Neonatal carotid repair at ECMO decannulation: patency rates and early neurologic outcomes

Veno-arterial extracorporeal membrane oxygenation for respiratory and cardiac support in neonates: a single center experience

Objective

Extracorporeal membrane oxygenation (ECMO) is an advanced life support that has been utilized in the neonate for refractory respiratory and circulatory failure. Striving for the best outcomes and understanding optimal surgical techniques continue to be at the forefront of discussion and research. This study presents a single-center experience of cervically cannulated neonatal patients on V-A ECMO, a description of our cannulation/decannulation techniques and our patient outcomes.

Methods

Single center retrospective review of neonates who received neck V-A ECMO support from January 2012 to December 2022. The data and outcomes of the patients were retrospectively analyzed.

Results

A total of 78 neonates received V-A ECMO support. There were 66 patients that received ECMO for respiratory support, the other 12 patients that received ECMO for cardiac support. The median duration of ECMO support was 109 (32-293) hours for all patients. During ECMO support, 20 patients died and 5 patients discontinued treatment due to poor outcome or the cost. A total of 53 (68%) patients were successfully weaned from ECMO, but 3 of them died in the subsequent treatment. Overall 50 (64%) patients survived to hospital discharge. In this study, 48 patients were cannulated using the vessel sparing technique, the other 30 patients were cannulated using the ligation technique. We found no significant difference in the rates of normal cranial MRI at discharge between survivors with and without common carotid artery ligation.

Conclusion

We achieved satisfactory outcomes of neonatal ECMO in 11-year experience. This study found no significant difference in early neuroimaging between survivors with and without common carotid artery ligation. The long-term neurological function of ECMO survivors warranted further follow-up and study.

Carotid Artery Patency and Neurodevelopmental Outcomes After Decannulation in Pediatric Extracorporeal Life Support

INTRODUCTION

Decannulation from veno-arterial extracorporeal life support may involve ligation or repair of the carotid artery; however, differences in outcomes are not clear. This study aimed to describe short- and long-term artery patency and neurodevelopmental outcomes in neonatal and pediatric patients who underwent carotid artery repair (CAR) versus ligation at decannulation.

METHODS

Patients supported on veno-arterial extracorporeal life support during the first 15 mo of life from 2010 to 2020 at a large, tertiary care children's hospital were included. Decannulation strategy, postdecannulation imaging, and follow-up visits were reviewed.

RESULTS

74 patients were identified with median age at cannulation 2 d (interquartile range [IQR] = 1-21 d) and median weight 3.7 kg (interquartile range= 3.2-4.4 kg). Indications included congenital cardiac conditions (27%), congenital diaphragmatic hernia (19%), pulmonary hypertension (19%), meconium aspiration (16%), and pneumonia/sepsis (14%). Forty-two patients (57%) underwent CAR. Patients on extracorporeal life support >5 d were 95% less likely to undergo CAR (P < 0.001). Of CAR patients, 18 (43%) had doppler ultrasound performed within the 2-y follow-up period. Ten of 18 patients (55.6%) had >50% stenosis (3) or complete occlusion (7). Only 36% (27/74) had formal neurodevelopmental follow-up within 6 mo and 41% (30/74) within 2 y; however, no significant differences in function were seen between groups.

CONCLUSIONS

Neonates and young toddler patients undergoing CAR following extracorporeal life support decannulation are at risk for partial or complete artery occlusion. In our study population, repair and ligation at decannulation appear to have similar neurodevelopmental outcomes; however, follow-up to assess function is not standardized. Longer term follow-up and risk stratification are needed to guide decannulation strategy.

Vascular Reconstruction After Cannulation for Support With Extracorporeal Membrane Oxygenation: Literature Review of Data in the Pediatric Population

OBJECTIVES

Extracorporeal membrane oxygenation (ECMO) is an invaluable life-support resource in the treatment of critically ill children. Traditionally, neck vascular cannulation requires ligation of the carotid artery and jugular vein. In this literature review, we identify rates of postoperative vessel patency, complications, and neurologic outcomes after vascular reconstruction following decannulation.

DATA SOURCES

Embase, PubMed, and Cochrane Review.

STUDY SELECTION

No publication date limits. Inclusion criteria comprised of studies addressing repair of the carotid artery and jugular vein after ECMO decannulation and outcomes from this procedure.

DATA EXTRACTION

Authors identified publications on vascular reconstruction after ECMO decannulation, including possible technical considerations, complications, and outcomes.

DATA SYNTHESIS

We identified 18 articles: 13 studies were limited to the neonatal population. The largest series included 51 patients after vascular reconstruction. The rate of postoperative arterial occlusion ranged from 11.8% to 17.8%, and overall patency rate postoperatively was 78.6%. No major thromboembolic events were reported. One study demonstrated an increase in neuroimaging abnormalities for patients undergoing ligation compared with vascular reconstruction. No studies demonstrated differences in functional neurodevelopmental testing.

CONCLUSIONS

Vascular reconstruction after ECMO decannulation has been reported since 1990. Although reconstruction does not appear to carry significant short-term morbidity, there are no large prospective studies or randomized controlled trials demonstrating its efficacy in improving neurologic outcomes in ECMO patients. There is also a paucity of data regarding outcomes in older children or long-term ramifications of vascular reconstruction.

Surgical experience in repairing the right common carotid artery and the right internal jugular vein after ECMO in neonates: early clinical results

BACKGROUND

The purpose of this study was to summarize the early clinical results and surgical experience of repairing the right common carotid artery and the right internal jugular vein after ECMO treatment in neonates.

METHODS

We retrospectively collected the clinical data of 16 neonates with circulatory and respiratory failure who were treated with ECMO via the right common carotid artery and the right internal jugular vein in our hospital from June 2021 to December 2022. The effects of repairing the common carotid artery and internal jugular vein were evaluated.

RESULTS

All 16 patients successfully underwent right cervical vascular cannulation, and the ECMO cycle was successfully established. Twelve patients were successfully removed from ECMO. The right common carotid artery and the right internal jugular vein were successfully repaired in these 12 patients. There was unobstructed arterial blood flow in 9 patients, mild stenosis in 1 patient, moderate stenosis in 1 patient and obstruction in 1 patient. There was unobstructed venous blood flow in 10 patients, mild stenosis in 1 patient, and moderate stenosis in 1 patient. No thrombosis was found in the right internal jugular vein. Thrombosis was found in the right common carotid artery of one patient.

CONCLUSION

Repairing the right common carotid artery and the right internal jugular vein after ECMO treatment in neonates was feasible, and careful surgical anastomosis techniques and standardized postoperative anticoagulation management can ensure early vascular patency. However, long-term vascular patency is still being assessed in follow-up.

A Systematic Review of Clinical Outcomes After Carotid Artery Ligation Versus Carotid Artery Reconstruction Following Venoarterial Extracorporeal Membrane Oxygenation in Infants and Children

INTRODUCTION

In pediatric and neonatal populations, the carotid artery is commonly cannulated for venoarterial (VA) extracorporeal membrane oxygenation (ECMO). The decision to ligate (carotid artery ligation [CAL]) versus reconstruct (carotid artery reconstruction [CAR]) the artery at decannulation remains controversial as long-term neurologic outcomes remain unknown. The objective of this study was to summarize current literature on clinical outcomes following CAL and CAR after Venoarterial Extracorporeal Membrane Oxygenation (VA-ECMO).

METHODS

PubMed (MEDLINE), Embase, Web of Science, and Cochrane databases were searched using keywords from January 1950 to October 2020. Studies examining clinical outcomes following CAL and CAR for VA-ECMO in patients <18 y of age were included. Prospective and retrospective cohort studies, case series, case-control studies, and case reports were included. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were performed independently by two reviewers. Assessment of risk of bias was performed.

RESULTS

Eighty studies were included and classified into four categories: noncomparative clinical outcomes after CAL (n = 23, 28.8%), noncomparative clinical outcomes after CAR (n = 12, 15.0%), comparative clinical outcomes after CAL and/or CAR (n = 28, 35.0%), and case reports of clinical outcomes after CAL and/or CAR (n = 17, 21.3%). Follow-up ranged from 0 to 11 y. CAR patency rates ranged from 44 to 100%. There was no substantial evidence supporting an association between CAL versus CAR and short-term neurologic outcomes.

CONCLUSIONS

Studies evaluating outcomes after CAL versus CAR for VA-ECMO are heterogeneous with limited generalizability. Further studies are needed to evaluate long-term consequences of CAL versus CAR, especially as the first survivors of pediatric/neonatal ECMO approach an age of increased risk of carotid stenosis and stroke.

Neonatal Carotid Artery and Internal Jugular Vein Management Practices at Extracorporeal Membrane Oxygenation Decannulation: No Standard Approach

BACKGROUND

There are currently no commonly accepted standardized guidelines for management of cervical vessels at neonatal extracorporeal membrane oxygenation (ECMO) decannulation. This study investigates neonatal ECMO decannulation practices regarding management of the carotid artery and internal jugular vein, use of post-repair anticoagulation, and follow-up imaging.

METHODS

A survey was distributed to the 37 institutions in the Children's Hospitals Neonatal Consortium. Respondents reported their standard approach to carotid artery and internal jugular vein management (ligation or repair) at ECMO decannulation by their pediatric surgery and cardiothoracic (CT) surgery teams as well as post-repair anticoagulation practices and follow-up imaging protocols.

RESULTS

The response rate was 95%. Pediatric surgeons performed most neonatal respiratory ECMO cannulations (88%) and decannulations (85%), while all neonatal cardiac ECMO cannulations and decannulations were performed by CT surgeons. Pediatric surgeons overwhelmingly ligate both vessels (90%) while CT surgeons typically repair both vessels at decannulation (83%). Of the responding centers that repair, 28% (7) have a standard anticoagulation protocol after neck vessel repair. While 52% (13) of centers routinely image cervical vessel patency at least once post repair, most do not subsequently repeat neck vessel imaging.

CONCLUSIONS

Significant practice differences exist between pediatric and CT surgeons regarding the approach to cervical vessels at neonatal ECMO decannulation. For those centers that do repair the vessels there is little uniformity in post-repair anticoagulation or imaging protocols. There is a need to develop standardized cervical vessel management guidelines for neonatal ECMO patients and to study their impact on both short- and long-term outcomes.

LEVEL OF EVIDENCE

IV.

Pediatric ECLS Neurologic Management and Outcomes

Neurologic complications associated with extracorporeal life support (ECLS), including seizures, ischemia/infarction, and intracranial hemorrhage significantly increase morbidity and mortality in pediatric and neonatal patients. Prompt recognition of adverse neurologic events may provide a window to intervene with neuroprotective measures. Many neuromonitoring modalities are available with varying benefits and limitations. Several pre-ECLS and ECLS-related factors have been associated with an increased risk for neurologic complications. These may be patient- or circuit-related and include modifiable and non-modifiable factors. ECLS survivors are at risk for long-term neurological sequelae affecting neurodevelopmental outcomes. Possible long-term outcomes range from normal development to severe impairment. Patients should undergo a neurological evaluation prior to discharge, and neurodevelopmental assessments should be included in each patient's structured, multidisciplinary follow-up. Safe pediatric and neonatal ECLS management requires a thorough understanding of neurological complications, neuromonitoring techniques and limitations, considerations to minimize risk, and an awareness of possible long-term ramifications. With a focus on ECLS for respiratory failure, this manuscript provides a review of these topics and summarizes best practice guidelines from international organizations and expert consensus.

Cannulation approach and mortality in neonatal ECMO

OBJECTIVE

Identify associations between cannulation approach and mortality in neonates who received ECMO support for respiratory failure.

STUDY DESIGN

A retrospective analysis of neonates receiving ECMO for respiratory indications at a single quaternary-referral NICU. Associations between cannulation approach and mortality were assessed after adjustment for Neo-RESCUERS score. Cox Proportional Hazards (CPH) model was used to estimate hazard ratios (HR) and 95% confidence intervals (CI) for each variable and outcome.

RESULTS

Among 244 neonates, overall survival was 88%, with 71% undergoing VV cannulation. After adjusting for Neo-RESCUERS score, VA cannulation was associated with higher mortality during ECMO when compared with VV cannulation (HR 4.189, 95% CI 1.480-11.851, P = 0.0069). Disease-specific comparisons revealed no statistical difference in Neo-RESCUERS score between VA and VV cohorts; however, VA cannulation was associated with higher ECMO mortality for neonates with congenital diaphragmatic hernia (50% vs. 5.5%, Χ² = 8.5965, P = 0.0034) and PPHN (20% vs. 1.8%, Χ² = 9.1047, P = 0.0025) when compared with VV cannulation.

CONCLUSION

VA cannulation was associated with increased mortality in neonates while on ECMO for respiratory failure, which was independent of illness severity.

Updates in Neonatal Extracorporeal Membrane Oxygenation and the Artificial Placenta

Extracorporeal life support, initially performed in neonates, is now commonly used for both pediatric and adult patients requiring pulmonary and/or cardiac support. Data suggests the clinical feasibility of Extracorporeal Membrane Oxygenation for premature infants (29-33 weeks estimated gestational age [EGA]). For extremely premature infants less than 28 weeks EGA, an artificial placenta has been developed to recreate the fetal environment. This approach is investigational but clinical translation is promising. In this article, we discuss the current state and advances in neonatal and "preemie Extracorporeal Membrane Oxygenation" and the development of an artificial placenta and its potential use in extremely premature infants.

Cannulation and decannulation techniques for neonatal ECMO

In neonates with cardiac and/or respiratory failure, extracorporeal membrane oxygenation (ECMO) continues to be an important method of respiratory and/or cardiovascular support where conventional treatments are failing. ECMO cannulation involves a complex decision-making process to choose the proper ECMO modality and cannulation strategy to match each patient's needs, unique anatomy, and potential complication profile. Initially, all ECMO support involved cannulating both the carotid artery and the internal jugular vein (IJV), known as veno-arterial (VA-ECMO) for cardiac and/or respiratory support. Rarely was cannulation through the chest used. The development of dual-lumen cannulae in the early to mid 1990s addressed the concerns about carotid artery ligation and its impact on neurological outcomes, and allowed single vascular access for veno-venous respiratory support (VV-ECMO). We present a review of cannulation and decannulation techniques for both VA and VV-ECMO in neonates.

Extracorporeal Membrane Oxygenation in Congenital Heart Disease

Mechanical circulatory support (MCS) is a key therapy in the management of patients with severe cardiac disease or respiratory failure. There are two major forms of MCS commonly employed in the pediatric population—extracorporeal membrane oxygenation (ECMO) and ventricular assist device (VAD). These modalities have overlapping but distinct roles in the management of pediatric patients with severe cardiopulmonary compromise. The use of ECMO to provide circulatory support arose from the development of the first membrane oxygenator by George Clowes in 1957, and subsequent incorporation into pediatric cardiopulmonary bypass (CPB) by Dorson and colleagues. The first successful application of ECMO in children with congenital heart disease undergoing cardiac surgery was reported by Baffes et al. in 1970. For the ensuing nearly two decades, ECMO was performed sparingly and only in specialized centers with varying degrees of success. The formation of the Extracorporeal Life Support Organization (ELSO) in 1989 allowed for the collation of ECMO-related data across multiple centers for the first time. This facilitated development of consensus guidelines for the use of ECMO in various populations. Coupled with improving ECMO technology, these advances resulted in significant improvements in ECMO utilization, morbidity, and mortality. This article will review the use of ECMO in children with congenital heart disease.

ECMO in neonates: The association between cerebral hemodynamics with neurological function

Extracorporeal membrane oxygenation (ECMO) is a superior life support technology, commonly employed in critical patients with severe respiratory or hemodynamic failure to provide effective respiratory and circulatory support, which is especially recommended for the treatment of critical neonates. However, the vascular management of neonates with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) is still under controversy. Reconstruction or ligation for the right common carotid artery (RCCA) after ECMO is inconclusive. This review summarized the existed studies on hemodynamics and neurological function after vascular ligation or reconstruction hoping to provide better strategies for vessel management in newborns after ECMO. After reconstruction, the right cerebral blood flow can increase immediately, and the normal blood supply can be restored rapidly. But the reconstructed vessel may be occluded and stenotic in long-term follow-ups. Ligation may cause lateralization damage, but there could be no significant effect owing to the establishment of collateral circulation. The completion of the circle of Willis, the congenital anomalies of cerebral or cervical vasculature, the duration of ECMO, and the vascular condition at the site of arterial catheterization should be assessed carefully before making the decision. It is also necessary to follow up on the reconstructed vessel sustainability, and the association between cerebral hemodynamics and neurological function requires further large-scale multi-center studies.

Neonatal respiratory and cardiac ECMO in Europe

Neonatal extracorporeal membrane oxygenation (ECMO) is a life-saving procedure for critically ill neonates suffering from a potentially reversible disease, causing severe cardiac and/or respiratory failure and refractory to maximal conventional management. Since the 1970s, technology, management, and clinical applications of neonatal ECMO have changed. Pulmonary diseases still represent the principal neonatal diagnosis, with an overall 74% survival rate, and up to one-third of cases are due to congenital diaphragmatic hernia. The overall survival rate in cardiac ECMO is lower, with congenital heart defect representing the main indication. This review provides an overview of the available evidence in the field of neonatal ECMO. We will address the changing epidemiology, basic principles, technologic advances in circuitry, and monitoring, and deliver a current multidisciplinary management framework, focusing on ECMO applications, complications, and long-term morbidities. Lastly, areas for further research will be highlighted.Conclusions: ECMO is a life support with a potential impact on long-term patients' outcomes. In the next years, advances in knowledge, technology, and expertise may push neonatal ECMO boundaries towards more premature and increasingly complex infants, with the final aim to reduce the burden of ECMO-related complications and improve overall patients' outcomes. What is Known: • ECMO is a life-saving option in newborns with refractory respiratory and/or cardiac failure. • The multidisciplinary ECMO management is challenging and may expose neonates to complications with an impact on long-term outcomes. What is New: • Advances in technology and biomaterials will improve neonatal ECMO management and, eventually, the long-term outcome of these complex patients. • Experimental models of artificial placenta and womb technology are under investigation and may provide clinical translation and future research opportunities.

Carotid Artery Dissection and Hemorrhagic Stroke in the Setting of Multisystem Inflammatory Syndrome in Children

An alarming and distressing delayed inflammatory response to Coronavirus Disease 2019 (COVID-19) has emerged in children and adolescents, a population previously thought to have been largely spared by this global pandemic. In April 2020, clinicians in the United Kingdom identified eight cases of previously healthy children testing positive for current or recent infection with Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) presenting with Kawasaki disease-like features. From April 16 to May 4, 2020, New York City reported that 15 patients aged 2-15 years were hospitalized with a similar multisystem inflammatory syndrome, many requiring intensive care unit (ICU) admission. This syndrome is referred to either as pediatric inflammatory multisystem syndrome, or multisystem inflammatory syndrome in children (MIS-C). We present the case of an eight-year-old with MIS-C who developed carotid artery dissection following venoarterial extracorporeal membrane oxygenation (VA-ECMO) cannulation, followed by a subsequent hemorrhagic stroke in the basal ganglia.

Practice patterns in imaging guidance for ECMO cannulation: A survey of the American Pediatric Surgical Association

BACKGROUND

Surgeon-specific variations in pediatric extracorporeal membrane oxygenation (ECMO) cannulation technique are not well characterized. Advances in technology have led to changing techniques with no formal consensus statement for reference.

METHODS

A survey was e-mailed to 1301 members of the American Pediatric Surgical Association (APSA). Categorical data was compared with Chi-squared and Kendall's tau-β tests, and multiple column comparisons were performed with the Bonferroni correction.

RESULTS

Response rate was 19%, with 248 pediatric general surgeons responding to the survey. 89.4% of respondents stated that cannulation was typically performed in the ICU. Venoarterial (VA) ECMO cannulation was more often performed open (88.6%) than venovenous (VV) ECMO (42.2%). Surgeons cannulate for VA ECMO and VV ECMO without imaging guidance 44% and 21.5% of the time, respectively. There was no difference in estimated rate of cannula repositioning by cannulation strategy. For venous and arterial cannulation in VA ECMO, surgeons were more likely to use the femoral as opposed to the neck when children were older than 13 years and weighed more than 35 kg regardless of the presence or absence of preexisting femoral arterial or venous access.

CONCLUSION

Practice patterns for ECMO cannulation are variable among pediatric surgeons. Standardization could reduce the occurrence of unsafe practices and potentially decrease complications and improve patient outcomes.

LEVEL OF EVIDENCE

Level IV.

Comparing Percutaneous to Open Access for Extracorporeal Membrane Oxygenation in Pediatric Respiratory Failure

OBJECTIVES

Evaluate trends in method of access (percutaneous cannulation vs open cannulation) for pediatric extracorporeal membrane oxygenation and determine the effects of cannulation method on morbidity and mortality.

DESIGN

Retrospective cohort study.

SETTING AND SUBJECTS

The Extracorporeal Life Support Organization's registry was queried for pediatric patients on extracorporeal membrane oxygenation for respiratory failure from 2007 to 2015.

INVERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Of 3,501 patients identified, 77.2% underwent open cannulation, with the frequency of open cannulation decreasing over the study period from approximately 80% to 70% (p < 0.001). Percutaneous cannulation patients were more commonly male (24.2% vs 21.5%; p = 0.01), older (average 7.6 vs 4.5 yr; p < 0.001), and heavier (average 33.0 vs 20.2 kg; p < 0.001). Subset analysis of patients on venovenous extracorporeal membrane oxygenation revealed higher rates of mechanical complications due to blood clots (28.9% vs 22.6%; p = 0.003) or cannula problems (18.9% vs 12.7%; p < 0.001), cannula site bleeding (25.3% vs 20.2%; p = 0.01) and increased rates of cannula site repair in the open cannulation cohort. Limb related complications were not significantly different on subset analysis for venovenous extracorporeal membrane oxygenation patients stratified by access site. Logistic regression analysis revealed that method of access was not associated with a difference in mortality.

CONCLUSIONS

The proportion of pediatric patients undergoing percutaneous extracorporeal membrane oxygenation cannulation is increasing. Mechanical and physiologic complications occur with both methods of cannulation, but percutaneous cannulation appears safe in this cohort. Further analysis is needed to evaluate long-term outcomes with this technique.

Is there a best approach for extracorporeal life support cannulation: a review of the extracorporeal life support organization

BACKGROUND

Neurologic complications are common, and amongst the most devastating complications in pediatric patients undergoing extracorporeal life support (ECLS). Carotid artery cannulation (CAN) has been associated with an increase in these complications, thereby shaping practices to avoid this approach in most pediatric patients in which other cannulation approaches are viable.

METHODS

A retrospective review of children (0-18years) in the ELSO database was undertaken from 1989 through 2013. Multivariate logistic regression analysis of rates of stroke and other neurologic complications based on cannulation technique was undertaken, adjusting for patient factors including age, underlying disease process, and severity of illness.

RESULTS

A total of 30,282 ECLS runs were found in the database. CAN was associated with higher rates of stroke (5.15% vs 3.74%) and overall neurologic complications. However, when correcting for patient factors, including age, underlying disease process, and support type, CAN was not associated with an increased rate of neurologic complications or stroke (p>0.05 for both).

CONCLUSION

When correcting for patient related factors CAN is not associated with an increase in stroke or neurologic compilcations. CAN should be re-examined as a cannulation technique for older pediatric patients.

LEVEL OF EVIDENCE

III.

Patency of common carotid artery and internal jugular vein after a simple vessel sparing cannulation for extracorporeal membrane oxygenation support

BACKGROUND

Common carotid artery and internal jugular vein are commonly cannulated for establishment of peripheral venoarterial extracorporeal membrane oxygenation (VA ECMO) support. We present our results of a vessel sparing cannulation technique for neck vessels, which helps maintain vessel patency after decannulation.

METHODS

All patients who underwent ECMO, between January 2004 and January 2013 at a single center, were retrospectively reviewed. Follow up data for the patency of common carotid artery (CCA) and internal jugular vein (IJV) after decannulation were recorded.

RESULTS

Twenty-four consecutive patients who were successfully decannulated after VA ECMO support who underwent vessel sparing cannulation were retrospectively reviewed. Follow up data were unavailable in 4 and 1 patient did not survive. Amongst the remaining 19 patients the median duration of ECMO support in the remaining was 7 (IQR; 4-10) days. Follow up studies documenting vessel patency were available for IJV in 18 patients and CCA in 14 patients. At a median follow up of 137days (IQR; 35-7240) 15 (78%) patients had patent IJVs and 14 (100%) patients had patent CCAs.

CONCLUSION

The simple vessel sparing technique is effective in allowing restoration of the patency of the neck vessels after ECMO decannulation.

LEVEL OF EVIDENCE

Case series with no comparison group (Level IV).

Long-term follow-up of congenital diaphragmatic hernia

Increased survival of patients with congenital diaphragmatic hernia has created a unique cohort of children, adolescent, and adult survivors with complex medical and surgical needs. Disease-specific morbidities offer the opportunity for multiple disciplines to unite together to provide long-term comprehensive follow-up, as well as an opportunity for research regarding late outcomes. These children can exhibit impaired pulmonary function, altered neurodevelopmental outcomes, nutritional insufficiency, musculoskeletal changes, and specialized surgical needs that benefit from regular monitoring and intervention, particularly in patients with increased disease severity. Below we aim to characterize the specific challenges that these survivors face as well as present an algorithm for a multidisciplinary long-term follow-up program.

Review of 1,000 consecutive extracorporeal membrane oxygenation runs as a quality initiative

BACKGROUND

Extracorporeal membrane oxygenation is a resource-intensive mode of life-support potentially applicable when conventional therapies fail. Given the initial success of extracorporeal membrane oxygenation to support neonates and infants in the 1980s, indications have expanded to include adolescents, adults, and selected moribund patients during cardiopulmonary resuscitation. This single-institution analysis was conducted to evaluate programmatic growth, outcomes, and risk for death despite extracorporeal membrane oxygenation across all ages and diseases.

METHODS

Beginning in 1989, we registered prospectively all extracorporeal membrane oxygenation patient data with the Extracorporeal Life Support Organization. We queried this registry for our institution-specific data to compare the parameter of "discharge alive" between age groups (neonatal, pediatric, adult), disease groups (respiratory, cardiac, cardiopulmonary resuscitation), and modes of extracorporeal membrane oxygenation (veno-venous; veno-arterial). Extracorporeal membrane oxygenation-specific complications (mechanical, hemorrhagic, neurologic, renal, cardiovascular, pulmonary, infectious, metabolic) were analyzed similarly. Descriptive statistics, Kaplan-Meier, and linear regression analyses were conducted.

RESULTS

After 1,052 extracorporeal membrane oxygenation runs, indications have expanded to include adults, to supplement cardiopulmonary resuscitation, to support hemodialysis in neonates and plasmapheresis in children, and to bridge all age patients to heart and lung transplant. Overall survival to discharge was 52% and was better for respiratory diseases (P < .001). Probability of individual survival decreased to <50% if pre-extracorporeal membrane oxygenation mechanical ventilation exceeded respectively 123 hours for cardiac, 166 hours for cardiopulmonary resuscitation, and 183 hours for respiratory diseases (P = .013). Complications occurred most commonly among cardiac and cardiopulmonary resuscitation runs (P < .001), the veno-arterial mode (P < .001), and in adults (P = .044).

CONCLUSION

Our extracorporeal membrane oxygenation program, an Extracorporeal Life Support Organization-designated Center of Excellence, has experienced substantial growth in volume and indications, including increasing age and disease severity. Considering the entire cohort, pre-extracorporeal membrane oxygenation ventilation exceeding 7 days was associated with an increased probability of death.

Initial Experience With the Pediatric Impella Device: A Feasibility Study in a Porcine Model

OBJECTIVE

This study's objective was to evaluate insertion techniques and device fit of the pediatric version of the Impella ventricular assist device in swine which had similar sized carotids and left ventricles (LVs) as children weighing 10-20 kg.

BACKGROUND

Options for minimally invasive circulatory support in children are limited. A modified device based on the current Impella 2.5 platform was created in an effort to provide minimally invasive circulatory support for children.

METHODS

Animal studies (n = 10) were performed to determine technical feasibility of device implant via the right common carotid artery (RCCA) in swine with a carotid and LV size similar to children with a BSA < 1 m² and weight 10-20 kg. The RCCA diameter was measured on pre-implant ultrasound and the LV length was measured at necropsy. The animals were supported for 4 hr and the device explanted. Blood samples and post-explant necropsy was performed to evaluate for device related complications.

RESULTS

All animals underwent successful device insertion. Mean carotid artery diameter by ultrasound was 3.5 ± 0.3 mm. There was no LV or aortic/mitral valve damage with a minimum LV length of 5.4 cm.

CONCLUSIONS

Minimally invasive circulatory support is needed in small children. Limitations are primarily related to vessel and chamber size. The Impella Pediatric catheter was safely and successfully implanted in carotid arteries similar in size to children weighing 10-20 kg with minimal complications. © 2016 Wiley Periodicals, Inc.

Carotid Artery Dissection Following Neck Cannulation for Extracorporeal Life Support

A term neonate was cannulated for venoarterial extracorporeal life support (ECLS) via the right neck for non-postoperative junctional ectopic tachycardia. Initial echocardiogram demonstrated an echogenic strand in the transverse arch. Computed tomography angiogram confirmed arterial dissection of the right common carotid artery that extended into the proximal transverse arch. Dissection flap was repaired at the time of ECLS decannulation without cardiopulmonary bypass. Follow-up computed tomography angiogram revealed a segment of narrowing of approximately 50% of the right common carotid artery without false lumen or aneurysm.