Lupus & antiphospholipid syndrome

Therapeutic Hydroxychloroquine Blood Levels Are Associated With Fewer Hospitalizations and Possible Reduction of Health Disparities in Lupus

Arthritis Care Res (Hoboken)Published Cohort study

Authors' conclusion

HCQ blood levels within 750 to 1,200 ng/mL are associated with lower rates of acute care in all patients with lupus, including groups with higher rates of acute care.

Study context

Population
Patients with lupus with hydroxychloroquine (HCQ) blood levels measured during routine lupus visits
Participants
181 patients39 acute care visits
Exposure
Therapeutic vs subtherapeutic or supratherapeutic HCQ blood levels
Outcome
Time to first lupus-related acute care visit (ED visits/hospitalizations)

Main finding

As reported in the abstract

Lupus-related acute care

Therapeutic HCQ blood levels associated with lower rates of acute care

66% lower

Observational data: associations, not effects.

Further findings

Higher rates of acute care in Black or Hispanic patients and those with public insurance
three to four times higher
Levels within 750 to 1,200 ng/mL associated with lower rates of acute care use in these subgroups
95% lower

Original publication

Therapeutic Hydroxychloroquine Blood Levels Are Associated With Fewer Hospitalizations and Possible Reduction of Health Disparities in Lupus. Arthritis Care Res (Hoboken). Published 1 October 2024. doi:10.1002/acr.25422

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