I think it depends on how you position it on your resume. Do you list the degree as PGDBM on your resume? US b-schools will ask you to find an equivalent...Masters in Business? If you are otherwise a solid candidate for the schools you are interested in....I don't think your PGDBM degree will cause you any problems.
When I applied to Sloan I already had a one-year Master in Innovation Management. Basically it was like a mini-MBA but I don't think the Adcom batted an eye - in any event, it was never brought up to me in my interview.
As my mentor always said, the problems you need to worry about are not the ones you plan on having. The biggest road bumps candidates run up against are having lackluster essays and targeting the wrong MBA programs.