In sickle cell crisis, which mechanism best explains the severe multi-site pain?

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Multiple Choice

In sickle cell crisis, which mechanism best explains the severe multi-site pain?

Vaso-occlusion in the microvasculature is the primary driver of the severe multi-site pain in a sickle cell crisis. When red blood cells containing hemoglobin S are deoxygenated, they polymerize, become rigid, and tend to adhere to the endothelium and to each other. This causes blockages in small vessels, reducing blood flow and oxygen delivery to multiple tissues. The resulting ischemia activates nociceptors and leads to intense pain that can occur across multiple sites simultaneously. Inflammation can accompany the crisis and worsen pain, but the root cause is the occlusion of blood vessels by the sickled cells. Mast cell degradation isn’t a central mechanism here, and infection may precipitate a crisis but does not explain the core cause of the widespread pain.

Vaso-occlusion in the microvasculature is the primary driver of the severe multi-site pain in a sickle cell crisis. When red blood cells containing hemoglobin S are deoxygenated, they polymerize, become rigid, and tend to adhere to the endothelium and to each other. This causes blockages in small vessels, reducing blood flow and oxygen delivery to multiple tissues. The resulting ischemia activates nociceptors and leads to intense pain that can occur across multiple sites simultaneously. Inflammation can accompany the crisis and worsen pain, but the root cause is the occlusion of blood vessels by the sickled cells. Mast cell degradation isn’t a central mechanism here, and infection may precipitate a crisis but does not explain the core cause of the widespread pain.

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