Equity benchmark Sensex surged over 180 points in early trade on Tuesday, as easing retail inflation triggered buying sentiment in the market. Besides, a firm trend on other Asian bourses also supported the uptick in domestic equities, brokers said. The 30-share Sensex was trading 186.98 points or 0.32 per cent higher at 58,364.74. Similarly, Nifty advanced 54.65 points or 0.31 per cent to 17,409.95 in initial deals.