** Shares of Park Medi World PRKM.NS drop 6.9% to 150.88 rupees in their trading debut
** Hospital chain operator opened 2% lower at 158.8 rupees on the National Stock Exchange of India, giving it a valuation of 68.59 billion rupees ($759 million)
** PRKM's 9.2 billion rupee IPO was subscribed 8x, with institutional investors leading demand
** Co to use majority of net IPO proceeds of 7.1 billion rupees to clear outstanding borrowings and pursue acquisitions
($1 = 90.3530 Indian rupees)
(Reporting by Nandan Mandayam in Bengaluru)
((Nandan.Mandayam@thomsonreuters.com; Mobile: +91 9591011727;))