TY - JOUR
T1 - Decreased haptoglobin levels inversely correlated with pulmonary artery pressure in patients with pulmonary arterial hypertension
AU - Nakamura, Hiroyuki
AU - Kato, Masaru
AU - Nakaya, Toshitaka
AU - Kono, Michihiro
AU - Tanimura, Shun
AU - Sato, Takahiro
AU - Fujieda, Yuichiro
AU - Oku, Kenji
AU - Ohira, Hiroshi
AU - Bohgaki, Toshiyuki
AU - Yasuda, Shinsuke
AU - Tsujino, Ichizo
AU - Nishimura, Masaharu
AU - Atsumi, Tatsuya
N1 - Publisher Copyright:
Copyright © 2017 the Author(s). Published by Wolters Kluwer Health, Inc.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - We investigated the serum haptoglobin levels in patients with pulmonary arterial hypertension (PAH) based on the hypothesis that haptoglobin levels would reflect subclinical hemolysis due to microangiopathy in pulmonary arterioles. This cross-sectional study included 3 groups of patients attending Hokkaido University Hospital: PAH, chronic thromboembolic pulmonary hypertension (CTEPH), and connective tissue diseases (CTD) without PAH (CTD-non-PAH) group. Serum haptoglobin levels were measured by standardized turbidimetric immunoassay in all patients. Demographic data, laboratory results, right heart catheter, and echocardiographic findings were extracted from the medical records. Decreased haptoglobin levels were defined as below 19mg/dL based on the 95th percentile of healthy controls. Thirty-five patients in PAH group including 11 with idiopathic PAH (IPAH) and 24 with CTD-associated PAH (CTD-PAH), 27 in CTEPH group, and 32 in CTD-non-PAH group were analyzed. Serum haptoglobin levels in PAH group (median 66mg/dL) were significantly lower than those in CTEPH group (median 94mg/dL, P=.03) and CTD-non-PAH group (median 79mg/dL, P=.03). The prevalence of decreased haptoglobin levels was 26% in PAH group, 15% in CTEPH group, and 6% in CTD-non-PAH group. Serum haptoglobin levels had a significant negative correlation (r=-0.66, P<.001) with mean pulmonary artery pressure in PAH group, particularly in CTD-PAH subgroup (r=-0.74, P<.001), but no correlation in IPAH subgroup (r=-0.52, P=.13) and in CTEPH group (r=-0.17, P=.41). Follow-up cases of CTD-PAH showed lowering pulmonary artery pressure led to normalizing serum haptoglobin levels. Serum haptoglobin levels decreased in PAH patients and inversely correlated with pulmonary artery pressure in CTD-PAH patients, suggesting their potential as a surrogate marker for CTD-PAH.
AB - We investigated the serum haptoglobin levels in patients with pulmonary arterial hypertension (PAH) based on the hypothesis that haptoglobin levels would reflect subclinical hemolysis due to microangiopathy in pulmonary arterioles. This cross-sectional study included 3 groups of patients attending Hokkaido University Hospital: PAH, chronic thromboembolic pulmonary hypertension (CTEPH), and connective tissue diseases (CTD) without PAH (CTD-non-PAH) group. Serum haptoglobin levels were measured by standardized turbidimetric immunoassay in all patients. Demographic data, laboratory results, right heart catheter, and echocardiographic findings were extracted from the medical records. Decreased haptoglobin levels were defined as below 19mg/dL based on the 95th percentile of healthy controls. Thirty-five patients in PAH group including 11 with idiopathic PAH (IPAH) and 24 with CTD-associated PAH (CTD-PAH), 27 in CTEPH group, and 32 in CTD-non-PAH group were analyzed. Serum haptoglobin levels in PAH group (median 66mg/dL) were significantly lower than those in CTEPH group (median 94mg/dL, P=.03) and CTD-non-PAH group (median 79mg/dL, P=.03). The prevalence of decreased haptoglobin levels was 26% in PAH group, 15% in CTEPH group, and 6% in CTD-non-PAH group. Serum haptoglobin levels had a significant negative correlation (r=-0.66, P<.001) with mean pulmonary artery pressure in PAH group, particularly in CTD-PAH subgroup (r=-0.74, P<.001), but no correlation in IPAH subgroup (r=-0.52, P=.13) and in CTEPH group (r=-0.17, P=.41). Follow-up cases of CTD-PAH showed lowering pulmonary artery pressure led to normalizing serum haptoglobin levels. Serum haptoglobin levels decreased in PAH patients and inversely correlated with pulmonary artery pressure in CTD-PAH patients, suggesting their potential as a surrogate marker for CTD-PAH.
KW - connective tissues diseases
KW - haptoglobin
KW - microangiopathy
KW - pulmonary arterial hypertension
UR - http://www.scopus.com/inward/record.url?scp=85032645584&partnerID=8YFLogxK
U2 - 10.1097/MD.0000000000008349
DO - 10.1097/MD.0000000000008349
M3 - 学術論文
C2 - 29069014
AN - SCOPUS:85032645584
SN - 0025-7974
VL - 96
JO - Medicine
JF - Medicine
IS - 43
M1 - e8349
ER -