Publications by authors named "Graeme Maclaren"

Objectives: To determine if a priori standardization of outcome hemostatic definitions alone was adequate to enable useful comparison between two cohorts of pediatric extracorporeal membrane oxygenation (ECMO) patients, managed according to local practice and protocol.

Design: Comparison of two separate prospective cohort studies performed at different centers with standardized outcome definitions agreed upon a priori.

Setting: General and cardiac PICUs at the Royal Children's Hospital (RCH) in Melbourne, Australia, and the Sophia Children's Hospital (SCH) in Rotterdam, The Netherlands.

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Background: Critical care of patients on extracorporeal membrane oxygenation (ECMO) with acute brain injury (ABI) is notable for a lack of high-quality clinical evidence. Here, we offer guidelines for neurological care (neurological monitoring and management) of adults during and after ECMO support.

Methods: These guidelines are based on clinical practice consensus recommendations and scientific statements.

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Article Synopsis
  • The text discusses the occurrence of dual circulation during venoarterial extracorporeal membrane oxygenation (VA-ECMO), where blood from the body and an artificial heart/lung system mix, resulting in differing oxygen and carbon dioxide levels in two separate circulations.
  • This phenomenon arises when native blood flow from the heart meets retrograde blood flow from the artificial system, creating distinct physiological environments on either side of the mixing point.
  • The authors aim to clarify the terminology surrounding this issue to improve communication and clinical management for patients undergoing VA-ECMO treatment.
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Article Synopsis
  • ECMO is a complex and risky life support system that lacks standardized definitions for adverse outcomes, which hinders effective research and practices.
  • The ECMO-CENTRAL ARC was formed to create clear definitions for pediatric ECMO adverse events, using input from literature and a diverse expert panel.
  • After three rounds of surveys, 13 key adverse event definitions were established and unanimously agreed upon by the voting experts.
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Article Synopsis
  • - The text discusses the lack of strong clinical evidence in the critical care of ECMO patients with acute brain injury (ABI) and presents guidelines for their neurological care.
  • - Guidelines were developed using input from an international panel of 30 ECMO experts through a structured voting process, focusing on five key clinical areas.
  • - The consensus emphasizes the importance of early detection and intervention for ABI in ECMO patients to improve health outcomes and outlines multiple recommendations to guide clinical practice and highlight research needs.
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  • A study analyzed data from over 7,000 COVID-19 patients on ECMO from 2020 to 2021 to investigate the impact of different immunomodulator treatments on mortality rates.
  • Results showed that patients receiving no immunomodulators had the highest 90-day survival rate (58.1%), while those getting only corticosteroids had the lowest (50.7%), and patients on other immunomodulators alone had better outcomes (62.2%).
  • The study concluded that using corticosteroids alone or with other immunomodulators leads to shorter survival, while other immunomodulators alone may improve survival, but all immunomodulator treatments were linked to increased secondary infections.
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Objective: To characterize surface-bound proteins and to measure the thickness of fibrin fibers bound to extracorporeal membrane oxygenation (ECMO) circuits used in children.

Design: Single-center observational prospective study, April to November 2021.

Setting: PICU, Royal Children's Hospital, Melbourne, Australia.

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Article Synopsis
  • ECLS cannulation in post-cardiotomy patients is uncommon in general wards, with only 39 out of 2058 patients studied undergoing the procedure while at the hospital.
  • The majority of these patients faced complications like acute kidney injury and arrhythmias, with a high in-hospital mortality rate of 84.6%, predominantly due to persistent heart failure.
  • Findings suggest that ECLS cannulation mainly affects low-risk patients who experience cardiac arrest post-surgery, indicating a need for further research into improving outcomes.
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The continuous contact between blood and the foreign surface of the extracorporeal membrane oxygenation (ECMO) circuit contributes to hemostatic, inflammatory, and other physiological disturbances observed during ECMO. Although previous studies have extensively investigated blood samples from patients on ECMO, cell adsorption to the ECMO circuit as an additional factor that could potentially influence clinical outcomes, has largely been overlooked. Here we provide a detailed immunofluorescence (IF) protocol designed to characterize cellular binding on ECMO circuits collected from patients.

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As survival after ECMO improves and use of ECMO support increases in both pediatric and adult population, there is a need to focus on both the morbidities and complications associated with ECMO and how to manage and prevent them. Infectious complications during ECMO often have a significant clinical impact, resulting in increased morbidity or mortality irrespective of the underlying etiology necessitating cardiorespiratory support. In this review article, we discuss the prevention, management, challenges, and differences of infectious complications in adult and pediatric patients receiving ECMO support.

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Article Synopsis
  • * Conducted across 34 centers globally from 2000 to 2020, the study included over 2,000 adult patients split into different ECMO duration groups, revealing higher complications and mortality rates associated with longer ECMO durations.
  • * The findings suggest that while most in-hospital complications increase with ECMO duration, post-discharge survival rates remain similar across groups, with specific risk factors like age and pre-existing conditions affecting long-term survival for those on ECMO longer than 7 days.
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Limb ischaemia is a clinically relevant complication of venoarterial extracorporeal membrane oxygenation (VA ECMO) with femoral artery cannulation. No selective distal perfusion or other advanced techniques were used in the past to maintain adequate distal limb perfusion. A more recent trend is the shift from the reactive or emergency management to the pro-active or prophylactic placement of a distal perfusion cannula to avoid or reduce limb ischaemia-related complications.

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Background: Clinical practice guidelines on limitation of life-sustaining treatments (LST) in the intensive care unit (ICU), in the form of withholding or withdrawal of LST, state that there is no ethical difference between the two. Such statements are not uniformly accepted worldwide, and there are few studies on LST limitation in Asia. This study aimed to evaluate the predictors and outcomes of withholding and withdrawal of LST in Singapore, focusing on the similarities and differences between the two approaches.

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Article Synopsis
  • Over the last decade, the use of ECMO (extracorporeal membrane oxygenation) has significantly increased for patients with severe heart or lung failure, revealing varied practices across different healthcare facilities.
  • Infectious disease experts face challenges due to limited and conflicting research, which impacts infection control and antimicrobial strategies within ECMO patient care.
  • The review highlights gaps in existing ECMO literature, calls for clearer definitions of infections, and stresses the importance of transparent reporting in clinical trials for better future practices.
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Purpose: Venovenous extracorporeal membrane oxygenation (VV-ECMO) can be used to support patients with refractory acute respiratory failure, though guidance on patient selection is lacking. While age is commonly utilized as a factor in establishing the potential VV-ECMO candidacy of these patients, little is known regarding its association with outcome. We studied the association between increasing patient age and outcomes among patients with acute respiratory failure receiving VV-ECMO.

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Purpose: Cardiogenic shock is associated with high mortality. In refractory shock, it is unclear if mechanical circulatory support (MCS) devices improve survival. We conducted a network meta-analysis to determine which MCS devices confers greatest benefit.

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Background: The use of extracorporeal membrane oxygenation (ECMO) for high-risk pulmonary embolism (HRPE) with haemodynamic instability or profound cardiogenic shock has been reported. Guidelines currently support the use of ECMO only in patients with cardiac arrest or circulatory collapse and in conjunction with other curative therapies. We aimed to characterise the mortality of adults with HRPE treated with ECMO, identify factors associated with mortality, and compare different adjunct curative therapies.

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