Patient Characteristics and Outcomes of Hospitalized Chronic Kidney Disease Patients with and without Type 2 Diabetes Mellitus: Observations from the German Claims Data-Based Cohort of the CaReMe-CKD Multinational Study

Abstract

Johannes Leiner,1,2 Vincent Pellissier,2 Sebastian König,1,2 Lars Stellmacher,2 Sven Hohenstein,2 Carolin Schanner,2 Stefan Kwast,2 Ralf Kuhlen,3,4 Andreas Bollmann1– 3 1Department of Electrophysiology, Heart Center Leipzig at University of Leipzig, Leipzig, Saxony, Germany; 2Real World Evidence and Health Technology Assessment, Helios Health Institute, Berlin, Germany; 3Helios Health Institute, Berlin, Germany; 4Helios Health, Berlin, GermanyCorrespondence: Johannes Leiner, Heart Centre Leipzig at University of Leipzig, Department of Electrophysiology, Struempellstrasse 39, Leipzig, 04289, Germany, Tel [phone], Email [email protected]: Type 2 diabetes mellitus (T2DM) is a leading cause of chronic kidney disease (CKD) globally. Both conditions substantially worsen patients’ prognosis. Current data on German in-hospital CKD cohorts are scarce. The multinational CaReMe study was initiated to evaluate the current epidemiology and healthcare burden of cardiovascular, renal and metabolic diseases. In this substudy, we share real-world data on CKD inpatients stratified for coexisting T2DM derived from a large German hospital network.Methods: This study used administrative data of inpatient cases from 89 Helios hospitals from 01/01/2016 to 28/02/2022. Data were extracted from ICD-10-encoded discharge diagnoses and OPS-encoded procedures. The first case meeting a previously developed CKD definition (defined by ICD-10- and OPS-codes) was considered the index case for a particular patient. Subsequent hospitalizations were analysed for readmission statistics. Patient characteristics and pre-defined endpoints were stratified for T2DM at index case.Results: In total, 48,011 patients with CKD were included in the present analysis (mean age ± standard deviation, 73.8 ± 13.1 years; female, 44%) of whom 47.9% had co-existing T2DM. Patients with T2DM were older (75 ± 10.6 vs 72.7 ± 14.9 years, p < 0.001), but gender distribution was similar to patients without T2DM. The burden of cardiovascular disease was increased in patients with T2DM, and index and follow-up in-hospital mortality rates were higher. Non-T2DM patients were characterised by more advanced CKD at baseline. Patients with T2DM had consistently higher readmission numbers for all events of interest, except for readmissions due to kidney failure/dialysis, which were more common in non-T2DM patients.Conclusion: In this study, we present recent data on hospitalized patients with CKD in Germany. In this CKD cohort, nearly half had T2DM, which substantially affected cardiovascular disease burden, rehospitalization frequency and mortality. Interestingly, non-diabetic patients had more advanced underlying renal disease, which affected renal outcomes. Keywords: chronic kidney disease, type 2 diabetes mellitus, administrative data, in-hospital mortality, kidney failure, rehospitalization

Keywords

• chronic kidney disease
• type 2 diabetes mellitus
• administrative data
• in-hospital mortality
• kidney failure
• rehospitalization