Hello,When twilight or light sedation is used you can be easily aroused, follow commands, and at times are responsive. Total iv anesthesia (TIVA) is often used interchangeably with twilight sedation, though it is different. TIVA is general anesthesia that is given only with iv medication, and while you continue to breathe on your own you are not easily arousable and do not have consciousness during the procedure. Total iv anesthesia does not provide pain relief from surgery and is used in conjunction with local anesthetics during the procedure.It is key that the anesthesiologist performing the TIVA is qualified and experienced. I have worked with both ends of the spectrum and TIVA done by a well trained anesthesiologist can be used safely and comfortably for a full TT, breast lift and implants. I perform most of my cosmetic cases in our office operating room under TIVA with the help of an excellent anesthesiologist and have not hand any major issues. If you have already met with a plastic surgeon and discussed the above procedures be sure to ask more about the details of the anesthesia so that your concerns can be put to rest.Best of Luck!Dr. Rednam