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Cerebral infarction in acute anemia.

Chung-Fen Tsai¹, Ping-Keung Yip, Chao-Ching Chen

¹Department of Neurology, Cardinal Tien Hospital, Taipei, Taiwan.

Journal of Neurology

|July 17, 2010

Summary

Acute anemia from significant blood loss can cause cerebral infarction (stroke), particularly in border zones. This occurs when hemoglobin drops critically, reducing oxygen supply to the brain, especially with existing intracranial stenosis.

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Area of Science:

Neurology
Hematology
Vascular Medicine

Background:

Limited research exists on the link between cerebral infarction and acute anemia.
Acute anemia due to substantial blood loss presents a unique challenge in understanding stroke etiology.
Systemic hypotension was excluded to isolate the effects of anemia on cerebral infarction.

Purpose of the Study:

To investigate the nature and potential mechanisms of cerebral infarction in patients with acute anemia caused by marked blood loss.
To analyze clinical characteristics and neuroimaging findings in this specific patient cohort.
To clarify the relationship between severe anemia and ischemic stroke.

Main Methods:

Retrospective review of 12 patients diagnosed with acute cerebral infarction and anemia from marked blood loss between 2001 and 2009.
Detailed analysis of clinical data, including hemoglobin levels and neuroimaging results.
Vascular studies (extracranial and intracranial) were performed in a subset of patients.

Main Results:

All 12 patients experienced borderzone infarction, with six showing unilateral and six bilateral patterns.
The mean hemoglobin level at the time of infarction was 5.8 g/dl, representing a 46% reduction from baseline.
Six of nine patients with vascular studies had intracranial stenosis, while none had severe carotid stenosis.

Conclusions:

Acute anemia, particularly when hemoglobin levels fall critically, can lead to cerebral blood flow insufficiency and ischemic injury.
Borderzone infarcts are characteristic findings in cerebral infarction associated with acute anemia due to blood loss.
Intracranial stenosis may exacerbate the risk of cerebral infarction in anemic patients by compromising cerebral perfusion.