Sensex, which had opened higher at 73,183.10, climbed to an intraday high of 73,473.05. But unable to keep the momentum going, the 30-stock benchmark index shed its gains to touch a low of 72,365.67 in the later hours of the trading session. At close, the BSE Sensex had shed 454.25 points, or 0.62%, to close at 72,488.99.