SIENA – Italian race car champion-turned-Paralympic gold medalist Alex Zanardi remained in serious condition a day after crashing his handbike into a truck and smashing his face.Zanardi was hooked up to an artificial ventilator and had “stable” blood flow while his neurological status “remains serious,” the Santa Maria alle Scotte hospital in Siena said Saturday in a medical bulletin.“The condition of Alex Zanardi is serious but stable,” surgeon Giuseppe Olivieri said in a briefing outside the hospital. “He arrived here with major facial cranial trauma -- a smashed face.”“The numbers are good, although it remains a very serious situation,” Olivieri added.Zanardi was transported by helicopter to the hospital after crashing near the Tuscan.