[Developments in Emergency Care - Analysis of Emergency Cases in In- and Outpatient Care from 2009 To 2015 in...

Increasing numbers of emergency cases, different stakeholders involved (physicians' practices vs. hospitals providing ambulatory and inpatient care) and changing patient utilization patterns lead to changes in health care needs. This study aimed at analyzing changes in patient characteristics as well as indications for in- and outpatient emergency care between 2009 and 2015 and their potential reasons.

Based on in- and outpatient routine data, we descriptively analyzed changes in emergency diagnosis, population-based emergency prevalence as well as regional differences and their changes over time. Using generalized linear models (GLM), we examined regional shifts in emergency cases being treated in ambulatory and inpatient settings.

Between 2009 and 2014 the number of cross-sectoral ambulatory emergency cases increased by 4 % (in emergency departments an increase by 42% with the highest incidence rate ratio (IRR) in the 20-34-year-old age group). Inpatient emergency cases increased by 20% with older patients representing the largest group. The ICD chapter "Diseases of the circulatory system", responsible for most inpatient hospital cases, had the second highest probability of hospital addmissions (64.7%). There were larger variations in indications for outpatient care. Regression analysis showed that there was greater use of ambulatory emergency services by the healthier (IRR 1.15 [KI 95%: 1.13; 1.16]) and urban population (IRR 1.14 [KI 95%: 1.13; 1.15]).

The first time cross-sector analysis of indication-specific emergencies based on nationwide inpatient and outpatient billing data from 2009-2015 provides insightsinto healthcare provision at the interface between the sectors. Indications that are treated in physician practices and emergency outpatient clinics and those that lead to hospital admissions point out the potential for managing patient care appropriately. Patient behaviors in healthcare utilization can be addressed by interventions for specific patient subgroups. However, a prerequisite for the development of such measures is the inclusion of a cross-sectoral perspective in the system of emergency care.