Full Text Journal Articles by
Author Andreas D Waldmann

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Prolonged Continuous Monitoring of Regional Lung Function in Infants with Respiratory Failure.

Tobias H Becher, Martijn Miedema, Merja Kallio, Thalia Papadouri, Christina Karaoli, Louiza Sophocleous, Marika Rahtu, Ruud W van Leuteren, Andreas D Waldmann, Claas Strodthoff, Rebecca Yerworth, Antoine Dupré, Mohamed-Rida Benissa, Sven Nordebo, Davood Khodadad, Richard Bayford, Roseanne Vliegenthart, Peter C Rimensberger, Anton H van Kaam, Inéz Frerichs,

Electrical impedance tomography (EIT) allows instantaneous and continuous visualization of regional ventilation and changes in end-expiratory lung volume at the bedside. There is particular interest in using EIT for monitoring in critically ill neonates and young children with respiratory failure. Previous studies have focused only on short-term monitoring in small ... Read more >>

Ann Am Thorac Soc (Annals of the American Thoracic Society)
[2021, :]

Cited: 0 times

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Exercise-induced airflow changes in horses with asthma measured by electrical impedance tomography.

Nicolas Herteman, Martina Mosing, Andreas D Waldmann, Vinzenz Gerber, Angelika Schoster,

<h4>Background</h4>Equine asthma (EA) causes airflow impairment, which increases in severity with exercise. Electrical impedance tomography (EIT) is an imaging technique that can detect airflow changes in standing healthy horses during a histamine provocation test.<h4>Objectives</h4>To explore EIT-calculated flow variables before and after exercise in healthy horses and horses with mild-to-moderate (MEA) ... Read more >>

J Vet Intern Med (Journal of veterinary internal medicine)
[2021, 35(5):2500-2510]

Cited: 1 time

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The DELUX study: development of lung volumes during extubation of preterm infants.

Leonie Plastina, Vincent D Gaertner, Andreas D Waldmann, Janine Thomann, Dirk Bassler, Christoph M Rüegger,

<h4>Objective</h4>To measure changes in end-expiratory lung impedance (EELI) as a marker of functional residual capacity (FRC) during the entire extubation procedure of very preterm infants.<h4>Methods</h4>Prospective observational study in preterm infants born at 26-32 weeks gestation being extubated to non-invasive respiratory support. Changes in EELI and cardiorespiratory parameters (heart rate, oxygen ... Read more >>

Pediatr Res (Pediatric research)
[2021, :]

Cited: 0 times

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Imaging the Respiratory Transition at Birth: Unraveling the Complexities of the First Breaths of Life.

David G Tingay, Olivia Farrell, Jessica Thomson, Elizabeth J Perkins, Prue M Pereira-Fantini, Andreas D Waldmann, Christoph Rüegger, Andy Adler, Peter G Davis, Inéz Frerichs,

<b>Rationale:</b> The transition to air breathing at birth is a seminal respiratory event common to all humans, but the intrathoracic processes remain poorly understood. <b>Objectives:</b> The objectives of this prospective, observational study were to describe the spatiotemporal gas flow, aeration, and ventilation patterns within the lung in term neonates undergoing ... Read more >>

Am J Respir Crit Care Med (American journal of respiratory and critical care medicine)
[2021, 204(1):82-91]

Cited: 6 times

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Calculation of Transpulmonary Pressure From Regional Ventilation Displayed by Electrical Impedance Tomography in Acute Respiratory Distress Syndrome.

Gaetano Scaramuzzo, Savino Spadaro, Elena Spinelli, Andreas D Waldmann, Stephan H Bohm, Irene Ottaviani, Federica Montanaro, Lorenzo Gamberini, Elisabetta Marangoni, Tommaso Mauri, Carlo Alberto Volta,

Transpulmonary driving pressure (DP<sub>L</sub>) corresponds to the cyclical stress imposed on the lung parenchyma during tidal breathing and, therefore, can be used to assess the risk of ventilator-induced lung injury (VILI). Its measurement at the bedside requires the use of esophageal pressure (Peso), which is sometimes technically challenging. Recently, it ... Read more >>

Front Physiol (Frontiers in physiology)
[2021, 12:693736]

Cited: 0 times

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Use of Electrical Impedance Tomography (EIT) to Estimate Tidal Volume in Anaesthetized Horses Undergoing Elective Surgery.

Benedetta Crivellari, Anthea Raisis, Giselle Hosgood, Andreas D Waldmann, David Murphy, Martina Mosing,

This study explores the application of electric impedance tomography (EIT) to estimate tidal volume (VT) by measuring impedance change per breath (∆Z<sub>breath</sub>). Seventeen healthy horses were anaesthetised and mechanically ventilated for elective procedures requiring dorsal recumbency. Spirometric VT (VT<sub>SPIRO</sub>) and ∆Z<sub>breath</sub> were recorded periodically; up to six times throughout anaesthesia. ... Read more >>

Animals (Basel) (Animals : an open access journal from MDPI)
[2021, 11(5):]

Cited: 0 times

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Transmission of Oscillatory Volumes into the Preterm Lung during Noninvasive High-Frequency Ventilation.

Vincent D Gaertner, Andreas D Waldmann, Peter G Davis, Dirk Bassler, Laila Springer, Jessica Thomson, David G Tingay, Christoph M Rüegger,

<b>Rationale:</b> There is increasing evidence for a clinical benefit of noninvasive high-frequency oscillatory ventilation (nHFOV) in preterm infants. However, it is still unknown whether the generated oscillations are effectively transmitted to the alveoli.<b>Objectives:</b> To assess magnitude and regional distribution of oscillatory volumes (V<sub>Osc</sub>) at the lung level.<b>Methods:</b> In 30 prone ... Read more >>

Am J Respir Crit Care Med (American journal of respiratory and critical care medicine)
[2021, 203(8):998-1005]

Cited: 3 times

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What hinders pulmonary gas exchange and changes distribution of ventilation in immobilized white rhinoceroses (Ceratotherium simum) in lateral recumbency?

Martina Mosing, Andreas D Waldmann, Muriel Sacks, Peter Buss, Jordyn M Boesch, Gareth E Zeiler, Giselle Hosgood, Robin D Gleed, Michele Miller, Leith C R Meyer, Stephan H Böhm,

This study used electrical impedance tomography (EIT) measurements of regional ventilation and perfusion to elucidate the reasons for severe gas exchange impairment reported in rhinoceroses during opioid-induced immobilization. EIT values were compared with standard monitoring parameters to establish a new monitoring tool for conservational immobilization and future treatment options. Six ... Read more >>

J Appl Physiol (1985) (Journal of applied physiology (Bethesda, Md. : 1985))
[2020, 129(5):1140-1149]

Cited: 2 times

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Personalized Positive End-Expiratory Pressure in Acute Respiratory Distress Syndrome: Comparison Between Optimal Distribution of Regional Ventilation and Positive Transpulmonary Pressure.

Gaetano Scaramuzzo, Savino Spadaro, Francesca Dalla Corte, Andreas D Waldmann, Stephan H Böhm, Riccardo Ragazzi, Elisabetta Marangoni, Giacomo Grasselli, Antonio Pesenti, Carlo Alberto Volta, Tommaso Mauri,

<h4>Objectives</h4>Different techniques exist to select personalized positive end-expiratory pressure in patients affected by the acute respiratory distress syndrome. The positive end-expiratory transpulmonary pressure strategy aims to counteract dorsal lung collapse, whereas electrical impedance tomography could guide positive end-expiratory pressure selection based on optimal homogeneity of ventilation distribution. We compared the ... Read more >>

Crit Care Med (Critical care medicine)
[2020, 48(8):1148-1156]

Cited: 9 times

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Positive End-expiratory Pressure and Distribution of Ventilation in Pneumoperitoneum Combined with Steep Trendelenburg Position.

Atsuko Shono, Nozomi Katayama, Tatsuya Fujihara, Stephan H Böhm, Andreas D Waldmann, Kei Ugata, Tetsuro Nikai, Yoji Saito,

BACKGROUND:Pneumoperitoneum and a steep Trendelenburg position during robot-assisted laparoscopic prostatectomy have been demonstrated to promote a cranial shift of the diaphragm and the formation of atelectasis in the dorsal parts of the lungs. However, neither an impact of higher positive end-expiratory pressure (PEEP) on preserving the ventilation in the dorsal ... Read more >>

Anesthesiology (Anesthesiology)
[2020, 132(3):476-490]

Cited: 2 times

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Evaluation of histamine-provoked changes in airflow using electrical impedance tomography in horses.

Cristy Secombe, Andreas D Waldmann, Giselle Hosgood, Martina Mosing,

<h4>Background</h4>Electrical impedance tomography (EIT) generates thoracic impedance images of the lungs and has been used to assess ventilation in horses. This technique may have application in the detection of changes in airflow associated with equine asthma.<h4>Objectives</h4>The objective was to determine if histamine-induced airflow changes observed with flowmetric plethysmography (Δflow) could also ... Read more >>

Equine Vet J (Equine veterinary journal)
[2020, 52(4):556-563]

Cited: 4 times

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Early Recognition of Pneumothorax in Neonatal Respiratory Distress Syndrome with Electrical Impedance Tomography.

Marika Rahtu, Inéz Frerichs, Andreas D Waldmann, Claas Strodthoff, Tobias Becher, Richard Bayford, Merja Kallio,

Am J Respir Crit Care Med (American journal of respiratory and critical care medicine)
[2019, 200(8):1060-1061]

Cited: 5 times

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Initial Observations on the Effect of Repeated Surfactant Dose on Lung Volume and Ventilation in Neonatal Respiratory Distress Syndrome.

Merja Kallio, Anne-Sea van der Zwaag, Andreas D Waldmann, Marika Rahtu, Martijn Miedema, Thalia Papadouri, Anton H van Kaam, Peter C Rimensberger, Richard Bayford, Inéz Frerichs,

BACKGROUND:Exogenous surfactant administration is an essential part of respiratory distress syndrome treatment in preterm infants. Current guidelines recommend the first dose to be given as early as possible, followed by an additional dose if symptoms persist. The effect of additional dosing on regional ventilation and lung volume has not been ... Read more >>

Neonatology (Neonatology)
[2019, 116(4):385-389]

Cited: 2 times

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Thoracic EIT in 3D: experiences and recommendations.

Bartłomiej Grychtol, Johannes Peter Schramel, Fabian Braun, Thomas Riedel, Ulrike Auer, Martina Mosing, Christina Braun, Andreas D Waldmann, Stephan H Böhm, Andy Adler,

<h4>Objective</h4>In EIT applications to the thorax, a single electrode plane has typically been used to reconstruct a transverse 2D 'slice'. However, such images can be misleading as EIT is sensitive to contrasts above and below the electrode plane, and ventilation and aeration inhomogeneities can be distributed in complex ways. Using ... Read more >>

Physiol Meas (Physiological measurement)
[2019, 40(7):074006]

Cited: 4 times

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Electrical Impedance Tomography Can Identify Ventilation and Perfusion Defects: A Neonatal Case.

David G Tingay, Andreas D Waldmann, Inéz Frerichs, Sarath Ranganathan, Andy Adler,

Am J Respir Crit Care Med (American journal of respiratory and critical care medicine)
[2019, 199(3):384-386]

Cited: 5 times

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Heterogeneity of regional inflection points from pressure-volume curves assessed by electrical impedance tomography.

Gaetano Scaramuzzo, Savino Spadaro, Andreas D Waldmann, Stephan H Böhm, Riccardo Ragazzi, Elisabetta Marangoni, Valentina Alvisi, Elena Spinelli, Tommaso Mauri, Carlo Alberto Volta,

<h4>Background</h4>The pressure-volume (P-V) curve has been suggested as a bedside tool to set mechanical ventilation; however, it reflects a global behavior of the lung without giving information on the regional mechanical properties. Regional P-V (PVr) curves derived from electrical impedance tomography (EIT) could provide valuable clinical information at bedside, being ... Read more >>

Crit Care (Critical care (London, England))
[2019, 23(1):119]

Cited: 9 times

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Effects of positive end-expiratory pressure strategy in supine and prone position on lung and chest wall mechanics in acute respiratory distress syndrome.

Mehdi Mezidi, Francisco José Parrilla, Hodane Yonis, Zakaria Riad, Stephan H Böhm, Andreas D Waldmann, Jean-Christophe Richard, Floriane Lissonde, Romain Tapponnier, Loredana Baboi, Jordi Mancebo, Claude Guérin,

<h4>Background</h4>In acute respiratory distress syndrome (ARDS) patients, it has recently been proposed to set positive end-expiratory pressure (PEEP) by targeting end-expiratory transpulmonary pressure. This approach, which relies on the measurement of absolute esophageal pressure (Pes), has been used in supine position (SP) and has not been investigated in prone position ... Read more >>

Ann Intensive Care (Annals of intensive care)
[2018, 8(1):86]

Cited: 7 times

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Regional expiratory time constants in severe respiratory failure estimated by electrical impedance tomography: a feasibility study.

Christian Karagiannidis, Andreas D Waldmann, Péter L Róka, Tina Schreiber, Stephan Strassmann, Wolfram Windisch, Stephan H Böhm,

<h4>Background</h4>Electrical impedance tomography (EIT) has been used to guide mechanical ventilation in ICU patients with lung collapse. Its use in patients with obstructive pulmonary diseases has been rare since obstructions could not be monitored on a regional level at the bedside. The current study therefore determines breath-by-breath regional expiratory time ... Read more >>

Crit Care (Critical care (London, England))
[2018, 22(1):221]

Cited: 13 times

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Variation of poorly ventilated lung units (silent spaces) measured by electrical impedance tomography to dynamically assess recruitment.

Savino Spadaro, Tommaso Mauri, Stephan H Böhm, Gaetano Scaramuzzo, Cecilia Turrini, Andreas D Waldmann, Riccardo Ragazzi, Antonio Pesenti, Carlo Alberto Volta,

<h4>Background</h4>Assessing alveolar recruitment at different positive end-expiratory pressure (PEEP) levels is a major clinical and research interest because protective ventilation implies opening the lung without inducing overdistention. The pressure-volume (P-V) curve is a validated method of assessing recruitment but reflects global characteristics, and changes at the regional level may remain ... Read more >>

Crit Care (Critical care (London, England))
[2018, 22(1):26]

Cited: 26 times

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Lung Recruitment Strategies During High Frequency Oscillatory Ventilation in Preterm Lambs.

Martijn Miedema, Karen E McCall, Elizabeth J Perkins, Regina B Oakley, Prue M Pereira-Fantini, Anushi E Rajapaksa, Andreas D Waldmann, David G Tingay, Anton H van Kaam,

Background: High frequency oscillatory ventilation (HFOV) is considered a lung protective ventilation mode in preterm infants only if lung volume is optimized. However, whilst a "high lung volume strategy" is advocated for HFOV in preterm infants this strategy is not precisely defined. It is not known to what extent lung ... Read more >>

Front Pediatr (Frontiers in pediatrics)
[2018, 6:436]

Cited: 1 time

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Postural lung recruitment assessed by lung ultrasound in mechanically ventilated children.

Gerardo Tusman, Cecilia M Acosta, Stephan H Böhm, Andreas D Waldmann, Carlos Ferrando, Manuel Perez Marquez, Fernando Suarez Sipmann,

BACKGROUND:Atelectasis is a common finding in mechanically ventilated children with healthy lungs. This lung collapse cannot be overcome using standard levels of positive end-expiratory pressure (PEEP) and thus for only individualized lung recruitment maneuvers lead to satisfactory therapeutic results. In this short communication, we demonstrate by lung ultrasound images (LUS) ... Read more >>

Crit Ultrasound J (Critical ultrasound journal)
[2017, 9(1):22]

Cited: 3 times

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Regional ventilation distribution and dead space in anaesthetized horses treated with and without continuous positive airway pressure: novel insights by electrical impedance tomography and volumetric capnography.

Martina Mosing, Ulrike Auer, Paul MacFarlane, David Bardell, Johannes P Schramel, Stephan H Böhm, Regula Bettschart-Wolfensberger, Andreas D Waldmann,

The aim of this study was to evaluate the effect of continuous positive airway pressure (CPAP) on regional distribution of ventilation and dead space in anaesthetized horses.Randomized, experimental, crossover study.A total of eight healthy adult horses.Horses were anaesthetized twice with isoflurane in 50% oxygen and medetomidine as continuous infusion in ... Read more >>

Vet Anaesth Analg (Veterinary anaesthesia and analgesia)
[2018, 45(1):31-40]

Cited: 5 times

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Time to lung aeration during a sustained inflation at birth is influenced by gestation in lambs.

Karen E McCall, Andreas D Waldmann, Prue Pereira-Fantini, Regina Oakley, Martijn Miedema, Elizabeth J Perkins, Peter G Davis, Peter A Dargaville, Stephan H Böhm, Raffaele Dellacà, Magdy Sourial, Emanuela Zannin, Anushi E Rajapaksa, Andre Tan, Andy Adler, Inéz Frerichs, David G Tingay,

BackgroundCurrent sustained lung inflation (SI) approaches use uniform pressures and durations. We hypothesized that gestational-age-related mechanical and developmental differences would affect the time required to achieve optimal lung aeration, and resultant lung volumes, during SI delivery at birth in lambs.Methods49 lambs, in five cohorts between 118 and 139 days of ... Read more >>

Pediatr Res (Pediatric research)
[2017, 82(4):712-720]

Cited: 5 times

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Bedside Breath-Wise Visualization of Bronchospasm by Electrical Impedance Tomography Could Improve Perioperative Patient Safety: A Case Report.

Pedro de la Oliva, Andreas D Waldmann, Stephan H Böhm, Cristina Verdú-Sánchez, Antonio Pérez-Ferrer, Elena Alvarez-Rojas,

Bronchospasm appears in up to 4% of patients with obstructive lung disease or respiratory infection undergoing general anesthesia. Clinical examination alone may miss bronchospasm. As a consequence, subsequent (mis)treatment and ventilator settings could lead to pulmonary hyperinflation, hypoxia, hypercapnia, hypotension, patient-ventilator asynchrony, volutrauma, or barotrauma. Electrical impedance tomography (EIT), a ... Read more >>

A A Case Rep (A & A case reports)
[2017, 8(12):316-319]

Cited: 4 times

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Ventilatory incidents monitored by electrical impedance tomography in an anaesthetized orangutan (Pongo abelii).

Martina Mosing, Muriel Sacks, Stamatios A Tahas, Elisabeth Ranninger, Stephan H Böhm, Ivo Campagnia, Andreas D Waldmann,

Vet Anaesth Analg (Veterinary anaesthesia and analgesia)
[2017, 44(4):973-976]

Cited: 0 times

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