High valuations don’t necessarily preclude further market-beating gains, but they do tend to drive more volatility, and I think Edwards Lifesciences ( EW ) is a case in point. While this company continues to log impressive growth for its size, the Street stillAnalyst’s Disclosure:I/we have no stock, option or similar derivative position in any of the companies mentioned, and no plans to initiate any such positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am ...