Publications by authors named "Tobias Werther"

Article Synopsis
  • - A study developed an adaptive threshold algorithm for detecting burst patterns in EEG recordings of preterm infants to improve analysis accuracy in clinical settings.
  • - The algorithm was tested on 30 real-world EEG recordings, showing a substantial interrater agreement with a kappa score of 0.73, indicating its reliability compared to human raters.
  • - The algorithm achieved high sensitivity (0.90) and specificity (0.95), demonstrating its effectiveness as a valuable tool for automated burst detection in preterm infant EEGs.
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Objective: The aim of this study was the evaluation of the impact of a respiratory function monitor (RFM, Neo100, Monivent AB, Gothenburg, Sweden) on the quality of ventilation in neonates.

Methods: This single-center two-phase intervention study was conducted at the Neonatal Intensive Care Unit and the delivery room of the Medical University of Vienna. Patients with clinical need for positive pressure ventilation were included in either of two consecutive study phases: (i) patients were ventilated with a hidden RFM (control) or (ii) visible RFM (intervention) during manual positive pressure ventilations.

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Background: This multicentre, international, retrospective study aimed to investigate whether respiratory system reactance ( ) assessed by respiratory oscillometry on day 7 of life is associated with respiratory outcomes in preterm infants below 32 weeks gestational age (GA).

Methods: Sinusoidal pressure oscillations (2-5 cmHO peak-to-peak, 10 Hz) were superimposed on the positive end-expiratory pressure. We assessed the association of z-score with the duration of respiratory support using linear regression and with bronchopulmonary dysplasia (BPD) using logistic regression.

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Objective: To determine the effect of different types of probes for lung ultrasound in neonates.

Design: Prospective, blinded, randomized, comparative study between 2020 and 2022.

Setting: Single-center study at a third level neonatal unit.

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Rationale: Lung recruitment and continuous distending pressure (CDP) titration are critical for assuring the efficacy of high-frequency ventilation (HFOV) in preterm infants. The limitation of oxygenation (peripheral oxygen saturation, SpO) in optimizing CDP calls for evaluating other non-invasive bedside measurements. Respiratory reactance (Xrs) at 10 Hz measured by oscillometry reflects lung volume recruitment and tissue strain.

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Aim: Respiratory distress syndrome often necessitates endotracheal surfactant administration in extremely preterm infants. Our study aimed to explore a multi-modal simulation tool for investigating treatment strategies in ex vivo sheep lungs during spontaneous breathing.

Methods: An electromechanical lung simulator (xPULM) mimicking spontaneous breathing was coupled with a non-aerated premature sheep lung, replicating a premature respiratory system.

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Because of its simplicity, pulse oximetry plays a ubiquitous role in neonatology. Its measurements are based on the absorption of light by hemoglobin. Ambient light can affect these values, therefore algorithms are designed to compensate for constant ambient light.

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Backgrounds: This study aimed to determine the best educational application of a respiratory function monitor and a video laryngoscope.

Methods: This study was a randomized controlled simulation-based trial, including 167 medical students. Participants had to execute ventilation and intubation maneuvers on a newborn manikin.

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Article Synopsis
  • This study investigated the impact of scheduled lung recruitment maneuvers (LRMs) versus only when needed on extremely preterm infants undergoing high-frequency oscillatory ventilation (HFOV).* -
  • In a randomized controlled trial with 30 infants (15 in each group), results showed no significant difference in the cumulative oxygen saturation index (OSI) or frequency of LRMs between both groups over a week.* -
  • The findings suggest that performing LRMs regularly doesn't enhance lung volume compared to clinically indicated maneuvers, with most benefit seen when oxygen levels (FiO2) are high.*
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We present a novel approach of ventilation, using high-frequency oscillation ventilation (HFOV), during neonatal cardiopulmonary resuscitation (CPR) of a very preterm neonate. This case report highlights the importance of adequate lung inflation, which is a current topic, with neonatal resuscitation guidelines recommending a coordinated 3:1 compression:ventilation ratio during CPR. Our patient, a female infant born at 30 weeks gestational age, weighing 970 g, appeared floppy and apneic following birth in the amniotic sac.

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Objective: The aim of the study was to determine the predictive power of the combined use of neurophysiological (amplitude-integrated electroencephalography [aEEG], near-infrared spectroscopy [NIRS]) methods and neuroimaging (magnetic resonance imaging [MRI]) for long-term outcome prediction in neonates with hypoxic-ischaemic encephalopathy (HIE).

Study Design: Prospective cohort study of 56 patients with moderate to severe HIE and hypothermia treatment at the Medical University of Vienna between 2008 and 2020. aEEG and NIRS were recorded continuously over a period of >4 days (102 h) starting at the initiation of hypothermia treatment, MRI was performed at a median age of 8 days.

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Background: Endotracheal intubation is a common procedure in Neonatal Intensive Care. While cuffed endotracheal tubes (ETT) are the standard of care in adults and children, their use in infants is controversial. The aim of this study was to compare the incidence of post-extubation stridor between uncuffed and cuffed ETTs in infants.

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Electrical impedance segmentography offers a new radiation-free possibility of continuous bedside ventilation monitoring. The aim of this study was to evaluate the efficacy and reproducibility of this bedside tool by comparing synchronized intermittent mandatory ventilation (SIMV) with neurally adjusted ventilatory assist (NAVA) in critically-ill children. In this prospective randomized case-control crossover trial in a pediatric intensive care unit of a tertiary center, including eight mechanically-ventilated children, four sequences of two different ventilation modes were consecutively applied.

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Differences in management and outcomes of extremely preterm infants have been reported across European countries. Implementation of standardized guidelines and interventions within existing neonatal care facilities can improve outcomes of extremely preterm infants. This study evaluated whether a multifactorial educational training (MET) course in Vienna focusing on the management of extremely preterm infants had an impact on the management of extremely preterm infants in Central-Eastern European (CEE) countries.

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Lung ultrasound makes use of artifacts generated by the ratio of air and fluid in the lung. Recently, an enormous increase of research regarding lung ultrasound emerged, especially in intensive care units. The use of lung ultrasound on the neonatal intensive care unit enables the clinician to gain knowledge about the respiratory condition of the patients, make quick decisions, and reduces exposure to ionizing radiation.

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Objective: To assess the reliability, accuracy and precision of distal end-tidal capnography (detCO) in neonates compared with transcutaneous (tcCO) carbon dioxide measurements.

Design: Observational, prospective clinical study.

Setting: Neonatal intensive care unit at Medical University of Vienna.

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Background: Despite current progress in research of congenital diaphragmatic hernia, its management remains challenging, requiring an interdisciplinary team for optimal treatment.

Objective: Aim of the present study was to evaluate potential risk factors for mortality of infants with congenital diaphragmatic hernia.

Methods: A single-center chart review of all patients treated with congenital diaphragmatic hernia over a period of 16 years, at the Medical University of Vienna, was performed.

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Objectives: The prediction of patient responses to potentially painful stimuli remains a challenge in PICUs. We investigated the ability of the paintracker analgesia monitor (Dolosys GmbH, Berlin, Germany) measuring the nociceptive flexion reflex threshold, the cerebral sedation monitor bispectral index (Medtronic, Dublin, Ireland), the COMFORT Behavior, and the modified Face, Legs, Activity, Cry, Consolability Scale scores to predict patient responses following a noxious stimulus.

Design: Single-center prospective exploratory observational study.

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Background: Medical-imaging-based three-dimensional (3D) printed models enable improvement in skills training, surgical planning, and decision-making. This pilot study aimed to use multimodality imaging and to add and compare 3D ultrasound as a future standard to develop realistic neonatal brain models including the ventricular system.

Methods: Retrospective computed tomography (CT), magnetic resonance imaging (MRI), and 3D ultrasound-based brain imaging protocols of five neonatal patients were analyzed and subsequently segmented with the aim of developing a multimodality imaging-based 3D printed model.

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EEG monitoring of early brain function and development in neonatal intensive care units may help to identify infants with high risk of serious neurological impairment and to assess brain maturation for evaluation of neurodevelopmental progress. Automated analysis of EEG data makes continuous evaluation of brain activity fast and accessible. A convolutional neural network (CNN) for regression of EEG maturational age of premature neonates from marginally preprocessed serial EEG recordings is proposed.

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Background: Providing optimal pain relief is a challenging task when caring for premature infants. The aim of this study was to compare the long-term cognitive, motor, and behavioral outcomes of preterm infants before and after the implementation of a pain and sedation protocol. In addition, we investigated whether the increased opiate administration resulting after the implementation process had an impact on these outcomes.

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Objectives: To evaluate if "mirrored ribs"-a mirroring of chest structures-is a sign for pneumothorax in lung ultrasound in neonates.

Design: Retrospective study.

Setting: Medical University Vienna/General Hospital, Vienna, Austria.

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Importance: Because children in a preverbal stage of development are unable to voice their feelings, they completely depend on their caregiving team for the interpretation and management of their pain and discomfort. Thus, accurately validated scales to assess pain and sedation levels are crucial.

Objective: To provide clinicians a complete overview on the validity and reliability of the existing pain and sedation scales for different target populations (preterm infants, term infants, and toddlers) and in different clinical contexts.

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Article Synopsis
  • - The study investigates the differences between invasive blood pressure (IBP) and non-invasive blood pressure (NBP) readings in extremely preterm infants during their first month of life, focusing on how closely the two methods correlate.
  • - An analysis of 335 pairs of readings revealed strong correlations but also significant biases: NBP readings tended to overestimate systolic pressure and underestimate diastolic pressure in specific gestational age groups.
  • - The findings suggest that discrepancies between IBP and NBP exist early in life and vary based on blood pressure ranges, highlighting the importance of using both methods together to avoid potential treatment issues.
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