Abstract
Background
Hemoglobin levels usually decline before dialysis initiation. The influence of overhydration on anemia progression and iron sequestration is poorly documented. Furthermore, clinical implications of anemia at dialysis initiation remain to be elucidated.
Methods
This multicenter retrospective cohort study enrolled incident dialysis patients. The patients were stratified by tertiles of overhydration rate (OH-R) defined by (BW − DW)/DW*100 (BW: body weight just before dialysis initiation, DW: dry weight). Time courses (6 months before, to 1 month after, dialysis initiation) of hemoglobin, C-reactive protein (CRP), and iron sequestration index (ISI) were examined using mixed effects models. We used Cox models to identify anemia parameters predicting subsequent cardiovascular disease (CVD).
Results
Among the 905 enrolled patients, hemoglobin levels gradually decreased before dialysis initiation and rapidly increased thereafter. An inverse V-shaped time course was observed for CRP and ISI with an increase during dialysis initiation. Patients with a higher OH-R showed lower hemoglobin levels along with higher CRP and ISI levels before dialysis initiation. Mean corpuscular hemoglobin concentration (MCHC) was more stable before dialysis initiation than were mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH). Low MCHC (< 32 g/dL) was independently associated with the incidence of nonatherosclerotic CVD. Patients with low MCHC tended to have increased left ventricular wall thickness and left atrial diameter.
Conclusions
Progression of anemia before dialysis among overhydrated patients may mainly occur through hemodilution and iron sequestration partly induced by inflammation. Low MCHC reflects left atrial overload and left ventricular hypertrophy and hence may predict nonatherosclerotic CVD.
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Acknowledgements
We thank Dr. Shihomi Maeda, Dr. Fumiyuki Morioka, Dr. Syou Matsui, Dr. Sayaka Katou, Dr. Akane Ito, Dr. Eriko Iwahashi, (JCHO Osaka Hospital), Dr. Kiyoshi Shozu (Aino Hospital), Dr. Yutaro Azuma (Azuma Dialysis Clinic), Dr. Akira Wada (Azuma Renal Clinic), Dr. Jong Il Kim (Chibune Kidney and Dialysis Clinic), Dr. Sachiko Yamada (Saiseikai Ibaraki Hospital), Dr. Yasuhiro Enomoto (Enomoto Clinic), Dr. Ryoichi Miyazaki (Fujita Memorial Hospital), Dr. Yuji Murata (Harbor-Town Clinic), Dr. Toshiaki Hirabayashi (Heimeikai Clinic), Dr. Isao Fukuhara (Heisei Urologic Clinic), Dr. Shigeru Yamaguchi (Hokusetsu General Hospital), Dr. Takashi Tomokuni (Ibaraki Iseikai Hospital), Dr. Toyohumi Fukuda (Ibuki Clinic), Dr. Kazuyuki Hayashi (Ikeda Municipal Hospital), Dr. Nobuyuki Imai (Imai Naika Clinic), Dr. Yasuji Kuroda (Inadera Dialysis Clinic), Dr. Yuko Fujiwara, Dr. Yoshihiro Tsujimoto (Inoue Hospital), Dr. Takahisa Hotta (Iseikai Fuzoku Clinic), Dr. Takahiro Fujii (Itami Bara Clinic), Dr. Tomoko Yokokawa (Itami Gardens Clinic), Dr. Kazuo Yasuda (Jinyuukai Yasuda Clinic), Dr. Masanori Joko (Joko Clinic), Dr. Yukiomi Namba (Jouto Iseikai Clinic), Dr. Jyunya Takahara (Takahara Clinic), Dr. Mayumi Sakurai (Jyurakukai Clinic), Dr. Masato Baden (Kaiseikai Takarazuka Hospital), Dr. Hisato Nakamori (Katano Hospital), Dr. Hironori Kawamura (Kawamura Clinic), Dr. Chikako Monden (Kisei Hospital), Dr. Ken Kishida (Kishida Clinic), Dr. Eikun Maruyama (Kitagawa Clinic), Dr. Fumi Sato (KKR Otemae Hospital), Dr. Shigeru Hanada (Koseikai Taisei Clinic), Dr. Akihisa Kuki (Kuki Clinic), Dr. Takayuki Okamoto (Kyoritsu Hospital), Dr. Mitsuru Kubo (Kyowakai Hospital), Dr. Haruki Fuse (Maizuru Kyosai Hospital), Dr. Yutaka Matsui (Matsui Dietary & Dementia Clinic), Dr. Noriko Mikami (Mikami Clinic), Dr. Hiroshi Miyao (Miyo Urology Clinic), Dr. Mutsuko Mori (Mori Clinic), Dr. Rumi Sakai (Motoyama Sakai Rumi Clinic), Dr. Shunro Agata (Nagahara Hospital), Dr. Takanori Nagai (Nagai Clinic), Dr. Hideyuki Nakagawa (Nakagawa Clinic), Dr. Masashi Shinozaki (Nakano Clinic), Dr. Yasuo Ohyama (Neyagawa Keijinkai Clinic), Dr. Kanji Nozaki (Nozaki Clinic), Dr. Tetsuya Kaneko (NTT West Osaka Hospital), Dr. Takeshi Omichi (Ohmichi Clinic), Dr. Motohiro Okamura (Okamuraiin Jin Clinic), Dr. Akira Okasho (Okasho Urology Clinic), Dr. Kiyoshi Goto (Ono-Naika Clinic), Dr. Hidekazu Shimizu (Onoyama Clinic), Dr. Masahiro Kyo (Osaka Umeda Iseikai Dialysis Clinic), Dr. Nobuhiko Narukawa (Sakuragaoka Hospital), Dr. Kei Hirai (Sanko Clinic), Dr. Kazuhisa Yamamoto (Sanko hospital), Dr. Satoshi Sasaki (Sasaki Medical Clinic), Dr. Masugi Satoh (Satoh Clinic Kuzuha), Dr. Daisuke Nakagawa (Second Rokushima Clinic), Dr. Hiroyuki Araki (Settsu Iseikai Hospital), Dr. Shintaro Yamanaka (Shingu Municipal Medical Center), Dr. Atsushi Yokota (Shin-Osaka Iseikai Clinic), Dr. Ken Takahara (Sone Hospital), Dr. Zenzo Fujii (St. Hill Hospital), Dr. Jun Matsuda (Suita City Hospital), Dr. Yoshinori Sai (Suminodo Clinic), Dr. Kanji Yoshida (Suzawa Clinic), Dr. Tadashi Hatayama (Neyagawaikunobyouinn), Dr. Yukito Kokado, Dr. Tohru Takahashi (Takahashi Clinic), Dr. Kazuyuki Takahashi (Takahashi Kazuyuki Clinic), Dr. Yoshiaki Hirosue (Takasago Municipal Hospital), Dr. K.Y. (Tanaka Clinic), Dr. Masatou Tanaka (Tanaka Urology Clinic Dialysis Center Furuedai), Dr. Hiroko Tokizane (Tokizane Clinic), Dr. Keiji Isshiki (Tomita Clinic), Dr. Jun Tomita (Toyonaka Watanabe Clinic, Kansai Medical Hospital), Dr. Yumiko Honda (Toyonakamidorigaoka Hospital), Dr. Takahide Sugiyama (Tsukuno Fujii Clinic), Dr. Akira Moriguchi (Umeda-Higashi Blood Purification Clinic), Dr. Takatoshi Yamamoto (Yamamoto Clinic), Dr. Masaru Shin (Yao Tokushukai General Hospital), and Dr. Toru Yoshie (Yoshie Hospital) for their assistance in collecting data.
Funding
This study was supported by Osaka Heart Club. Funders had no role in analysis and interpretation of the data or approval of the manuscript.
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SY, TH, YD, TO, YS, AS, and YI contributed to the study design. All authors were involved in data acquisition and interpretation of the results. Data analysis was done by SY. Supervision was done by TH and YI. SY and TH drafted the report, and the other authors gave critical revision of the manuscript for scientific and factual content.
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Ethical statement
We enrolled patients with CKD stage 5 who started hemodialysis from January 2008 to December 2016 at Osaka University Hospital or from January 2007 to July 2018 at the Japan Community Health care Organization (JCHO) Osaka Hospital. We excluded patients aged < 20 years and those who started dialysis at the intensive care unit of Osaka University Hospital. This study was approved by the Osaka University Hospital Ethics Committee (No. 18026) and was performed according to the tenets of the Helsinki Declaration.
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Yamaguchi, S., Hamano, T., Oka, T. et al. Mean corpuscular hemoglobin concentration: an anemia parameter predicting cardiovascular disease in incident dialysis patients. J Nephrol 35, 535–544 (2022). https://doi.org/10.1007/s40620-021-01107-w
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DOI: https://doi.org/10.1007/s40620-021-01107-w