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JOURNAL ARTICLE

Statin use in patients with nephrotic syndrome is associated with a lower risk of venous thromboembolism

Mohammad Resh, Bakhtawar K Mahmoodi, Gerjan J Navis, Nic J G M Veeger, Willem M Lijfering
Thrombosis Research 2011, 127 (5): 395-9
21277007

BACKGROUND: Nephrotic syndrome (NS) is a well-known risk factor for venous thromboembolism (VTE), however preventive measures are not routinely taken. In non-renal populations, statins are associated with lower risk of VTE. Hence, we set up this single-center retrospective cohort study to assess whether statin use influenced VTE risk in NS subjects.

METHODS: We analyzed 289 consecutive patients with NS (defined by proteinuria ≥ 3.5 g/day) who were aged >18 years at the study entry and followed for at least 6 months. Use of statins and concomitant medication were determined.

RESULTS: Of patients with NS (59% men; mean age, 42 years), 48% used statins for at least 1 month during NS. Using univariate and time-dependent Cox regression analyses, hazard ratio for VTE in statin users versus non-users was 0.2 (95%CI, 0.1-0.7) and 0.6 (95% CI, 0.2 -2.0), respectively. Adjustments for potential confounders did not change outcomes. Three VTE events occurred in a total of 812 statin-years, corresponding to an annual incidence of 0.37% (95%CI, 0.12-1.15). In contrast, 17 VTE occurred in a total of 2106 patient-years without statin exposure, annual incidence 0.81% (95%CI, 0.50-1.30).

CONCLUSIONS: Although statistically significant, the hazard ratio of 0.2 for VTE risk in statin users versus non-users could have been biased, but the time-dependent hazard ratio of 0.6 was probably not. As the association was in the same direction for both analyses, we conclude that statin use is associated with a lower risk of VTE in patients with NS.

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