Objectives:

To analyze initial and follow-up features of patients with systemic lupus erythematosus (SLE) diagnosed during hospitalization.

Methods:

Retrospective analysis of medical records: two groups were studied, a) SLE diagnosed during hospitalization (SLEin), b) SLE diagnosed on an outpatient basis (SLEout). Results: 123 patients were assessed, 87% female, mean age at diagnosis was 34 years and 45 (37%) of them were SLEin. Patients in the SLEin group had a median of 144 days from the onset of symptoms to diagnosis of SLE vs. 287 days in the SLEout group (p = 0.04). Initially, SLEin had an average SLEDAI of 10 vs. 8 in SLEout (p = 0.004) and anti-dsDNA was positive in 71% vs. 53% in SLEout (p = 0.07). Within the first 6 months, the average cumulative glucocorticoid dose was 6493 mg in SLEin patients vs. 3563 mg in SLEout (p < 0.001) and immunosuppressant usage was higher in SLEin: 62% vs. 26% in SLEout (p<0.001). Within the first year, SLEin's kidney biopsies showed lupus nephritis III or IV in 31% vs. 12% in SLEout (p = 0.003, log-rank test). Within the first 2 years, 6 SLEin patients died vs. 1 SLEout patient (p = 0.02) and SLEin patients had more damage as measured by SLICC/ACR Damage Index (median 0, range 25%-75% 0-1 vs. median 0, range 25%-75% 0-0 in SLEout; p = 0.04).

Conclusions:

SLEin are initially more active, require higher doses of glucocorticoids and immunosuppressants, have more significant kidney involvement, and present more damage and greater mortality in the short term.

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