A patient with erythrocytosis may develop symptoms of hyperviscosity.


Central neurologic changes:

(1) headache

(2) depressed mentation, slow thinking

(3) faintness, dizziness, lightheadedness

(4) fatigue or lethargy


Changes in vision and/or hearing:

(1) blurred vision

(2) amaurosis fugax

(3) tinnitus


Peripheral findings:

(1) paresthesias

(2) myalgia

(3) muscle weakness

(4) chest and/or abdominal pain


A patient with erythrocytosis and one or more of these findings should be evaluated for hyperviscosity.


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