As a result of the continued trend of lower procedure volume and pricing pressure in the US, the company's share in the defibrillator market dropped by 100 basis points compared to the year-ago period. The US defibrillator market remains an overhang for Boston Scientific and its peers, St Jude Medical ( STJ ) and Medtronic ( MDT ).The drug eluting stent ('DES') business in the US witnessed challenges due to pricing pressure, lower procedural volume, lower penetration rates and share losses from the launch of Medtronic's Resolute Integrity stent with April being affected the most.