POEMS syndrome is a rare multi-systemic plasma cell disorder characterized by polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, and skin changes [1]. Pulmonary arterial hypertension (PAH) is one of rare manifestations of POEMS syndrome [1, 2], and steroid therapy is effective in treating POEMS syndrome-associated PAH [3–5]. However, because there is a risk of dosedependent steroid intolerance or insufficient effectiveness in treating POEMS syndrome-associated PAH [5, 6], alternative or adjunctive therapy should be evaluated. In this report, we showed a rare case of POMES syndromeassociated PAH which was successfully treated with sildenafil and relatively low dose of prednisolone. The severity of PAH and effectiveness of therapy were definitively evaluated with right heart catheterization. A 55-year-old man started to suffer from difficulty in walking, and edema in lower extremities from October 2005. He was diagnosed as POEMS syndrome in March 2007 because he met both of 2 major criteria (polyneuropathy and IgG-lambda type monoclonal protein) and 6 of 7 minor criteria (Castleman’s disease, splenomegaly, edema in lower extremities, hypothyroidism, hyperpigmentation, and papilledema) of POEMS syndrome [1]. The vascular endothelial growth factor (VEGF) level was 6630 pg/mL at the time of diagnosis. After improvements of his symptoms with steroid pulse therapy, he was followed up regularly as an outpatient without steroid. Despite relatively low VEGF level of 275 pg/mL, dyspnea and edema in lower extremities exacerbated and transthoracic echocardiography newly revealed possible pulmonary hypertension. He was referred to our institution. This case has also been reported elsewhere from another point of view [7]. PAH was confirmed by right heart catheterization as shown in Table 1. There were no other apparent secondary causes of pulmonary hypertension based on the World Health Organization updated clinical classification of pulmonary hypertension. After recovery from previously reported pulmonary edema [7], sildenafil was started at 20 mg/day and the dose was increased gradually to 60 mg/ day which resulted in improvement of plasma brain natriuretic peptide (BNP) level from 276 to 112 pg/mL [8]. At this point, oral prednisolone (0.4 mg/kg/day) and 2 cycles of intravenous dexamethasone (0.8 mg/kg 9 4 days) administration were added because exacerbation of POEMS syndrome was suspected with accumulation of pericardial effusion. Eventually, 100 mg/day of sildenafil and 0.4 mg/ kg/day of prednisolone administration resulted in dramatic improvement of PAH confirmed by many indexes including right heart catheterization about 3 months after the initiation of sildenafil (Table 1). Until now, steroid therapy has been believed as firstline therapy in treating POEMS syndrome-associated PAH and 1 mg/kg/day prednisolone administration may be We have to inform you that this case has also been reported in Annals of Hematology from another point of view [7]. Especially, laboratory data and part of right heart catheterization findings before the treatment in Table 1 are reproductions from it. However, the concept of this case report is totally different from the other one, and we got reproduction permission from Springer for this submission.
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