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関連する概念動画

Disorders of Erythrocytes01:27

Disorders of Erythrocytes

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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
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Erythropoiesis01:14

Erythropoiesis

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Red blood cells  (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia,...
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Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Lifecycle of Erythrocytes01:22

Lifecycle of Erythrocytes

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Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups....
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Database-guided Flow-cytometry for Evaluation of Bone Marrow Myeloid Cell Maturation
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[第511例: 輪状シデロブラストが増加した重度の貧血]

Z W Liu1, M Chen1, B Han1

  • 1Department of Hematology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China.

Zhonghua nei ke za zhi
|September 4, 2025
PubMed
まとめ

重度の貧血は当初 骨髄不全症候群と誤って診断されましたが 実はアルコールの誘発による sideroblastic 貧血でした ビタミンB6療法は 回復可能な原因を除外する必要性を強調して 状態を迅速に解決しました

科学分野:

  • 血液学
  • 内科 医学
  • 毒理学について

背景:

  • シドロブラスティック貧血 (SA) は,非有効な赤色素形成と赤色素前駆体における鉄の蓄積によって特徴づけられる疾患群である.
  • 環状 sideroblasts (MDS-RS) を伴う骨髄分裂症候群は,SAの一般的な原因であり,しばしばSF3B1のような体変異と関連しています.
  • アルコール 乱用 は 認め られ て いる が,時 に は 見過ごさ れ て いる SA の 回復 可能な 原因 です.

研究 の 目的:

  • 初期にMDS-RSと診断された重度の貧血が 最終的にアルコールによるSAと診断されました
  • SAを診断する際のアルコール摂取を含む 徹底した病歴の重要性を強調する.
  • 非クローン性SAの診断上の課題と治療への影響について議論する.

主な方法:

  • 骨髄の形状検査,SF3B1遺伝子検査,鉄代謝検査,肝臓のMRI検査など
  • MDS-RSと推定されるルスパテルセプトによる初期治療.
  • 重度のアルコールの摂取歴が確認された後,ビタミンB6の治療を行う.
  • ヘモグロビン値と臨床反応のモニタリング

主要な成果:

  • 患者は重度の貧血 (HGB 35 g/ L) と24%のリングシデロブラストで,当初はルスパテルセプトによるMDS- RSとして治療された.

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  • ルスパテルセプト投与10ヶ月後に再発した. 過去を振り返ると 大量のアルコールを摂取していたことが分かりました
  • ビタミンB6療法は,アルコール誘発性ASを確認した,迅速かつ持続的なヘモグロビン増加 (10日間で85g/ L, 1ヶ月で134g/ L) を引き起こした.
  • 肝臓のMRIでは,有意な鉄過負荷 (T2* 1.1 ms) が示されました.

    • 結論:

    • クローナルの証拠がない sideroblastic 貧血では,アルコール依存症のような可逆的な原因は,MDSに割り当てる前に除外されなければならない.
    • ルスパテルセプトは一時的な効能を示したが,非クローナルSAにおける根本的な病因を隠す可能性がある.
    • 肝臓の合併症を防ぐために,鉄過負荷を注意深くモニタリングし,鉄ケレーション治療を適時に行う必要があります.