Publications by authors named "Christian Knorr"

Background: Even if understanding of neuronal enteropathies, such as Hirschsprung's disease and functional constipation, has been improved, specialized therapies are still missing. Sacral neuromodulation (SNM) has been established in the treatment of defecation disorders in adults. The aim of the study was to investigate effects of SNM in children and adolescents with refractory symptoms of chronic constipation.

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Background: Simple appendicitis may be self-limiting or require antibiotic treatment or appendectomy. The aim of this study was to assess the feasibility and safety of a nonoperative, antibiotic-free approach for suspected simple appendicitis in children.

Methods: This single-center, retrospective study included patients (0-17 years old) who were hospitalized at the pediatric surgery department due to suspected appendicitis between 2011 and 2012.

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Appendicitis is among the most frequent reasons for pediatric abdominal surgeries. Previous decision support systems for appendicitis have focused on clinical, laboratory, scoring, and computed tomography data and have ignored abdominal ultrasound, despite its noninvasive nature and widespread availability. In this work, we present interpretable machine learning models for predicting the diagnosis, management and severity of suspected appendicitis using ultrasound images.

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Article Synopsis
  • The Bado III Monteggia lesion is a rare pediatric fracture that involves the dislocation of the radial head, commonly linked to ulnar fractures.
  • This study analyzed 26 children with this condition to assess the safety and effectiveness of closed reduction treatments, either with or without osteosynthesis.
  • Results showed that most patients had excellent outcomes after treatment, suggesting that proper initial reduction is crucial, and non-invasive methods should be prioritized for managing these fractures.
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Article Synopsis
  • - Anorectal malformations (ARM) are rare developmental issues linked to problems in the embryonic hindgut, often associated with genetic syndromes or other congenital anomalies; about 60% of cases fall into this category.
  • - The study is the largest of its kind, examining the role of copy number variations (CNVs) in ARM by comparing 450 affected individuals with 4,392 healthy controls, using advanced genetic analysis techniques.
  • - Four microscopic chromosomal anomalies and nine submicroscopic CNVs were found, suggesting potential candidate genes (FOXK2, LPP, and SALL3) involved in ARM development, indicating that further research and gene analysis are needed.
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(1) Background: Isolated posterior cruciate ligament (PCL) tears represent a severe type of injury. In hospitals, PCL reconstruction (PCL-R) is less frequently performed than other types of knee surgery. It is unclear whether there is consensus among surgeons on how to perform rehabilitation after PCL-R or if there are different, more individual approaches in daily routines.

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Phototherapy is gaining more attention in the treatment of various diseases. Especially, blue light seems to be a promising approach for wound healing promotion due to its antimicrobial and immune-modulating properties. Despite this, there is only little research focusing on the immune-modulating properties of blue light and its possible effects on wound healing.

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Since early 2020 the COVID-19 pandemic and statutory preventive reorganization of treatment capacities with cancellation of elective surgery as well as curfew regulations led to vastly decreased utilization of primary health care. To assess whether there are negative effects on pediatric acute care in Bavaria during the spring 2020 lockdown a state-wide retrospective multi-center study was performed to analyze the rate of perforated appendicitis during lockdown. Children who have been operated on during the corresponding period in 2018/19 served as control group.

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Given the absence of consolidated and standardized international guidelines for managing pediatric appendicitis and the few strictly data-driven studies in this specific, we investigated the use of machine learning (ML) classifiers for predicting the diagnosis, management and severity of appendicitis in children. Predictive models were developed and validated on a dataset acquired from 430 children and adolescents aged 0-18 years, based on a range of information encompassing history, clinical examination, laboratory parameters, and abdominal ultrasonography. Logistic regression, random forests, and gradient boosting machines were used for predicting the three target variables.

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Introduction: Phototherapy is gaining increased attention in the research and treatment of various diseases. In particular, the use of blue light seems to bear promise, owing to its antimicrobial and immune-modulating properties; however, research focused on the effects of blue light on keratinocytes and reepithelization is rare. In addition, few studies to date have evaluated devices that are used in daily hospital routine.

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Aims: Biodegradable magnesium-based alloy implants represent a promising option in orthopedic surgery, as the clinical outcomes have been reported to be comparable to those of titanium implants and no surgical interventions are required for removal. To date, little is known about the results of the use of these implants in children and adolescents. Therefore, the aim of the present study was to analyze the safety and performance of these implants in children and adolescents.

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Research Question: Is ovarian tissue cryopreservation (OTC) for fertility preservation in prepubertal and adolescent girls safe, and who would benefit most from the procedure?

Design: Survey and retrospective study including patients who had OTC under the age of 18 years in a single centre for fertility preservation. Serum anti-Müllerian hormone levels were measured as a marker for detection of diminished ovarian reserve.

Results: Fifty-three from 102 women participated in the survey (12 deceased, 19 declined, 17 unreachable, 1 palliative).

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A 77-year-old man suffered hypoxemic cardiac arrest by supraglottic and tracheal airway obstruction in the emergency department. A previously unknown cervical fracture had caused a traumatic retropharyngeal-mediastinal hematoma. A lifesaving surgical emergency tracheostomy succeeded.

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Objective: The aim is to analyse a modified standardised HILP procedure regarding the response rates, local recurrences and complication rates.

Patients And Methods: 152 patients (101 females, 51 males) with an average age of 62 years and locoregionally metastasised malignant melanoma underwent HILP using melphalan and dactinomycin between 1992 and 2007. Using M.

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Introduction: The clinical impact of sentinel lymph node biopsy (SLNB) in colon cancer is still controversial. The purpose of this prospective multicenter trial was to evaluate its clinical value to predict the nodal status and identify factors that influence these results.

Methods: Colon cancer patients without prior colorectal surgery or irradiation were eligible.

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