Extracorporeal Membrane Oxygenation for Septic Shock in Children

Outcome of extracorporeal membrane oxygenation support among children with methicillin-resistant Staphylococcus aureus infection: A single-center experience

Introduction: The use of extracorporeal membrane oxygenation (ECMO) in children continues to increase nationally, including patients with methicillin-resistant Staphylococcus aureus (MRSA) infection. Survival of pediatric patients with MRSA sepsis has not improved over the last 20 years. We sought to review our institutional experience and outcomes of ECMO support among children with MRSA infection.Methods: Children aged 0-19 years who received ECMO support from October 2014 to June 2021 were reviewed retrospectively. Patients with laboratory confirmed MRSA infections were identified.Results: Out of 88 unique pediatric patients requiring ECMO support, eight patients had documented MRSA infections. The duration of mechanical ventilation prior to ECMO initiation was an average of seven days (range 0.7 to 21.8 days). The median ECMO duration was 648.1 h (range 15.5 to 1580.5 h). Five patients were successfully decannulated; however, only two patients survived to discharge. The two surviving patients were both cannulated via VV-ECMO. Mechanical ventilation prior to ECMO was 4.5 and 21.8 days in these cases with run durations of 18.9 and 29.9 days, respectively.Conclusions: Our institutional survival of patients with MRSA on ECMO is lower than what has been reported in recent database studies, but notably, 62.5% were successfully decannulated. While both surviving patients were supported with VV-ECMO, there was no other clear trend in factors that contributed to survival. MRSA continues to be a source of significant morbidity and mortality among pediatric patients. On-going investigation of outcomes and factors contributing to survival in patients with MRSA infection on ECMO is warranted.

Mechanical Circulatory Support for Septic Shock in Children and Adults: Different But Similar

Although extracorporeal membrane oxygenation (ECMO) for circulatory support in patients with severe septic shock commenced in newborn infants and children in the late 1980s, ECMO has remained a controversial treatment for adults with refractory septic shock (RSS). This is fundamentally because of differences in the predominant hemodynamic response to sepsis. In newborn infants and very young children ventricular failure, low cardiac output syndrome (LCOS) is the major hemodynamic response whereas adolescents and adults mainly have vasoplegic shock. ECMO is a very effective treatment for cardiogenic shock even shock caused by sepsis, with a survival that has varied from 40% to 70%; vasoplegic shock, however, requires vasopressors rather than ECMO, and hence survival of these patients with ECMO was poor (< 20%). However, since the early 2000s, sepsis- induced cardiomyopathy (SCM) with ventricular failure (identical to LCOS in children) has been increasingly described in adults, and the occurrence of cardiogenic shock caused by septic shock is treatable with ECMO. In the last 6 years, increasing publications of series of adults with RSS and cardiogenic shock receiving ECMO and ∼70+% surviving has led to increased use of VA ECMO for RSS.

Central or Peripheral Venoarterial Extracorporeal Membrane Oxygenation for Pediatric Sepsis: Outcomes Comparison in the Extracorporeal Life Support Organization Dataset, 2000-2021

OBJECTIVES

Small studies of extracorporeal membrane oxygenation (ECMO) support for children with refractory septic shock (RSS) suggest that high-flow (≥ 150 mL/kg/min) venoarterial ECMO and a central cannulation strategy may be associated with lower odds of mortality. We therefore aimed to examine a large, international dataset of venoarterial ECMO patients for pediatric sepsis to identify outcomes associated with flow and cannulation site.

DESIGN

Retrospective analysis of the Extracorporeal Life Support Organization (ELSO) database from January 1, 2000, to December 31, 2021.

SETTING

International pediatric ECMO centers.

PATIENTS

Patients 18 years old young or younger without congenital heart disease (CHD) cannulated to venoarterial ECMO primarily for a diagnosis of sepsis, septicemia, or septic shock.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Of 1242 pediatric patients undergoing venoarterial ECMO runs in the ELSO dataset, overall mortality was 55.6%. We used multivariable logistic regression analyses to evaluate explanatory factors associated with adjusted odds ratios (aORs) and 95% CI of mortality. In the regression analysis of data 4 hours after ECMO initiation, logarithm of the aOR, plotted against ECMO flow as a continuous variable, showed that higher flow was associated with lower aOR of mortality ( p = 0.03). However, at 24 hours, we failed to find such a relationship. Finally, peripheral cannulation, as opposed to central cannulation, was independently associated with greater odds of mortality (odds ratio, 1.7 [95% CI, 1.1-2.6]).

CONCLUSIONS

In this 2000-2021 international cohort of venoarterial ECMO for non-CHD children with sepsis, we have found that higher ECMO flow at 4 hours after support initiation, and central- rather than peripheral-cannulation, were both independently associated with lower odds of mortality. Therefore, flow early in the ECMO run and cannula location are two important factors to consider in future research in pediatric patients requiring cannulation to venoarterial ECMO for RSS.

What's new in pediatric critical care?

Pediatric intensive care medicine is a rapidly evolving field of medicine, with recent publication of landmark papers specific for the pediatric population. Progress has been made in modes of mechanical ventilation, including noninvasive ventilation in pediatric ARDS and after extubation failure, with updated guidelines on ventilator liberation. Improved technology and advancements in hemodynamic support allow for better care of our patients with heart disease. Sepsis burden in children remains high and continued efforts are made to improve survival. A nutritional plan with a tailored approach, focusing on individualized needs, could offer benefits for our patients. Sedation practices and guidelines have been updated, focusing on minimizing delirium and facilitating early mobility. This manuscript highlights some of the most recent advances and updates.

Peripheral Veno-Arterial-Extracorporeal Membrane Oxygenation for Refractory Septic Shock in Children: A Multicenter Review

BACKGROUND

Extracorporeal membrane oxygenation (ECMO) is utilized as a rescue therapy in the management of pediatric patients with refractory septic shock. Multiple studies support the use of a central cannulation strategy in these patients. This study aimed to assess the survival of and identify mortality risk factors in pediatric patients supported with peripheral veno-arterial (VA) ECMO in the setting of septic shock.

METHODS

We retrospectively reviewed and compared clinical characteristics of 40 pediatric patients supported with peripheral VA ECMO for refractory septic shock, at two tertiary care children's hospitals from 2006 to 2020. Our hypothesis was that peripheral VA ECMO is effective in supporting cardiac function and improving tissue oxygenation in most pediatric patients with refractory septic shock.

RESULTS

The overall rate of survival to discharge was 52.5%, comparable to previously reported survival for pediatric sepsis on ECMO. With the exclusion of patients with an oncologic process, the survival rate rose to 62.5%. There was a statistically significant difference in mean pump flow rates within 2 hours of initiation of ECMO between survivors and non-survivors (98 mL/kg/min vs 76 mL/kg/min, P  =  .050). There was no significant difference between pre-ECMO vasoactive inotropic score (VIS) in survivors and non-survivors. A faster decrease in VIS in the first 24 hours was associated with lower mortality.

CONCLUSIONS

From this large case series, we conclude that peripheral VA ECMO is a safe and effective modality to support pediatric patients with refractory septic shock, provided there is establishment of high ECMO pump flows in the first few hours after cannulation and improvement in the VIS.

Extracorporeal membrane oxygenation in adult patients with sepsis and septic shock: Why, how, when, and for whom

Sepsis and septic shock remain the leading causes of death in intensive care units. Some patients with sepsis fail to respond to routine treatment and rapidly progress to refractory respiratory and circulatory failure, necessitating extracorporeal membrane oxygenation (ECMO). However, the role of ECMO in adult patients with sepsis has not been fully established. According to existing studies, ECMO may be a viable salvage therapy in carefully selected adult patients with sepsis. The choice of venovenous, venoarterial, or hybrid ECMO modes is primarily determined by the patient's oxygenation and hemodynamics (distributive shock with preserved cardiac output, septic cardiomyopathy (left, right, or biventricular heart failure), or right ventricular failure caused by acute respiratory distress syndrome). Veno-venous ECMO can be used in patients with sepsis and severe acute respiratory distress syndrome when conventional mechanical ventilation fails, and early application of veno-arterial ECMO in patients with sepsis-induced refractory cardiogenic shock may be critical in improving their chances of survival. When ECMO is indicated, the choice of an appropriate mode and determination of the optimal timing of initiation and weaning are critical, particularly in an experienced ECMO center. Furthermore, some special issues, such as ECMO flow, anticoagulation, and antibiotic therapy, should be noted during the management of ECMO support.

Extracorporeal Membrane Oxygenation for Septic Shock in Adults and Children: A Narrative Review

Refractory septic shock is associated with a high risk of death. Circulatory support in the form of veno-arterial extracorporeal membrane oxygenation (VA ECMO) may function as a bridge to recovery, allowing for the treatment of the source of the sepsis. Whilst VA ECMO has been accepted as the means of hemodynamic support for children, in adults, single center observational studies show survival rates of only 70-90% for hypodynamic septic shock. The use of VA ECMO for circulatory support in hyperdynamic septic shock with preserved cardiac output or when applied late during cardio-pulmonary resuscitation is not recommended. With unresolving septic shock and a loss of ventriculo-arterial coupling, stress cardiomyopathy often develops. If the cardiac index (CI) approaches subnormal levels (CI < 2.5 L/min m-2) that do not match low systemic vascular resistance with a resulting loss of vital systemic perfusion pressure, VA ECMO support should be considered. A further decrease to the level of cardiogenic shock (CI < 1.8 L/min m-2) should be regarded as an indication for VA ECMO insertion. For patients who maintain a normal-to-high CI as part of their refractory vasoparalysis, VA ECMO support is justified in children and possibly in patients with a low body mass index. Extracorporeal support for septic shock should be limited to high-volume ECMO centers.

Pediatric venoarterial and venovenous ECMO

Extracorporeal membrane oxygenation (ECMO) is an invaluable resource in the treatment of critically ill children with cardiopulmonary failure.  To date, over 36,000 children have been placed on ECMO and the utilization of this life saving treatment continues to expand with advances in ECMO technology.  This article offers a review of pediatric ECMO including modes and sites of ECMO cannulation, indications and contraindications, and cannulation techniques.  Furthermore, it summarizes the basic principles of pediatric ECMO including circuit maintenance, nutritional support, and clinical decision making regarding weaning pediatric ECMO and decannulation.  Finally, it gives an overview of common pediatric ECMO complications including overall mortality and long-term outcomes of ECMO survivors. The goal of this article is to provide a comprehensive review for healthcare professionals providing care for pediatric ECMO patients.

Pediatric Sepsis: a Summary of Current Definitions and Management Recommendations

Purpose of Review

Pediatric sepsis remains an important cause of morbidity and mortality in children. This review will summarize the main aspects of the definition, the current evidence base for interventions discuss some controversial themes and point towards possible areas of improvement.

Recent Findings

Controversy remains regarding the accurate definition, resuscitation fluid volume and type, choice of vasoactive/inotropic agents, and antibiotic depending upon specific infection risks. Many adjunctive therapies have been suggested with theoretical benefits, although definitive recommendations are not yet supported by data. We describe best practice recommendations based on international guidelines, a review of primary literature, and a discussion of ongoing clinical trials and the nuances of therapeutic choices.

Summary

Early diagnosis and timely intervention with antibiotics, fluid resuscitation, and vasoactive medications are the most important interventions in sepsis. The implementation of protocols, resource-adjusted sepsis bundles, and advanced technologies will have an impact on reducing sepsis mortality.