What condition results from hyperviscosity syndrome?

The condition that results from hyperviscosity syndrome is characterized by an increase in the thickness and stickiness of the blood, which can lead to several physiological consequences. When blood becomes hyperviscous, it can impair microcirculation, where the smallest blood vessels, such as capillaries, become less efficient at transporting blood.

This impaired microcirculation can cause lethargy and confusion as various tissues and organs receive insufficient blood flow and oxygen. The brain, for example, is particularly sensitive to changes in blood flow; thus, any reduction can lead to cognitive disturbances and feelings of fatigue or confusion.

While there can be an increased risk of thrombosis due to slower blood flow and increased cellular components in hyperviscosity syndrome, the primary and immediate effects revolve around reduced microcirculation, leading to symptoms like lethargy and confusion. Therefore, the correct choice highlights how hyperviscosity directly impacts the body's ability to maintain proper circulation at the microvascular level.