Boston Scientific Corp. swung to a loss in its first quarter, hurt by litigation costs and currency rate fluctuations.

The medical-device maker on Tuesday also said it would pay $119 million to settle nearly 3,000 product liability lawsuits and claims related to its transvaginal surgical mesh products. More than 25,000 claims or suits over the devices have been made against Boston Scientific, the company has said in regulatory filings.

Some patients and doctors alleged that the devices have caused them pain and discomfort. The company's profits also were hurt by higher costs related to acquisitions, restructuring and amortization.

Boston Scientific, based in Marlborough, Mass., cut its sales outlook for the year, now projecting $7.23 billion to $7.38 billion, down from its previous range of $7.3 billion to $7.5 billion. Adjusted per-share earnings are still expected to be 88 to 92 cents, the company said.

Analysts polled by Thomson Reuters projected 91 cents in per-share profit on $7.43 billion in revenue.

Shares of Boston Scientific, up 30% over the past year, fell 1.3% in morning trading.

Revenue slipped 0.3% to $1.77 billion, hurt in part by currency fluctuations that reduced sales by $117 million in the quarter. Adjusted for currency fluctuations, revenue rose 6%, the company said, driven by improved sales of its cardiovascular stents, which prop open diseased arteries, and implanted defibrillators, which treat irregular heartbeats. In both product categories, Boston Scientific competes against Medtronic PLC, St. Jude Medical and others.

Chief Executive Michael Mahoney said the company's sales were growing faster than the overall market in most of its business units.

"The important thing is [the] underlying health of the company," Mr. Mahoney said in an interview. "When you look at operational growth, the company grew 6%."

Mr. Mahoney said Boston Scientific continues to contest the remaining surgical mesh suits against the company, but would "settle cases at reasonable terms when appropriate."

For the current quarter, the company expects to book adjusted earnings of 20 cents to 22 cents a share on $1.8 billion to $1.85 billion in revenue. Analysts are forecasting 22 cents in per-share profit and $1.86 billion in sales.

Boston Scientific has embarked on significant cost-cutting plans over recent years and has moved to diversify its product portfolio to make it less dependent on sales of its cardiac devices. Stents and implantable heart-rhythm devices account for more than half of the company's sales, and both face growth challenges and high levels of competition that can pressure prices.

Last month, the company bought Endo International PLC's men's health business for $1.6 billion, a deal it expects to close in the third quarter. Meanwhile, the company won U.S. Food and Drug Administration approval in March for its controversial stroke-prevention Watchman device. The device, twice declined FDA approval, is an alternative to blood thinners and another move by the company to diversify.

At the same time, Boston Scientific has invested in expanding sales in emerging economies such as China, where a health-care overhaul has widened access to services and increased demand for pharmaceuticals and medical devices. Adjusted international sales rose 7% during the quarter, driven by a 6% gain in Europe and a 7% rise in the Asia, Middle East and Africa region. The company also said it entered into a partnership to accelerate physician training in China.

For the period ended March 31, Boston Scientific booked a loss of $1 million, down from a profit of $133 million a year earlier. On a per-share basis, the company broke even after reporting 10 cents in the year-earlier period. Excluding certain items such as acquisition and divesture-related charges and pension termination costs, per-share profit rose to 21 cents from 20 cents.

Boston Scientific had projected adjusted per-share earnings of 19 cents to 21 cents and revenue of $1.74 billion to $1.8 billion.

Write to Joseph Walker at joseph.walker@wsj.com and Lisa Beilfuss at lisa.beilfuss@wsj.com

(Correction: An earlier story misstated the change in Boston Scientific's revenue.)

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