Publications by authors named "Niesen W"

We report the case of a young patient with severe hypoxic brain injury after cardiopulmonary resuscitation, resulting in brain death/death by neurologic criteria (BD/DNC). Consistent with the patient's expressed wishes, treatment was sustained to facilitate organ donation. However, in the context of a severe post-resuscitation syndrome and physiological disturbances resulting from BD/DNC, refractory circulatory shock ensued.

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Article Synopsis
  • - Non-fatal strangulation is a critical issue in clinical forensic medicine, where victims show a range of signs and symptoms that can confuse the investigation of neck compression events.
  • - A case study involving a healthy middle-aged woman found on the bathroom floor revealed signs of neck compression and neurological symptoms, prompting a medico-legal investigation due to a history of domestic violence.
  • - The investigation combined clinical, radiological, and forensic findings to rule out homicide and suicide, concluding it was an accidental hanging caused by a stroke, highlighting the need for thorough examination in similar cases.
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Background: The apnea test (AT) is an important component in the determination of brain death/death by neurologic criteria (BD/DNC) and often entails disconnecting the patient from the ventilator followed by tracheal oxygen insufflation to ensure adequate oxygenation. To rate the test as positive, most international guidelines state that a lack of spontaneous breathing must be demonstrated when the arterial partial pressure of carbon dioxide (PaCO) ≥ 60 mm Hg. However, the loss of positive end-expiratory pressure that is associated with disconnection from the ventilator may cause rapid desaturation.

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  • Patients with sudden impaired consciousness have a high mortality rate, with 10% not surviving, and multiple underlying causes are often found.
  • Impairment is categorized into quantitative (reduced wakefulness) and qualitative (abnormal content), with about 45-50% linked to neurological issues and 20% to metabolic or infectious origins.
  • Quick recognition of warning signs ("red flags") and immediate treatment in a shock room are crucial for managing these medical emergencies.
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Purpose: The Harlequin syndrome may occur in patients treated with venoarterial extracorporal membrane oxygenation (VA-ECMO), in whom blood from the left ventricle and the ECMO system supply different parts of the body with different pCO-levels. The purpose of this study was to compare two variants of pCO-analysis to account for the Harlequin syndrome during apnea testing (AT) in brain death (BD) determination.

Materials And Methods: Twenty-seven patients (median age 48 years, 26-76 years; male n = 19) with VA-ECMO treatment were included who underwent BD determination.

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Background: Tracheostomy in mechanically ventilated patients with severe stroke can be performed surgically or dilationally. Prospective data comparing both methods in patients with stroke are scarce. The randomized Stroke-Related Early Tracheostomy vs Prolonged Orotracheal Intubation in Neurocritical Care Trial2 (SETPOINT2) assigned 382 mechanically ventilated patients with stroke to early tracheostomy versus extubation or standard tracheostomy.

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Background: Chronic pancreatitis (CP) causes suffering and socioeconomic burden. This study evaluated perioperative results and patient-reported outcomes (PRO) in CP patients treated with duodenum-preserving pancreatic head resection (DPPHR).

Methods: Data were analyzed of CP patients undergoing DPPHR between 01/2001-10/2014.

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Background: To evaluate the feasibility and safety of a fast initiation of cooling to a target temperature of 35°C by means of transnasal cooling in patients with anterior circulation large vessel occlusion (LVO) undergoing endovascular thrombectomy (EVT).

Methods: Patients with an LVO onset of <24 hour who had an indication for EVT were included in the study. Transnasal cooling (RhinoChill) was initiated immediately after the patient was intubated for EVT and continued until an oesophageal target temperature of 35°C was reached.

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Background: Clinical observations indicated that vaccine-induced immune thrombosis with thrombocytopenia (VITT)-associated cerebral venous sinus thrombosis (CVST) often has a space-occupying effect and thus necessitates decompressive surgery (DS). While comparing with non-VITT CVST, this study explored whether VITT-associated CVST exhibits a more fulminant clinical course, different perioperative and intensive care unit management, and worse long-term outcome.

Methods: This multicenter, retrospective cohort study collected patient data from 12 tertiary centers to address priorly formulated hypotheses concerning the clinical course, the perioperative management with related complications, extracerebral complications, and the functional outcome (modified Rankin Scale) in patients with VITT-associated and non-VITT CVST, both with DS.

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Background: Although the relevance of neurointensive medicine and high-quality training of corresponding physicians is increasingly recognized, there is high heterogeneity in the nature, duration, and quality of neurointensive care curricula around the world. Thus, we aimed to identify, define, and establish validity evidence for entrustable professional activities (EPAs) for postgraduate training in neurointensive care to determine trainees' readiness for being on-call.

Methods: After defining EPAs through an iterative process by an expert group, we used a modified Delphi approach with a single-center development process followed by a national consensus and a single-center validation step.

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Background: A broader distribution of bedside color-coded duplex sonography (CCD) for detection of cerebral circulatory arrest (CCA) would be important to improve its use in the diagnosis of irreversible loss of brain function (ILBF-Dx).

Question: Is extracranial compared to the commonly applied transcranial CCD of the brain-supplying vessels (ECCD vs. TCCD) equivalent for the detection of CCA in ILBF-Dx regarding specificity and sensitivity?

Material And Methods: Study period January 2019-June 2022, screening of 136 and inclusion of 114 patients with severe brain lesions > 24 h after onset of fixed and dilated pupils, apnea and completed ILBF-Dx.

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Background And Purpose: The role of surgery in the treatment of intracerebral haemorrhage (ICH) remains controversial. Whereas open surgery has failed to show any clinical benefit, recent studies have suggested that minimal invasive procedures can indeed be beneficial, especially when they are applied at an early time point. This retrospective study therefore evaluated the feasibility of a free-hand bedside catheter technique with subsequent local lysis for early haematoma evacuation in patients with spontaneous supratentorial ICH.

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Background: Transcranial color-coded duplex sonography (TCCD) can be used as an ancillary test for determining irreversible loss of brain function (ILBF) when demonstration of cerebral circulatory arrest (CCA) is required. However, visualization of the intracranial vessels by TCCD is often difficult, or even impossible, in this patient cohort due to elevated intracranial pressure, an insufficient transtemporal bone window, or warped anatomical conditions. Since extracranial color-coded duplex sonography (ECCD) can be performed without restriction in the aforementioned situations, we investigated the feasibility of omitting TCCD altogether, such that the ILBF examination would be simplified, without compromising on its reliability.

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Background: The optimal treatment for patients with asymptomatic carotid artery stenosis is under debate. Since best medical treatment (BMT) has improved over time, the benefit of carotid endarterectomy (CEA) or carotid artery stenting (CAS) is unclear. Randomised data comparing the effect of CEA and CAS versus BMT alone are absent.

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Importance: Many patients with severe stroke have impaired airway protective reflexes, resulting in prolonged invasive mechanical ventilation.

Objective: To test whether early vs standard tracheostomy improved functional outcome among patients with stroke receiving mechanical ventilation.

Design, Setting, And Participants: In this randomized clinical trial, 382 patients with severe acute ischemic or hemorrhagic stroke receiving invasive ventilation were randomly assigned (1:1) to early tracheostomy (≤5 days of intubation) or ongoing ventilator weaning with standard tracheostomy if needed from day 10.

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Background And Objectives: In 2020, a wide range of hygiene measures was implemented to mitigate infections caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). In consequence, pulmonary infections due to other respiratory pathogens also decreased. Here, we evaluated the number of bacterial and viral meningitis and encephalitis cases during the coronavirus disease 2019 (COVID-19) pandemic.

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Background: The prognostic impact of margin status is reported with conflicting results after pancreatic cancer resection. While some studies validated an uninvolved resection margin (R0) 1 mm or more of tumour clearance, others have failed to show benefit. This systematic review and meta-analysis aimed to investigate the effects of margin definitions on median overall survival (OS).

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Transient global amnesia (TGA) is a self-limiting neurological condition that temporarily affects patients' ability to access and store memories. So far, its etiology is unknown; however, ischemic origin has been discussed in the past. We present the case of a 61-year-old female with clinical appearance of TGA.

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Article Synopsis
  • The study investigates the use of contrast-enhanced ultrasound perfusion imaging (UPI) to detect cerebral hypoperfusion following aneurysmal subarachnoid hemorrhage (aSAH).
  • UPI was performed every two days post-aneurysm closure on 30 aSAH patients, finding significant changes in perfusion, particularly a notable increase in the left-right time to peak (TTP) values in patients with delayed ischemic neurologic deficit (DIND).
  • The results indicate that UPI is a promising tool for identifying cerebral hypoperfusion in aSAH patients, with the left-right TTP difference being a key indicator of DIND.
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Organizing regional stroke care considering thrombolysis as well as mechanical thrombectomy (MTE) remains challenging in light of a wide range of regional population distribution. To compare outcomes of patients in a stroke network covering vast rural areas in southwestern Germany who underwent MTE via direct admission to a single comprehensive stroke center [CSC; mothership (MS)] with those of patients transferred from primary stroke centers [PSCs; drip-and-ship (DS)], we undertook this analysis of consecutive stroke patients with MTE. Patients who underwent MTE at the CSC between January 2013 and December 2016 were included in the analysis.

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  • HO-1 mRNA levels increased significantly in cerebrospinal fluid (CSF) of patients with subarachnoid hemorrhage (SAH) over a 14-day period, indicating a response to cerebral inflammation.
  • While higher levels of HO-1 in CSF correlated with the burden of intracranial blood, it did not serve as an effective predictor of clinical outcomes measured by the Modified Rankin Scale.
  • Interestingly, patients with vasospasm had lower HO-1 levels by day 7, while those experiencing delayed cerebral ischemia (DCI) exhibited higher levels by day 14, suggesting a complex relationship between inflammation and injury patterns post-SAH.
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Background: Asymptomatic carotid artery stenosis (ACS) has a low risk of stroke. To achieve an advantage over noninterventional best medical treatment (BMT), carotid endarterectomy (CEA) or carotid artery stenting (CAS) must be performed with the lowest possible risk of stroke. Therefore, an analysis of risk-elevating factors is essential.

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Selective therapeutic hypothermia (TH) showed promising preclinical results as a neuroprotective strategy in acute ischemic stroke. We aimed to assess safety and feasibility of an intracarotid cooling catheter conceived for fast and selective brain cooling during endovascular thrombectomy in an ovine stroke model.Transient middle cerebral artery occlusion (MCAO, 3 h) was performed in 20 sheep.

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