ALB and polyarteritis nodosa: Plasma exchanges are indicated in combination with treatment with corticosteroids and immunosuppressants or immunomodulators in cases of polyarteritis nodosa (PAN) linked to HBV, according to the following regimen: exchange of 60 ml/kg of plasma during each session with substitution by albumin at 4% or 5%, 3–4 times per week for 3 weeks, then progressively tapering off (three times per week for 1–2 weeks, then two times per week for 2 weeks).