Crasshopper how tired are you tonight? A thought crossed my mind about reactive hyperemia and hyperemia. I know it is a stretch, but I am curious! LOL!!!
...I am really pooped can barely keep the lids open.
I think no more than light commentary.
Nutshell, it wouldn't apply in this case.
As far as I recall reactive hyperemia does not occur in patients suffering from significant blood loss, unless the blood loss causes myocardial infarction or ischemia in an area of preexisting coronary artery stenosis. Reeva was a healthy 29 yo with no underlying coronary artery disease. Were she a 75 yo smoker maybe, but again this only involves a vascular territory and not the whole heart. So downstream from the area of blockage/stenosis at autopsy you find the area of infarction is ruddier from localized increased blood flow, local release of vasodilating factors like NitrousOxide help facilitate this.
A classic example of reactive hyperemia would be patient gets acute clot blocking femoral artery supplying your whole leg. (Acute emergency) The leg becomes pale and "cold". The cells of the vessels and muscle and tissues of the leg release vasodilating factors. The capillaries dilate in a futile attempt to improve flow. Clot busters/lytic agents are administered, like Drano, they dissolve the clot and blood flow is restored.
The blood fills all these dilated capillaries, including those below the skin, and Hypermia "Increased Blood" occurs, they are in effect wide open and flooded by the restored blood flow. The leg is then more red in appearance and can be warmer than normal as the dilated capillaries are holding more blood than they usually do.
As I stated in an earlier post, in Reeva, the loss of blood (volume) would have caused vasoconstriction of arteries to help maintain blood pressure & stem further blood loss EXCEPT the vessels spared to preferentially direct flow to the brain and heart.
Elsewhere in the body, the tissues normally supplied by the vasoconstricted arteries do release those same vasodilating factors widening the capillaries. HOWEVER as the blood flow was never restored to normal, you don't get reactive hyperemia.
...ok now I'm really tired
what are you thinking?
If I don't answer it's because I can only think about boyfriend Jeans vs Skinny Jeans and which ones would better hide light from a pesky LED.
Funny the things in this trial that keep you up at night.