As Jay Horowitz, CRNA, shopped for a new vital signs monitor, he'd often flash back to his old IBM 286 computer, a clunky relic with one floppy drive, a 40 MB hard disk and monochrome screen that still sits in his home: no longer useful or wanted, obsolete before its time, even though it's in good working order. He didn't want the same fate to befall the monitor he'd recommend to the Surgery and Endoscopy Center in Sebring, Fla. Especially because it will measure the oxygenation, ventilation, circulation and temperature of the first patients to receive general anesthesia at the two-OR facility about to add invasive plastics cases.