RT Journal Article
SR Electronic
T1 Characteristics and Outcomes of Patients with Systemic Lupus Erythematosus–associated Thrombotic Microangiopathy, and Their Acquired ADAMTS13 Inhibitor Profiles
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 1549
OP 1556
DO 10.3899/jrheum.170811
VO 45
IS 11
A1 Cai Yue
A1 Jian Su
A1 Ruitong Gao
A1 Yubing Wen
A1 Chao Li
A1 Gang Chen
A1 Xuan Zhang
A1 Xuemei Li
YR 2018
UL http://www.jrheum.org/content/45/11/1549.abstract
AB Objective. To investigate the characteristics and outcomes of patients with systemic lupus erythematosus (SLE)–associated thrombotic microangiopathy (TMA) based on their ADAMTS13 inhibitor profiles.Methods. The medical data of 31 SLE patients with clinically diagnosed TMA were analyzed. ADAMTS13 activity and ADAMTS13 inhibitor were measured in all patients.Results. TMA was attributable to active SLE in 19 patients. ADAMTS13 inhibitor and severe ADAMTS13 deficiency were detected in 6 of them. Patients with ADAMTS13 inhibitor (n = 6) exhibited a lower platelet count (7.3 ± 5.1 vs 25.0 ± 17.8 × 109/l, p = 0.005) and more prevalent central nervous system (CNS) involvement (100.0% vs 23.1%, p = 0.003) than patients without ADAMTS13 inhibitor (n = 13). Patients with ADAMTS13 inhibitor also had mild renal involvement characterized by a higher estimated glomerular filtration rate (112.7 ± 18.0 vs 21.6 ± 12.0, p < 0.001), lower proteinuria level [0.6 (0.2–2.5) vs 8.1 (5.2–14.0) g/d, p = 0.011], and lower mean arterial pressure (95.3 ± 13.6 vs 117.5 ± 13.1 mmHg, p = 0.008) than was observed in patients without ADAMTS13 inhibitor. All patients with ADAMTS13 inhibitor achieved complete remission within 18.6 ± 8.7 days, while 3 patients (23.1%) without ADAMTS13 inhibitor achieved complete remission during a median followup of 5.0 months, even though more patients in this group received therapeutic apheresis (100.0% vs 50.0%, p = 0.021). The chance of complete remission increased by 10.8-fold (HR 10.8, 95% CI 1.8–65.5, p < 0.001) when ADAMTS13 inhibitor was present in SLE-associated TMA.Conclusion. Acquired ADAMTS13 deficiency is associated with more severe thrombocytopenia and CNS involvement, mild renal involvement, rapid resolution, and relatively good treatment response in SLE-associated TMA.