Treatment of Anorectal Malformations in German Hospitals: Analysis of National Hospital Discharge Data from 2016 to 2021

BACKGROUND

 Anorectal malformations (ARMs) are complex congenital anomalies. The corrective operation is demanding and schedulable. Based on complete national data, patterns of care have not been analyzed in Germany yet.

METHODS

 All cases with ARM were analyzed (1) at the time of birth and (2) during the hospital stay for the corrective operation, based on the national hospital discharge data (DRG statistics). Patient's comorbidities, treatment characteristics, hospital structures, and the outcome of corrective operations were analyzed with respect to the hospitals' caseload.

RESULTS

 From 2016 to 2021, 1,726 newborns with ARM were treated at the time of birth in 388 hospitals. Of these hospitals, 19% had neither a pediatric nor a pediatric surgical department. At least one additional congenital anomaly was present in 49% of cases and 7% of the newborns had a birthweight below 1,500 g.In all, 2,060 corrective operations for ARM were performed in 113 hospitals in the same time period. In 24.5% of cases, at least one major complication was documented. One-third of the operations were performed in 56 hospitals, one-third in 20 hospitals, and one-third in 10 hospitals with median annual case numbers of 2, 5, and 10, respectively.Hospitals with the highest caseload operated cloacal defects more often than hospitals with the lowest caseload (7 vs. 2%) and had more early complications than hospitals with the lowest caseload (30 vs. 21%). This difference was not statistically significant after risk adjustment.

CONCLUSIONS

 Children with ARM are multimorbid. Early complications after corrective surgery are common. Considering the large number of hospitals with a very low caseload, centralization of care for the complex and elective corrective surgery for ARM remains a key issue for quality of care.

How did the COVID-19 pandemic affect inpatient care for children in Germany? An exploratory analysis based on national hospital discharge data

BACKGROUND

The delivery of health services around the world faced considerable disruptions during the COVID-19 pandemic. While this has been discussed for a number of conditions in the adult population, related patterns have been studied less for children. In light of the detrimental effects of the pandemic, particularly for children and young people under the age of 18, it is pivotal to explore this issue further.

METHODS

Based on complete national hospital discharge data available via the German National Institute for the Reimbursement of Hospitals (InEK) data browser, we compare the top 30 diagnoses for which children were hospitalised in 2019, 2020, 2021 and 2022. We analyse the development of monthly admissions between January 2019 and December 2022 for three tracers of variable time-sensitivity: acute lymphoblastic leukaemia (ALL), appendicitis/appendectomy and tonsillectomy/adenoidectomy.

RESULTS

Compared to 2019, total admissions were approximately 20% lower in 2020 and 2021, and 13% lower in 2022. The composition of the most frequent principal diagnoses remained similar across years, although changes in rank were observed. Decreases were observed in 2020 for respiratory and gastrointestinal infections, with cases increasing again in 2021. The number of ALL admissions showed an upward trend and a periodicity prima vista unrelated to pandemic factors. Appendicitis admissions decreased by about 9% in 2020 and a further 8% in 2021 and 4% in 2022, while tonsillectomies/adenoidectomies decreased by more than 40% in 2020 and a further 32% in 2021 before increasing in 2022; for these tracers, monthly changes are in line with pandemic waves.

CONCLUSIONS

Hospital care for critical and urgent conditions among patients under the age of 18 was largely upheld in Germany during the COVID-19 pandemic, potentially at the expense of elective treatments. There is an alignment between observed variations in hospitalisations and pandemic mitigation measures, possibly also reflecting changes in demand. This study highlights the need for comprehensive, intersectoral data that would be necessary to better understand changing demand, unmet need/foregone care and shifts from inpatient to outpatient care, as well as their link to patient outcomes and health care efficiency.

Health and Care Data: Approaches to data linkage for evidence-informed policy

An indispensable prerequisite for answering research questions in health services research is the availability and accessibility of comprehensive, high-quality data. It can be assumed that health services research in the coming years will be increasingly based on data linkage, i.e., the linking, or connecting, of several data sources based on suitable common key variables. A range of approaches to data collection, storage, linkage and availability exists across countries, particularly for secondary research purposes (i.e., the use of data initially collected for other purposes), such as health systems research. The main goal of this review is to develop an overview of, and gain insights into, current approaches to linking data sources in the context of health services research, with the view to inform policy, based on existing practices in high-income countries in Europe and beyond. In doing so, another objective is to provide lessons for countries looking for possible or alternative approaches to data linkage. Thirteen country case studies of data linkage approaches were selected and analysed. Rather than being comprehensive, this review aimed to identify varied and potentially useful case studies to showcase different approaches to data linkage worldwide. A conceptual framework was developed to guide the selection and description of case studies. Information was first identified and collected from publicly available sources and a profile was then created for each country and each case study; these profiles were forwarded to appropriate country experts for validation and completion. The report presents an overview of the included countries and their case studies (Chapter 2), with key data per country and case study in the appendices. This is followed by a closer look at the possibilities of using routine data (Chapter 3); the different approaches to linkage (Chapter 4); the different access routes for researchers (Chapter 5); the use of data for research from electronic patient or health records (Chapter 6); foundational considerations related to data safety, privacy and governance (Chapter 7); recent developments in cross-border data sharing and the European Health Data Space (Chapter 8); and considerations of changes and responses catalysed by the COVID-19 pandemic as related to the generation and secondary use of data (Chapter 9). The review ends with overall conclusions on the necessary characteristics of data to inform research relevant for policy and highlights some insights to inspire possible future solutions - less or more disruptive - for countries looking to expand their use of data (Chapter 10). It emphasises that investing in data linkage for secondary use will not only contribute to the strengthening of national health systems, but also promote international cooperation and contribute to the international visibility of scientific excellence.

[Recording Trauma Care in German Hospital Discharge Data: Services Provided by Hospitals Owned by Workers' Compensation Funds and Financed through Statutory Accidental Insurance]

BACKGROUND

In Germany, the Diagnosis-Related Group Statistics (DRG Statistics) represent an almost complete discharge data-based registry of inpatient services in acute care hospitals. However, services of hospitals owned by workers' compensation funds and financed through the statutory insurance for occupational accidents are excluded from the obligation of submitting hospital discharge data. Hence, the DRG statistics might be incomplete regarding inpatient services for trauma care.

METHODS

In order to illustrate trauma and post-trauma care in acute care hospitals, groups of specific inpatient services were defined. Numbers of cases according to these groups were identified in the microdata of the DRG statistics, as well as in the inpatient data of all nine workers' compensation funds hospitals in Germany. By dividing cases financed through the statutory insurance for occupational accidents from cases financed through other payers, the overlap of both databases as well as the share of cases not recorded in the DRG statistics were quantified. The analysis comprised data of 2016-2018.

RESULTS

Depending on the type of service, the share of cases not recorded in the DRG statistics varied between 0.1% and more than 60% (accumulated 2016 to 2018). There was under-recording of early-stage rehabilitation for traumatic brain injury (61%), treatment for traumatic paraplegia (14% for initial treatment and 23% for subsequent treatment), treatment for amputation injury (13%) and treatment for severe hand injury (5%).

CONCLUSION

Regarding inpatient services that are not covered by the statutory insurance for occupational accidents, the microdata of the DRG statistics can be considered as virtually complete. However, inpatient services for trauma care are not completely recorded because discharge data are not submitted by hospitals run by workers' compensation funds when services are financed through the statutory insurance for occupational accidents. Analyses of trauma care can only be complete if data of hospitals financed by workers' compensation funds are included.

[Research Data Center on Health - Vision for Further Development from the Research Perspective]

The German research data center for health will provide claims data of statutory health insurances. The data center was set up at the medical regulatory body BfArM pursuant to the German data transparency regulation (DaTraV). The data provided by the center will cover about 90% of the German population, supporting research on healthcare issues, including questions of care supply, demand and the (mis-)match of both. These data support the development of recommendations for evidence-based healthcare. The legal framework for the center (including §§ 303a-f of Book V of the Social Security Code and two subsequent ordinances) leaves a considerable degree of freedom when it comes to organisational and procedural aspects of the center's operation. The present paper addresses these degrees of freedom. From the point of view of researchers, ten statements show the potential of the data center and provide ideas for its further and sustainable development.

[Methodological Challenges and Lessons Learned in the Scientific Use of Data from a Private Health Insurance Company within the IPHA Project]

The 11% of people with private health insurance (PHI) in Germany have so far been underrepresented in health services research. The scientific use of PHI data is rare. The aim of this research was to examine the scientific usability of PHI data and to highlight challenges and lessons learned in the process of data preparation and analysis using a linked dataset (n=3,109) of survey and claims data of one PHI company. Challenges were identified in the terminology of the PHI insurance, in the processing and validity of the data, and regarding insured persons without submitted billing receipts. With thorough preparation of the data and presentation of the limitations, PHI data can be used for health services research.

What can we learn from the effects of the COVID-19 pandemic on hospital care for children in Germany?

The COVID-19 pandemic created substantial disruptions in the delivery of health services around the world. Reductions in hospital admissions have been reported for several conditions in the adult population; less evidence currently exists for children. To what extent such changes reflect a risk for patients due to unmet care needs, or a “correction” of previous overprovision of care has not been thoroughly examined yet. Based on complete national hospital discharge data, we compare the top 30 diagnoses for which children were hospitalised in 2019, 2020 and 2021 in Germany. We also analyse the development of monthly admissions between January 2019 and December 2021 for three tracers of variable urgency and severity. Total admissions were approximately 20% lower in 2020 and 2021 compared to 2019. The composition of the most frequent diagnoses did not change dramatically across years, although changes in rank were observed. The number of admissions for acute lymphoblastic leukaemia (tracer 1) showed a slight increasing trend and a periodicity prima vista unrelated to pandemic factors. Appendicitis admissions (tracer 2) decreased by about 9% in 2020 and a further 8% in 2021, while tonsillectomies/adenoidectomies (tracer 3) decreased by more than 40% in 2020 and a further 30% in 2021; for these tracers, monthly changes are in line with pandemic waves. Observed variations in child hospitalisations reflect the effects of pandemic mitigation measures and/or changes in demand. In Germany, inpatient care for critical conditions appears to have been largely upheld, potentially at the expense of elective treatments. Complementary data on ambulatory care and health outcomes would enable a better understanding of change in healthcare patterns and effects on children's health.

Health care patterns and policies in 18 European countries during the first wave of the COVID-19 pandemic: An observational study

Background

The coronavirus disease 2019 (COVID-19) pandemic has developed into an unprecedented global challenge. Differences between countries in testing strategies, hospitalization protocols as well as ensuring and managing ICU capacities can illustrate initial responses to a major health system shock, and steer future preparedness activities.

Methods

Publicly available daily data for 18 European countries were retrieved manually from official sources and documented in an Excel table (March–July 2020). The ratio of tests to cases, the share of hospitalizations out of all cases and the share of ICU admissions out of all hospitalizations were computed using 7-day rolling averages per 100 000 population. Information on country policies was collected from the COVID-19 Health System Response Monitor of the European Observatory on Health Systems and Policies. Information on health care capacities, expenditure and utilization was extracted from the Eurostat health database.

Results

There was substantial variation across countries for all studied variables. In all countries, the ratio of tests to cases increased over time, albeit to varying degrees, while the shares of hospitalizations and ICU admissions stabilized, reflecting the evolution of testing strategies and the adaptation of COVID-19 health care delivery pathways, respectively. Health care patterns for COVID-19 at the outset of the pandemic did not necessarily follow the usual health service delivery pattern of each health system.

Conclusions

This study enables a general understanding of how the early evolution of the pandemic influenced and was influenced by country responses and clearly demonstrates the immense potential for cross-country learning.

A country-level analysis comparing hospital capacity and utilisation during the first COVID-19 wave across Europe

BACKGROUND

The exponential increase in SARS-CoV-2 infections during the first wave of the pandemic created an extraordinary overload and demand on hospitals, especially intensive care units (ICUs), across Europe. European countries have implemented different measures to address the surge ICU capacity, but little is known about the extent. The aim of this paper is to compare the rates of hospitalised COVID-19 patients in acute and ICU care and the levels of national surge capacity for intensive care beds across 16 European countries and Lombardy region during the first wave of the pandemic (28 February to 31 July).

METHODS

For this country level analysis, we used data on SARS-CoV-2 cases, current and/or cumulative hospitalised COVID-19 patients and current and/or cumulative COVID-19 patients in ICU care. To analyse whether capacities were exceeded, we also retrieved information on the numbers of hospital beds, and on (surge) capacity of ICU beds during the first wave of the COVID-19 pandemic from the COVID-19 Health System Response Monitor (HSRM). Treatment days and mean length of hospital stay were calculated to assess hospital utilisation.

RESULTS

Hospital and ICU capacity varied widely across countries. Our results show that utilisation of acute care bed capacity by patients with COVID-19 did not exceed 38.3% in any studied country. However, the Netherlands, Sweden, and Lombardy would not have been able to treat all patients with COVID-19 requiring intensive care during the first wave without an ICU surge capacity. Indicators of hospital utilisation were not consistently related to the number of SARS-CoV-2 infections. The mean number of hospital days associated with one SARS-CoV-2 case ranged from 1.3 (Norway) to 11.8 (France).

CONCLUSION

In many countries, the increase in ICU capacity was important to accommodate the high demand for intensive care during the first COVID-19 wave.

[ST-elevation Myocardial Infarction and Percutaneous Coronary Intervention: Analysis of Time Stamps in Hospital Administrative Data]

BACKGROUND

German hospital administrative data contain demographic, medical, and administrative information on inpatients, as well as time stamps, such as time of admission or when a medical procedure was carried out. Time stamps allow the calculation of important process indicators which may help to assess quality of care. However, regarding the plausibility of time stamps in German hospital administrative data, no information is as yet available. This study investigates time stamps through the example of ST-elevation myocardial infarction and percutaneous coronary intervention aiming to provide first indications on the plausibility of time stamp documentation.

METHODS

Based on complete national German hospital administrative data (DRG statistics) from 2014 to 2017, all inpatient cases with ST-elevation myocardial infarction in the first admitting hospital were identified. Date and time of admission and date and time of percutaneous coronary intervention were analyzed. Time intervals were calculated as difference between time of admission and time of percutaneous coronary intervention and were categorized in groups.

RESULTS

The analysis of time of admission of inpatient cases with ST-elevation myocardial infarction (n=254,719) showed a pattern with highest frequencies between 9 a.m. and 1 p.m. on working days. The pattern of time of percutaneous coronary interventions (n=206,079) was similar but revealed frequency peaks at noon and midnight. The share of inpatient cases with implausible time intervals between time of admission and time of percutaneous coronary intervention declined from 9.5% in 2014 to 7.8% in 2017 and showed high variation on the hospital level.

CONCLUSION

Analyzing time stamps in hospital administrative data may provide valuable information on treatment processes while clinical staff may be released from separate documentation tasks. However, the results of this study indicate that the reliability of time stamps is affected by implausible entries and several uncertainties. The quality of time stamp documentation in German hospital administrative data might be improved by setting incentives for correct documentation and by setting out definite specifications of time points, such as time of admission.

Acute Appendicitis: Trends in Surgical Treatment

BACKGROUND

Appendectomy is the gold standard for treatment of acute appendicitis. However, recent studies favor primary antibiotic therapy. The aim of this observational study was to explore changes in the numbers of operations for acute appendicitis in the period 2010-2017, paying special attention to disease severity.

METHODS

Data from diagnosis-related group statistics were used to analyze the trends, mortality, and complication rates in the surgical treatment of appendicitis in Germany between 2010 and 2017. All cases of appendectomy after a diagnosis of appendicitis were included.

RESULTS

Altogether, 865 688 inpatient cases were analyzed. The number of appendectomies went down by 9,8%, from 113 614 in 2010 to 102 464 in 2017, while the incidence fell from 139/100 000 in 2010 to 123/100 000 in 2017 (standardized by age group). This decrease is due to the lower number of operations for uncomplicated appendicitis (79 906 in 2017 versus 93 135 in 2010). Hospital mortality decreased both in patients who underwent surgical treatment of complicated appendicitis (0.62% in 2010 versus 0.42% in 2017) and in those with a complicated clinical course (5.4% in 2010 versus 3.4% in 2017).

CONCLUSION

Decisions on the treatment of acute appendicitis in German hospitals follow the current trend towards non-surgical management in selected patients. At the same time, the care of acute appendicitis has improved with regard to overall hospital morbidity and hospital mortality.

[Opportunities and limitations of risk adjustment of quality indicators based on inpatient administrative health data - a workshop report]

INTRODUCTION

The quality indicators of the Initiative Qualitätsmedizin e. V. (IQM) have been developed as triggers to examine treatment processes for opportunities for improvement. Published quality results have partly been used for external quality comparisons in the media. Therefore, member hospitals of IQM demanded to investigate if methods of risk adjustment should be applied in the calculation of the quality indicators. After a hearing of experts had been held, a task force was founded to conduct test calculations on risk adjustment methods.

METHODS

Specific risk adjustment models for mortality in myocardial infarction, heart failure, stroke, pneumonia, and colectomy in colorectal cancer were developed in the database of national German DRG data of the year 2016. These models were used to calculate standardized mortality ratios (SMR) per indicator in a sample of 172 member hospitals of IQM based on the data of the year 2018. Median SMR per indicator were compared to median SMR based on a standardization by age and gender, which is the standard procedure in IQM. Correlations between the different SMR were calculated. Quality of care was judged by two different approaches: a) a descriptive discrepancy of |0.1| from the SMR value of 1, and b) a significant discrepancy from 1 using the 95% confidence limits. The effect of using the specific risk adjustment in relation to the standard procedure was investigated for both approaches (a and b).

RESULTS

The specific risk adjustment methods showed an area under the curve between 0.72 and 0.84. The median differences between the SMR based on standardization by age and gender and the SMR based on specific risk adjustment were small (between 0 and 0.4); Spearman's correlations were between 0.90 and 0.99. Changes in the judgement of quality of care in comparison to the national average occurred in 3.9% (mortality from pneumonia) to 20.6% of the hospitals (mortality from heart failure) in descriptive comparisons. When the judgement was based on confidence limits changes were observed in 1.6% (mortality after colectomy) to 17.4% of the hospitals (mortality from heart failure).

DISCUSSION

Implementing specific risk adjustment models had only minor effects on the distribution of risk-adjusted mortality compared to the standard procedure, but the judgement of quality of care could change for a fifth of the hospitals in individual indicators. Concerning methodological and practical reasons, the task force recommends further development of risk adjustment methods for selected indicators. This should be accompanied by studies on the validity of inpatient administrative data for quality management as well as by efforts to improve the usefulness of these data for such purposes.

Evaluating quality variation of emergency departments

Background

Germany introduced a graduated system of emergency levels (0 non-participation; 1 for basic up to 3 for comprehensive infrastructure) to overcome various inefficiencies of hospital emergency care. For each level, detailed requirements must be met, however, the case volume of conditions treated in the levels is unclear. Moreover, the relationship between emergency level and outcomes needs evaluation to analyse if patients are directed to the most appropriate hospital.

Methods

We selected three major emergency conditions - Stroke, AMI and Hip fracture - and matched risk-adjusted outcome and process indicators on hospital level to the hospital respective emergency level. Descriptive statistics such as distribution and correlation are used to examine the allocation of cases to emergency levels and to analyse the effect of structural differences on health outcomes.

Results

We saw large variations in quality for all clinical conditions regardless of the emergency level. Hospitals with a small case number showed greater fragmentation; hospitals that did not meet the requirements nevertheless performed interventions for AMI and stroke. In detail, 30-day mortality of AMI shows high variation of quality results in level 1; for stroke it is underperformed with almost 10% in hospitals with level 0. Pre-operative LOS for hip fracture is above the acceptable average in any level (tolerance range ≤ 15%), and the ratio O/E in mortality is noticeable for 40% of hospitals with level 0.

Conclusions

Many cases are treated in low volume hospitals with wide quality variation and subpar results. Therefore, the definition of emergency levels should be integrated to emergency pathways which might help to direct patients to the most appropriate hospital. Moreover, many emergency symptoms are not captured by available quality metrics and current classification systems which shows that emergency service provision is to a large extent not covered by current measurement initiatives.

Key messages

Emergency service provision is fragmented and not related to emergency levels. Development of emergency quality indicators is needed.

Evaluating the consequences of health policy decisions

Uncertainty about intended and possible unintended side effects makes it important to evaluate changes following health policy decisions. A recent IJHPR article by Greenberg et al. evaluated changes in emergency department care following a directive of the Israeli Ministry of Health to limit occupancy in internal medicine wards. Over a six-year observation period, they found that one-month mortality and one-week readmissions after ED visits remained unchanged, while increases in average ED visit length, as well as increased delay time from ED admission to ward were observed. These findings help to assess the impact of the occupancy limit directive and may support future health policy decisions.

However, the study by Greenberg et al. was limited by the unavailability of diagnostic data, and this illustrates a significant issue that transcends this particular study. In many countries, policy-relevant administrative data are not sufficiently available on a timely basis. Data availability is the prerequisite for monitoring developments in patterns of care following health policy changes. Besides conducting retrospective studies, timely availability of data makes it possible to establish monitoring systems which may help decision makers assess the impact of policy changes, identify undesired developments early, and recognize changes in need or demand of health services within the population.

[Definition of Variables in Hospital Discharge Data: Pitfalls and Proposed Solutions]

In Germany, the Diagnosis-Related Group Statistics (DRG Statistics) supply full coverage of inpatient episodes in acute care hospitals. The Research Data Centres of the Federal Statistical Office and the Statistical Offices of the Federal States provide the microdata of the DRG Statistics, namely hospital discharge files of each inpatient case, for scientific research. Hospital discharge data are generated for administrative purposes. As well as other data sources, they have specific features and characteristics, which should be considered in planning and designing research studies. A key challenge is the appropriate and sophisticated operationalization of units of analysis, targets variables, and other study variables. The methodological approach should consider, among other factors, differing coding behaviour between hospitals in order to minimize the risk of bias. This contribution shows by practical examples what should be incorporated in variable definition to ensure that the risk of bias by coding behaviour or other factors is minimized to the greatest possible degree. First of all, the features and characteristics of the German hospital discharge data are outlined. Based on the authors' experiences, basic steps and challenges in observational health services research studies are described. Examples are illustrated by our own calculations, derived from previous studies based on the microdata of the DRG Statistics. The reliability and validity of analyses based on hospital discharge data are crucially dependent on the appropriateness of variable definition. To minimize the risk of bias and misinterpretation, extensive preliminary considerations are required which involve clinical aspects, as well as the context of data collection and technical classification opportunities. Hopefully, there will be greater acceptance of research based on hospital discharge data, so that these valuable data will be used more frequently for research purposes in the future.

Hospital Volume, In-Hospital Mortality, and Failure to Rescue in Esophageal Surgery

BACKGROUND

In Germany, complex esophageal surgery is often performed in hospitals with low case numbers. For these procedures, an association exists between hospital case numbers and treatment outcomes, possibly because of differences in complication management. This aspect of the association between volume and outcome in esophageal surgery has not yet been studied in Germany.

METHODS

On the basis of nationwide hospital discharge data (DRG statistics) from the years 2010 to 2015, the association between volume and outcome was analyzed in relation to in-hospital mortality, the frequency of complications, and the mortality of patients who had complications.

RESULTS

22 700 cases of complex esophageal surgery were identified. The probability of dying after esophageal surgery was much lower in hospitals with very high case numbers (median, 62 per year) than in those with very low case numbers (median, two per year), with an odds ratio (OR) of 0.50 (95% confidence interval, [0.42; 0.60]). At least one complication was documented for more than half of all patients; no association was found between the frequency of complications and the hospital case volume. The in-hospital mortality among patients who had complications was 12.3% [11.1; 13.7] in hospitals with very high case numbers and 20.0% [18.5; 21.6] in hospitals with very low case numbers. Of the 4032 procedures performed in 2015, 83% were for cancer of the esophagus.

CONCLUSION

These findings indicate that the quality of care for patients undergoing esophageal surgery in Germany could be improved if more patients were treated in hospitals with high case numbers. The observed association between case numbers and outcomes is tightly linked to failure to rescue.

Versorgungsstrukturen und Mengen-Ergebnis-Beziehung beim akuten Herzinfarkt – Verlaufsbetrachtung der deutschlandweiten Krankenhausabrechnungsdaten von 2005 bis 2015

Hintergrund Studien haben beschrieben, dass höhere Herzinfarktfallzahlen des behandelnden Krankenhauses mit besseren Behandlungsergebnissen assoziiert sind. Vor diesem Hintergrund wird die Entwicklung der akutstationären Herzinfarktversorgung sowie der Mengen-Ergebnisbeziehung im Zeitverlauf analysiert. Ziel der Arbeit ist, die Entwicklungen zu bewerten und Anhaltspunkte für eine Verbesserung der Herzinfarktversorgung in Deutschland abzuleiten.

Methode Anhand der deutschlandweiten Krankenhausabrechnungsdaten (DRG-Statistik) von 2005 bis 2015 wurden Patienten mit akutem Herzinfarkt im erstbehandelnden Krankenhaus identifiziert und anhand der jährlichen Herzinfarktfallzahl des behandelnden Krankenhauses in fallzahlgleiche Quintile eingeteilt.

Ergebnisse Im Beobachtungszeitraum zeigte sich ein zunehmender Anteil interventionell versorgter Herzinfarktpatienten. Die Krankenhaussterblichkeit im erstbehandelnden Krankenhaus ging insgesamt von 12,1 auf 8,7% zurück. In allen Jahren wurde in den höheren Fallzahlquintilen eine geringere Sterblichkeit im Vergleich zum unteren Fallzahlquintil beobachtet. Im Jahr 2015 zeigte sich im Vergleich zur Behandlung in Krankenhäusern mit sehr geringer Fallzahl ein um 20% reduziertes Sterberisiko (adjustiertes OR jeweils 0,8 [95% KI 0,7–0,9]) in Krankenhäusern mit mittlerer, hoher oder sehr hoher Fallzahl. Mehr als 40% der Krankenhäuser mit sehr geringer Fallzahl waren in städtischen Regionen lokalisiert.

Schlussfolgerung Eine gezieltere Steuerung von Patienten mit Herzinfarktsymptomen in Krankenhäuser mit hohen Herzinfarktfallzahlen könnte die Versorgung weiter verbessern. Eine solche Versorgungssteuerung ist sowohl aus Gründen der medizinischen Qualität als auch der Wirtschaftlichkeit insbesondere in städtischen Regionen erforderlich.

Amputation rates of the lower limb by amputation level - observational study using German national hospital discharge data from 2005 to 2015

Background

In international comparisons, rates of amputations of the lower limb are relatively high in Germany. This study aims to analyze trends in lower limb amputations over time, as well as outcomes of care concerning in-hospital mortality and reamputation rates during the same hospital stay which might indicate the quality of surgical and perioperative health care processes.

Methods

This work is an observational population-based study using complete national hospital discharge data (Diagnosis-Related Group Statistics (DRG Statistics)) from 2005 to 2015. All inpatient cases with lower limb amputation were identified and stratified by eight amputation levels. Time trends of case numbers and in-hospital mortality were studied age-sex standardized. For inpatient cases with reamputation during the same hospital stay, first and last amputation levels were cross tabulated.

Results

A total of 55,595 amputations of the lower limb in 2015 (52,096 in 2005) were identified. After age-sex standardization to the demographic structure of 2005, a relative decrease of − 11.1% was revealed (men − 2.6%, women − 25.0%). The stratified analysis by amputation levels showed that the decreases were induced by higher amputation levels, whereas the amputation levels of toe/foot ray after standardization still showed a relative increase of + 12.8%. In-hospital mortality of all cases with lower limb amputation fell from 19.8% in 2005 to 17.4% in 2015 (SMR 0.89 [95% CI 0.86; 0.92]). The percentage of reamputations during the same hospital stay declined from 13.2 to 10.2%.

Conclusions

The number of lower limb amputations declined in Germany, however distinctly stronger in women than in men. The observed decreases of in-hospital mortality as well as of reamputation rates point to improvements in perioperative health care. Despite these indications of improvements, the distinct increase in case numbers at the level of toe/foot ray calls for additional targeted prevention efforts, especially for patients with diabetes.

Electronic supplementary material

The online version of this article (10.1186/s12913-018-3759-5) contains supplementary material, which is available to authorized users.

[Volume Growth of Inpatient Treatments for Spinal Disease - Analysis of German Nationwide Hospital Discharge Data from 2005 to 2014]

BACKGROUND

Marked volume growth of inpatient treatments for spinal disease has been observed since diagnosis related groups (DRG) were introduced as payment for inpatient services in Germany. This study aims to analyse this increase by population and stratified by types of treatment.

MATERIAL AND METHODS

Using German nationwide hospital discharge data (DRG statistics), inpatient treatments for spinal disease with or without surgery were identified. Trends in case numbers were analysed from 2005 to 2014 with consideration of demographic changes, in order to explore which age groups and which types of treatment are affected by volume growth.

RESULTS

In 2014 (2005), 289 000 (177 000) inpatient treatments with surgery and 463 000 (287 000) treatments without surgery were identified. After adjusting for demographic factors, treatments with and without surgery exhibited a relative volume growth of + 50%. This increase affected higher age groups and women, in particular. Depending on the type of treatment, very different degrees of volume growth were observed. For example, disc surgeries adjusted for demographic change increased by about + 5%, whereas spinal fusion and vertebral replacement surgeries, kypho-/vertebroplasties and decompression of the spine more than doubled. Within the non-surgically treated cases, local pain therapies of the spine increased after adjustment for demographic changes by about + 142%. The conservatively treated cases showed a demographically adjusted increase of + 22%.

CONCLUSION

Apart from demographic changes, this analysis cannot resolve the underlying causes of volume growth in treatments for spinal disease. However, the stratified analysis of various subgroups may help to classify these developments in a more differentiated manner. The results may support a more targeted debate about potential over- or misallocation of inpatient services in this area.

Hospital volume and mortality for 25 types of inpatient treatment in German hospitals: observational study using complete national data from 2009 to 2014

OBJECTIVES

To explore the existence and strength of a relationship between hospital volume and mortality, to estimate minimum volume thresholds and to assess the potential benefit of centralisation of services.

DESIGN

Observational population-based study using complete German hospital discharge data (Diagnosis-Related Group Statistics (DRG Statistics)).

SETTING

All acute care hospitals in Germany.

PARTICIPANTS

All adult patients hospitalised for 1 out of 25 common or medically important types of inpatient treatment from 2009 to 2014.

MAIN OUTCOME MEASURE

Risk-adjusted inhospital mortality.

RESULTS

Lower inhospital mortality in association with higher hospital volume was observed in 20 out of the 25 studied types of treatment when volume was categorised in quintiles and persisted in 17 types of treatment when volume was analysed as a continuous variable. Such a relationship was found in some of the studied emergency conditions and low-risk procedures. It was more consistently present regarding complex surgical procedures. For example, about 22 000 patients receiving open repair of abdominal aortic aneurysm were analysed. In very high-volume hospitals, risk-adjusted mortality was 4.7% (95% CI 4.1 to 5.4) compared with 7.8% (7.1 to 8.7) in very low volume hospitals. Theminimum volume above which risk of death would fall below the average mortality was estimated as 18 cases per year. If all hospitals providing this service would perform at least 18 cases per year, one death among 104 (76 to 166) patients could potentially be prevented.

CONCLUSIONS

Based on complete national hospital discharge data, the results confirmed volume-outcome relationships for many complex surgical procedures, as well as for some emergency conditions and low-risk procedures. Following these findings, the study identified areas where centralisation would provide a benefit for patients undergoing the specific type of treatment in German hospitals and quantified the possible impact of centralisation efforts.

Deaths Following Cholecystectomy and Herniotomy: An Analysis of Nationwide German Hospital Discharge Data From 2009 to 2013

BACKGROUND

In 2010, 158 000 cholecystectomies and 207 000 herniotomies (without bowel surgery) were performed in Germany as inpatient procedures, generally on a routine, elective basis. Deaths following such operations are rare events. We studied the potential association of death after cholecystectomy or herniotomy with risk factors that could have been detected beforehand, and we examined the types of complications that were documented in these cases.

METHODS

Using nationwide hospital discharge data (DRG statistics) for the years 2009-2013, we analyzed the characteristics of patients who died in the hospital after undergoing a cholecystectomy for cholelithiasis or the repair of an inguinal, femoral, umbilical, or abdominal wall hernia. We compared these data with those of patients who survived and studied the impact of the coded comorbidities on the risk of death.

RESULTS

In Germany, in the years 2009-2013, there were 2957 deaths after a total of 731 000 cholecystectomies (in-hospital mortality, 0.4%) and 1316 deaths after a total of 1 023 000 herniotomies without bowel surgery (0.13%). The patients who died were markedly older than those who did not, and they more commonly had comorbidities. Factors associated with a higher risk of death were age over 65 years, and comorbidities such as congestive heart failure, chronic pulmonary or hepatic disease, or poor nutritional status. Complications were coded much more often for the patients who died than for those who did not.

CONCLUSION

These findings suggest that there is potential for improvement in preoperative risk identification, complication avoidance, and the early recognition and treatment of complications, as well as in safe surgical technique. Measures to lower the mortality associated with herniotomy and cholecystectomy would lessen patients' individual risk and thereby improve patient safety.

[Impact of quality measurement, transparency and peer review on in-hospital mortality - retrospective before-after study with 63 hospitals]

BACKGROUND

In 2008 the 'Initiative Qualitätsmedizin' (initiative for quality in medical care, IQM) was established as a voluntary non-profit association of hospital providers of all kinds of ownership. Currently, about 350 hospitals from Germany and Switzerland participate in IQM. Member hospitals are committed to a quality strategy based on measuring outcome indicators using administrative data, peer review procedures to improve medical quality, and transparency by public reporting. This study aims to investigate whether voluntary implementation of this approach is associated with improvements in medical outcome.

METHODS

Within a retrospective before-after study 63 hospitals, which started to participate in IQM between 2009 and 2011, were monitored. In-hospital mortality in these hospitals was studied for 14 selected inpatient services in comparison to the German national average. The analyses examine whether in-hospital mortality declined after participation of the studied hospitals in IQM, independently of secular trends or deviations in case mix when compared to the national average, and whether such findings were associated with initial hospital performance or peer review procedures.

RESULTS

Declining in-hospital mortality was observed in hospitals with initially subpar performance. These declines were statistically significant for treatment of myocardial infarction, heart failure, pneumonia, and septicemia. Similar, but statistically non-significant trends were observed for nine further treatments. Following peer-review procedures significant declines in in-hospital mortality were observed for treatments of myocardial infarction, heart failure, and pneumonia. Mortality declines after peer reviews regarding stroke, hip fracture and colorectal resection were not significant, and after peer reviews regarding mechanically ventilated patients no changes were observed.

CONCLUSION

The results point to a positive impact of the quality approach applied by IQM on clinical outcomes. A more targeted selection of hospitals to be peer-reviewed might further enhance the impact of this approach.

[Minimum Caseload Requirements and In-hospital Mortality: Observational Study using Nationwide Hospital Discharge Data from 2006 to 2013]

Background: In order to improve hospital care, minimum caseload requirements for certain elective hospital treatments have been defined by law in Germany. This study analyses retrospectively if adherence to this regulation is associated with the outcome of hospital treatment. Differences in in-hospital mortality were analyzed for complex esophageal and pancreatic surgery, liver and kidney transplantation, stem cell transplantation and total knee replacement. Methods: Within individual inpatient data of the nationwide German hospital discharge data (DRG statistics) all inpatient episodes subject to the minimum volume requirements were identified and annual caseloads per hospital were calculated. Inpatient episodes were assigned to 2 groups: Patients treated in hospitals with a caseload equal to or greater than the minimum caseload (≥ MC) and patients treated in hospitals with a caseload below the minimum caseload (< MC). Logistic regression was used to calculate adjusted in-hospital mortality. Results: In total, 28 931 esophageal surgeries, 78 879 pancreatic surgeries, 7 984 liver transplantations, 21 773 kidney transplantations, 51 064 stem cell transplantations and 1 093 296 total knee replacements were analyzed. Adjusted in-hospital mortality in hospitals with a caseload≥MC was significantly lower than in hospitals with a caseload<MC for esophageal surgery (9.2% [95% KI 8.8-9,6] vs. 12.1% [11.4-12.9]), pancreatic surgery (8.6% [8.3-8.8] vs. 11.8% [11.2-12.5]), kidney transplantation (1.7% [1.4-1.8] vs. 3.3% [2.1-5.0]) and total knee replacement (0.13% [0.12-0.14] vs. 0.18% [0.14-0.23]). For liver transplantation, no significant difference in adjusted mortality was found (15.5% [14.7-16.5] vs. 15.9% [12.9-19.3]). For stem cell transplantation mortality in hospitals with a caseload≥MC was significantly higher than in hospital with a caseload<MC (6.0% [5.7-6.2] vs. 4.0% [3.2-4.9]). Conclusion: For 4 of the 6 studied treatments, a significantly lower risk of in-hospital death was observed in hospitals that adhere to the minimum caseload requirement. This implies that, for those treatments, full implementation of the minimum caseload regulation could improve the quality of hospital care in Germany.

Disease-Specific Trends of Comorbidity Coding and Implications for Risk Adjustment in Hospital Administrative Data

OBJECTIVE

To investigate changes in comorbidity coding after the introduction of diagnosis related groups (DRGs) based prospective payment and whether trends differ regarding specific comorbidities.

DATA SOURCES

Nationwide administrative data (DRG statistics) from German acute care hospitals from 2005 to 2012.

STUDY DESIGN

Observational study to analyze trends in comorbidity coding in patients hospitalized for common primary diseases and the effects on comorbidity-related risk of in-hospital death.

EXTRACTION METHODS

Comorbidity coding was operationalized by Elixhauser diagnosis groups. The analyses focused on adult patients hospitalized for the primary diseases of heart failure, stroke, and pneumonia, as well as hip fracture.

PRINCIPAL FINDINGS

When focusing the total frequency of diagnosis groups per record, an increase in depth of coding was observed. Between-hospital variations in depth of coding were present throughout the observation period. Specific comorbidity increases were observed in 15 of the 31 diagnosis groups, and decreases in comorbidity were observed for 11 groups. In patients hospitalized for heart failure, shifts of comorbidity-related risk of in-hospital death occurred in nine diagnosis groups, in which eight groups were directed toward the null.

CONCLUSIONS

Comorbidity-adjusted outcomes in longitudinal administrative data analyses may be biased by nonconstant risk over time, changes in completeness of coding, and between-hospital variations in coding. Accounting for such issues is important when the respective observation period coincides with changes in the reimbursement system or other conditions that are likely to alter clinical coding practice.

Achieving minimum caseload requirements--an analysis of hospital discharge data from 2005-2011

BACKGROUND

The German Federal Joint Committee (the highest decision-making body of physicians and health insurance funds in Germany) has established minimum caseload requirements with the goal of improving patient care. Such requirements have been in place for five types of surgical procedure since 2004 and were introduced for total knee endoprosthesis surgery in 2006 and for the care of low-birth-weight neonates (weighing less than 1250 g) in 2010.

METHOD

We analyzed data from German nationwide DRG statistics (DRG = diagnosis-related groups) for the years 2005-2011. The procedures that were performed were identified on the basis of their operation and procedure codes, and the low-birth-weight neonates on the basis of their birth weight and age. The treating facilities were distinguished from one another by their institutional identifying numbers, which were contained in the DRG database.

RESULTS

In 2011, there were 172 838 hospitalizations to which minimum caseload requirements were applicable. 4.5% of these took place in institutions that did not meet the minimum requirement for the procedure in question. The percentage of institutions that did not meet the minimum caseload requirement for complex pancreatic surgery fell significantly from 64.6% in 2006 to 48.7% in 2011, and the percentage of pancreatic surgery cases treated in such institutions fell over the same period from 19.0% to 11.4%. A significant reduction in the number of institutions treating low-birth-weight neonates was already evident before minimum caseload requirements were introduced. For all other types of procedure subject to minimum caseload requirements, there has been no significant change either in the percentage of institutions meeting the requirements or in the percentage of cases treated in such institutions.

CONCLUSION

After taking account of the potential bias due to the identification of institutions by their institutional identifying numbers, we found no discernible effect of minimum caseload requirements on care structures over the seven-year period of observation, with the possible exception of a mild effect on pancreatic procedures.

Hip and knee replacement in Germany and the USA: analysis of individual inpatient data from German and US hospitals for the years 2005 to 2011

BACKGROUND

The number of hip and knee replacement operations is rising in many industrialized countries. To evaluate the current situation in Germany, we analyzed the frequency of procedures in Germany compared to the USA, with the aid of similar case definitions and taking demographic differences into account.

METHODS

We used individual inpatient data from Germany (DRG statistics) and the USA (Nationwide Inpatient Sample) to study differences in the age- and sex-adjusted rates of hip and knee replacement surgery and the determinants of trends in case numbers over the years 2005 to 2011.

RESULTS

In 2011, hip replacement surgery was performed 1.4 times as frequently in Germany as in the USA (284 vs. 204 cases per 100 000 population per year; the American figures have been adjusted to the age and sex structure of the German population). On the other hand, knee replacement surgery was performed 1.5 times as frequently in the USA as in Germany (304 [standardized] vs. 206 cases per 100,000 population per year). Over the period of observation, the rates of both procedures increased in both countries. The number of elective primary hip replacement operations in Germany grew by 11%, from 140,000 to 155 300 (from 170 to 190 per 100,000 persons); after correction for demographic changes, a 3% increase remained. At the same time, the rate of elective primary hip replacement surgery in the USA rose by 28%, from 79 to 96 per 100 000 population, with a 13% increase remaining after correction for demographic changes.

CONCLUSION

There are major differences between Germany and the USA in the frequency of these operations. The observed upward trend in elective primary hip replacement operations was mostly due to demographic changes in Germany; non-demographic factors exerted a stronger influence in the USA than in Germany. With respect to primary knee replacement surgery, non-demographic factors exerted a comparably strong influence in both countries.

Quality measurement combined with peer review improved German in-hospital mortality rates for four diseases

Mortality rates during hospital stays for common diseases show considerable variation at the hospital level, which suggests that there is potential for outcome improvement. We studied changes in mortality after an intervention that aimed to improve medical outcomes through quality measurement combined with peer review. We examined eighteen acute care hospitals purchased by the Helios Hospital Group in Germany from one year before to three years after the start of the intervention. In-hospital mortality for myocardial infarction, heart failure, ischemic stroke, and pneumonia was stratified by initial hospital performance and compared to the German average. Following the intervention, hospitals whose performance was initially subpar significantly reduced in-hospital mortality for all four diseases. In hospitals that initially performed well, no significant changes in mortality were observed. The observational nonrandomized data suggest that the quality management approach was associated with improved outcomes in initially subpar hospitals. Disease-specific measures of mortality, combined with peer reviews, can be used to direct actions to areas of potential improvement.

Stroke Unit Care and Trends of In-Hospital Mortality for Stroke in Germany 2005–2010

Background

In Germany, the financing of stroke unit care was implemented into the hospital reimbursement system in 2006. Since then, many acute care hospitals newly implemented stroke units. Simultaneous, in-hospital mortality for stroke declined.

Aims

The study aims to analyze the association of mortality trends for stroke with the increasing provision of stroke unit care in German hospitals.

Methods

Hospitalizations for acute stroke from 2005 to 2010 are identified in the nationwide German Diagnosis Related Groups statistics. Trends of risk-adjusted in-hospital mortality are studied stratified by existence of a stroke unit in the admitting hospital, as well as stratified by cohorts of hospitals defined by the respective period of stroke unit implementation.

Results

Overall, mortality in patients admitted to stroke unit hospitals is lower (crude 9·2%; adjusted 9·8%) compared to patients admitted to nonstroke unit hospitals (12·7%; 11·6%). The longitudinal analysis revealed a general secular trend of declining mortality in all cohorts of hospitals. However, while all stroke unit-providing hospital cohorts converge to a quite similar level of mortality in 2010, mortality in hospitals without stroke unit remains significantly higher. Reduction of mortality in hospitals with early provision of stroke unit care seems to be attributable to the secular trend. A reduction of mortality exceeding the secular trend was observed in hospitals with late stroke unit implementation.

Conclusions

The earlier stroke unit implementations might represent rather ‘formal’ inceptions in experienced hospitals with preexisting appropriate stroke care, whereas late implementations seem to have caused extra improvements. Overall, stroke patients are more likely to survive when admitted to an stroke unit-providing hospital. A more stringent assignment of acute stroke patients to stroke unit-providing hospitals could possibly further reduce stroke mortality in Germany.

Trends in acute inpatient stroke care in Germany--an observational study using administrative hospital data from 2005-2010

BACKGROUND

Administrative hospital data can be used to detect trends in the care of patients hospitalized with acute stroke.

METHODS

The nationwide German DRG statistics for the years 2005 to 2010 were used to identify hospitalizations for acute stroke. All hospitalizations of patients with a principal diagnosis of acute stroke who were over 19 years old on admission were included in the analysis; admissions transferred from other acute care hospitals were excluded. The data were analyzed to determine annual hospitalization rates, characteristics of the patients and hospitals, patterns of care, and in-hospital mortality.

RESULTS

The number of hospitalizations for acute stroke in Germany per year ranged from 235 000 in 2005 to 243 000 in 2010. After standardization for the age and sex structure of the population 2005, the annual hospitalization rate was found to have declined over the period of the study from 357 to 336 hospitalizations per 100 000 persons. The decline occurred mainly in older patients (in men from age 60 and in women from age 70 onward). The percentage of patients cared for in a stroke unit ("complex treatment" in the coding system of the German Classification of Operations and Procedures [Operationen- und Prozedurenschlüssel, OPS]) rose from 15% to 52%. The percentage of patients with cerebral infarction who received systemic thrombolytic treatment rose from 2.4% to 8.9%. In-hospital mortality declined from 11.9% in 2005 to 9.5% in 2010, with a standardized 2005-versus-2010 mortality ratio of 0.79.

CONCLUSION

The declining hospitalization rate of elderly patients might reflect the impact of better primary and/or secondary prevention. The findings also reveal a trend toward more specific care for acute stroke, which may be the cause of the observed decline in in-hospital mortality.

[Disease-specific patterns of hospital care in Germany analyzed via the German Inpatient Quality Indicators (G-IQI)]

OBJECTIVE

Using the categories of the German Inpatient Quality indicators (G-IQI) important characteristics of inpatient care were analyzed on the national level in Germany. The evaluation gives an overview of total national case numbers and number of hospitals involved in the treatment of important diseases.

METHOD

The analysis was based on the national so called 'DRG database' for the year 2010, which covers all German inpatient DRG cases (all patient / all payer database). With the major exception of psychiatric and psychosomatic cases this database covers 17.43 of the 18.49 million German inpatient cases. The coded diagnoses and procedures as well as demographic information were used to group cases into G-IQI disease categories. The respective total case numbers, number of hospitals providing the services, interquartile range of case distribution, in-hospital mortality and interquartile range of standardized mortality ratios were investigated.

RESULTS

Especially for less frequent diseases and procedures it is shown, that many hospitals treat very low case numbers. For example for gastric resection the lower quartile is 4, for esophageal resection 1 and for cystectomy 5. Even for a more frequent disease like myocardial infarction the lower quartile is 36. Mortalities also show considerable variation. However, due to the low case numbers in many hospitals, the deviation of hospital mortality from the German average can only become significant for rather few hospitals.

CONCLUSION

On the one hand this paper provides national reference values for the German Inpatient Quality Indicators, which cover 38.7 % of all inpatient cases and 50.8 % of in-hospital deaths. On the other hand it gives a first overview of the disease specific patterns of inpatient hospital care in Germany. Despite the high overall quality of the German health care system it suggests, that further improvement might be possible, if structural problems were addressed.