In the early postperative period after ANY surgery, it is not uncommon for patients to experience weight gain.
This is the body's natural response to injury or trauma which causes inflammation. The inflammation makes our blood vessels "leak" and the surrounding tissues soak up the leaky fluid like a sponge. After several days and usually by 7-10 days the vessels reabsorb the fluid and it is eliminated in the form of urine.
Swelling may persist in the treated areas for several weeks to months.
With Vaser, we intentionally "pump" the body up with fluid which makes removal of fat via liposuction more efficient. The body typically requires twice the volume of fluid to replace the fat that was removed. This administered fluid as well as the fluid subseqeuntly taken over the following 48-72 hours after surgery accounts for much of the weight gain.
The more fat that is removed, the more the weight gain. Eventually the body returns to normal and your baseline weight should reflect the fat that was removed if all other facotrs are stable.
I hope this helps.