The Sensex at the Bombay Stock Exchange lost over 84 points in early trade today, lost ground further in late morning deals and was trading 136 points in the negative territory at 15,891. After losing 157 points in yesterday's trade, the 30-share barometer fell further by 84 points in early trade today.In a similar fashion, the wide-based National Stock Exchange index Nifty was trading 39 points in the red at 4,821.