clinical decision-making. This review sets these clinical challenges in the context of the available evidence, including that from our centre.

Currently Available Options for Mechanical Circulatory Support for the Management of Cardiogenic Shock

Cardiogenic shock (CS) is a complex condition with a high risk for morbidity and mortality. Mechanical circulatory support (MCS) devices were developed to support patients with CS in cases refractory to treatment with vasoactive medications. Current devices include intra-aortic balloon pumps, intravascular microaxial pumps, percutaneous LVAD, percutaneous RVAD, and VA ECMO. Data from limited observational studies and clinical trials show a clear difference in the level of hemodynamic support offered by each device. However, at this point, there are insufficient clinical trial data to guide MCS selection and, until ongoing clinical trials are completed, use of the right device for the right patient depends largely on clinical judgment.

Optimization of extracorporeal membrane oxygenation therapy using near-infrared spectroscopy to assess changes in peripheral circulation: A pilot study

Near-infrared spectroscopy (NIRS) has been proposed as a noninvasive modality for detecting complications in patients undergoing extracorporeal membrane oxygenation (ECMO), and it can simultaneously reveal the global circulatory status of these patients. We optimized ECMO therapy on the basis of real-time peripheral NIRS probing. Three patients underwent venoarterial (VA) ECMO and one patient underwent venovenous (VV) ECMO. All patients received peripheral ECMO cannulation with routine distal perfusion catheter placement. We designed an experimental protocol to adjust ECMO blood flow over 1 hour. Hemodynamic responses were measured using NIRS devices attached to the calf at approximately 60% of the distance from the ankle to the knee. HbO₂ levels change substantially with adjustments in ECMO flow, and they are more sensitive than HHb levels and the tissue saturation index (TSI) are. NIRS for optimizing ECMO therapy may be reliable for monitoring global circulatory status.

Iatrogenic Extracorporeal Membrane Oxygenator Rupture: Successful Management of a Unique Crisis

We are presenting a case of successful resuscitation during accidental rupture of a venoarterial extracorporeal membrane oxygenator after surgical pulmonary embolectomy. This article reports a rare complication related to the mechanical circulatory support and its successful management.

Post-operative renal failure management in mechanical circulatory support patients

Acute kidney injury (AKI) occurs commonly in patients requiring mechanical circulatory support (MCS) after cardiothoracic surgery. The prognostic implications of AKI in this patient group relate closely to the pathophysiology and risk factors associated with the underlying disease; pre-operative, intra-operative, and post-operative variables; hemodynamic factors; and type of support device used. General approaches to AKI management, including prevention strategies, medical management, and hemodynamic support, are also applicable in patients requiring MCS. Approaches to renal replacement therapy vary depend on patient factors, device-specific factors, and local preferences and experience. In this invited narrative review, we discuss the pathophysiology, risk factors, and prognostic implications of AKI in post-operative adult patients following institution of MCS. Management strategies for AKI are presented with a focus on those supported with either extracorporeal membrane oxygenation or a ventricular assist device.

Weaning-Related Shock in Patients With ECMO: Incidence, Mortality, and Predisposing Factors

OBJECTIVE

Venoarterial extracorporeal membrane oxygenation (VA-ECMO) commonly is used to manage refractory cardiogenic shock after cardiac surgery, with 31% to 76% of patients successfully weaned off their ECMO. However, it is associated with high mortality rates, and 20% to 65% of weaned patients do not survive to hospital discharge. This study aimed to assess the incidence of ECMO weaning-related shock, the risk factors, and prognosis in the intensive care unit (ICU).

DESIGN

Retrospective observational cohort study.

SETTING

Surgical ICU of Cardiology Institute of Pitié-Salpêtrière University Hospital (Paris-France).

PARTICIPANTS

Patients who were assisted with a peripheral VA-ECMO from January 2015 to December 2017 were included. Patients with venovenous, central, or right ECMO were excluded.

MEASUREMENTS

The authors collected data on patients' characteristics, during and after surgery. The indications for VA-ECMO implantation were ventricular dysfunction, primary graft dysfunction, and refractory cardiac arrest. Weaning-related shock was defined as the need to introduce or increase the dose of catecholamine at ECMO explantation or in the following week.

RESULTS

After weaning off VA-ECMO, 56 of 146 patients (38.4%) presented weaning-related shock: 55% were septic shocks, 12.5 % were caused by right ventricle failure, and 7.1% by hemorrhage. ICU mortality was 42% versus 8% in patients who did not present shock. Multivariate analysis showed that patients with pulmonary hypertension and those with norepinephrine before weaning were more likely to develop shock.

CONCLUSION

ECMO weaning-related shock is frequent in patients with refractory cardiogenic shock after cardiac surgery. This is most commonly caused by sepsis and causes higher mortality rates, calling for further evaluation.

Thrombotic risk in central venoarterial extracorporeal membrane oxygenation post cardiac surgery

Introduction:

Post-cardiotomy cardiogenic shock is an accepted indication for venoarterial extracorporeal membrane oxygenation. The true incidence and risk factors for the development of thrombosis in this setting remain unclear.

Methods:

Patients supported with central venoarterial extracorporeal membrane oxygenation due to ventricular dysfunction precluding weaning from cardiopulmonary bypass were retrospectively identified. Electronic records from a single institution spanning a 4-year period from January 2015 to December 2018 were interrogated to assess the incidence of thrombosis. The relationship to exposures including intracardiac stasis and procoagulant usage was explored.

Results:

Twenty-four patients met the inclusion criteria and six suffered major intracardiac thrombosis. All cases of thrombosis occurred early, and none survived to hospital discharge. The lack of left ventricular ejection conferred a 46% risk of developing thrombosis compared to 0% if ejection was maintained (p = 0.0093). Aprotinin use was also associated with thrombus formation (p = 0.035). There were no significant differences between numbers of patients receiving other procoagulants when grouped by thrombosis versus no thrombosis.

Conclusion:

Stasis is the predominant risk factor for intracardiac thrombosis. This occurs rapidly and the outcome is poor. As a result, we suggest early left ventricular decompression. Conventional management of post-bypass coagulopathy seems safe if the aortic valve is opening.

Hematologic concerns in extracorporeal membrane oxygenation

This ISTH "State of the Art" review aims to critically evaluate the hematologic considerations and complications in extracorporeal membrane oxygenation (ECMO). ECMO is experiencing a rapid increase in clinical use, but many questions remain unanswered. The existing literature does not address or explicitly state many pertinent details that may influence hematologic complications and, ultimately, patient outcomes. This review aims to broadly introduce modern ECMO practices, circuit designs, circuit materials, hematologic complications, transfusion-related considerations, age- and size-related differences, and considerations for choosing outcome measures. Relevant studies from the 2019 ISTH Congress in Melbourne, which further advanced our understanding of these processes, will also be highlighted.

Awake veno-arterial extracorporeal membrane oxygenation in patients with perioperative period acute heart failure in cardiac surgery

Background

Extracorporeal membrane oxygenation (ECMO) is an effective extracorporeal life support technology that has been applied to treat cardiorespiratory failure patients. Some medical centers have started using ECMO on awake, non-intubated, spontaneously breathing patients, as this strategy offers several benefits over mechanical ventilation. However, most awake-ECMO methods focus on venovenous ECMO, and few cases of awake veno-arterial ECMO (V-A ECMO) have been reported, especially in perioperative acute heart failure. Therefore, our study aimed to examine awake—V-A ECMO cases that were not given continuous sedation or invasive mechanical ventilation (IMV) during perioperative heart failure.

Method

In total, 40 ECMO patients from December 2013 to November 2019 were divided into 2 groups (the awake-ECMO group and the asleep-ECMO group) according to the ventilation use. The demographics, patient outcomes, and ECMO parameters were collected and retrospectively analyzed.

Results

We identified 12 cases of awake ECMO without continuous ventilation, and 28 cases of simultaneous IMV and ECMO (asleep ECMO). Awake-ECMO patients showed fewer complications and better outcomes compared to ventilation patients. All patients in the awake group were successfully weaned off ECMO, while only 5 (18%) patients were weaned off ECMO in the asleep group. Furthermore, 9 (75%) patients survived until discharge in the awake group vs. 3 (11%) in the asleep group; 3 patients died of septic shock after weaning in the awake group, while 25 patients died of septic shock, hemodynamic disorder, bleeding, cerebral hemorrhage, etc., in the asleep group. These complications, including bleeding, pneumonia, hemolysis, and abdominal distension, etc., occurred less frequently in the asleep group compared to the awake group (P<0.05).

Conclusions

Awake V-A ECMO is an effective, feasible, and safe strategy in patients with perioperatively acute heart failure and can be applied as a bridge to cardiac function recovery or transplantation.

Predictors of complications associated with extracorporeal membrane oxygenation

OBJECTIVES

to identify in the literature, the predictors of ECMO complications in adult patients.

METHODS

integrative review of literature, including articles in Portuguese, English and Spanish published from 2014 to 2018 in five databases. Included articles which analyzed the predictive factors of ECMO complications in adult patients using multivariate analysis.

RESULTS

a total of 1629 articles were identified, of which 19 were included. Nineteen predictors were identified for neurological complications (e.g., post-ECMO hypoglycemia), seven for bleeding complications (e.g., fungal pneumonia), four for infections complications (e.g., preoperative creatinine level), three for kidney complications (e.g., the length of ICU stay> 20 days) and a combination of factors for mechanical complications (e.g., median flow).

CONCLUSIONS

different predictors were identified to ECMO complications. The knowledge of these predictors enables the individualized targeting of preventive interventions by multidisciplinary team for modifiable factors, as well as intensification of monitoring for early recognition of non-modifiable factors.

Central vs peripheral venoarterial ECMO in postcardiotomy cardiogenic shock

OBJECTIVES

Central or peripheral venoarterial extracorporeal membrane oxygenation (va ECMO) is widely used in postcardiotomy cardiogenic shock (PCS). Available data suggest controversial results for both types. Our aim was to investigate PCS patients treated with either peripheral (pECMO) or central ECMO (cECMO) concerning their outcome.

METHODS

Between April 2006 and October 2016, 156 consecutive patients with va ECMO therapy due to PCS were identified and included in this retrospective analysis. Patients were divided into cECMO and pECMO groups. Statistical analysis of risk factors concerning 30-day mortality of the mentioned patient cohort was performed using IBM SPSS Statistics.

RESULTS

Fifty-six patients received cECMO and 100 patients were treated with pECMO due to PCS. In the group of cECMO peripheral vascular disease was significantly more present (cECMO 19 [34%] vs pECMO 14 [14%]; P < .01). On-site ECMO complications occurred significantly more frequent in patients treated with cECMO (cECMO 44 [79%] vs pECMO 54 [54%] g/dL; P < 0.01). More often cECMO patients required a second look operation due to mediastinal bleeding (cECMO 52 [93%] vs pECMO 61 [61%] g/dL; P < .01). Thirty-day mortality was comparable with nearly 70% in both cohorts (cECMO 39 [70%] vs pECMO 69 [69%]; P = .93).

CONCLUSION

Patients supported by cECMO or pECMO due to refractory PCS did not show significant differences in 30-day mortality, despite a lower incidence of on-site ECMO complications and re-exploration in pECMO patients. PCS itself is associated with high mortality and peripheral cannulation might help to save resources compared with central cannulation.

Myocardial perfusion and cardiac dimensions during extracorporeal membrane oxygenation-supported circulation in a porcine model of critical post-cardiotomy failure

Introduction:

Venoarterial extracorporeal membrane oxygenation is widely used as mechanical circulatory support for severe heart failure. A major concern with this treatment modality is left ventricular distension due to inability to overcome the afterload created by the extracorporeal membrane oxygenation circuit. The present porcine study evaluates coronary circulation, myocardial perfusion and ventricular distension during venoarterial extracorporeal membrane oxygenation.

Methods:

Ten anesthetized open-chest pigs were cannulated and put on cardiopulmonary bypass. Heart failure was achieved by 90 minutes of aortic cross-clamping with insufficient cardioplegic protection. After declamping, the animals were supported by venoarterial extracorporeal membrane oxygenation for 3 hours. Continuous haemodynamic measurements were performed at baseline, during cardiopulmonary bypass/aortic cross-clamping and during venoarterial extracorporeal membrane oxygenation. Fluorescent microsphere injections at baseline and after 1, 2 and 3 hours on venoarterial extracorporeal membrane oxygenation evaluated myocardial perfusion. Left ventricular function and distension were assessed by epicardial echocardiography.

Results:

The myocardial injury caused by 90 minutes of ischaemia resulted in a poorly contracting myocardium, necessitating venoarterial extracorporeal membrane oxygenation in all animals. The circulatory support maintained the mean arterial blood pressure within a satisfactory range. A hyperaemic left anterior descending coronary artery flow while on extracorporeal membrane oxygenation was observed compared to baseline. Myocardial tissue perfusion measured by microspheres was low, especially in the subendocardium. Echocardiography revealed myocardial tissue oedema, a virtually empty left ventricle, and a left ventricular output that remained negligible throughout the extracorporeal membrane oxygenation run.

Conclusion:

Coronary artery blood flow is maintained during venoarterial extracorporeal membrane oxygenation after cardiopulmonary bypass and cardioplegic arrest despite severely affected performance of the left ventricle. Myocardial perfusion decreases, however, presumably due to rapid development of myocardial tissue oedema.

Model for end-stage liver disease scores in veno-arterial extracorporeal membrane oxygenation

INTRODUCTION

Veno-arterial extracorporeal membrane oxygenation is a valuable therapeutic approach in patients with severe heart failure due to different etiologies. Current prognosis with veno-arterial extracorporeal membrane oxygenation is unsatisfactory, and the risk stratification is still challenging. Therefore, we aimed to evaluate the predictive value of different baseline model for end-stage liver disease scores for survival in patients with veno-arterial extracorporeal membrane oxygenation.

METHODS

We conducted an observational, retrospective study of consecutive veno-arterial extracorporeal membrane oxygenation-treated patients between January 2012 and August 2018. The four types of model for end-stage liver disease scores-model for end-stage liver disease, international normalized ratio-excluded model for end-stage liver disease, modified model for end-stage liver disease, and model for end-stage liver disease with sodium-were calculated preoperatively. Veno-arterial extracorporeal membrane oxygenation was used based on the four clinical indications: primer graft failure after heart transplantation, weaning failure from cardiopulmonary bypass, acute myocardial infarction with refractory cardiogenic shock, and bridge to transplantation or bridge to candidacy. The primary endpoint of the study was overall mortality. The secondary endpoint was in-hospital mortality. We performed univariable and multivariable Cox regression analyses.

RESULTS

Data from 135 patients were analyzed. The median follow-up was 952 days (interquartile range = 417-1555 days). In-hospital mortality was 62.2%, and overall mortality was 71.1%. The multivariable Cox regression analysis is adjusted for indication, and the survival after veno-arterial extracorporeal membrane oxygenation score showed that the following scores were associated with overall mortality: model for end-stage liver disease (hazard ratio = 1.04; 95% confidence interval = 1.01-1.07; p = 0.016), modified model for end-stage liver disease (hazard ratio = 1.04; 95% confidence interval = 1.01-1.06; p = 0.006), and model for end-stage liver disease with sodium (hazard ratio = 1.05; 95% confidence interval = 1.02-1.08; p = 0.001).

CONCLUSION

Model for end-stage liver disease, modified model for end-stage liver disease, and model for end-stage liver disease with sodium scores could be useful in the risk stratification of veno-arterial extracorporeal membrane oxygenation treatment in varying clinical indications.

Venoarterial extracorporeal membrane oxygenation for postcardiotomy cardiogenic shock-A six-year service evaluation

Only a small number of English hospitals provide postcardiotomy venoarterial extracorporeal membrane oxygenation (VA-ECMO) and there are doubts about its efficacy and safety. The aim of this service evaluation was to determine local survival rates and report on patient demographics. This was a retrospective service evaluation of prospectively recorded routine clinical data from a tertiary cardiothoracic center in the United Kingdom offering services including cardiac and thoracic surgery, heart and lung transplantation, venovenous extracorporeal membrane oxygenation (VV-ECMO) for respiratory failure, and all types of mechanical circulatory support. In six years, 39 patients were supported with VA-ECMO for refractory postcardiotomy cardiogenic shock (PCCS). We analyzed survival data and looked for associations between survival rates and patient characteristics. The intervention was venoarterial-ECMO in patients with PCCS either following weaning from cardiopulmonary bypass or following a trial of inotropes and intra-aortic balloon counterpulsation on the intensive care unit. 30-day, hospital discharge, 1-year and 2-year survivals were 51.3%, 41%, 37.5%, and 38.5%, respectively. The median (IQR [range]) duration of support was 6 (4-9 [1-35]) days. Nonsurvival was associated with advanced age, shorter intensive care length of stay, and the requirement for postoperative hemofiltration. Reasonable survival rates can be achieved in selected patients who may have been expected to have a worse mortality without VA-ECMO. We suggest postoperative VA-ECMO should be available to all patients undergoing cardiac surgery be it in their own center or through an established pathway to a specialist center.