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Boeker M, Zöller D, Blasini R, Macho P, Helfer S, Behrens M, Prokosch HU, Gulden C. Effectiveness of IT-supported patient recruitment: study protocol for an interrupted time series study at ten German university hospitals. Trials 2024; 25:125. [PMID: 38365848 PMCID: PMC10870691 DOI: 10.1186/s13063-024-07918-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 01/09/2024] [Indexed: 02/18/2024] Open
Abstract
BACKGROUND As part of the German Medical Informatics Initiative, the MIRACUM project establishes data integration centers across ten German university hospitals. The embedded MIRACUM Use Case "Alerting in Care - IT Support for Patient Recruitment", aims to support the recruitment into clinical trials by automatically querying the repositories for patients satisfying eligibility criteria and presenting them as screening candidates. The objective of this study is to investigate whether the developed recruitment tool has a positive effect on study recruitment within a multi-center environment by increasing the number of participants. Its secondary objective is the measurement of organizational burden and user satisfaction of the provided IT solution. METHODS The study uses an Interrupted Time Series Design with a duration of 15 months. All trials start in the control phase of randomized length with regular recruitment and change to the intervention phase with additional IT support. The intervention consists of the application of a recruitment-support system which uses patient data collected in general care for screening according to specific criteria. The inclusion and exclusion criteria of all selected trials are translated into a machine-readable format using the OHDSI ATLAS tool. All patient data from the data integration centers is regularly checked against these criteria. The primary outcome is the number of participants recruited per trial and week standardized by the targeted number of participants per week and the expected recruitment duration of the specific trial. Secondary outcomes are usability, usefulness, and efficacy of the recruitment support. Sample size calculation based on simple parallel group assumption can demonstrate an effect size of d=0.57 on a significance level of 5% and a power of 80% with a total number of 100 trials (10 per site). Data describing the included trials and the recruitment process is collected at each site. The primary analysis will be conducted using linear mixed models with the actual recruitment number per week and trial standardized by the expected recruitment number per week and trial as the dependent variable. DISCUSSION The application of an IT-supported recruitment solution developed in the MIRACUM consortium leads to an increased number of recruited participants in studies at German university hospitals. It supports employees engaged in the recruitment of trial participants and is easy to integrate in their daily work.
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Affiliation(s)
- Martin Boeker
- Institute of Medical Biometry and Statistics, Medical Faculty and Medical Center, University of Freiburg, Freiburg im Breisgau, Germany
- Chair of Medical Informatics, Institute of Artificial Intelligence and Informatics in Medicine, Klinikum rechts der Isar, School of Medicine and Health, Technical University of Munich, Munich, Germany
| | - Daniela Zöller
- Institute of Medical Biometry and Statistics, Medical Faculty and Medical Center, University of Freiburg, Freiburg im Breisgau, Germany
| | - Romina Blasini
- Institute of Medical Informatics, Justus-Liebig-University Gießen, Gießen, Germany
| | - Philipp Macho
- Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), Mainz University Medical Center, Mainz, Germany
| | - Sven Helfer
- Department of Pediatrics, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Max Behrens
- Institute of Medical Biometry and Statistics, Medical Faculty and Medical Center, University of Freiburg, Freiburg im Breisgau, Germany
| | - Hans-Ulrich Prokosch
- Chair of Medical Informatics, Department of Medical Informatics, Biometrics and Epidemiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Gulden
- Chair of Medical Informatics, Department of Medical Informatics, Biometrics and Epidemiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
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Hense H, Mathiebe J, Helfer S, Glaubitz R, Rüdiger M, Birdir C, Schmitt J, Müller G. Evaluation of the telemedical health care network "SAFE BIRTH" for pregnant women at risk, premature and sick newborns and their families: study protocol of a cluster-randomized controlled stepped-wedge trial. BMC Health Serv Res 2024; 24:200. [PMID: 38355579 PMCID: PMC10865646 DOI: 10.1186/s12913-024-10667-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 01/31/2024] [Indexed: 02/16/2024] Open
Abstract
BACKGROUND The Perinatal Center of the University Hospital Carl Gustav Carus Dresden has initiated the telemedical healthcare network "SAFE BIRTH" to coordinate and improve specialized care in non-metropolitan regions for pregnant women and newborns. The network incorporates five intervention bundles (IB): (1) Multi-professional, inter-disciplinary prenatal care plan; (2) Neonatal resuscitation; (3) Neonatal antibiotic stewardship; (4) Inter-facility transfer of premature and sick newborns; (5) Psycho-social support for parents. We evaluate if the network improves care close to home for pregnant women, premature and sick newborns. METHODS To evaluate the complex healthcare intervention "SAFE BIRTH" we will conduct a cluster-randomized controlled stepped-wedge trial in five prenatal medical outpatient offices and eight non-metropolitan hospitals in Saxony, Germany. The offices and hospitals will be randomly allocated to five respectively eight sequential steps over a 30-month period to implement the telemedical IB. We define one specific primary process outcome for each IB (for instance IB#1: "Proportion of patients with inclusion criterion IB#1 who have a prenatal care plan and psychosocial counseling within one week"). We estimated a separate multilevel logistic regression model for each primary process outcome using the intervention status as a regressor (control or intervention group). Across all IB, a total of 1,541 and 1,417 pregnant women or newborns need to be included in the intervention and control group, respectively, for a power above 80% for small to medium intervention effects for all five hypothesis tests. Additionally, we will assess job satisfaction and sense of safety of health professionals caring for newborns (questionnaire survey) and we will assess families' satisfaction, resilience, quality of life and depressive, anxiety and stress symptoms (questionnaire surveys). We will also evaluate the cost-effectiveness of "SAFE BIRTH" (statutory health insurance routine data, process data) and barriers to its implementation (semi-structured interviews). We use multilevel regression models adjusting for relevant confounders (e.g. socioeconomic status, age, place of residence), as well as descriptive analyses and qualitative content analyses. DISCUSSION If the telemedical healthcare network "SAFE BIRTH" proves to be effective and cost-efficient, strategies for its translation into routine care should be developed. TRIAL REGISTRATION German clinical trials register. DRKS-ID DRKS00031482.
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Affiliation(s)
- Helene Hense
- Center for Evidence-Based Healthcare, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
| | - Josephine Mathiebe
- Center for Evidence-Based Healthcare, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Sven Helfer
- Saxony Center for Feto/Neonatal Health, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Rick Glaubitz
- Center for Evidence-Based Healthcare, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Mario Rüdiger
- Saxony Center for Feto/Neonatal Health, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Cahit Birdir
- Saxony Center for Feto/Neonatal Health, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jochen Schmitt
- Center for Evidence-Based Healthcare, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Gabriele Müller
- Center for Evidence-Based Healthcare, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
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Blasini R, Strantz C, Gulden C, Helfer S, Lidke J, Prokosch HU, Sohrabi K, Schneider H. Evaluation of Eligibility Criteria Relevance for the Purpose of IT-Supported Trial Recruitment: Descriptive Quantitative Analysis. JMIR Form Res 2024; 8:e49347. [PMID: 38294862 PMCID: PMC10867759 DOI: 10.2196/49347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 09/28/2023] [Accepted: 11/22/2023] [Indexed: 02/01/2024] Open
Abstract
BACKGROUND Clinical trials (CTs) are crucial for medical research; however, they frequently fall short of the requisite number of participants who meet all eligibility criteria (EC). A clinical trial recruitment support system (CTRSS) is developed to help identify potential participants by performing a search on a specific data pool. The accuracy of the search results is directly related to the quality of the data used for comparison. Data accessibility can present challenges, making it crucial to identify the necessary data for a CTRSS to query. Prior research has examined the data elements frequently used in CT EC but has not evaluated which criteria are actually used to search for participants. Although all EC must be met to enroll a person in a CT, not all criteria have the same importance when searching for potential participants in an existing data pool, such as an electronic health record, because some of the criteria are only relevant at the time of enrollment. OBJECTIVE In this study, we investigated which groups of data elements are relevant in practice for finding suitable participants and whether there are typical elements that are not relevant and can therefore be omitted. METHODS We asked trial experts and CTRSS developers to first categorize the EC of their CTs according to data element groups and then to classify them into 1 of 3 categories: necessary, complementary, and irrelevant. In addition, the experts assessed whether a criterion was documented (on paper or digitally) or whether it was information known only to the treating physicians or patients. RESULTS We reviewed 82 CTs with 1132 unique EC. Of these 1132 EC, 350 (30.9%) were considered necessary, 224 (19.8%) complementary, and 341 (30.1%) total irrelevant. To identify the most relevant data elements, we introduced the data element relevance index (DERI). This describes the percentage of studies in which the corresponding data element occurs and is also classified as necessary or supplementary. We found that the query of "diagnosis" was relevant for finding participants in 79 (96.3%) of the CTs. This group was followed by "date of birth/age" with a DERI of 85.4% (n=70) and "procedure" with a DERI of 35.4% (n=29). CONCLUSIONS The distribution of data element groups in CTs has been heterogeneously described in previous works. Therefore, we recommend identifying the percentage of CTs in which data element groups can be found as a more reliable way to determine the relevance of EC. Only necessary and complementary criteria should be included in this DERI.
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Affiliation(s)
- Romina Blasini
- Institute of Medical Informatics, Justus Liebig University, Giessen, Germany
| | - Cosima Strantz
- Department of Medical Informatics, Biometrics and Epidemiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Gulden
- Department of Medical Informatics, Biometrics and Epidemiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sven Helfer
- Department of Pediatrics, Medical Faculty and University Hospital Carl Gustav Carus, TUD Dresden University of Technology, Dresden, Germany
| | - Jakub Lidke
- Data Integration Center, Medical Faculty, Philipps University of Marburg, Marburg, Germany
| | - Hans-Ulrich Prokosch
- Department of Medical Informatics, Biometrics and Epidemiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Keywan Sohrabi
- Faculty of Health Sciences, Technische Hochschule Mittelhessen University of Applied Sciences, Giessen, Germany
| | - Henning Schneider
- Institute of Medical Informatics, Justus Liebig University, Giessen, Germany
- Faculty of Health Sciences, Technische Hochschule Mittelhessen University of Applied Sciences, Giessen, Germany
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Zoch M, Sedlmayr B, Knapp A, Bathelt F, Helfer S, Schmitt J, Sedlmayr M. [Interdisciplinary care path and potential IT support for people with rare diseases in Germany]. Z Evid Fortbild Qual Gesundhwes 2021; 165:68-76. [PMID: 34483074 DOI: 10.1016/j.zefq.2021.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/04/2021] [Accepted: 06/09/2021] [Indexed: 06/13/2023]
Abstract
INTRODUCTION Due to the high variability and, at the same time, rare occurrence of rare diseases, the diagnosis of these patients (approx. 4 million people in Germany) can turn into an odyssey. The large time interval between the appearance of symptoms and the final diagnosis of the rare disease leads to a delay in the appropriate treatment. The often long period of uncertainty about the cause of symptoms as well as non-specific or even wrong therapies can have negative effects on both the course of disease and the patients' quality of life. For a better understanding of the current care situation and IT landscape, the interdisciplinary care pathway for people with rare diseases will be modelled and the possible uses of IT applications identified that have the potential to improve diagnosis, treatment and therapy of rare diseases. METHODS In order to achieve these goals, an initial care pathway was modelled on the basis of process descriptions which are commonly used in the literature, discussed in detail, and agreed upon in a first workshop with six experts from outpatient and inpatient care as well as employees of Centers for Rare Diseases. In a second workshop, ten experts analyzed the resulting care pathway with regard to the possible use of IT applications, and the identification was agreed upon. The experts included those involved in the process, in particular physicians, patients / patient representatives, health care researchers, and experts in hospital IT, IT security, and data protection. RESULTS The two workshops resulted in process models including the specification of possible uses for IT applications. The most important steps in the care pathway for people with rare diseases in Germany include: neonatal screening, seeking medical advice, outpatient care by general practitioners, outpatient care by specialists, care by specialist outpatient clinic, care by clinic, care by a Center for Rare Diseases: case review and case conference and treatment and therapy. The discussion of the possible uses of IT applications resulted in a focus on registers (e. g. with regard to experts, treatment and therapy options) as well as on digital tools, such as "digital findings and findings platform" and "digital referral with referral tracking". DISCUSSION Our results show that the care pathway is very heterogeneous and complex. Thus, the sub-processes show different variants with many branches and repetitions. They also illustrate that the care for people with rare diseases requires a high level of interdisciplinary collaboration; diagnosis as well as treatment and therapy often take place across sectors and in cooperation between different medical health care institutions and professions. When analyzing the current IT landscape, it becomes clear that IT applications can be used at many process steps in the care for people with rare diseases and have a high potential. Therefore, they must be used to inform decisions about the adequate diagnosis and treatment as well as communication about the clinical pictures and the patient's case between practitioners and medical care sectors. CONCLUSION The interdisciplinary collaboration highlights the need for cooperation between the various parties involved in the process, which requires the identification and implementation of interfaces between the stakeholders and their systems. However, it is not enough to include the view of the processes; the data perspective is also required. Creating interoperability also enables the use of IT applications. The basis for this is the results obtained.
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Affiliation(s)
- Michele Zoch
- Institut für Medizinische Informatik und Biometrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland.
| | - Brita Sedlmayr
- Institut für Medizinische Informatik und Biometrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland; Zentrum für Evidenzbasierte Gesundheitsversorgung, Universitätsklinikum und Medizinische Fakultät Carl Gustav Carus der Technischen Universität Dresden, Dresden, Deutschland
| | - Andreas Knapp
- Zentrum für Evidenzbasierte Gesundheitsversorgung, Universitätsklinikum und Medizinische Fakultät Carl Gustav Carus der Technischen Universität Dresden, Dresden, Deutschland
| | - Franziska Bathelt
- Institut für Medizinische Informatik und Biometrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland
| | - Sven Helfer
- Institut für Medizinische Informatik und Biometrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland
| | - Jochen Schmitt
- Zentrum für Evidenzbasierte Gesundheitsversorgung, Universitätsklinikum und Medizinische Fakultät Carl Gustav Carus der Technischen Universität Dresden, Dresden, Deutschland
| | - Martin Sedlmayr
- Institut für Medizinische Informatik und Biometrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland
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Helfer S, Kümmel M, Bathelt F, Sedlmayr M. Generating Enriched Synthetic German Hospital Claims Data - A Use Case Driven Approach. Stud Health Technol Inform 2021; 278:58-65. [PMID: 34042876 DOI: 10.3233/shti210051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Clinical data and above all individual patient data are highly sensitive. All the more it is important to protect these critical information while analyzing and exploring their specifics for further research. However, in order to enable students and other researchers to develop decision support systems and to use modern data analysis methods such as intelligent pattern recognition, the provision of clinical data is essential. In order to allow this while completely protecting the privacy of a patient, we present a mixed approach to generate semantically and clinically realistic data: (1) We use available synthetic data, extract information on patient visits and diagnoses and adapt them to the encoding systems of German claims data; (2) based on a statistical analysis of real German hospital data, we identify distributions of procedures, laboratory data and other measurements and transfer them to the synthetic patient's visits and diagnoses in a semi-automated way. This enabled us to provide students a data set that is as semantically and clinically realistic as possible to apply patient-level prediction algorithms within the development of clinical decision support systems without putting patient data at any risk.
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Affiliation(s)
- Sven Helfer
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Michéle Kümmel
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Franziska Bathelt
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Martin Sedlmayr
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
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Bathelt F, Kümmel M, Helfer S, Kamann C, Sedlmayr M. Formal Modelling of FHIR Based, Medical Data Exchange Using Algebraic Petri Nets. Stud Health Technol Inform 2020; 270:597-601. [PMID: 32570453 DOI: 10.3233/shti200230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Enabling interoperability is a challenging task in medical data exchange and is often addressed by the use of versatile communication standards like HL7 FHIR. Although daily routine and scientific experiences show its suitability, the use comes with major risks regarding safety and security of data. To overcome these problems, we present an approach to enable a formal verification of medical communication use cases. We identified the Neonatal Screening as a practical example in which two process participants (physician and screening laboratory) are involved. We analyzed the FHIR specification as well as identified necessary resources in that context and formally modeled them as algebraic specifications. By that, we were able to represent the participants' behavior and data flow with help of Algebraic Petri Nets. This strategy allows to formally verify the correctness of a system by specified requirements regarding data safety and data security.
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Affiliation(s)
- Franziska Bathelt
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden
| | - Michéle Kümmel
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden
| | - Sven Helfer
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden
| | - Christian Kamann
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden
| | - Martin Sedlmayr
- Institute for Medical Informatics and Biometry, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden
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Weschenfelder F, Helfer S, Groten T, Schleußner E, Beyer J. Fetales Heterotaxiesyndrom bei Patientin mit Typ 1 Diabetes mellitus, instabiler Persönlichkeitsstörung und schwieriger Sozialanamnese – eine Fallvorstellung. Z Geburtshilfe Neonatol 2015. [DOI: 10.1055/s-0035-1566545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Schneider U, Weschenfelder F, Kiefer A, Helfer S, Dawczynski K, Proquittè H, Schleußner E. Fetale Hypoxisch-Ischämische Hirnschädigung nach mütterlichem Herzkreislaufstillstand und kardiopulmonaler Reanimation bei fulminanter Lungenembolie. Z Geburtshilfe Neonatol 2015. [DOI: 10.1055/s-0035-1566549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Weschenfelder F, Helfer S, Battefeld W, Beyer J. Fallvorstellung – Fetales Heterotaxiesyndrom bei Patientin mit Typ 1 Diabetes mellitus, instabiler Persönlichkeitsstörung und schwieriger Sozialanamnese. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1551582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Helfer S, Schmitz L, Bührer C, Czernik C. Tissue Doppler-Derived Strain and Strain Rate during the First 28 Days of Life in Very Low Birth Weight Infants. Echocardiography 2013; 31:765-72. [DOI: 10.1111/echo.12463] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Sven Helfer
- Department of Pediatric Cardiology; Charité University Medical Center; Berlin Germany
| | - Lothar Schmitz
- Department of Pediatric Cardiology; Charité University Medical Center; Berlin Germany
| | - Christoph Bührer
- Department of Neonatology; Charité University Medical Center; Berlin Germany
| | - Christoph Czernik
- Department of Neonatology; Charité University Medical Center; Berlin Germany
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Czernik C, Rhode S, Helfer S, Schmalisch G, Bührer C. Left ventricular longitudinal strain and strain rate measured by 2-D speckle tracking echocardiography in neonates during whole-body hypothermia. Ultrasound Med Biol 2013; 39:1343-1349. [PMID: 23743104 DOI: 10.1016/j.ultrasmedbio.2013.03.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 03/12/2013] [Accepted: 03/20/2013] [Indexed: 06/02/2023]
Abstract
The purpose of the study was to assess changes in cardiac performance in newborn infants with hypoxic-ischemic encephalopathy during therapeutic hypothermia and rewarming with two-dimensional speckle tracking echocardiography. For eight asphyxiated neonates (median birth weight (range): 3038 (2725-3253) g; umbilical artery pH: 6.9 (6.8-7.18) undergoing whole-body hypothermia (33-34°C), left ventricular longitudinal strain and strain rate, as well as heart rate, cardiac output and left ventricular fractional shortening, were determined at four points in time: the start (T1) and end of hypothermia (T2), immediately after rewarming (T3) and the age of 5 to 7 d (T4). Mean (standard deviation) heart rate increased from 93 (12) beats/min at T1 to 133 (12) beats/min at T4 (p < 0.001). Cardiac output was low during hypothermia (T1: 207 [43] mL/kg/min, T2: 240 [70] mL/kg/min) and increased significantly (p < 0.001) afterward (T3: 329 [70] mL/kg/min, T4: 388 [78] mL/kg/min). Left ventricular fractional shortening remained unchanged. Left ventricular global longitudinal peak systolic strain did not differ significantly between hypothermia and rewarming, whereas the systolic strain rate increased from -1.1 (0.3) s(-1) at T1 to -1.8 (0.26) s(-1) at T4 (p = 0.001). Hypothermia affects peak systolic strain rate, heart rate and cardiac output, with complete recovery after rewarming, whereas peak systolic strain and fractional shortening remain stable.
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Affiliation(s)
- Christoph Czernik
- Department of Neonatology, Charité University Medical Center, Berlin, Germany.
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Helfer S, Schmitz L, Bührer C, Czernik C. Reproducibility and Optimization of Analysis Parameters of Tissue Doppler-Derived Strain and Strain Rate Measurements for Very Low Birth Weight Infants. Echocardiography 2013; 30:1219-26. [DOI: 10.1111/echo.12273] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Sven Helfer
- Department of Pediatric Cardiology; Charité University Medical Center; Berlin Germany
| | - Lothar Schmitz
- Department of Pediatric Cardiology; Charité University Medical Center; Berlin Germany
| | - Christoph Bührer
- Department of Neonatology; Charité University Medical Center; Berlin Germany
| | - Christoph Czernik
- Department of Neonatology; Charité University Medical Center; Berlin Germany
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Ochs M, Hager D, Helfer S, Lothenbach B. Solubility of Radionuclides in Fresh and Leached Cementitious Systems at 22°C and 50°C. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-506-773] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThe solubility of Ni, Sn, Pb, Eu, and Sr was investigated at 22°C and 50°C in simulated cement porewaters corresponding to fresh cement (‘FPW’, pH 13.2) and cement leached of soluble alkalis, whose porewater chemistry is dominated by equilibrium with portlandite (‘APW’, pH 12.5). Solubility limits were approached from undersaturation, using Ni(OH)2(c), SnO2(c) (cassiterite), PbO(red), and Eu(OH)3(c) as solids. For Sr, no solubility experiments were carried out since the cement contains enough Sr to reach equilibrium with strontianite and celestite. Solubilities generally increase with increasing pH and temperature. The measured solubility of Pb ranges from about 4× 10−3 to 1×1O−2M and is within thermodynamically predicted values. The measured solubility of Ni is <O.5-1.3×10−7M in APW and about 3-4×10−7M in FPW, which is lower than predicted by most thermodynamic data. The measured solubility of Eu ranges from <6.6×10−10M in APW to 1.8-2.7×10−9M in FPW, which agrees well with thermodynamic calculations. The solubility of cassiterite is low, with dissolved Sn concentrations ranging from 3.5× 10−8M in APW to 3.3× 10−6M in FPW. Thermodynamic calculations predict much higher solubilities, presumably for less crystalline phases. However, oversaturation measurements in APW reproduced the solubility limits obtained by undersaturation within a factor of two. To our knowledge, no relevant thermodynamic data are available.
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Kubota H, Camilleri L, Legault B, Miguel B, El Youssoufi AT, Bailly P, Brazzalotto I, Helfer S, Lusson JR, de Riberolles C. Surgical correction of the hypoplastic aortic arch by the subclavian free flap method in the neonate. J Thorac Cardiovasc Surg 1998; 116:519-21. [PMID: 9731796 DOI: 10.1016/s0022-5223(98)70020-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- H Kubota
- Department of Cardiovascular Surgery, University of Clermont-Ferrand, France
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Corbe C, Helfer S, Resnikoff S. [Bietti's keratitis in the Republic of Djibouti]. Bull Soc Ophtalmol Fr 1980; 80:1271-3. [PMID: 6971183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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