NATICK, Massachusetts ( TheStreet) -- Boston Scientific ( BSX) shares slipped Thursday after reporting a 25% drop in third-quarter profit. The maker of heart-devices, the second biggest behind Medtronic ( MDT), said sales of the cardiac rhythm management devices fell to $503 million in the quarter, down from $550 million a year earlier. Overall revenue fell 2% to $1.87 billion. Adjusted profit in the quarter was $223 million, or 15 cents a share, above analysts' estimates. Net earnings fell to $142 million, or 9 cents a share, from $190 million, or 12 cents, a year earlier. Looking ahead, Boston Scientific said it expects 2011 earnings excluding items of 67 cents to 70 cents a share. Previous guidance called for earnings of 64 cents to 70 cents a share. Analysts are expecting 45 cents. Sales are expected at $7.62 billion to $7.72 billion for 2011, the company said. Analysts forecast revenue of $7.77 billion. Shares of Boston Scientific were down 3.9%, or 23 cents, to $5.42 in trading Thursday afternoon. The stock fell as much as 6% earlier in the day. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.