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Spatial analysis of Percutaneous Transluminal Coronary Angioplasty (PTCA) in Austria
R Strauss1, C Pfeifer, H Ulmer
1Ludwig-Boltzmann-Institute for Epidemiology and Research on Health Systems, c/o Institute for Biostatistics and Documentation, University of Innsbruck, Austria. reinhild.strauss@smi.ki.se
Insights
Geographical disparities in Percutaneous Transluminal Coronary Angioplasty (PTCA) utilization exist in Austria, linked to healthcare infrastructure rather than patient demand. Expansion of intervention centers is expected to reduce these variations.
Area of Science:
- Cardiovascular epidemiology
- Spatial analysis
- Health services research
Background:
- Geographical variations in healthcare access and outcomes are a significant concern.
- Understanding spatial patterns of Percutaneous Transluminal Coronary Angioplasty (PTCA) and associated morbidity is crucial for equitable healthcare delivery.
- Coronary heart disease, angina pectoris, and myocardial infarction represent major public health challenges.
Purpose of the Study:
- To investigate the geographical distribution of PTCA and morbidity for coronary heart disease, angina pectoris, and myocardial infarction in Austria.
- To identify clusters of high and low PTCA utilization and morbidity using spatial analysis techniques.
- To explore demand (morbidity) and supply (healthcare infrastructure) factors contributing to geographical disparities in PTCA access.
Main Methods:
- Retrospective record linkage study of Austrian residents diagnosed with myocardial infarction, coronary heart disease, or angina pectoris in 1995.
- Spatial analysis of standardized morbidity rates (SMR) at the district level.
- Application of Moran's I Statistic and Regional Spatial Autocorrelation Coefficient (RSAC) to identify geographical clusters.
Main Results:
- One 'positive' PTCA cluster (high SMRs) and one 'negative' PTCA cluster (low SMRs) were identified, differing significantly in morbidity, intervention rates, and bed availability.
- The 'negative' cluster showed an inverse relationship between PTCA utilization and morbidity, suggesting potential adherence to the 'inverse care law'.
- No significant correlation was found between PTCA SMR and demand or supply factors nationwide, but cluster differences in intervention centers and specialist density indicated supply-side influences on geographical disparity.
Conclusions:
- Geographical disparities in PTCA utilization and outcomes are evident in Austria.
- Healthcare supply factors, particularly the number and capacity of intervention centers and specialist density, appear to drive these geographical variations.
- Future expansion of intervention centers is anticipated to mitigate geographical inequalities in PTCA access and outcomes.
Study Objectives:
To investigate the geographical distribution of Percutaneous Transluminal Coronary Angioplasty (PTCA) and morbidity for coronary heart disease, angina pectoris and myocardial infarction by spatial analysis of the standardized morbidity rates (SMR) on district level. To identify clusters by Moran's I Statistic and the Regional Spatial Autocorrelation Coefficient (RSAC) of Munasinghe and Morris. To investigate demand factor morbidity and supply factor health care infrastructure on the district level as reasons for geographical disparity. To describe characteristics of the cluster population and intervention centres.
Study Design:
Retrospective record linkage study.
Setting:
All hospitals and cardiological centres in Austria (n = 150) which performed the Minimum Basic Data Set (MBDS).
Patients:
All Austrian residents who were diagnosed for myocardial infarction, coronary heart disease or angina pectoris in 1995 (n = 87,174).
Measurements And Main Results:
One 'positive' PTCA cluster (all SMRs > or =0.96) and one 'negative' PTCA cluster (all SMRs < or =0.59) were identified. They differed significantly in morbidity rate, intervention rate and available cardiological beds. The tendency to inverse relation between PTCA utilization and morbidity in the 'negative' cluster supported the thesis of 'inverse care law'. Austrianwide no significant correlation was found between the SMR of PTCA-application and both demand factor and supply factors. Nevertheless, differences between the clusters concerning number and capacity of intervention centres and density of specialists pointed to supply factors as reasons for geographical disparity. The ongoing trend of steady expansion of existing intervention centres and establishment of new ones will reduce the extent of geographical variation in future.