Fainting after BBL: Are there reasons beyond the "normal" or common surgical reasons this is occurring with this procedure?

In a BBL we do very aggressive liposuction to many areas of the body. This is not a  natural process. There is a large fluid shift with the liposuction. After a large fluid shift you can feel lightheaded when going from sitting to standing. You can also feel lightheaded when taking a hot shower as the heat causes your blood vessels to dilate or get larger. I also find that patients become lightheaded when taking the very tight garment off for the first time.