Publications by authors named "Ruediger von Kries"

5 Publications

  • Page 1 of 1

Risk factors in childhood arterial ischaemic stroke: Findings from a population-based study in Germany.

Eur J Paediatr Neurol 2018 May 10;22(3):380-386. Epub 2018 Jan 10.

Department of Paediatric Haemostaseolgy, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Lindwurmstr. 4, 80337, Munich, Germany.

Objective: Acute treatment of childhood arterial ischaemic stroke and prevention strategies for recurrent stroke episodes depend strongly on each child's individual risk profile. The aim of this study is to characterize risk factors for childhood stroke, their occurrence in isolation or combination, and to identify possible common risk factor patterns.

Methods: This population-based study was conducted via ESPED, a surveillance unit for rare paediatric diseases in Germany. Children aged >28days and <18 years with an acute arterial ischaemic stroke occurring between January 2015 and December 2016 were included.

Results: Among 99 reported children with arterial ischaemic stroke, 56 children were male. Male predominance was significant in adolescents from 12 years old onward. Arterial ischaemic stroke was more common in very young children <2 years of age and in adolescence. No risk factor was identified in 27 children. Hypercoagulable states (29%), cardiac disorders (24%), and arteriopathies (21%) were the most common risk factors. Some risk factor categories were more likely to be identified in isolation (i.e. cardiac disorders, prothrombotic abnormalities and chronic head and neck disorders) than others. The number of risk factors (n = 0-4) per patient and risk factor categories did not differ by age.

Conclusion: Although we could not identify common patterns of risk factor combinations, several risk factors occurred more likely in isolation than others. Further research should focus on the impact of isolated presumed childhood stroke risk factors like certain prothrombotic abnormalities, migraine or a patent foramen ovale. With regard to different age groups, stroke mechanisms in male adolescents require particular attention.
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May 2018

Relevance of hospital characteristics as performance indicators for treatment of very-low-birth-weight neonates.

Eur J Public Health 2014 Oct 28;24(5):739-44. Epub 2013 Nov 28.

2 Institute of Social Paediatrics and Adolescent Medicine, Division of Epidemiology, Ludwig-Maximilians-University of Munich, Germany.

Background: Current attempts at centralization of neonatal care in Germany focus on a minimum volume of 30 very-low-birth-weight (VLBW, weighing <1250 g) neonate admissions per year. However, the evidence for a selective referral strategy based on hospital volume is unclear.

Method: A total of 5575 neonates weighing <1250 g treated in 31 hospitals in Bavaria between 2000 and 2011 were analysed using population-based data. The relevance of different hospital characteristics (i.e. hospital volume, bed capacity and teaching status) for explaining individual in-hospital mortality as well as interhospital variation in mortality rates was analysed using multilevel logistic regression analysis.

Results: In a risk-adjusted model, only dichotomized hospital volume (<30 admissions) was significantly associated with higher mortality in VLBW neonates (odds ratio: 1.74; 95% confidence interval: 1.02-2.99). However, the higher mortality risk only applied to neonates with higher Clinical Risk Index for Babies (CRIB) scores. There was considerable heterogeneity in mortality rates between Bavarian hospitals. The median odds ratio for mortality between two neonates treated in a randomly chosen low-performing versus high-performing hospital was 1.62 in the null model (without explanatory variables). Hospital volume only explained 15.1% of interhospital variation in mortality rates after adjustment for case-mix. Other hospital characteristics were of minor relevance. A funnel plot of the standardized mortality ratio against the number of admissions showed that 41% of small-volume hospitals performed better than expected.

Conclusion: A selective referral strategy based solely on hospital volume will fall short of the task of optimal allocation of neonatal care by means of centralization.
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October 2014

Safety and efficacy of a lifestyle intervention for pregnant women to prevent excessive maternal weight gain: a cluster-randomized controlled trial.

BMC Pregnancy Childbirth 2013 Jul 16;13:151. Epub 2013 Jul 16.

Background: Excessive gestational weight gain (GWG) is associated with short- and long-term health problems among mothers and their offspring. There is a strong need for effective intervention strategies targeting excessive GWG to prevent adverse outcomes.

Methods: We performed a cluster-randomized controlled intervention trial in eight gynecological practices evaluating the feasibility and effectiveness of a lifestyle intervention presented to all pregnant women; 250 healthy, pregnant women were recruited for the study. The intervention program consisted of two individually delivered counseling sessions focusing on diet, physical activity, and weight monitoring. The primary outcome was the proportion of pregnant women exceeding weight gain recommendations of the Institute of Medicine (IOM). Secondary outcome variables were maternal weight retention and short-term obstetric and neonatal outcomes.

Results: The intervention resulted in a lower proportion of women exceeding IOM guidelines among women in the intervention group (38%) compared with the control group (60%) (odds ratio (OR): 0.5; 95% confidence interval (CI): 0.3 to 0.9) without prompting an increase in the proportion of pregnancies with suboptimal weight gain (19% vs. 21%). Participants in the intervention group gained significantly less weight than those in the control group. Only 17% of the women in the intervention group showed substantial weight retention of more than 5 kg compared with 31% of those in the control group at month four postpartum (pp) (OR: 0.5; 95% CI: 0.2 to 0.9). There were no significant differences in obstetric and neonatal outcomes.

Conclusions: Lifestyle counseling given to pregnant women reduced the proportion of pregnancies with excessive GWG without increasing suboptimal weight gain, and may exert favorable effects on pp weight retention.

Trial Registration: German Clinical Trials Register DRKS00003801.
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July 2013

How specific are risk factors for headache in adolescents? Results from a cross-sectional study in Germany.

Neuropediatrics 2013 Feb 10;44(1):46-54. Epub 2013 Jan 10.

Institute of Social Paediatrics and Adolescent Medicine, Medical Faculty of Ludwig-Maximilians-University Munich, Munich, Bavaria, Germany.

Background: The identified preventable risk factors for primary headache in adolescents are smoking; consumption of coffee or alcoholic mixed drinks; physical inactivity; muscle pain in the head, neck, or shoulder region; and chronic stress.

Objective: To investigate the interrelation of headache with other health complaints and the specificity of the above-mentioned risk factors for headache in adolescents.

Methods: A total of 1,260 students (grades 10 and 11) filled in questionnaires on headache, dietary, and lifestyle factors. The type of headache and health complaints such as dizziness, abdominal pain, musculoskeletal pains, symptoms of possible fatigue syndrome, and psychic complaints were assessed.

Results: Isolated headache was found in 18% of the headache sufferers; most frequently isolated tension-type headache (78.2%). Only among adolescents with a combination of headache (mainly migraine) and other health complaints, significant associations for almost all analyzed risk factors were found. The strength of the associations with the considered risk factors was very similar in all three analyzed strata except for considerably lower odds ratios for isolated headache.

Conclusion: All analyzed risk factors are nonspecific for headache in adolescents because they also increase the risk for other health complaints. Interventions, therefore, should consider a holistic approach focusing not only on headache but also on a broader spectrum of health complaints.
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February 2013

Incidence and clinical presentation of invasive neonatal group B streptococcal infections in Germany.

Pediatrics 2006 Jun 8;117(6):e1139-45. Epub 2006 May 8.

Department of Pediatrics and Adolescent Medicine, University Hospital Freiburg, Freiburg, Germany.

Objective: Streptococcus agalactiae (group B Streptococcus) is an important cause of morbidity and mortality in newborn infants. So far, there have been no published data on the incidence, morbidity, and mortality of invasive neonatal group B Streptococcus infections in Germany.

Methods: A prospective active surveillance study involving all of the pediatric hospitals, which reported their cases to the German Pediatric Surveillance Unit, and all of the microbiological laboratories serving pediatric hospitals, which reported their cases to the Laboratory Sentinel Group at Robert Koch Institute Berlin, was conducted between 2001 and 2003. Capture-recapture analysis was used to evaluate the completeness of reported neonatal invasive group B Streptococcus infections.

Results: We collected and analyzed data from 347 and 360 infants with invasive group B Streptococcus infection during the first 3 months of life, as reported by pediatricians to the German Pediatric Surveillance Unit and microbiologists to the Robert Koch Institute Berlin, respectively. Using capture-recapture analysis, we calculated an incidence of 0.47 per 1000 live births. Nearly 60% of the infants suffered from early-onset disease, and 16% of these presented with meningitis. In contrast, 61.8% of infants with late-onset disease presented with meningitis. Prematurity was present in 22.4% of early-onset disease and 39.7% of late-onset disease cases, respectively. A high proportion of infants suffered from sequelae because of group B Streptococcus infection at the time of discharge from the hospital. Most common sequelae were hydrocephalus and cerebral seizure. Case fatality rate was 4.3%.

Conclusions: This study, which is the first to provide information on the current national incidence and morbidity of invasive group B Streptococcus infection in Germany, demonstrates remarkable country-specific variation in comparison with other European countries, which gather data in a similar fashion. Therefore, the importance of country-specific prevention guidelines has to be stressed.
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June 2006