JOURNAL ARTICLE

Hospitalisation for heart failure and mortality associated with dipeptidyl peptidase 4 (DPP-4) inhibitor use in an unselected population of subjects with type 2 diabetes: a nested case-control study

Carlo B Giorda, Roberta Picariello, Barbara Tartaglino, Lisa Marafetti, Fabiana Di Noi, Annalisa Alessiato, Giuseppe Costa, Roberto Gnavi
BMJ Open 2015, 5 (6): e007959
26048211

OBJECTIVE: The SAVOR TIMI-53 study reported a significant increase in the risk of hospitalisation for heart failure (HF) in patients treated with a DPP-4 inhibitor (DPP-4i) in comparison with placebo. A recent case-control study in part confirmed this risk signal. Our aim was to compare the occurrence of HF in relation to DPP-4i use versus any antidiabetic treatment.

DESIGN: Population-based matched case-control study conducted using administrative data.

SETTING: The Italian Region of Piedmont (4.4 million inhabitants).

PARTICIPANTS: From a database of 282,000 patients treated with antidiabetic drugs, we identified 14,613 hospitalisations for HF, 7212 incident cases, and 1727 hospital re-admissions between 2008 and 2012; each case was matched for gender, age and antidiabetic therapy with 10 controls; cases and controls were compared for exposure to DPP-4i.

OUTCOME MEASURES: ORs and 95% CIs were calculated by fitting a conditional logistic model. All analyses were adjusted for available risk factors for HF.

RESULTS: We found no increased risk of hospitalisation for HF associated with the use of DPP-4i (OR for admission for HF 1.00 (0.94 to 1.07), incident HF1.01 (0.92 to 1.11), recurrent HF 1.02 (0.84 to 1.22)). All-cause mortality was 6% lower in DPP-4i users (p<0.001), whereas insulin users showed an excess of risk for any type of hospital admission (19%) and death (20%) (p<0.001).

CONCLUSIONS: Our findings suggest that, in an unselected population of diabetic patients, the use of DPP-4i is not associated with an increased risk of HF. The favourable impact on all-cause mortality should be viewed with caution and also other explanations investigated.

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