Publications by authors named "Ralf Muellenbach"

Extracorporeal life support systems (ECLS) are life-sustaining measures for severe cardiovascular diseases, serving as bridging treatment either until cardiovascular function is restored or alternative treatment, such as heart transplantation or the implantation of permanent ventricular assist devices is performed. Given the insufficient evidence and frequent urgency of implantation without initial patient consent, the ethical challenges and psychological burden for patients, relatives and the interprofessional intensive care team are significant. As with any treatment, an appropriate therapeutic goal for ECLS treatment based on the indications and patient informed consent is mandatory.

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Article Synopsis
  • * Expert guidelines now recommend its use, especially highlighted during the COVID-19 pandemic for treating awake patients with respiratory issues.
  • * The approach helps lower ventilator-related lung damage, and the article reviews its physiological effects, clinical outcomes, practical use, and remaining questions.
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Target values for arterial carbon dioxide tension (PaCO 2 ) in extracorporeal membrane oxygenation (ECMO) for acute respiratory distress syndrome (ARDS) are unknown. We hypothesized that lower PaCO 2 values on ECMO would be associated with lighter sedation. We used data from two independent patient cohorts with ARDS spending 1,177 days (discovery cohort, 69 patients) and 516 days (validation cohort, 70 patients) on ECMO and evaluated the associations between daily PaCO 2 , pH, and bicarbonate (HCO 3 ) with sedation.

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Article Synopsis
  • ARDS is a serious condition, impacting over 10% of ICU patients globally with a high mortality rate, making ECMO a potentially vital, but complex, treatment option.
  • Recent research analyzed 283 ARDS patients treated with V-V ECMO in Germany, revealing a median age of 56 and an in-hospital mortality rate of about 50.9%.
  • While various scoring systems were evaluated for predicting patient outcomes, the study concluded that none, including the Simplified Acute Physiology Score-II, demonstrated strong predictive value for selecting patients suitable for ECMO.
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Acute respiratory distress syndrome (ARDS) is a common condition in intensive care medicine. Various intra- and extrapulmonal causes may trigger an epithelial and endothelial permeability increase, which leads to impaired gas exchange due to fluid overload of the alveoli and transmigration of leukocytes. This results in hypoxemia and hypercapnia, as well as deleterious consequences for the macro- and microcirculation with the risk of multi-organ failure and high mortality.

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Article Synopsis
  • ECMO is a life-saving treatment for patients with severe lung injuries, but sometimes it fails to improve low oxygen levels in the blood.
  • Some patients have been treated with a second membrane lung connected either in series (one after the other) or in parallel (side by side) to help with this issue, but it's unclear which method works better.
  • Testing showed that using two lungs in a series configuration was 17% more effective at transferring oxygen compared to a parallel setup, but more research is needed before this approach can be widely adopted due to its invasive nature.
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Veno-arterial extracorporeal life support (ECLS) may be indicated in patients with refractory heart failure. The list of conditions in which ECLS is successfully used is growing and includes cardiogenic shock following myocardial infarction, refractory cardiac arrest, septic shock with low cardiac output and severe intoxication. Femoral ECLS is the most common and often preferred ECLS-configuration in the emergency setting.

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Article Synopsis
  • Interhospital transport of ARDS patients using mobile ECMO units does not increase mortality risks for COVID-19 patients compared to those treated at established ECMO centers.
  • Overall patient characteristics were similar in terms of age, sex, and health scores, suggesting comparable conditions for both transport groups.
  • The study recommends early referral of suitable COVID-19 patients with ARDS to local ECMO centers for optimized care, as transport outcomes align with those treated at specialized facilities.
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Critically ill patients in need of specialized diagnostic or therapeutic procedures, but are being cared for in a hospital without such equipment, have to be transferred to appropriate centers without discontinuation of current critical care (interhospital critical care transfer). These transfers are resource intensive, challenging, and require high logistical effort, which must be managed by a specialized and highly trained team, predeployment planning and efficient crew-resource management strategies. If planned adequately, interhospital critical care transfers can be performed safely without frequent adverse events.

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Background: The SARS-CoV‑2 pandemic posed unexpected challenges for hospitals worldwide and in addition to the supply emergency, simultaneously caused a high pressure to innovate. Due to the high number of cases of COVID-19 patients requiring intensive care, structured networking of hospitals gained particular importance. The tele-ICU communication platform TeleCOVID was developed to improve the quality of intensive care both by enabling teleconsultations and by supporting patient transfers.

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Article Synopsis
  • Critically ill patients sometimes need to be moved from one hospital to another to access specialized care, which requires ongoing critical care during transfer.
  • *These transfers are complex, demanding careful planning and a skilled team to minimize risks and ensure patient safety.
  • *Additionally, there are unique scenarios, like transfers for quarantine patients or those requiring special equipment, that require adjustments in team structure and resources.
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: Extracorporeal hemadsorption eliminates proinflammatory mediators in critically ill patients with hyperinflammation. The use of a pumpless extracorporeal hemadsorption technique allows its early usage prior to organ failure and the need for an additional medical device. In our animal model, we investigated the feasibility of pumpless extracorporeal hemadsorption over a wide range of mean arterial pressures (MAP).

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There is ongoing debate whether lung physiology of COVID-19-associated acute respiratory distress syndrome (ARDS) differs from ARDS of other origin. : The aim of this study was to analyze and compare how critically ill patients with COVID-19 and Influenza A or B were ventilated in our tertiary care center with or without extracorporeal membrane oxygenation (ECMO). We ask if acute lung failure due to COVID-19 requires different intensive care management compared to conventional ARDS.

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Article Synopsis
  • The use of ECLS/ECMO for cardiac and circulatory failure has risen significantly, with about 3,000 implantations each year in Germany, highlighting a need for standardized guidelines.
  • The German Society for Thoracic and Cardiovascular Surgery announced the development of S3 guidelines in July 2015, involving collaboration from multiple scientific societies and patient representatives.
  • Published in February 2021, the guidelines provide evidence-based recommendations on initiation, management, and aftercare of ECLS/ECMO therapy, addressing both clinical practices and economic considerations.
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Background: At the onset of the coronavirus pandemic, concerns were raised about sufficiency of available intensive care resources. In many places, routine interventions were postponed and criteria for the allocation of scarce resources were formulated. In Germany, some hospitals were at times seriously burdened during the course of the pandemic.

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Low flow extracorporeal carbon dioxide removal (ECCO2R) is a promising approach to correct hypercapnic lung failure, facilitate lung protective ventilation in acute respiratory distress syndrome and to possibly prevent the application of invasive ventilation. However, the predominant availability of adult membrane lungs (MLs) at most intensive care units are burdens for low flow ECCO2R that intends to reduce cannula size and promote the mobility of the patients. Herein, in a mock setup, we combine the idea of a low flow ECCO2R and the use of adult MLs by installing a recirculation channel into the circuit and comparing the new setup to an already clinically established setup, "the Homburg lung.

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Background: Severe COVID-19 induced acute respiratory distress syndrome (ARDS) often requires extracorporeal membrane oxygenation (ECMO). Recent German health insurance data revealed low ICU survival rates. Patient characteristics and experience of the ECMO center may determine intensive care unit (ICU) survival.

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Extracorporeal membrane oxygenation (ECMO) has become an important therapeutic approach in the COVID-19 pandemic. The development and research in this field strongly relies on animal models; however, efforts are being made to find alternatives. In this work, we present a new mock circuit for ECMO that allows measurements of the oxygen transfer rate of a membrane lung at full ECMO blood flow.

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Coronavirus disease 2019 (COVID-19) has drastically increased the number of patients requiring extracorporeal life support. We investigate the efficacy and safety of low-dose recombinant tissue-type plasminogen activator (rtPA) injection into exhausted oxygenators to delay exchange in critically ill COVID-19 patients on veno-venous extracorporeal membrane oxygenation (V-V ECMO). Small doses of rtPA were injected directly into the draining section of a V-V ECMO circuit.

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Study Objective: We explored the feasibility of a Clinical Decision Support System (CDSS) to guide evidence-based perioperative anticoagulation.

Design: Prospective randomised clinical management simulation multicentre study.

Setting: Five University and 11 general hospitals in Germany.

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Article Synopsis
  • In late 2020, the MobyBox, a new ECMO device, was used in Germany to meet the high demand for ECMO therapy during the COVID-19 crisis, particularly for patients with severe ARDS.
  • A review of seven patients treated with the MobyBox showed no system failures or adverse events, indicating that it is safe and effective compared to traditional ECMO systems.
  • The study suggests the MobyBox may offer better biocompatibility, but further research is necessary to evaluate how its pneumatically driven pump impacts blood components.
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  • The study investigates whether cancer patients with severe respiratory failure gain any survival benefits from using veno-venous extracorporeal membrane oxygenation (vv-ECMO).
  • It analyzes data from 297 cancer patients treated with vv-ECMO between 2009 and 2019 across German and Austrian hospitals, revealing a low 60-day overall survival rate of 26.8%.
  • Findings indicate that factors like low platelet count, high lactate levels, and certain disease statuses negatively impact survival, but the study concludes that the overall efficacy of vv-ECMO in these patients remains uncertain, highlighting the need for further research.
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